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2- 2- DRAFT EVALUATION AND EFFECTIVENESS OF 41 STORMWATER. MANAGEMENT PROGRAMS IN THE LITTLE MANATEE RIVER BASIN submitted to: THE FLORIDA DEPARTIV= OF ENVIRONMENIAL REGULATION OFFICE OF COASTAL ZONE MANAGEMENT Submitted by: TAMPA BAY REGIONAL PLANNING COUNCIL St. Petersburg, Florida Peter A. Clark, Principal Planner March 31, 1989 Financial assistance for this study was provided by a federal Coastal zone Management Grant administered by the Florida Department of Environmental Regulation GB 991 T3 F6 1989 DRAFT EVALUATION AND EFFECTIVENESS OF STCRH@ATER MANAGEMENT PROGRAMS IN THE LITTLE MANATEE RIVER BASIN Submitted to: THE FLORIDA DEPAR'IMENT OF ENVIROMWIAL REGULATION OFFICE OF COASTAL ZONE MANAGEMENT Submitted by: TAMPA BAY REGIONAL PLANNING COUNCIL St. Petersburg, Florida Peter A. Clark, Principal Planner March 31, 1989 F-inancial assistance for this study was provided by a federal Coastal Zone Management Grant administered by the Florida Department of Environmental Regulation TABLE OF CONTENTS TABLE OF CONTENTS LIST OF FIGURES LIST OF APPENDICES EXECUTIVE SUMMARY I. INTRODUCTION ii. FLORIDA DEPARTMENT OF ENVIRONMENTAL REGULATION III. SOUTHWEST FLORIDA WATER MANAGEMENT DISTRICT IV. TAMPA BAY REGIONAL PLANNING COUNCIL V. HILLSBOROUGH COUNTY Vi. STCRMWATER MANAGEMENT REOOt2MMTIONS Vii. SUMMARY LITERATURE CITED I. INTRODUCTION The Tampa Bay area is one of the fastest growing regions in the state. The impacts of this growth on the Tampa Bay estuarine system have been the subject of numerous scientific investigations and have triggered a variety of efforts aimed at controlling point sources of pollution, habitat destruction and other deleterious activities. However, it has become abundantly clear that if such efforts are to be successful, they must be better coordinated and must be conducted within a broader, basin-wide management perspective. They must also focus more clearly on controlling non-point source pollution, maintaining natural freshwater inflows to the estuary, and on integrating consideration of living resource management efforts in local and regional capital improvement programs, comprehensive plans, and other governing documents. Major obstacles confronting basin-wide management in the area include the size and complexity of drainage areas around the Bay, a lack of detailed information upon which to base needed policies and ordinances, and also the rapid urbanization of critical watersheds. For, maximum efficiency in using available funds and expertise, efforts must be directed at priority geographic areas and regulatory improvement needs. With this in mind, the Florida Department of Environmental Regulation, with funds from the federal Coastal Zone Management program (Office of Ocean and Coastal Resource Management, National oceanic and Atmospheric Actninistration), sought to develop a basin-wide analysis of the Little Manatee River. The program is expected to require a 2- to 3- year cooperative effort between federal, state, regional and local agencies to develop and implement comprehensive, basin-wide management policies for the Little Manatee River watershed. This grant is the first stage of the effort to examine stormwater regulations and management programs affecting the Little Manatee River basin. Project results are intended to lead to better "special area" management in local and state programs and to provide the basis for integrating local land use, environmental protection and stormwater management programs with the state-administered Cockroach Bay Aquatic Preserve and the Little Manatee River outstanding Florida Waters programs. The project will also serve as a prototype or model for similar efforts in other watersheds in the Tairpa Bay system toward the longer term goal of enhancing the overall health of Tampa Bay. The priority area of Tampa Bay selected for this project is the Little Manatee River watershed, located on the eastern side of the bay in Hillsborough and Manatee Counties (Figure 1). Little Cockroach Bay and the nearshore waters of Tampa Bay are also included in the study area. This area-is the last remaining major river of the Tampa Bay system in a relatively natural condition. Mangrove islands, tidal marshes, marine grassbeds and oyster bars.characterize the downstream estuarine portions. The headwaters of the system contain floodplain hardwoods, cypress swamps, and freshwater marshes. Portions of the Little Manatee River west of U.S. 301 are classified as 820 52' 820 30' 8 2- 03' 280 05' 28000' TAMPA OL D. rAMPA BAY % N goo @p .4LAFI-4 ST. PETERSBURG 0 Td 27045' - Stm%. rAMPA BA Y co Shell co Poin RIVER 41 P, ti 06, Flork, Power a Light A4A N A rEE 27030' GULF OF A4EX CO MANATEE CO NTY !@ARASOTA Co. EXPLANATION 0 IOMILES -@i -SI N' , - I BOUNDARY STUDY 0 1OKILOMETERS AREA 27016' 1 1 1 1 BASE FROM U.S. GEOLOGICAL SURVEY HYDROLOGIC MAP - 1974 STATE OF FLORIDA Figure 1. Location of the Little Manatee River basin (USGS, 1984). an Outstanding Florida Water and lie within the Cockroach Bay Aquatic Preserve. Although there has been considerable state, regional and local interest in the area, local government has not yet developed a ccaTprehensive management plan for the watershed, primarily due to a lack of funding and intergovernmental support. Land uses in the drainage basin are predominantly rural and agricultural, and while present uses possibly contribute pollutants to the system, primary concern is that the area lies directly in the path of future urban development. The recently-ccvpleted Interstate-75 highway provides a major transportation corridor for growth, and a large portion of the Little Manatee River watershed has recently received approval for zoning to higher densities and urban/suburban uses. Pressures to develop the area make it imperative that the drainage basin be managed as an ecological and hydrologic unit with particular emphasis on managing stormwater runoff from new development and maintaining natural flow regimes. It is important that a management framework be in place prior to actual development. The Tampa Bay Regional Planning Council has received support from the DER Coastal Zone Management program to undertake this analysis of the stormwater regulations and management programs affecting the Little Manatee River basin. Evaluation of stormwater management programs focuses upon: identifying existing regulations applicable to the study area; identifying strengths and weaknesses of existing policies, programs, and regulations for achieving basin management objectives; identifying opportunities for improving mutual support between state, regional and local programs affecting the basin; and providing preliminary recommendations for improving implementation of stormwater management regulations. In order to gain a working understanding of stormwater management requirements, the workscope for this undertaking includes a one on one interview with local stormwater regulators, with the intent to identify rec=nendations for improvements and implementation. Staf f of the TBRPC has met with the following individuals and representative organizations: � William (Bill) Kutash, Florida Department of Environmental Regulation � Victor A. Gagliardo, Southwest Florida Water Management District � William J. Veon, Jr., Hillsborough County - Planning and -Zoning Department � Stuart Santos, Environmental Protection Cmmission of Hillsborough County � Thamas Larkin, Manatee County Public Health Department 0 Robert Whinery, Manatee County Highway Department 0 Ronald Giovannelli, Florida Land Design and Engineering 0 Jacob Stowers, Pinellas County Each interviewee was requested to identify existing implementation strategies, to indicate any special requirements necessary for the study area, to describe stormwater controls which are not effective or problematic, and to offer any reccmmendations to improve storrrwater regulation. All individuals that were requested to participate provided significant first-hand information and recummendations which supports program objectives. The results of the interview program are tabulated into agency categories for ease in evaluation. Agency recmmendations in each category are selected from the personal interview process and are not the sole suggestion of the individual representing the agency. it should also be noted that very few special requirements exist for the Little Manatee River watershed, except for the areas affected by the Outstandimg Florida Waters designation, which is discussed in detail below. The results of the program are oriented as to also be applicable to other basins within the jurisdiction, or to be used as a nx)del for other agencies to implement. I. FLORIDA DEPARTMENT OF ENVIRONMENTAL REGULATION LTylementation-of Chapter 17-25, F.A.C. The Florida Water Resources Act of 1972 established the Florida Department of Environmental Regulation (FDER) as a resource protection and umbrella administering agency for water quality. Rapid urbanization with the associated land clearing and paving of previous surfaces has accelerated stormwater runoff problems in the last several decades. Recognition of runoff quality and quantity problems led Florida to begin drafting regulation to control stormwater in the late 19701s. In addition, Section 208 of the Clean Water Act (1975) required states to control nonpoint sources of pollution generated by such land uses as agriculture, silvaculture (forestry), mining, urban development and others. The FDER and twelve designated local agencies received financial support from Section 208 grants to evaluate Florida's stormwater problems and to develop technical and administrative methods of treatment and control. The initial focus of attention centered on urban stormwater needs, due to the local agencies receiving 208 grant support. The FDER took responsibility for investigating agriculture and forestry activities statewide, and the development of management strategies for controlling nonpoint sources of pollution (Livingston and Cox, 1985). The first official state regulation specifically addressing stormwater was adopted in 1979 as part of Chapter 17-4, Florida Adninistrative Code (F.A.C.). Initial rule implementation is best described by Livingston and Cox (1985) as follows: "Chapter 17-4.248 (F.A.C.) was the first attempt to regulate this source of pollution that, at the time, was not very well understood. Under Chapter 17-4.248 (F.A.C.) the Department based its decision to order a permit on a determination of the 'insignificance' or 'significance' of the stornwater discharge. This determination seems reasonable in concept; however, in practice such a decision can be a variable as the personalities involve. what may appear insignificant to the owner of a shopping center may actually be a significant pollutant load into an already overloaded stream." Concurrently, the Department began reviewing the results of research being conducted under the 208 program. The grant programs identified that stormwater discharges were responsible for over half of the pollution load entering Florida waters, while in many watersheds stormwater runoff accounted for all of the pollutant load. In addition, Livingston (1985) identified at the time that storrrwater associated pollution is responsible for: 1) 80 to 90 percent (%) of the heavy metals loading to Florida surface waters. 2) Virtually all of the sediment depositing in state waters. 3) 450 times the suspended solids going to receiving waters and nine times the load of biochemical oxygen demand (5 day) substances when compared to loads from secondarily treated sewage effluent. 4) Nutrient loads comparable to those in secondary treated sewage effluent discharges. In 1980 the FDER recognized water quality problems associated with stormwater runoff, especially urban sources, and began assimilating regulations for their control. After two years, more than 100 meetings and 29 official rule drafts for review and comment, the Stormwater Rule, Chapter 17-25, F.A.C. became effective on February 1, 1988. Since same water quantity regulation occurred prior to 1982, the overriding standards of Chapter 17-25 (F.A.C.) are the water quality standards and appropriate regulations established in other department rules (Livingston and Cox, 1985). In order to acquire a stormwater discharge permit, the applicant must provide reasonable assurance that storrrwater discharge will not violate state water quality standards (Chapter 17-4). Due to the quantity of potential applicants and receiving water bodies, FDER decided to establish a rule based upon performance standards of stormwater treatment facilities. The performance standard is a technology-based effluent limitation requirement that design of stormwater treatment facilities must achieve or better the required treatment level in order to be in compliance. The actual performance standard by rule is the retention or detention with filtration of the runoff from the first one inch of rainfall or the first one half inch of runoff for stormwater treatment facilities that serve a drainage area of 100 acres or less. The performance standard criteria was developed by considering several inherent properties of stormwater in Florida which include the annual storm frequency distribution and the first flush of pollutants. Rainfall records and distribution curves identify nearly 90% of a years storm events in Florida produce less than one inch of rainfall (Anderson, 1980 in Livingston and Cox, 1985). The "first flush" of pollutants refers to the largest concentration of stormwater runoff pollution normally occurring during the early portion of a storm event with concentrations tapering off as the runoff continues (Figure 2). Florida studies (Wanielista, 1979) identified that for a variety of land uses the first one half inch of runoff when projected to annual loadings, contained 80-95% of the total annual loading of most stormwater pollutants (Livingston, 1985). In addition, the studies indicated that as the drainage area increases above 100 acres the annual pollutant load contained in the first one half inch of runoff drops below 80% because of the diminishing effects of the first flush of pollutants from larger watersheds (Wanielista, 1979). This information supports the performance standard for projects larger than 100 acres which is the treatment of runoff from the first one inch of F1 RST FLUSH Amount Rate 01 oi Pollutants Discharge Pollutant concentration Run* i f Beginning of $form Time Figure 2. Concentration of Pollutants in the "First Flush" (Livingston and Cox, 1985). rainfall. Treatment of stormwater normally occurs either by retention or detention with filtration. Retention treatment of stormwater requires the diversion of runof f to a separate treatment area without any discharge to surface water bodies. Examples of retention treatment includes discharges through percolation, exf iltration, and evaporation processes and generally have residence times less than three days. Detention facilities are designed in-line systems where ali of the runof f from a drainage area passes through a treatment pond and is subsequently discharged to surface waters. The Chapter 17-25 F.A.C. Rule of 1982 required that discharges from detention ponds pass through a suitable f ilter material to remove suspended materials and that fraction of the dissolved constituents in stormwater associated with particulate materials. The Stormwater rule has been reviewed regularly to ensure that progressive stormwater management techniques are implemented. Significantly, the FDER initiated rule making in November, 1984 to revise Chapter 17-25 F.A.C. in order to achieve the following objectives, according to Livingston (1985): 1) TIo implement performance standards for storrrwater management systems that incorporate isolated wetlands as mandated by the Warren S. Henderson Wetlands Protection Act. 2) To bring about greater consistency among treatment requirements for point and nonpoint source discharges. 3) Th promote more innovative and comprehensive stormwater management. The revised rule was adopted by the Environmental Regulation Commission on March 28 and became effective on May 8, 1984. The major changes reported by Livingston (1985) to the rule are: 1) Provision for stricter treatment requirements for stormwater discharges to waters already below water quality standards. 2) A required safety factor of at least two for filtration systems unless the applicant submits test results, measured permeability rates, soil test or other field data to demonstrate that a lower safety factor is appropriate. 3) A public safety requirement that wet detention and retention basins either be fenced or contain side slopes that are no steeper than 4:1. In addition, all slide slopes shall be stabilized to minimize erosion and subsequent sedimentation of the basins. 4) Mandated erosion and sediment control best management practices (EMP's) during construction to ensure that sediment remains on-site. 5) Oil and grease removal BMP's for sites which are a potential source of oil and grease in excess of water quality standards. This applies to most commercial or industrial land uses, multi-family residential projects or highways. 6) An additional level of treatment for direct discharges to Outstanding Florida Waters (OFW). 7) The conversion of noticed exemptions to a general permit except in the geographical area served by the Southwest Florida Water Management District. 8) A new general permit for storrrwater management systems, that include a combination of practices such as swales, pavement, landscape or natural retention that provide for the percolation of a three-year, one-hour design storm within 72 hours. 9) Permitting of regional stormwater discharge facilities that -are designed and constructed to accept and adequately treat stornwater from multiple parcels. A new exemption is also provided for those who will discharge into a regional facility. The major objective is to prcrnote the concept of a local govermnent stormwater utility and provide more ccgnprehensive stormwater management throughout a watershed. 10) The implementation of performance standards for the permitting of wetland stormwater discharge facilities. The wetlands that may be used for stormwater management are those which are connected to other state waters by either an artificial watercourse or an intermittent watercourse. The performance standards require the same volume of treatment as other stormwater discharge facilities and generally follow the same pretreatment guidelines previously discussed. However, the performance standards also set low and high water levels within the wetland to ensure that it is neither desiccated nor over-impounded, thereby maintaining the wetland's hydroperiod which is a critical element in protecting the ecological characteristics of the wetland. Tb maximize the natural treatment functions of the wetland, the stornwater must enter the wetland via sheetflow and be drawn down over five days with no more than half of the treatment volume discharged from the wetland within the first 60 hours. Wetlands stormwater discharge facilities will be monitored to determine the impact of stormwater on the ecology of the wetland and evaluate the effectiveness of the wetland in -reducing stormwater pollutant loads. Effective in October 1984, the Florida Department of Environmental Regulation contacted by rule stormwater regulation to the Southwest Florida Water Management District (94FWMD). The delegation of authority to SWFWMD included the majority of regulatory responsibilities except for the following areas whose responsibility is retained by FDER: 0 The discharge of stormwater to groundwater resources. 0 The use of wetlands for stornwater storage and treatment. 0 Water use systems that ccmbine stormwater with other sources of pollution (i.e.: industrial runoff, wastewater mixed effluent systems). 0 Redevelopment areas or retrofilling older stormwater treatment systems. 0 Permitting applications for the SWFTAM. The most recent adopted Chapter 17-25 F.A.C. (DER, 1986) has been included in Appendix A. Program Evaluation As previously mentioned, the Stormwater Rule receives periodic review and is revised to resolve permitting concerns. Most recently, problems with dete7ntion facilities using filtration systems has required FDER to advise permit applicants to select another form of treatment. The FDER is currently undergoing revision to the Stormwater Rule, Chapter 17- 25, F.A.C. to reflect the most recent regulatory requirements (see draft in Appendix B). The general changes proposed in the draft revised rule (October 10, 1988) are as follows: 0 Revise chapters 17-25 F.A.C. to more accurately reflect Water Management District stormwater rules, to assist with consistent review between agencies. 0 Require the depth in retention ponds to be no deeper than ten feet. This will provide more natural pond character without promoting deep oxygen depleted "dead zones" in the bottom of stormwater facilities. 0 The rule change mandates 35% of the surface area consist of a planted (or mulched) littoral zone for biological assimilation of pollutants. 0 Wet detention stormwater discharge facilities will contain the runoff and bleed down required stormwater volumes in no less than 5 days with no more than one-half of the volume to be discharge within the first 60 hours. 0 -A permanent pool of water will be maintained or the residence time of at least 14 days is required for the bleed down to the pond bottom. Extending the residence time allows degradation and consumption of the majority of oxygen demanding substances within the stormwater treatment facility before discharge to state waters. 0 Performance standards are recommended to be increased f rom treating runoff from the first one inch of rainfall or, as an option for drainage areas less than 100 acres the f irst one half inch of runoff; to treating runoff from the first two inches of rainfall or one inch of runoff, respectively. 0 The use of underdrain filter systems have been withdrawn as a feasible treatment facility. 0 Clarification of project responsibilities for compliance monitoring to verify design and construction of treatment systems. In addition, the FDER is considering delegating authority of stormwater treatment in wetlands to the approved Water Management Districts (WMD) for regulation. Since the WMD's have increased jurisdiction over isolated wetland systems and other surface water bodies, the application of this Stormwater rule and *0 policies to wetlands will prevent duplicative permitting or review. The FDER will propose the creation of "Drainage Improvement Districts: during the 1989 Florida Legislative session. Initial observations indicate the intent of the Drainage Improvements Districts (DID) will be to create a taxing district for the maintenance, operation and improvement of stormwater treatment facilities approved by FDER- Current maintenance requirements are the responsibility of local governments, landowners and homeowner associations. The DID will provide a long-term steady source of funding to ensure proper operation of existing approved facilities. The DID will additionally provide the agency to develop reconstruction (retrofit) guidelines for existing "older" developed areas. It is unlikely that the provision to resolve retrofitting of older land uses will be addressed during the 1989 Florida Legislative Session. Recommendations The FDER continues to evaluate ioplementation of Chapter 17-25 F.A.C. and revise where appropriate to iiTprove and coordinate stornwater regulation. The most recently recommended revisions to the Stormwater Rule resolve numerous problematic design and implementation concerns raised during the interview process of this report. However, additional stormwater regulation and management issues remain unresolved and can potentially affect water quality and quantities within the Little Manatee River drainage basin. The number one issue raised most often during the interview process was stormwater controls for agricultural activities. Agricultural runoff normally contains loadings of nitrogen and phosphate, herbicides and pesticides, and excessive quantities of oxygen demanding substances and coliform bacteria. Agricultural activity represents one of the largest land uses in the Little Manatee River basin and remains predominately unregulated. The Tampa Bay estuary receive additional water quality protective regulation recently from the Grizzle-Figg Act which requires Advanced Wastewater Treatment (AWT) for all domestic wastewater effluent discharges into the bay. The focus of attention by the Southwest Florida Water Management District (SWFWMD). Surface Water Improvements and Management (SWIM) Program is also on urban stormwater management. With the increase of awareness and protective action taken for the estuary and its tributaries, agricultural runoff will be a vital component of any water quality/quantity management program to evaluate and regulate problematic agricultural activities. Management of agricultural runoff must be initiated for all newly established lands as a priority. Educational programs are required to assist agribusiness in preventing erosion, sedimentation, excess fertilizer, pesticide and herbicide applications. Eventual stormwater management of existing agricultural areas will be necessary to support water quality maintenance or improvements. Retrofitting for stornwater management cannot and must not be limited to agricu-Itural areas. Urbanized basins throughout the State of Florida continue to pour excessive nutrient, metal, petroleum and bacterial constituents into state surface water bodies. Reconstruction for stormwater treatment in any urbanized atmosphere is very expansive, and using existing technologies requires large tracts of land for treatment. However, with wide public acceptance and commitment,these problems are not insurmountable. Water quality problems in the Tampa Bay region are the result of decades of development and urbanization. Naturally, cures for problems will require a similar time frame for resolution. A framework to begin implementation of stormwater control for predeveloped land uses should include the following: 0 Any regulation must address agriculture and urban land uses. 0 An inventory of non-point source loadings is required to establish priorities for the greatest improvements. 0 Guidance for improvements must come from the state level to assist local governments. This can include seed funds to supplement and support initial or innovative projects. 0 The majority of efforts will be on a project by project basis. This single point is important since regulators must be aware of the time frame necessary for improvements. By establishing priorities and long term funding support, -projects and improvements can be accamplished on an incremental basis. 0 Initial projects will require some monitoring to ensure adequate treatment levels and identify innovative techniques for future projects. Since the FDER is the lead state agency for regulation of water quality, it will also be their responsibility to ensure coordination -and standardization of development review. FDER is supportive of authority delegation to SWFWMD with eventual further delegation to the county agencies. Evaluation of the "domino" delegation of authority for stormwater regulation and its affects on the Little Manatee River watershed is discussed in greater detail during review of the county stormwater management practices. In addition, many unanswered questions remain for design and techniques used in stornwater management. Responses during the interview process indicated a range of options as to whether treatment systems are functioning properly. A lack of in-situ information available to regulators and planners was also identified. FDER should continue to review storTrwater treatment techniques and other applications for future rule revisions and refinements. Concern is also expressed with construction of stormwater treatment facilities. The actual engineering and design of treatment facilities must be approved by a certified engineer and reviewed by the appropriate agencies before issuance of a permit. However, ccrnpliance monitoring has been identified as the weakest link of the permitting process at this time. Construction verification is necessary and "as- built" certification to ensure. proper installation and adequate treatment occurs. Efforts by the state and county agencies to create "storTrwater utilities" must include language dealing with the liability issue. Specifically, if the state and counties will create and maintain stormwater facilities then ultimately they will be responsible for water quality standards in the receiving water body during any and all storm events? The liability issue needs to be resolved before attempts to apply storrrwater regulation to predeveloped areas, since a net benefit over time will occur. Finally, the State of Florida should continue to provide technical support and seed funds for innovative techniques and pilot retrofit projects for local governments. Additionally, regional stormwater facilities require coordination and financial assistance from multiple agencies for implementation. In addition, multi-use systems (i.e.: recreational soccer field used for detention during rain events, grassed walkways for swales, etc.) can be applied statewide after initial construction and testing. III. SOUTHWEST FLORIDA WATER MANAGEMENT DISTRICT Imlementation of ChaT)ter 40D-4 The Southwest Florida Water Management District (swFwmD) was delegated stormwater authority from the Florida Department of Environmental Regulation by rule (Chapter 17-25, F.A.C.). Delegation of stornwater authority occurred February 1, 1982 to the WMD when SWFW-E:) adopted Chapter 40D-4 Management and Storage of Surface Waters (SWFWMD, 1988). Appendix C includes the March 1988 version of Chapter 40D-4. Implementation of stormwater regulation requires SWTWMD Chapter 40D-4 to be consistent or further FDER Chapter 17-25. In addition, additional rules governing stormwater are found in Chapter 40D-40 (General Surface Water management Permits) as they relate with wetlands. Th simplify the permitting process, SWFWMD ccimbined the regulations of surface and stormwater in these rules. Therefore, the rules contained in Chaptet 40D-40, and SWFVM's "Basis of Reviews for Surface Water Management Permit Applications within the Southwest Florida Water Management District" (Basis of Review) also address stormwater regulation pursuant to Chapter 403, Florida Statutes, and Chapter 17- 25, F.A.C. (SWFW4D, 1988). The SWFVM's Basis of Review includes stormwater system design criteria as well as additional clinical and administrative information. The SWF&M requires the storage of potential f loodwaters through regulation of water quality in stormwater runoff. Primarily the SWFWMD requires the following of projects to promote water quantity benefits: 1 Projects located within a closed drainage basin (containing no surface outfall below the 100-year flood level), the required retention volume shall be the post development runoff volume less the pre-development runoff volume. In addition, the total post development volume leaving the site shall be no more than the total pre-development volume leaving the site for the 100-year storm event. 2) Projects with open drainage basins (free connection with surface outfall) must maintain historic discharge rate. 3) No net encroaclmnent into the 100-year flood plain which would adversely affect either conveyance, storage, water quality or adjacent lands is allowed. SWMM allows the ccnipensation of the 100-year flood plain storage volme. The SWFWMD routinely uses the storage of potential floodwaters to prcmte aquifer recharge, hydrate previously dewatered wetlands and maintenance of groundwater levels. Chapter 40D-4 requires projects be designed so that discharges will meet applicable state water quality standards as set forth in Chapter 17-3 and Section 17-4.242. (F.A.C) - SWFWMD currently requires the following design criteria alternatives: 1) Wet detention treatment systems are designed to treat one inch of runoff from the tributary area. Wet detention must allow 35% of the surface area as littoral zone for biological treatment. The treatment volume shall be discharged within 5 days with no more than one-half of the total volume discharged within the first 2.5 days. Since wet treatment requires detention of the stormwater for treatment (biological assimilation, sedimentation) only the volume of water drained below the weir within 36 hours can be counted toward storage volume required for water quantity treatment 2) Detention systems with effluent filtration must treat the runoff fran the first one inch of rainfall; or as an option for projects less than 100 acres, the first one-half inch of runoff - The effluent must flow through two feet of specified filter material before discharge. The detention volume must be made available within 72 hours and the treatment volume can be applied toward the-water quantity requirement. 3) Both on-line retention treatment systems (ccobines water quantity and quality treatment systems) and off line retention treatment systems (separates water quality treatment from quantity requirements) must treat the runoff from the first one-inch of runoff; or as an option for projects less than 100 acres, the f irst one-half inch of runof f Thtal retention volume shall again be available within three days, however only the treatment volume can be applied toward the storage volume requirements. In addition, as required in Chapters 17-25 and 40D-4, projects discharging directly into Outstanding Florida Waters (OFW) shall be required to provide treatment for a volume 50% more than required for the selected treatment system (wet detention, detention with effluent filtration, on-line retention or off-line retention). In order to meet the design requirements and performance standards, the surface water management system must include the controlled release of water volumes in excess of that created by the design storm event, to insure adequate operation of the system. Gravity control devices or bleed-<iown mechanism are designed to discharge the water quantity treatment volume and water quality volume within the predetermined performance standard to control offsite discharge of potential floodwater and prcmote water quality treatment. Projects that implement the approved construction techniques are Presumed E0 provide "reasonable assurance of ccmpliance" with the state water quality standards. Program Evaluation The Southwest Florida Water Management District is in the appropriate level of government for review of stormwater permitting activities. This assessment is supported by the regulatory requirements of the 94FWMD which include -water quantity and quality, isolated wetlands, water consumption, the Surface Water Improvement and Management (SWIM) program and groundwater protection. This affords SWFTAM the ability to take the watershed or "big picture" approach toward stormwater management and regulation. The SWF-&M additionally participates in tributary management plans with local governments, primarily to resolve problematic flooding concerns. However, the SWFTAM increasingly has supported alternatives that not only alleviate flooding conditions but support water quality and habitat improvements as well. It is the watershed system approach that ultimately is required for any comprehensive management plan. Similarly, the implementation of Chapter 40D-4 (F.A.C.) by the SIFWMD can support such activities as wetland enhancement, groundwater recharge, maintenance of groundwater levels (prevention of salt water intrusion), tributary flows, promotion of water quality and maintenance of water quantities. The SWFWMD currently considers the potential for wide-ranging impacts created by proposed permitting activities during project review. In addition, the SWFWMD continually revised Chapters 40D-4 and 40-D-40 to reflect changes in Chapter 17-25 to include identified Best Management Practices (EMPIs) and Best Available Technologies (BAT's). Recommendations The greatest assistance SWFWMD can apply toward protection of the Little Manatee River watershed is the development and implementation of an environmentally sound management plan. No significant flooding problem currently has been identified within the watershed; however, identification of hydraulic performance characteristics and appropriate management recamendation will assist to buffer the watershed from future development perturbations. Protection of existing natural systems will fur-ther protection of vegetational cmmunities promoting water quality and habitat objectives. Management recomendations for the Little Manatee River watershed should support protection of the 100 year floodplain. Protection of the 100 year floodplain provides the storage volume, habitat and water quality buffers for the jurisdictional areas normally preserved through the permitting process. In addition, through the Save Our Rivers program administered by SWFVZD, significant parcels of land can be acquired as the ultimate protection from development. Currently the Hillsborough County Endangered Lands Acquisition and Protection Program (ELAPP) and the Conservation and Recreational Lands (CARL) program are reviewing tidally influenced areas within the Little Manatee River for public acquisition. The WMD through its Save Our Rivers program can supplement ongoing efforts. Currently the Little Manatee River basin is predominantly in agricultural land uses. Existing trends identify urbanization development pressures increasing, due to the construction of Interstate 275 and phosphate mining in the upper reaches of the watershed. Future development will require compliance with appropriate stormwater regulation. Agricultural activity remains relatively unregulated and continues to provide pollutants and sedimentation into the tributary. The SWFWMD can and should take the initiative to begin requiring agribusiness to ccuply with the same regulations as applied to all other forms of land alteration activities. The agricultural and silvaculture exemptions must be eliminated. However, any improvements to water quality - even in moderately developed watersheds such as the Little Manatee River - must consider retrofitting developed areas to comply with current regulations. Agricultural areas and the developed centers of Ruskin and Sun City Center can be identified for prioritization of problematic stormwater pollution sources. Areas within Sun City Center were permitted before 1982, exeTnpting the community from water quality stormwater controls. Ongoing activities are relatively similar to those required of the FDER. Projects permitted by SWF@ZM, however, are required to submit "as built" certification to verify actual construction with permit requirements. Many projects continue to be certified by Professional Engineers after the actual construction and many permit requirements may not be inplemented during construction. Compliance follow-ups and appropriate enforcement actions continue to be limited to a few projects. IV. TAMPA BAY REGIONAL PLANNING COUNCIL Develoments of RecTional Impact As required under Section 380.06, Florida Statutes, and Chapter 22F- 210, Florida Administrative Code, the Tampa Bay Regional Planning Council (TBRPC) reviews significant developments termed Developments of Regional LTpact (DRIs). The TBRPC's sphere of influence includes the four counties of Pasco, Pinellas, Hillsborough and Manatee, and the 43 local governments located within these counties. The Development of Regional LTpact (DRI) Application for Development Approval (ADA) is intended to provide information to local governments to assist them in making decisions concerning developments having a greater than local impact. Just as the DRI process is not intended to supplant local or state substantive or technical reports required pursuant to local or state permits. Rather, the ADA provides a camprehensive look at a proposed development and serves as the basic data source for the preparation of the regional planning agency's final report amd reccmendations to the local government on the regional impact of the proposed development. The regional planning agency, in fulfilling its responsibilities under Chapter 380, Florida Statutes, will use this base information provided by a developer to consider whether, and the extent to which: (a) The development will have a favorable or unfavorable impact on the enviroment and natural resources of the region; (b) The development will have a favorable or unfavorable impact on the economy of the region; (c) The development will efficiently use or unduly burden water, sewer, solid waste disposal, or other necessary public facilities; (d) The development will efficiently use or unduly burden public transportation facilities- r (e) The development will favorably or adversely affect the ability of people to find adequate housing reasonably accessible to their places of employment; and (f) The development complies or does not omply with such other criteria for determining regional impact as the regional planning agency shall deem appropriate. The preparation of the ADA is the first major step in the DRI process which establishes the framework for a cooperative planning and review effort between the developer, the local government, regional agency, and federal and state agencies. The developer must contact the appropriate local goverment and regional planning agency before beginning the preparation of the application. When a project is determined to trigger Section 380.06, F.S. review, the applicant is required to address the following information requirements and questions related to stormwater managexnent and water quality: 11. Maps A. A general location map. B. A recent vertical aerial photo of the site with project boundaries delineated. C. A topographic map with project boundaries identified (contour intervals from one to f ive feet should be determined in consultation with the appropriate regional planning agency and local gove rnm ent, based on topographic characteristics of the site). Delineate 100-year f lood prone areas (including hurricane flood zones) and indicate major land surface features. D. -A land use map (refer to 12-B) showing existing uses on and abutting the site. E. A soils map of the site. (Map E) If available, U.S.D.A. Soil Conservation Service (SCS) published soils surveys are preferable. F. A vegetation associations map indicating the total acreage of each association, based on the Level III vegetation types described in The F lorida Land Use and Cover Classification Systezn: A Technical Report. G. A master drainage plan for the site. Delineate existing and proposed drainage areas, water retention areas, drainage structures, drainage easements, canals and other major drainage structures. H. A master development plan for the site. Indicate proposed land uses, development phasing, major public facilities, utilities, easements, rights-of-way, roads, thoroughfares and other significant elements. I. A map of the service areas of all existing and proposed public facilities (e.g., sewage, water supply, fire protection, pubic transit, hospitals, emergency medical facilities, etc.) which serve the site. 15. Envitoment and Natural Resources: Water A. Describe the existing hydrologic conditions (ground and surface water) on and abutting the site, including identification and discussion of any potential aquifer recharge areas. B. Describe in terms of appropriate water quality parameters the existing ground and surface water quality conditions on and abutting the site which will be influenced by this development. 16. Environment and Natural Resources: Wetlands A. How many acres of wetlands are found on the site? For these purposes, wetlands are described as areas which are subjected to permanent or prolonged periods of inundation or saturation (water is at the soil surface at least two to seven months, seven out of ten years), and/or which exhibit vegetative caTmunities and/or soil types characteristic of this hydroperiod. The Florida Land Use and Cover Classification System: A Technical Report, includes a detailed wetlands definition and is available from each regional planning council. B. What alterations or disturbances to the wetlands are proposed? C. What wetland areas will be preserved in their natural or existing state? Describe the planning approach that will be utilized to accomplish this preservation. 17. Environment and Natural Resources: Flood Plains A. Is any develoFrnent proposed within the 100-year f lood prone area as identified by the Federal Insurance Administration? If so, indicate whether all f loor elevations will be above the 100-year f lood prone level, and discuss methods which will be used to compensate for the potential flood hazard. B. Does the local jurisdiction in which this development is proposed qualify for federal flood insurance? If so, attach a letter of verification from the local government. 18. Environment and Natural Resources: Vegetation and Wildlife A. Identify the dominant species and other unusual or unique features of the vegetation associations delineated on Map F, and specify their ecological function, health and conditions. B. Are any rare or endangered plants found on the site? If so, what measure will be taken to protect these species? C. What wildlife (including aquatic life) nest, feed, reside on -or migrate to the site? What measures will be taken to protect this wildlife and their habitats? D. Are any of the wildlife listed under (C) above considered endangered or threatened species? If so, provide a detailed statement on what steps will be taken to protect them and their breeding, nesting, and feeding areas. 22. Public Facilities: Drainage A. Describe the various elements of the proposed drainage system shown on Map G and discuss the design capacity criteria to be used for the various elements. Include information as to what design storm (e.g. 10 year-24 hour, 25 year-24 hour, etc.) will be used for what portions of the system. B. Fran Map G, indicate the total number of acres in each drainage area and specify the acreage of any portions of drainage areas outside the site boundaries. Indicate the total acres and storage capacity of proposed retention areas, and the total acres of proposed in-pervious surfaces. C. Specify and cmpare the volume and quality of runoff from the site in its existing condition to the anticipated runoff at the end of each phase of development. Indicate what provisions will be incorporated in the design of the drainage system to minimize any increase in runoff from the site and to minimize any degradation of water quality in the ultimate receiving body over that occurring in its pre-development state. Indicate the major points of discharge for storm water. D. who will operate and maintain the drainage system after ccupletion of the development? upon receipt of the applicant's application for Development Approval (ADA), the information is compared against Council policies included in Future of the Region - A Comprehensive Regional Policy Plan (TBRPC, 1987). Informational insufficiencies are identified and the applicant may go through several Sufficiency Responses before the Council under-takes a final review and provides a report with recommendations to the appropriate local goverment. upon resolution of all concerns the applicant is issued a Development Order (DO) by the local government with specific construction and monitoring requirements for the project. Comorehensive Planni In June 1985, the Florida legislature took an historic step by passing the Growth Management Act. The legislation included a new State Comprehensive Plan, guidelines for the preparation and adoption of state agency, regional and local goverment comprehensive plans and coastal protection and development or regional impact reforms. This action initiated up a new era of integrated planning for the State of Florida. - The Local Goverment Comprehensive Planning and Land Development Regulation Act (Chapter 163, Part II, F.S.) mandates that every local government in the State of Florida prepare a comprehensive plan, or amend its existing comprehensive plan, to conform with the requirements of the statute and Chapter 9J-5, F.A.C. While the Florida Department of Community Affairs (DCA) has the authority and responsibility to review and determine whether local comprehensive plans are in compliance with Chapter 163, F.S., the regional planning councils of Florida have the authority and responsibility to review local comprehensive plans in the context of the relationship and effect of the local plan on the adopted regional policy plan, prepared pursuant to Chapter 186, F.S. and Chapter 27E-4, F.A.C. Local governments are required to prepare comprehensive plans that are consistent with the State Comprehensive Plan and the appropriate regional policy plan. A local plan will be considered consistent with the State Plan and the appropriate regional plan if it is "compatible with" and "furthers" such plans. The term "ccurpatible with" means that the local plan is not in conflict with such plans; the term "furthers" means to take action in the direction of realizing goals or policies of the state or regional plan. For the purposes of determining consistency of the local plan with the state comprehensive plan or the regional policy plan, the state or regional plan will be construed as a whole and no specific goal and policy will be construed or applied in isolation from the other goals and policies in the plans. Upon receipt of a proposed local comprehensive plan or plan amendment, DCA will, within five working days, transmit copies of the plan or plan amendment to the appropriate regional planning council and other agencies and governments, which may include but not be limited to, the following: 0 The appropriate county land planning agency 0 The Department of Environmental Regulation 0 The Department of Natural Resources 0 The Department of Transportation 0 The appropriate water management district(s) 0 Florida Department of State 0 Florida Game and Fresh Water Fish Commission, and 0 The Department of Agriculture and Consumer Services, Division of Forestry (county plans only). The regional planning councils, and other reviewing bodies, will have 45 days from the receipt of each local plan to provide written comments to DCA. All reviewing agencies may make comments, objections and recomendations on the proposed local plans. The terms "comment, objection and recommendation" are defined pursuant to Chapter 9J-11, F.A.C., as follows: 0 "Counent" means a statement of professional opinion regarding -the adequacy of an element or portion of a comprehensive plan or plan amendment; 0 "Objection" means a statement which identifies a portion of a comprehensive plan or plan amendment that is not consistent with one or more provisions of Sections 163.3177, 163.378, 163.3191, Florida Statutes, the State Comprehensive Plan, the appropriate comprehensive regional policy plan, or Chapter 9J-5, Florida Administrative Code; and 0 "Recamendation" means a statement which proposes possible modification(s) to a comprehensive plan or plan amendment that would bring the applicable portion of the plan or plan amendment into compliance. After receipt of all agency camments, DCA has an additional 45 days to review these caments and transmit to the local goverment any ccments, objections or recommendations for modification they may have. Upon receipt of DCA's camments (which become part of the public record and are admissible in any proceedings involving the plan), the local goverment has 60 days to adopt, adopt with changes, or determine that it will not adopt, the recommended changes. This decision will be made after, or as part of, the final public hearing on the matter. Following adoption, the local government will suhmit the amended plan to DCA. DCA then has 345 days to review the adopted plan to determine if it is in ccopliance with Chapter 163, F.S. Th find the plan not in ccaTpliance, DCA must have participated in the pre-adoption public hearing, if requested to do so by the local government. The determination of ccmpliance must be based on DCA's written comments as suhmitted to the local government prior to adoption or any changes made after the initial review by DCA and included in what was adopted by the local goverment. During the 45-day final review period, DCA will publish a Notice of Intent to find the plan or plan amendment in compliance or not in compliance in the manner required in Section 163.3187(15)(c), F.S. If DCA f inds the plan not in compliance, the Notice of Intent is forwarded to the Division of Adninistrative Hearings, Department of Adninistration, which conducts proceedings according to Section 120.57, F.S. All affected parties may participate in the proceedings. A hearing officer will submit a recommended order to the Adninistration Camission for final action. The Tampa Bay Regional Planning Council is one of the 11 regional planning councils in the state of Florida with the authority and responsibility to review local comprehensive plans in the context of the relationship and effect of the local plan on the adopted regional policy plan. Future of the Region, A Cowrehensive Regional Poli Plan for the Tampa Bay Rection was adopted by the TBRPC in 1987, and will serve as the sole document against which local plan consistency is to be measured. The procedures (steps) described below will be followed by TBRPC staff when reviewing local comprehensive plans. Step 1 - It will be requested that each local goverment transmit -a copy (or copies) of their new or amended comprehensive plan to TBRPC on the same day (or earlier) that they provide copies to DCA. A local goverment will notify the TBRPC as to any elements that are either missing or incamplete, or if the plan will be transmitted later than the scheduled Chapter 9J-12, F.A.C., submittal date Step 2 - TBRPC staff will have approximately 35 calendar days 920 to 24 working days) to review each local plan before ccoments are to be drafted and sent to TBRPC members. Step 3- TBRPC staff ccuments will be sent to TBRPC members 10 days prior to the regularly scheduled monthly meeting, as part of the normal mailout from each regular TBRPC meeting. At the same time, a copy of the staff comments will be transmitted to the appropriate local government. Step 4 - At its regular monthly meeting, the TBRPC will consider the draft staff comments and any oral or written conments submitted subsequently. Action will either be to approve the comments, as drafted, or approve the ccuments with changes. Action is also needed to approve the transmittal of comments to DCA. Step 5 A final review letter will be prepared, along with approved omments, for transmittal to DCA and the appropriate local government. The f inal review letter must be prepared in a timely manner in order to meet the 45-day statutorily-required time frame. It should be noted that all reviews will be the result of official Council action. The regional goals and policies set forth in the Future of the ReQio will be the primary substantive focus of the local plan review. The final review product will be a statement, with a corresponding report, related to the local plan's consistency with the regional plan. The corresponding report will contain comments, objections and/or reccnmendations with regard to the local plan's compatibility with, and furtherance of, Future of the Regio The following TBRPC review guidelines consist of three parts. Part I is entitled "An Interpretation of the Comprehensive Regional Policy Plan Along the Lines of Chapter 9J-5, F.A.C." Part I identifies those regional plan goals and policies that most clearly relate to each of the required local plan elements. Part II of the guidelines addresses three optional elements that may be included in a local plan. Regional goals and policies that most clearly relate to each of these optional elements are, again, identified. It should be noted that any optional elements that a local government may choose to prepare and adopt are subject to TBRPC review. Part III lists the regional issues that are relevant to the successful implementation of the regional plan but are not required to be addressed by local plans. The Council may comment on these issues. The TBRPC's review guidelines have been prepared to assist local goverments in preparing and adopting local plans that are consistent with and further the regional plan. The Council recognized that the successful implementation of the State's integrated planning framework requires the cooperation and involvement of the Council and every local government in the Tampa Bay Region. In keeping with this spirit of cooperation, every effort will be made for close coordination between the TBRPC and all local government entities. Council Stormwater Policies The following TBRPC goals and policies are representative of review guidelines implemented by the Council for review of stormwater quality and quantity as they relate to Cornprehensive Planning, DRIs and the Intergovernmental Coordination and Review (IC&R) process: 8.2. REGIONAL GOAL: BY 1995, CONSERVATION PRACTICES WILL BE IDENTIFIED AND UTILIZED TO REDUCE VQATER CONSUMPTION THROUGHOUT THE INDUSTRIAL, COMMERCIAL, AGRICULTURAL, AND RESIDENTIAL SECTORS. 8.2.1 Poli A ccrnprehensive regional, long-term water conservation program shall be developed. Strategies consistent with this regional program shall be developed and implemented on the local level. 8.2.2 Poli : Clarification of the responsibilities and representations within the various agencies involved in water supply protection and distribution shall be made available to the public. Periodic examination of equitable representation and participation on such agencies' governing boards shall be conducted. 8.5. REGIONAL GOAL: BY 1991, THE REGION WILL INCREASE THE PROTEC!TION OF MAJOR PUBLIC WATER SUPPLIES AND WELLFIELDS. 8.5.1 Poll : Prime groundwater recharge areas and cones of influence of existing and future major public water supplies and well fields shall be identified and mapped. 8.5.2 Policy: Regulations which serve to provide special protection to these recharge areas shall be implemented at the state, regional and local levels. 8.5.3 Policy: Activities which could conceivably breach the confining unit to the Floridan Aquifer shall be strictly regulated. 8.6. REGIONAL GOAL: BY 1990, INaREASED COORDINATION BETWEEN Ga@@ AGENCIES WILL REDUCE HUMAN-INDUCED CONTAMINATION TO SURFACE AND GROUNDWATER RESOURCES. 8.6.1 Policy: Appropriate governmental agencies shall be required to develop plans to prevent, abate, and control surface and groundwater pollution. 8.6.3 Poli Programs to increase coordination between the various agencies charged with the protection and conservation of the region's water resources shall be developed. 8.7. REGIONAL GOAL: BY 1991, NEW DEVELOPMENTS IN THE REGION WILL BE REQUIRED TO USE THE BEST MANAGEMENT PRACTICES (BMPs) AND/OR PROCEDURES TO REDUCE POLLUTANTS IN STORMWATER RUNOFF. 8.7.1 Poli : Programs to ensure water reclamation and reuse alternatives for wastewater and stormwater disposal to surface water bodies shall be developed. 8.7.2 Poli : Whenever environmental or health concerns warrant, treatment facilities shall be required to utilize Best Management Practices and technologies. 8.8. REGIONAL GOAL: BY 1995, EXISTING DEVELOPMENTS WILL BE REQUIRED TO MAKE MEASURABLE PROGRESS TCVMRD MEETING STORAMTER STANDARDS. 8.8.1 Poli : Local governments should upgrade or retrofit drainage systems in urbanized areas to include stormwater treatment for water quality. 8.8.2 Policy: If onsite detention is not feasible, some payment in lieu of detention shall be made to local governments for construction of a regional stormwater facility within that drainage basin. 8.8.3 Policy: Redevelor-ment projects, irrespective of previous impervious cover, shall provide or support stormwater improvements within the affected drainage basin. 8.8.4 Poli : Agricultural runoff shall be handled with Best Management Practices to minimize its impact upon receiving water 8.9..REGIONAL GOAL: BY 1995, THERE SHALL BE AN INCREASE IN THE EFFECTIVENESS OF PROGRAMS PROTECTING OR ENHANCING THE ECOLOGICAL FUNCTION OF NATURAL SYSTEMS (AQUATIC, WETLAND AND TERRESTRIAL SYSTEMS). 8.9.1 Policy: Programs shall be developed at the regional and local levels to identify, protect and conserve the natural character and function of area lakes, streams, estuaries, wetlands, floodplain areas, and upland areas. 8.9.2 Policy: Local government comprehensive plans shall incorporate the following: a. adoption of criteria for work in lake, riverine and wetland systems which will protect water quality, wildlife habitat and natural hydrologic functioning of these areas; b. conservation of valuable upland habitat and wetland systems; C. preservation of habitat for endangered and threatened species; d. establishment of ecological minimum flow criteria and hydroperiod for surface waters; e. utilization of biological treatment methods and natural areas, such as wetlands, for stormwater treatment in areas of development/redevelopment to the maximum feasible extent. 8.9.3 Poli : In regionally significant development proposals, developers shall assess the cumulative impacts of such activities as dredge and fill, waste disposal, and construction on the health of the natural systems. 8.10. REGIONAL GOAL: BY 1991, LAND USE PRACTICES WILL REDUCE THE DISRUPTION OF NATURAL FLOODPLAIN FUNCTIONS. 8.10.1 Poli Regulations should be developed to prcmote appropriate land use practices ccupatible with floodplain areas and provide for performance standards for these land uses. 9.3. REGIONAL GOAL: BY 1995, AQUATIC PRESERVES IN THE TAMPA BAY REGION WILL BE MORE PRODUCTIVE THAN 1985 LEVELS AND HAVE A SIGNIFICANT IMPROVEMENT IN QUALITY OVER 1985 MEASUFJ2,=S. 9.3.1 Policy: Designated aquatic preserves shall be protected from development that would significantly alter their character. The creation, preservation and restoration of these preserves should be required. 9.3.2 Policy: Geographic gaps in the boundaries of the Tampa Bay aquatic preserves which result in ecological and political inconsistencies for management should be eliminated. 9.3.3 Policy: Buffer zones or other appropriate protection shall be established between pristine aquatic preserves and adjacent upland uses to prevent degradation of water quality, shoreline and marine habitats. 9.4..REGIONAL GOAL: BY 1991, ALL MARINE RESOURCES WILL BE PROTECTED FROM CONTAMINATION FRCM HUMAN-INDUCED PROCESSES. 9.4.7 Policy: Require through local land development regulations the highest level of cost-effective control and treatment for point and nonpoint effluent discharges to estuarine and near shore coastal waters. 9.6 REGIONAL GOAL: BY 1990, COASTAL AREAS WILL BE PROTECTED BY LOCAL GOVERNMENT CONTROLS AND OTHER BUILDING REGULATIONS THAT WILL ENHANCE THE CHARACTER AND FUNCTION OF BARRIER ISLANDS AND OTHER ENVIRONMENTALLY SENSITIVE COASTAL AREAS. 9.6.1 Poli : Land and water uses shall be ccimpatible with the protection of sensitive coastal resources. 9.6.2 Poli : The use of government funds to subsidize development should be prohibited in high-hazard coastal areas. 10.2 REGIONAL GOAL: BY 1991, LOCAL GOVOU,1ENTS WILL HAVE WRITTEN POLICIES, PROGRAMS AND/OR ORDINANCES THAT ADDRESS THE PROTECTION OF ISOLATED WETLANDS. 10.2.1 Poli A minimum identified buffer or other appropriate protection shall be maintained around acknowledged isolated wetlands where development activities or other activities may disturb the wetlands or associated wildlife. 10.2.2 Poli The hydrologic continuity and water quality of identified isolated wetlands shall be protected. Development activities or other land disturbances in the drainage area of the wetlands shall minimize alterations to the surface or subsurface flow of water into and fran the wetland and shall not cause in-pairment of the water quality or the plant and wildlife habitat value of the wetland. 10.2.3 Policy: Water users, such as agriculture and mining, shall prepare acceptable mitigation plans to minimize unavoidable impacts to nearby wetlands. 10.2.4 Policy: Mitigation measures shall be developed to provide water quality benefits and plant and animal habitat equivalent to the wetland destroyed or altered. Newly created wetlands should include at least 1:1 mitigation using the same type or more productive vegetation with at least an 80-85 percent natural cover rate, over a 2 to 5 year period. 10.4. REGIONAL GOAL: BY 1991, DEVELOPMENT IN 100 YEAR FLOODPLAINS SHOULD BE STRICTLY REGULATED. 10.4.1 Policy: New channelization shall be permitted only as a last resort in providing flood protection to existing development. 10.4.2 Policy: -New development shall not be located in river floodways (the area of highest velocity during flow), except in cases of overriding public interest. 10.4.3 Policy: New development permitted in the flood fringe (the area of the floodplain outside the floodway) shall be required to meet flood hazard construction requirements. 10.4.4 Poli : Channelization solely to create new lands for development shall be prohibited. 10.4.5 Poli : In cases where new channelization for flood protection has been fully analyzed and justified, such projects shall be carripd out with maximum protection to fish and wildlife habitat. 10.5 REGIONAL GOAL: BY 1991, NEW OR REBUILT DEVELOPMENT WITHIN THE 25-YEAR FU)ODPLAIN WILL NOT CONTRIBUTE ADVERSE WATER QUALITY IMPACTS FROM STOR4E%TER RUNOFF. 10.5.1 Poli : Local agencies shall encourage study and research to establish and map all established floodplain areas. 10.5.2 Poli Development along all river floodplains shall be low density with adequate setbacks to maintain existing areas of natural habitat. 10.5.3 Poli Floodplain management shall be required to prevent erosion, retard-runoff and protect the natural functions and values of the floodplain while prcooting public usage. 10.8 REGIONAL GOAL: BY 1991, THERE WILL BE MARKED CHANGES IN LAND REARRANGEMENT AND VEGETATION CLEARING PRACTICES THAT DEGRADE THE REGION'S NATURAL DRAINAGE AND PERCOLATION PATTERNS. 10-8.1 Policy: The use of buffer zones of natural vegetation between agricultural lands and water bodies shall be'required. 10.8.3 Policy: Unique land forms and geological features shall be preserved. 10. 8.4 Policy: New development shall avoid extensive alteration of existing topographic features. 10.8.5 Policy: The barrier islands shall be protected from development that impedes evacuation, geological function, and environmental character and function of the islands and inmediate vicinity. 10.8.6 Policy: Sediment control plans shall be required for all harvests in the region. The sediment control operations shall be implemented in accordance with specifications set out by the Soil and Water Conservation District and enforced by the Department of Natural Resources or the local jurisdiction. 13.6.REGIONAL BY 1995, GROUNDWATER CONTAMINATION DUE TO INAPPROPRIATELY LOCATED OR IMPROPERLY USED SEPTIC TANKS SHALL BE ELIMINATED. 13.6.2 Policy: Permitting process criteria for septic tanks and their fields shall take into consideration adverse impacts on water quality and aquatic resources. 13-6.4 Poli : An identification and location study of septic tanks associated with all ccmercial and industrial activities shall be conducted. An evaluation should be conducted concerning potential adverse effects on groundwater resources, water supply wells, and ground water recharge potential. 13.7 REGIONAL GOAL: BY 1995, GROUNDWATER CONTAMINATION DUE TO INAPPROPRIATELY LOCATED SPRAY IRRICATION SITES SHALL BE ELIMINATED. 13.7.1 Poli The selection of spray irrigation sites shall continue to be based on a ccirplete analysis of the treated effluent and a detailed hydrogeological analysis of the site to determine the potential for groundwater contamination from any hazardous waste or other pollutants. 22.1. REGIONAL GOAL: BY 1991, THE TAMPA BAY REGION SHALL BALANCE THE NEEDS OF AGRICULTURAL AND NONAGRICULTURAL LAND USES. 22.1.1 Poli : The preservation and utilization of agriculture land for agriculture uses, and the preservation of rural historic resources, are encouraged. 22.1.4 Poli : The use of buffer zones of natural vegetation between agricultural lands and water bodies to maintain good water quality is encouraged. 22.3. REGIONAL GQAL: BY 1995, SOIL EROSION SHOULD BE REDUCED. 22.3.1 Policy: Control measures to abate erosion shall be incorporated into mining, construction, agricultural and development activities. 22.3.2 Policy: The conservation of soil resources is encouraged to maintain the economic value of land for agricultural pursuits, and to prevent sedimentation of state waters. The Tampa Bay Regional Planning Council has established significant goals and policies which support or further existing state and federal rules and regulations. The TBRPC additionally reviews wetland management and alteration activities through the Development of Regional Impact (DRI) process and the Intergoverrunental Coordination and Review (IC&R) process. IC&R reviews include enviromnental impact assessments, feasibility studies, and dredge and fill applications. The Council makes recamendations to the permitting agencies. These development review activities require the caTparison of wetland impacts with Council policy to determine consistency. Many applications for wetland encroaclunent include stormwater management as mitigation of jurisdictional losses. Other Council Activities Affecting Stormwater At the request of several TBRPC members, the Agency on Bay Management, an arm of the Council, initiated the Natural Resource Committee to evaluate the current TBRPC policies regarding wetland management practices. Th assist the Natural Resource Cannittee Ln the evaluation, Council staff requested the following agencies to provide a brief overview of wetland management requirements: � U.S. Fish and Wildlife � U.S. Army Corps of Engineers � Florida Department of Environmental Regulation � Southwest Florida Water Management District � Environmental Protection Ccmission of Hillsborough County Representatives from each agency were requested to address three aspects of wetland permitting: 1. Permittability of a project - or what type of projects can be considered for potential wetland impacts. 2. Campensation or mitigation - once wetlands have been identified for disturbance, what form of curpensation or mitigation is acceptable to offset the impacts. 3. Follow-up monitoring or compliance - Af ter the permit has been issued, how do the agencies verify ccmpliance with permit conditions? The Natural Resource Ccomittee will provide recommendations to the full Agency upon resolution of the following objectives: � Evaluate Council policies - are they enough? � Develop standards supportive of fish and wildlife resources. � Develop standards that are not inconsistent with permitting agencies. Initial reccm-nendations of the ccrmittee suggest preservation of the 100-year floodplain to ccmbine protective measures for wetlands, transitional areas, wildlife resources and buf fer zones into one management composite. Agency reccmendations will be tabulated in a report and provided to the Tampa Bay Regional Planning Council for consideration in the spring of 1989 (TBRPC, 1989). The Tampa Bay Regional Planning Council has historically participated in numerous grant programs, such as this program funded through a Coastal Zone Management grant administered by the Florida Department of Environmental Regulation. The TBRPC recently participated with the Southwest Florida Water Management District to compare the Council's review document with the SWIM plan for Tampa Bay. The 1987 Florida legislature passed one of the most important pieces of environmental legislation - the Surface Water LTprovement and Management (SWIM) Act, which seeks to initiate the restoration and protection of surface water bodies on a state-wide basis. The legislation mandated that the state's five water management districts implement the Act with the Department of Environmental Regulation (DER) as the overview agency. The legislation also created the SWIM Trust Fund, to which appropriations will be made for support. The first year's appropriation of $15 million was allocated for six priority water bodies - four of which were estuarine waters, including Tampa Bay, during fiscal year 1988. Specifically, the legislation require three primary tasks of the SWEMff:): 0 preparation of a management plan for Tampa Bay; 0 undertake a data ccupilation project for the purpose of gathering all past and present information on Tampa Bay, storing it in one central location and providing all interested users with access to the data base; and 0 initiate a master water quality assessment of Tampa Bay. These were the only requirements contained within the legislation. The remaining tasks necessary to implement the legislation are left to the discretion of the SWETAND. These efforts shall be directed to improvements to water quality and natural systems around Tampa Bay and the proper management of the resources. In response to the legislative mandate, the swim staf f of the 94FvZM has completed the preparation of a comprehensive management plan to restore and preserve the Tampa Bay estuary. As identified within the document, entitled "S.W. I.M. Plan for Tampa Bay," the conservation and restoration of Tampa Bay will not be an easy task due to the size of the estuary (it is the largest open water estuary in Florida), and the longevity, perpetuation and severity of environmental problems. These environmental problems have resulted from the largely unchecked commercial, residential and industrial growth on or near the estuary over the last 150 years. Implementation of priority programs and projects from the S.W.I.M. Plan should speed the recovery of the Tampa Bay ecosystem. Improvements will be accelerated and increasingly measurable through the eventual implementation of the final (and annually updated) plan. The S.W.I.M. Plan represents a careful effort to balance needs and uses of the estuary with the needs of other plants and animals that also utilize the resource. Tampa Bay can be restored, but long-term maintenance at a productive, viable equilibrium will depend upon the cooperation of the public as well as local, regional, state and federal governments. The passage of the SWIM legislation comes at a time when Florida's local governments are preparing local comprehensive plans pursuant to Chapter 163, Part II, F.S. and Chapter 9J-5, F.A.C. Each local goverment comprehensive plan is required to be consistent with the appropriate regional policy plan and the State Comprehensive Plan. Pursuant to Chapter 9H-11, F.A.C., local plans will be reviewed by the appropriate regional planning council and water management district, as well as several state agencies. The review by the regional planning councils will be primarily in the context of the relationship and effect of the local plan or amendment on the adopted regional plan. The reviews by state agencies and the water management district will relate to their statutory responsibilities. The SWIM Act and the corresponding S.W.I.M. Plan represent the most recent statutory responsibility granted to the Southwest Florida Water Management District. The purpose of the Arplication. of the Tampa Bay Region's Comprehensive Reaional Policy Plan to the SWIM Plan for Tam:)a is to assist the District in its review of local plans, specifically through the identification of adopted goals and policies set forth in the Tampa Bay region's comprehensive regional policy plan, the Future of the Recrion, that are clearly related to the ten specific initiatives identified in the S.W.I.M. Plan. The identification of regional goals and policies will support and in many instances further the District's position on Tampa Bay management issues. Implementation of funded "special programs" by the TBRPC assist not only the Council in the development of review guidelines but also the local governments which make up the regional organization through the dissemination of innovative ideas and proactive planning. In addition, the implementation of the Growth Management Act will require consistency of local ccoprehensive plans with the State and Regional policy plans. The TBRPC plays a very active role with the newly formed SWIM program, through its Agency on Bay Management. The SWIM legislation noted that the Water Management Districts should consider the appointment of advisory councils for the surface water bodies identified as priorities. The Southwest Florida Water Management District requested that the Executive Steering Committee of the Taurpa Bay Regional Planning Council's Agency on Bay Management act as its Advisory Council for the Tampa Bay Priority water body. The District recognized the collective experience and expertise of the assembled members and the history of the Agency in dealing with bay management issues. This Advisory function will aid the District in the design, planning, and implementation of programs and projects through the SWIM Program. Program Evaluation The TanW Bay Regional Planning Council does not have specific legislative authority to regulate stormwater management in the region. However, the Council does play a significant role in the region within the following areas: 0 Reviews of Developments of Regional LTpact 0 Czimprehensive Planning 0 Intergovernmental Coordination and Review (enviromental assessments, dredge/fill applications, feasibility studies) 0 Grant ad-ninistration 0 TBRPC Agency on Bay Management Activities acccmplished by the TBRPC must be evaluated for consistency with Council policies included within the Future of the Region, Ccnwrehensive Reaional Policy Plan for the Tamj)a Bay Region. However, numerous mechanisms exist to evaluate Council policies, with TBRPC approval, and adopt new policies to reflect new technologies or reccirmendations. The process is currently being accomplished by the Council's Agency on Bay Management with respect to wetland management strategies. Review of existing TBRPC stormwater policies identify significant, proactive criteria currently being implemented by the TBRPC which further current state requirements. These policies include: 8.8. REGIONAL GOAL: BY 1995, EXISTING DEVELOPMENTS WILL BE REQUIRED TO MAKE MEASURABLE PROGRESS TOWARD MEETING STORM14ATER STANDARDS. 8.8.1 Poli Local governments should upgrade or retrofit drainage systems in urbanized areas to include stormwater treatment for water quality. 8.8.2 Poli If onsite detention is not feasible, scme payment in lieu of detention shall be made to local governments for construction of a regional stormwater facility within that drainage basin. 8.8.3 Policy: Redevelopment projects, irrespective of previous impervious cover, shall provide or support stormwater improvements within the affected drainage basin. 8.8.4 Poli : Agricultural runoff shall be handled with Best Management Practices to minimize its impact upon receiving waters. The Growth Management Act of 1985 requires consistency with Regional policies and eventual implementation on the County local goverment level. Maintenance of the Tampa Bay Regional Planning Council goals and policies to protect surface water resources is essential for continued overview management of the TBRPC. Specifically, control of stormwater regulation in the Little Manatee River drainage basin is best accorrplished through implementation of the Hillsborough County Ccuprehensive Plan - Unincorporated area review (see following county discussion) and evaluation of DRIs affecting the study area. Existing Council policies appear to be appropriate for maintenance of surface water resources given the limited regulatory responsibilities and existing state rules and regulations. Reccmendations Priority should be given to the maintenance and strengthening of Council review policies for management of stormwater runoff. This can be accomplished, and is recommended by periodic review of federal and state rules and regulations governing nonpoint source pollution and inclusion of appropriate policies into the Future of the Eggion, Ccimrehensive RecTional Policy Plan for the Tampa Bay Region. Updating of the Council's review document will support the implementation of appropriate policies and regulation by local governments, the Council can further ensure implementation through review of land use change applications by local governments. The Tampa Bay Regional Planning Council should additionally support development of a stormwater management plan for the Little Manatee River drainage basin by SWFME:). With the urban changes expected to occur within the watershed, the time is appropriate to establish site specific requirements for the basin. Previous studies have been oriented toward fixing problematic watersheds, whereas current analysis of the Little Manatee River basin can be used to prevent similar perturbations. It is anticipated that the ongoing program created by the Florida Department of Environmental Regulation (with C2M support) for the Little Manatee River basin will provide cl significant data base and management framework for stormwater control. The Council's Agency on Bay Management will provide vital support for any stormwater management master plan created for the basin. This alliance of experts and involved agencies can provide significant expertise and site specific information. Both the Council and the Agency will promote and coordinate with 94EWmD the dissEmination of information to other local governments who would benefit from a master plan for the basin. The Tampa Bay Regional Planning Council should additionally participate in the identification of problematic areas. DRI review can assist the identification and implementation of mitigative strategies. The use of Geographic Information Systems (GIS) by the Council to query natural and abiotic resources will facilitate identification and information transfers between interested parties. Ultimately site-specific information will provide the necessary format for identification and resolution of problematic areas. Finally, the Council should take an active role in the review of regulations governing stormwater regulation in the region similar to the current study. Numerous individuals, during the review process, have identified the vast number of regulations and agencies involved with stormwater management. Coordination through the DRI process can benefit applicants by providing requirements up-front. The Council can provide a useful forum for the standardization of rules and regulations to apply. Streamlining the regulatory process, through standardization, will reduce regulatory responsibilities and save time and expense for the applicant. V. HILLSBOROUGH COUNTY County Stormwater Reauirements Stormwater management is additionally accomplished by local governments, but not to the degree required by state agencies. Hillsborough County currently has a very active stormwater program and anticipates increasing responsibility through delegation of authority. Currently, Hillsborough County participates in stormwater analysis through the Development Review Department. Authority is gained by Chapter 125, Florida Statutes (1979), and Chapter 163, F.S. (1987) with the ordinance entitled "Site Development Regulation of Hillsborough County." The ordinance is constructed to govern development within unincorporated Hillsborough County and is managed under the County Administrator. The process is initiated upon submittal of an application for development to the Development Review Department. The plans are distributed to the various departments of the County for review. Upon ocirpletion of plan reviews by the different departments, the application goes before the Development Review Panel for approval or correction. Construction plan approval is finally forwarded to the County Commission for adoption. Stormwater requirements are submitted to two separate entities, the Planning and Zoning Department and the Environmental Protection Commission of Hillsborough County. Water quality considerations are addressed by the Environmental Protection Commission (EPC) of Hillsborough County. The EPC functions under a separate set of guidelines than the County, but participate with the Development Review Department. The EPCIs review function for water quality is currently limited and requires that the applicant receive a SWFWMD surface water management permit prior to approval by EPC. Additional ancillary requirements of EPC is included in Appendix D. The Planning and Zoning Department requires additional levels of protection for stornwater quantities. The County ordinance contains the following differences from Chapter 40D-4, F.A.C. (SWFWMD requirements): 1. The WMD requires runoff from the post-development 25-year storm event cannot exceed the 25-year predevelopment, rate of discharge, based upon an instantaneous peak rate of flow. Hillsborough County furthers 40D-4 by requiring that run-off from a post- development 25-year storm event cannot exceed runoff from the pre- deve.lopment 10-year storm event rate. 2. The County requires additional storage capabilities through freeboard designs. This is accomplished by requiring one foot of additional storage capacity from the design high water line to the top of berm. The freeboard requirement is to provide an additional level of protection from potential floodwaters. 3. Chapter 40-D-4 allows full credit for water quality treatment volumes toward quantity treatment volumes. The County ensures additional floodwater control by only allowing quantities of water discharged within 24 hours as storage quantities, termed water quality abatement quantity. 4. The County, additionally uses site specific information to identify watersheds which are "peak sensitive" and "volume sensitive.,, a. Volume sensitive areas are waterbodies which are land-locked with no outfall. The County requires the volume difference between pre- and post-development must be retained on-site for a 100-year storm event. Discharge occurs through percolation or evaporation within 72 hours; or, detain 100- year volume and discharge at a rate of one inch in 24 hours. b. Peak sensitive areas are waterbodies containing an outfall but are highly susceptible to flooding due to inability of -the outfall to discharge runoff volumes. Using site specific watershed analysis, the 25-year storm design capacity is determined at the point of a proposed development within the watershed. Since the development location is a portion of the total watershed to this point, the development is allowed to discharge its percent share up to the 10-year predevelopment runoff quantity of the watershed at the specific discharge location. This ensures management of floodwaters on the development property from cumulatively impacting waterbodies with inadequate outfalls. The application of requirements which further Chapter 40D-4, F.A.C. by the County promotes the use of site-specif ic information to prevent water quantity perturbations. Historic flooding problems experienced in the County point to the need for additional regulations and improvements to be applied at existing problematic areas. The County does not currently have any requirements specifically for the Little Manatee River basin. CcmT)rehensive Plannina Process As required by the Growth Management Act of 1985, Hillsborough County has currently completed the Comprehensive Plan (draft) for review under Chapter 9J-5, F.A.C. Requirements of the Growth Management Act are described under the T&rpa Bay Regional Planning Council discussion of this report. The conservation and aquifer recharge section of the Hillsborough County (unincorporated area) Ccoprehensive Plan identifies specific requirements for surface and groundwater protection through stormwater management. Objectives and policies from the Comprehensive Plan (dated February, 1989) include: Oblective By 1995, all the water quality of natural surface water bodies in Hillsborough County which do not meet or exceed State water quality standards for their designated use shall be improved or restored. Policy 2.8: By 1995, the County shall initiate an interlocal agreement with appropriate regulatory agencies to ensure the development of a nutrient monitoring and control program for those land uses which are located adjacent to surface water bodies and which contribute significant nutrient loadings. Where economically feasible, the program shall require the implementation of Best Management Practices (BMP's) for controlling nutrient loadings, including retrofitting if needed to meet specific alternative criteria as established by the SWIEM Program. Policy 2.9: The County shall cooperate with local and State agencies to improve monitoring and compliance enforcement of point and non-point source discharges. Policy 2.10: By 1991, the County shall require that existing developments planned for expansion, modification or replacement provide or support stormwater treatment improvements within the affected drainage basin where treatment facilities are lacking. Where feasible, the County shall require retrofitting of stormwater treatment facilities in urbanized areas lacking such facilities. Policy 2.11: The County shall monitor emerging stormwater treatment technology and Best Management Practices (EMP's) and shall cooperate with the Southwest Florida Water Management District to ensure that water quality objectives are met through the most appropriate and effective methodologies. Policy 2.12: The County shall prcmote a public education program, aimed at residential haneowners, which addresses the surface water quality impacts of improperly managed lawn litter and fertilizer/herbicide/pesticide applications. Objective 3: There shall continue to be no net loss of natural wetland acreage authorized in Hillsborough County. Upon plan adoption, the County shall seek to achieve a measurable annual increase in restored wetland acreage. By 1995, the County shall achieve a measurable annual increase in restored wetland acreage, through the restoration of degraded natural wetlands, until all econcmically and biologically feasible wetland restoration is accomplished. Policy 3.5: By 1990, the County shall actively pursue alternative means of financing surface water quality improvements and wetland restoration projects, including but not limited to: federal and state grant programs, low-interest loans, special local revenue districts and private sector contributions, wh ere appropriate. Policy 3.6: The County shall, through the land development review process and in cooperation with the Southwest Florida Water Management District, continue to promote the use of desirable native wetland plant species for the creation of wetland habitat and for biologically enhancing filtration and treatment of pollutants in newly constructed stormwater retention and detention ponds. Policy 3.8: The County shall cooperate with the Southwest Florida Water Management District to ensure that minimum freshwater flows are scientifically determined and maintained to support natural optimal diversity and productivity in estuarine wetlands. O&JECTIVE 4: The County shall continue to prevent net loss of 100-year floodplain storage volume in Hillsborough County. By 1995, the County shall protect and conserve natural wildlife habitat attributes where they exist within the 100-year floodplains of major rivers and streams. Policy 4.1: By 1995, the County shall, in consultation with the Southwest Florida Water Management District, amend floodplain management regulations to set forth measures and procedures which not only protect natural floodwater assimilating capacity but also protect fish and wildlife attributes where they exist within the 100-year floodplains of riverine systems. Policy 4.2: The County, through the land planning and development review processes, and in cooperation with EPC, shall continue to prohibit unmitigated encroachment into the 100-year floodplain of riverine systems. The County proposes several areas of improvement for stormwater management. LTprovEments include the development of a nutrient monitoring and control- program, retrofitting of urbanized basin and preservation of the 100-year floodplain. Tb implement the proactive programs the County is pursuing a Stormwater Utility Fee based upon the existing amount of impervious surface within a development. The proposed user fee has the added benef it of supporting the reduction of impervious surface to reduce imposed charges. The intent of the Stormwater Utility Fee is for maintenance, planning and design of existing problematic systems, and is not anticipated to affect new development. The County within its comprehensive plan, will create criteria for stormwater level of service. The following information was provided in the February, 1989 Comprehensive Plan: 1.C.l.b County Stormwater Manacrement Systems: The adopted level-of -service standards for a subbasin's major stormwater conveyance system, which includes significant canals, channels, ditches, pipeline/culvert enclosures of open systems, and appurtenant structures at crossing/control points, are as follows: l.C.l.b.(l) The adopted Level of Service standard for any system is -Ehe particular system's existing level-of -service until such time that the system is physically upgraded to its adopted intermediate or ultimate Level of Service standard. The physical upgrading of the systems to the higher Level of Service standards will be acccmplished by correcting the identified system deficiencies in accordance with the Stormwater Management Capital Rnprovements Program. l.C.l.b.(2) The target-level for the ultimate Level of Service standard, relative to all major stonTwater conveyance systems, is the 25-year/24 hours/B level. This level corresponds to that presently required to be provided by new development, except that a greater freeboard is additionally required of new development. However, occasionally physical and/or environmental constraints will not allow an existing system to be modified to the target- level. In such a case the adopted ultimate Level of Service standard is/will be the highest achievable Level of Service, as determined by a Stormwater Management Master Plan (RVP) study, below target-level. l.C.l.b.(3) The adopted ultimate Level of Service standard for a major County stornwater conveyance system which discharges into a City of Tampa stormwater conveyance system is the 5-year/24 hour/B level. This standard is based on the City's adoption of a 5- year/critical duration/B Level of Service standard for its systems, and the general location of the City between portions of the County and Tampa Bay. However, in those areas where the City intdnids to improve the system to a higher Level of Service, the County will adopt a corresponding higher Level of Service standard, up to the ultimate target-level. 1. C. 1. b. (4) The target-level for the intermediate Level of Service standard, relative to major stormwater conveyance systems, is the 10-year/24 hour/B level. However, if a system's adopted ultimate Level of Service standard is less than or equal to the 10-year/24 hour/B level, the appropriate intermediate Level of Service standard for the system will be the same as the adopted ultimate Level of Service standard for the system. Also, if all identified system deficiencies must be corrected in order for the system to provide at least the 10-year/24 hour/B Level of Service, the adopted intermediate and ultimate Level of Service standards for the system will be the same. 1.C.1.b.(5) The adopted intermediate and ultimate Level of Service standards, for the major stormwater conveyance systems located within the areas for which ccimpleted SIVITs currently exist, have been identified in the SMMP studies themselves and are discussed in the section "Future Conditions and Standards" of the Stormwater Element. These systems will be upgraded to their intermediate Level of Service standards via the FY90 - FY94 portion of the SMCIP, and to their ultimate Level of Service standards via the FY2001 - FY2010 portion of the 24CIP. The areas for which SMMPs currently exist are: � -Archie Creek Subbasin � Buckhorn Creek Subbasin � Curiosity Creek Subbasin � Delaney Creek Subbasin � Delaney Creek Popoff Canal Subbasin � Duck Pond Watershed � Nine Eagles Branch (of Double Branch Creek Watershed) 0 North Archie Creek Subbasin � Raintree Area Subbasin � Rocky Creek Subbasin � Sweetwater Creek Subbasin l.C.l.b(6) The adopted intermediate and ultimate Level of Service standards, for the major stormwater conveyance systems located outside for the areas for which completed SMMPs currently exist, have not been determined. These standards will be established via the comprehensive Stormwater Management Master Planning program to be conducted as part of the FY90-FY94 portion of the SMCIP. Def icient systems will then be upgraded to their adopted intermediate Level of Service standards via the FY95 - FY2000 portion of the SMCIP, and to their adopted ultimate Level of Service standards via the FY2001-FY2010 portion of the SMCIP. The adopted Level of Service standards for other types of stormwater management facilities are as follows: -0 Storm sewer/swale collection system (minor stormwater conveyance system) designed/constructed prior to 1981- standard = existing Level of Service; standard target level = 3-year/critical duration/A level for those systems in need of improvement due to documented poor physical performances, after FY89, which result in flooding at levels C or D during storms less than or equal to the respective target-level event. � Storm sewer/swale collections system (minor stormwater conveyance system) des igned/oonstructed during or after 1981 - standard - 3-year/critical duration/A level. � Stormwater detention pond/lake/storage area designed/constructed prior to 1981 and all stormwater retention systems -standard = existing Level of Service for both retention and detention systems; standard target-levels 25-year/24 hour/A (detention systems) and 100-year/24 hour/A (retention systems) for those systems in need of improvement due to documented poor physical performances, after FY89, which result in flooding at levels C or D during storms less than or equal to the respective target-level events. � Stormwater detention pond/lake/storage area designed/constructed during or after 1981 - standard 25-year/24 hour/A level. As for major stormwater conveyance systems, occasionally physical and environmental constraints will prevent the upgrading, when necessary, of a facility to its appropriate target-level. In such cases, the facility will be upgraded to the highest achievable Level of Service below the corresponding target-level. The Level of Service provision will ensure maintenance of minimum requirements for stormwater management. The results of level of service criteria will be tied directly to allowable development and available funds for watershed improvements and system maintenance. Evaluation and Recamendations Hillsborough County participates in stormwater management regulation, to a degree. The Planning and Zoning Department support stormwater quantity requirements of Chapter 40D-4, F.A.C. and further regulation with site specific requirements. water quality considerations are accepted by the County when the applicant received a surface water permit from SWFWMD. However, significant steps can be taken by the County to enhance stormwater/control. Land use regulation often carry the tools necessary to prevent perturbations. The County currently enforces an ordinance to prevent no net loss of the 100-year floodplain. Retention of 100-year flood storage capacity prevents flood conditions. The County should additionally consider preservation of natural systems within the 100-year floodplain to buffer water quality problems through retaining wetland and transitional upland plant species. The use of density transfers can provide incentives for developers to preserve sensitive areas. Transfers of development rights from fioodplains acreage will concentrate development away from wetlands and buffer zones. Hillsborough County has initiated the Endangered Land Acquisition and Parks Programs (ELAPP) for purchase of sensitive lands through overwhelming approval of a property tax referendum. Lands considered for public purchase include riverine floodplains and coastal marsh systems. Land acquisition programs are highly supported to ensure long term protection and allow restoration of lands with public resources. Keystone wetlands and additional riverine corridors should be prioritized for purchase by the County or with state (Conservation and Recreational Lands (CARL) Program) or regional (Save Our Rivers) support. Land acquisition can additionally be used for areas in need of stormwater improvements. Borrow pits could be tied into problematic tributaries to prcmote flood attenuation or pollutant removal through sedimentation. As reconstruction occurs, public land purchase will beccme necessary to acquire lands for stormwater treatment. Land acquisition could easily be a major ccoponent of future stormwater renovation projects in developed areas. The County should consider lands previously acquired for recreation as potential stormwater treatment facilities. Parks can provide multi-use facilities during rain events. Softball/soccer fields can serve as dry detention areas for water quality, or tributaries can be al lowed to overflow into special recreational fields to provide storage capacities. As previously suggested, the County is initiating the delegation of authority for stornwater permitting. Hillsborough County must first ensure its ability to evaluate water quality maintenance in addition to quantity considerations. The obvious agency to regulate water quality is the Environmental Protection Ccm-nission of Hillsborough County. It will be necessary to include quantity and quality responsibility within one County department to ensure consistency and consider the "big picture" of stormwater management, which includes: quality and quantities; wetland management; aquifer recharge; and maintenance of natural comunities. The implementation of a Stormwater Utility Fee will initiate the generation of funds to properly manage stormwater, over a long-time frame. This action will be of significant importance if the County intends to accept stormwater permitting authority. In addition, maintenance of existing systems is, required to ensure accurate operation and reconstruction of problematic system. The utilities fee can eventually support one agency (i.e.: Hillsborough County) responsible for all maintenance within a jurisdiction. Piece-meal maintenance is ineffective compared with regional system and maintenance programs. The user fee will promote rehabilitation of problematic areas to irnprove stormwater quality and quantity. The first step toward retrofitting should include requiring all redevelopment projects, irrespective of previous cover, to came into ccopliance with stormwater regulations at the time. Measurable progress should be achieved by placing storrrwater ccmpliance on redevelopment, and public programs to enhance problematic areas. Hillsborough County should additionally take the lead to require agricultural activities conform with stormwater regulations; or at a minimum, best management practices applied to all agriculture, 8ilvaculture, aquaculture activities to reduce pollutant loadings around the County. Palmer and McClelland (1988) identified that "significant improvements in the chlorophyll-a concentration was predicted for Hillsborough Bay when agricultural and urban BMP's were considered" in the Tampa Bay water quality model simulations. The Future of Tampa Bav.(TBRPC, 1985) identified stormwater runoff as the major sources of water pollution in Tampa Bay. The significant quantities of agricultural loadings to surface water bodies cannot continue to remain unregulated. Hillsborough County can and should address the agricultural problem upon delegation of authority by the SWFWMD. Progress will not be achieved overnight but can be started by the development of a information/education program to identify EMP's and the benefit to agriculture industry. In addition, Hillsborough County should co-sponsor the development of a stornwater master plan for the Little Manatee River watershed with SWFM.E:). The master plan can be structured to proactively plan for the protection of existing natural systems and ccumunities and restore degraded areas and functions. The Little manatee basin requires a total watershed analysis before significant development occurs within the watershed. The Comprehensive Planning process will provide the guiding framework for growth and development in Hillsborough County. Careful evaluation of goals and eventual implementation of the comprehensive policies is .essential to ensure protection of natural resources during the orderly expansion of growth within Hillsborough County. State and regional agencies currently contain the authority to regulate stormwater controls. Local governments, however, contain the tools to implement land use decisions which ultimately directly affect stormwater management. Delegation of authority to local governments, which further state requirements, can provide a comprehensive regulation framework for stormwater management. VI. STORMWATER MANAGEMENT RECCU24ENDATIONS During the interview process, area representatives were asked about improvements needed in regulation, design and campliance. Significant recammendations on all aspects of stormwater management warranted a special section devoted to stormwater system analysis, the retrofitting issue and land use mechanisms. The analysis is intended for general discussion and is not oriented toward a particular watershed or jurisdiction. Stormwater System Analyses The majority of individuals recammended the use of wet detention systems to treat stormwater runoff. Primary advantage include the low maintenance required after construction and the added benefit of providing wetland habitat. Endangered species can benefit by the design of biological treatment system to supplement habitat needs on-site. one example is use of wet detention systems by wood storks (Mvcteria americana) for foraging, a cmmon occurrence in the Tampa 13ay region. Design of wet detention systems incorporating littoral shelves, near wood stork roosting areas will provide habitat for endangered species while ensuring water quality treatment. Filtration stormwater systems were identified as not effective in treating runoff, however. Filtration systems design is considered workable but not practical since actual construction often varies from intended design. The filtration media ccumnly beccmes clogged and requires high maintenance to maintain the discharge. Since many governments are responsible for drainage maintenance, systems requiring minimal maintenance are strongly encouraged. Additionally, filtration systems do not provide the habitat ocniponents of wet detention. The use of silt screens and hay bales to control erosion and turbidity has received little support from representative stormwater managers. Again, the issue is maintenance. The silt screens and hay bales are effective, if installed properly. However, after storm event- blowout of the screen or bales allows erosion and sedimentation to occur. If the screens or bales are not reinstalled properly the problems will continue with each successive storm. A required periodic examination and maintenance program is essential if silt screen and hay bale lines are included in permit requirements. Several new approaches to manage stormwater were identified during the interview process. Extended detention systems are reccmmended to allow additional pollutant removal to occur through sedimentation, biological assimilation and deccniposition. By detaining runoff over longer periods of time, degradation and consumption of the majority of oxygen demanding substances within the stormwater treatment facility occurs before discharge into state waters. Another approach which warrants future evaluation includes the construction of high flow/low flow treatment facilities. During normal rainfall events (under one inch) the runof f is channeled into one treatment system capable of handling the design storm. Storm events generating a greater amount of runoff would "pop-over" to another treatment facility to handle the excessive quantities of rainfall generated by the storm. This system prevents a concentrated slug of runoff carrying the pollutant load through the stormwater facility during extreme storm events. The high f low1low f low facility can be additionally applied to mixed use treatment facilities; as previously mentioned. The playing fields (football, soccer) could serve as the high f low treatment area The application of grassed swales to divert and treat runof f can provide walkways or terraces along playing fields. Further evaluation of mixed use systems with special consideration to urbanized areas is reccomended. Numerous individuals have suggested multiple layers of treatment before discharge to state waters. A chain of lakes will promote water quality within ei@ch successive lake system. The outfall of a treatment facility into wetlands will provide another polishing treatment stage. The same concept can be applied to bleed down quantities f lowing through a drainfield for further filtration. Flocculants can be used in stormwater control facilities to assist in settling out suspended matter and potential pollutants. Flocculants aid runof f water quality improvement by causing materials to adhere together and settle out of solution at an accelerated rate. Since many potential pollutants attach to suspended particles (i.e.: metals, hydrocarbons) the act of combining particles to promote sedimentation can accelerate pollutant removal from the water column. The process of flocculation has a great potential in urban areas with limited area for stormwater treatment ponds where water quality treatment before discharge to surface waters is required. Irrespective of stormwater treatment facility design, considerations should take advantage of existing features on-site. Thpography should be maintained for stormwater controls to mimic existing flow patterns and drainage basins. Areas of high recharge to aquifer systems can consider dry detention to facilitate recharge capabilities of the property. As previously, mentioned enhancing habitat for listed species through development of littoral shelves and drawdown pools within treatment ponds will support objectives to improve listed species populations. Wetlands identified for preservation can be used as a polishing stage for storMwater effluent after treatment, or for rehydration of previously impacted systems. Stormwater managers and consultants need to consider the ecosystem approach in the design of stormwater management facilities. Programs such as this analysis should assist in identifying design alternatives and proactive planning. Retrofittina Existina Develor-me Future consideration of improvements to surface water bodies must implement programs applying stormwater management practices to previously developed areas. Retrofitting, or rehabilitating developed areas, is the process of implementing management of stormwater in areas which were developed previous to stormwater regulation and can include either water quantity or quality. Runoff from developed areas continues to provide significant pollutant loadings to surface water resources. However, point source loadings from WWTP effluents, industrial discharges and others are quantifiable due to the existing permitting process. Loadings from stormwater runoff are not as identifiable since stormwater ccxnes from a wide variety of sources and locations. General analysis can occur from ditches, culvert or tributary evaluations where the sources are cumulatively tabulated. Two of the more comprehensive analysis of stormwater runoff loadings are the ongoing analysis of the Little Manatee River and the National Urban Runoff Program (NURP) accomplished for the Hillsborough River during the 1970's. What information is available identify urban and agricultural runoff as the major sources of water pollution in Tampa Bay (TBRPC, 1985). Since new development must conform to existing regulations, any net improvements to surface water bodies will require enhancement of older development. Retrofitting should be applied evenly to urban and agricultural areas. Urban centers may prove to be the most difficult and expensive areas in which to improve runoff conditions. Land acquisition prices are high, with new development often seeking to replace or inf ill older areas. In addition, pollutant loadings tend to be higher in the urban core due to the intensive development and quantities of impervious surface. Ideally, innovative techniques to utilize available lands will be required for urbanized areas. Research and model programs for urban retrofitting is reccomended for the State 205(j) program and SWIM program) and local agency consideration. Retrofitting of existing uses and application of rules and regulations to new developments is vital for any expected water quality, and other associated benefits, to be achieved in surface waterbodies and the Tampa Bay estuary (Figure 3). Agricultural activities continue to evade most environmental regulations. Regulations not applied to agribusiness development include consumptive water uses and wetland modifications in addition to stormwater management. Existing stormwater practices can easily be applied to agribusiness areas. The open land is more conducive for application of prevailing technology. However, the land is primarily in privat@ ownership and may require assistance and incentive programs for successful implementation. Future legislation will consider and potentially adopt requirements for retrofitting. Since the reconstruction of runoff control is expected to require a long-term ccmitment of financial support for improvements, a well defined plan of implementation is necessary. The TRENDS IN STORMWATER RUNOFF QUALITY 'GOOD' EXISTING NO WATER GUALITY REGULATIONS >- REGULATIONS. w!: LU-j MiL 00 WITH RETROFIT 1--Z con Ix NO RETROFIT-17 .POOR"I 1820 191,82 1988 TIME (YEAR) FLIME Florida Land Design & Engineering, Inc. FL 10 L@@@F Figure 3. Trends in Stormwater Runoff Quality. first objective will be to inventory existing conditions of a watershed, which can include: 0 watershed limits 0 land use 0 water conveyance features, and 0 loadings at particular points into the systems Identification of loading rates within the system will help to establish priorities for improvement. Identifying priorities will not only require consideration of pollutant loadings, but also financial requirements to achieve load reductions. A balance must be achieved between capital outlay and net improvements. Additionally reducing nutrient loads into areas with little circulation may achieve a greater benefit than removing the same load from areas with good flushing. Guidelines for improving storrrwater quality should be developed between multiple agencies for distribution over a statewide basis. Public education is necessary to identify long term requirements. Developed areas can be upgraded for compliance on a price-meal basis, with net miprovements achieved over time. Requiring all redevelopment to conform to stormwater requirements in addition to retrofitting will provide parallel programs to facilitate stormwater management for all areas. Little-by-little, area-by-area, progress can be achieved to protect natural ccmunities from perturbations created by stormwater runoff. A vital component of early retrofitting projects will be monitoring of results, especially innovative systems. Retrofitting projects will provide baseline information on successes -and failures which be applied to future projects. Design construction techniques and monitoring results should be distributed between state agencies and local govermnents. Regional Planning Councils can share in the collection and distribution of stormwater management information. Ixand Use Practices Land use decisions affect alteration of land to allow development. Stormwater can be managed through the use of land use regulations to prevent unintentional impacts to surface water resources. Water quality treatment, in a sense, can be acccuplished through density controls. Less intensive developments do not require the degree of impervious surfaces, thus allowing natural maintenance of water conditions through percolation, evapotranspiration and wetland assimilation. Transfer of density alternatives will promote protection of natural water conveyance and treatment. Concentrating development away from tributaries, wetlands and significant upland features buffer water quality and habitat benefits. The 100-year floodplain is reccomended for preservation as one ecological unit, by providing water conveyance, wetland camunities, and upland transitional buffer zones. Land use decisions can be applied by local governments to condemn lands required for stormwater treatment. The taking of lands should only be accomplished for public use after avenues for just ccmpensation. have been explored. Lands could also be traded to provide sufficient area for treatment. Local governments also have the flexibility to develop land use criteria for impervious surfaces. Not all parking lots need to be impervious, as an example. Criteria development will prcmote awareness to alternatives for impervious surfaces, in addition to requiring coupliance with requirements. Development of stormwater management plans may identify regional management facilities, thereby providing the potential for greatest treatment for the largest area. Existing borrow pits can potentially be tied into tributary systems for large settling basins. Many large borrow pits in south Hillsborough County receive agricultural runoff fram ditches in the area and provide significant informal treatment. Additional evaluation and identification of regional systems is necessary. APPENDICES I APPENDIX A. Florida Department of Environmental Regulation Chapter 17-25, F.A.C. Regulation of Stormwater Discharge DER 1986 REGULATION OF STORMWATER DISCHARGE 17-25 CHAPTER 17-25 REGULATION OF STORMWATER DISCHARGE 17-25-001 Scope. 17-25.020 Definitions. 17-25.02S Design and Performance Standards. 17-25.027 Legal Operation/ Maintenance Entity Requirements. 17-25.030 Exemptions. 17-25-03S Stormwater General Permits. 17-25.040 Construction Permit Requirements for New Stormwater Discharge Facilities. 17-25.042 Permit Requirements for Wetlands Stormwater Discharge Facilities. 17-25.050 Delegation. 17-25.060 Relationship to Other Permitting Requirements. 17-25.07 Transferability of Other Chapters. (Repealed) 17-25.080 General Provisions. 17-25.090 List of Entities to Which Permitting Pursuant to this Chapter has been Delegated; Addresses; Delegation Documents and Rules Adopted by Reference. 17-25.10 Effective Date. (Repealed) 17-25.001 Se". (1) The discharge of untreated stormwater may reasonably be expected to be a source of pollution of waters of the state and is, therefore, subject to Department regulation. The Department shall prevent pollution of waters of the state by discharges of stormwater, to ensure that the designated most beneficial uses of waters, as prescribed by Chapter 17-3, Florida Administra- tive Code, are protected. (2) A permit under this chapter will be required only for new stormwater discharge facilities as defined herein. This provision shall not affect the Department's authority to require appropriate corrective action, pursuant to Sections 403.121 - 403.161, Florida Statutes, whenever existing facilities cause or contribute to violations of state water quality standards. (3) Stormwater discharges to groundwaters shall be regulated under the provisions of Section 17-4.24S, F.A.C. and other applicable rules of the Department. (4) Thd-Department intends that, to the greatest extent practicable, the provisions of this chapter be delegated to either local governments or water management districts seeking such delegation. Specific Authority: 403.061, F.S. Law Implemented: 403.021, 403.061, 403-101(l), F.S. History: Formerly 17-4.248, Amended and Renumbered 2-1-82, Amended 1-26-84. Previously numbered as 17-25.01. 17-25.020 Definitions. (1) "Artificial Watercourse" means a man-made waterway that was totally dredged or excavated prior to October 1, 1984 and which connects formerly 17-25-001(l) -- 17-25-020(l) 05-14-86 DER 1986 REGULATION OF STORMWATER DISCHARGE 117-25 isolated, nonjurisdictional wetlands to other waters. The Department shall bear the burden to show that such artificial watercourse was not totally dredged or excavated or that the connected wetlands were formerly jurisdictional. (2) "Completion of Construction" means the time at which the stormwater discharge facility is first placed into operation or when the project passes final building inspection or when the project receives a certificate of occupancy, whichever comes first. (3) "Conservation Plan" means a formal document, prepared or approved by a local Soil and Water Conservation District Board organized pursuant to Chapter 582, Florida Statutes, which outlines a system of management practices to control soil erosion, reduce sediment loss or protect the water quality on a specific parcel of property. (4) "Construction" means any on-site activity which will result in the creation of a new stormwater discharge facility, including the building, assembling, expansion, modification or alteration of the existing contours of the property, the erection of buildings or other structures, or any part thereof, or land clearing. (5) "Detention" or "To Detain" means the collection and temporary storage of stormwater in such a manner as to provide for treatment through physical, chemical, or biological processes with subsequent gradual release of the stormwater. (6) "Engineer" means a Professional Engineer registered in Florida, or other person exempted pursuant to the provisions of Chapter 471, Florida Statutes, who Is competent in the fields of hydrology and stormwater pollution control. (7) "Effective Grain Size" means the diameter of filter sand or other aggregate that corresponds to the 10 percentile finer by dry weight on the grain size distribution curve. (8) "Filtration or "To Filter" means the selective removal of suspended matter from stormwater by passing the water through at least 2 feet of suit- able fine textured granular media such as porous soil, uniformly graded sand and gravel, or other natural or artificial aggregate, which may be used in conjunction with filter fabric and/or underdrain pipe. (9) "Intermittent Watercourse" means a stream or waterway that flows only at certain times of the year, flows in direct response to rainfall, and is normally an influent stream except when the groundwater table rises above the normal wet season level. (10) "New Stormwater Discharge Facility" means a stormwater discharge facility which was not in existence on February 1, 1982, or for which a completed stormwater- discharge, dredge or fill, or other Department permit or license application had not been received before February 1, 1982, or an existing stormwater discharge facility which is modified, as specified in Section 17-25.040(3), Florida Administrative Code, on or after February 1, 1982. A storaiwater discharge facility approved or found to be exempt by the Department before February 1, 1982, or a facility which had been determined by the Department not to be significant pursuant to 17-4.248(5) before February 1, 1982, or a facility exempted pursuant to Section 17-25.030(2) shall not be 17-25.020(l) -- 17-25.020(10) 05-14-86 DER1986 REGULATION OF STORMWATER DISCHARGE 17-25 considered a new stormwater discharge facility unless modified pursuant to Section 17-25.040(3). (11) "Regional Stormwater Discharge Facility" means a stormwater dis- charge facility which is permitted pursuant to Section 17-25.040(6) and is designed and constructed to accept stormwater from multiple parcels within the drainage area served by the regional facility. Drainage area refers to the land or development that is served by and/or contributes stormwater to the regional facility. (12) "Retention" or "To Retain" means the prevention of, or to prevent the discharge of, a given volume of stormwater runoff into surface waters of the state by complete on-site storage* . (13) "Stormwater" means the flow of water which results from, and which occurs immediately following, a rainfall event. (14) "Stormwater Discharge Facility" means a stormwater management system which discharges stormwater into surface waters of the State. (15) I'Stormwater Management System" means the designed features of the property which collect, convey, channel, hold, inhibit or divert the movement of stormwater. (16) "Swale" means a manmade trench which: (a) has a top width-to-depth ratio of the cross-section equal to or greater than 6:1, or side slopes equal to or greater than 3 feet horizontal to 1 foot vertical; and, (b) contains contiguous areas of standing or flowing water only following a rainfall event; and, (c) is planted with or has stabilized vegetation suitable for soil stabilization, stormwater treatment, and nutrient uptake; and, (d) Is designed to take into account the soil erodibility, soil percola- tion, slope, slope length, and drainage area so as to prevent erosion and reduce pollutant concentration of any discharge. (17) "Uniformity Coefficient" means the number representing the degree of homogeneity in the distribution of particle sizes of filter sand or other granular material. The coefficient is calculated by determining the D601DIO ratio where D10 and D60 refer to the particle diameter corresponding to the 10 and 60 percentile of the material which is finer by dry weight. (18) "Waters" are as defined in Section 403.031(3), Florida Statutes. (19) "Wetlands" means, for the purposes of this rule, those waters which are dominated by those plant species listed in Section 17-4.020(IB) or Section 17-4.022, F.A.C. and which meet the conditions specified in Section 17-25.042(2), F.A.C* (20) "Wetlands Stormwater Discharge Facility" means a new stormwater discharge facility which incorporates those wetlands identified in Section 17-25.042(2), F.A.C. into the stormwater management system to provide storm- water treatment. Specific Authority: 403.061, F.S. Law Implemented: 403.021, 403.031, 403.061, 403.913, F.S. History: Formerly 17-4.248, Amended and Renumbered 2-1-82, Amended 3-30-82, 1-26-84, 5-8-85. Previously numbered as 17-25.02. 17-25.020(10) -- 17-25.020(History) 05-14-86 DER 1986 REGULATION OF STORMWATER DISCHARGE 17-25 17-25.025 Design and Performance Standards. The following design and performance standards are established for the purpose of determining compliance with this chapter, however, in some instances they may not result in compliance with water quality standards set forth in Chapters 17-3 and 17-4, F.A.C. No discharge from a stormwater discharge facility shall cause or contribute to a violation of water quality standards in waters of the state. Unless the applicant provides reasonable assurance that the discharge will not cause or contribute to a violation of water quality standards in waters of the state, the Department may require more stringent design and performance standards than are otherwise required by this chapter: (1) Detention basins shall again provide the capacity for the specified treatment volume of stormwater within 72 hours following a storm event. (2) Filtration systems shall have pore spaces large enough to provide sufficient flow capacity so that the permeability of the filter is equal to or greater than the surrounding soil. The design shall ensure that the particles within the filter do not move. When sand or other fine textured aggregate other than natural soil are used for filtration, the filter material should be of a quality sufficient to satisfy the following requirements: (a) Washed (less than 1 percent silt, clay and organic matter) unless filter cloth is used which Is suitable to retain the silt, clay and organic matter within the filter; (b) Uniformity coefficient 1.5 or greater; and (c) Effective grain size of 0.20 to 0.55 millimeters In diameter. These criteria are not intended to preclude the use of multilayered filters nor the use of materials to Increase !on exchange, precipitation or pollutant adsorp- tion capacity of the filter. (3) 'Filtration systems shall be designed with a safety factor of at least two unless the engineer affirmatively demonstrates based on plans, test results, calculations or other information that a tower safety factor is appropriate for the specific site conditions. Examples of how to apply this factor include but are not limited to reducing the design percolation rate by half, doubling the length of underdrain or designing for the required drawdown within 36 hours. (4) Retention basins shall again provide the capacity for the given volume of stormwater within 72 hours following the storm event. The addition- al storage volume must be provided by a decrease of stored water caused only by percolatiorL through soil, evaporation or -evapotranspiration. (5) Swales shall be designed to percolate 80% of the runoff from a three-year, one-hour design storm within 72 hours after a storm event, assuming average antecedent conditions. (6) Unless applicable local regulations are more restrictive, for purposes of public safety, permanently wet retention and detention basins shall either be fenced or otherwise restricted from public access or contain side slopes that are no steeper than 4:1 (horizontal: vertical) out to a depth of two feet below the control elevation. All side slopes shall be stabilized by either vegetation or other materials to minimize erosion and subsequent sedimentation of the basins. 17-25-025 -- 17-25.025(6) OS-11"6 DER 1986 REGULATION OF STORMWATER DISCHARGE 17-25 (7) Erosion and sediment control best management practices shall be used as necessary during construction to retain sediment on-site. These management practices shall be designed by an engineer or other competent professional experienced in the fields of soil conservation or sediment control according to specific site conditions and shall be shown or noted on the plans of the stormwater management system. The engineer or designer shall furnish the contractor with information pertaining to the construction, operation and maintenance of the erosion and sediment control practices. (8) Stormwater discharge facilities which receive stormwater from areas which are a potential source of oil and grease contamination in concentrations exceeding applicable water quality standards shall Include a baffle, skimmer, grease trap or other mechanism suitable for preventing oil and grease from leaving the stormwater discharge facility in concentrations that would cause or contribute to violations of applicable water quality standards in the receiving waters. (9) Stormwater discharge facilities which directly discharge to Outstanding Florida Waters shall include an additional level of treatment equal to fifty percent of the treatment criteria specified in Section 17-25.035(l)(b) or Section 17-25.040 or Section 17-2S.042, F.A.C. Specific Authority: 403.061, 403.912, F.S. Law Implemented: 403.021, 403.061, 403.101(l), F.S. History: New 1-26-84, Amended 3-28-84, 5-8-85. 17-25.027 Legal Operation/ Maintenance Entity Requirements. (1) The Department considers the following entities to be acceptable for meeting the requirements necessary to ensure that a stormwater discharge facility will be operated and maintained In compliance with the requirements of this chapter and other Department regulations: (a) local governmental units including counties or municipalities, or Municipal Service Taxing Units. (b) active water control districts pursuant to Chapter 298 Florida Statutes or drainage districts created by special act, or Community Develop- ment Districts pursuant to Chapter 190 Florida Statutes, or Special Assessment Districts pursuant to Chapter 170 Florida Statutes. (c) state or federal agencies. (d) duly constituted communication, water, sewer, electrical or other public utilities. (e) thi- property owner or developer is normally not acceptable as a responsible entity when the property is intended to be sold to third parties. However, the property owner or developer may be acceptable under one of the following circumstances: 1. Written proof in the appropriate form by either letter or resolution, that a governmental entity or such other acceptable entity as set forth in paragraphs (a)-(c) above, will accept the operation and maintenance of the stormwater management and discharge facility at a time certain In the future. 2. Bonding or other assurances sufficient to operate and perform anticipated maintenance on stormwater facilities. (f) profit or non-profit corporations including homeowners associations, 17-25.025(7) -- 17-25-027(l)(f) 05-14-86 DER 1986 REGULATION OF STORMINATER DISCHARGE 17-25 property owners associations, condominium owners associations or master associations shall be acceptable only under certain conditions that ensure that the corporation has the financial, legal and administrative capability to provide for the long term operation and maintenance of the stormwater discharge facility. (2) Entity Requirements. (a) if a Homeowner, Property Owner, Condominium or Master Association is proposed, the owner or developer must submit the Articles of Incorporation, Declaration, Restrictive Covenantsf Deed Restrictions or such other organiza- tionai or operational documents affirmatively taking responsibility for the operation or maintenance of the stormwater discharge facility. (b) the Association shall have sufficient powers reflected in its organi- zational or operational documents to: 1. operate and maintain the stormwater management system and the storm- water discharge facility as exempted or permitted by the Department. 2. establish rules and regulations. 3. assess members. 4. contract for services (if the Association contemplates employing a maintenance company) to provide the services for operation and maintenance. 5. the Association shall exist in perpetuity; however, If the Association is dissolved, the Articles of Incorporation must provide that the stormwater management system and discharge facility shall be maintenanced by an entity as set forth in paragraph (1) of this rule. (3) Phased Projects. (a) if an Operation/ Maintenance entity ts proposed for a project which will be constructed In phases, and subsequent phases will utilize the same stormwater management facilities as the Initial phase or phases, the entity shall have the ability to accept responsibility for the operation/ maintenance of stormwater discharge facility for future phases of the project. (b) if the development scheme contemplates independent operation/ maintenance entities for different phases, and the stormwater management system is integrated throughout the project, the entities, either separately or collectively shall have the responsibility and authority to operate and maintain the stormwater management system and discharge facility for the entire project. That authority shall include cross easements for stormwater management and the ability to enter and maintain the various facilities, should any sub-entity fail to maintain a portion of the stormwater management system or discharge facility within the project. (4) The applicant shall be an acceptable entity from the time construc- tion begins until the stormwater discharge facility Is dedicated to and accepted by an established legal entity pursuant to (1) above. The applicant shall provide proof of the existence of an entity pursuant to (1) above or of the future acceptance of the facility by an entity described in (1) above prior to initiating construction. (5) The provisions of this section shall become effective on October 1, 1985. Specific Authority: 403.061, 403-087, 403.088, F.S. Law Implemented: 403.021, 403.061, 403.087, 403.088, 403.182, F.S. History: New 5-8-85. 17-25.0270)(f) -- 17- 25.027 (History) DER 1986 REGULATION OF STORUWATER DISCHARGE 17-25 17-25.030 Exemptions. (1) The following types of new stormwater discharge facilities are exempt from the notice and permit requirements of this chapter: (a) facilities designed to accomodate only one single family dwelling unit, duplex, triplex, or quadruplex, provided the single unit, duplex, triplex or quadruplex is not part of a larger common plan of development or sale; (b) facilities which are designed to serve single family residential projects, including duplexes, triplexes and quadruplexes, of less than 10 acres total land area and which have less than 2 acres impervious surface provided that the facilities: 1. comply with all regulations or ordinances applicable to stormwater management and adopted by a city or county; and 2. are not part of a larger common plan of development or sale; and 3. discharge Into a stormwater discharge facility exempted or permitted by the Department under this chapter which has sufficient capacity and treat- ment capability as specified in this chapter and is owned, maintained, or operated by a city, county, special district with drainage responsibility, or water management district; however, this exemption does not authorize discharge to a facility without the facility owner's prior written consent; or 4. discharge Into a stormwater discharge facility which has sufficient capacity and Is part of a master drainage plan adopted by a city or county; however, this exemption does not authorize discharge to a facility without the facility owner's prior written consent. (c) stormwater discharge facilities whose functioning treatment compo- nents consist entirely of swales. However, this exemption Is valid only if the swale, as constructed, meets or exceeds the requirements specified in Section 17-25.020(16) and Section 17-25.025(5). (d) facilities which discharge Into a regional stormwater discharge facility which Is permitted pursuant to Section 17-25.040 where the appropri- ate treatment criteria specified in this chapter and applied to the permitted regional facility are met by the discharge; however, this exemption does not authorize discharge to the permitted regional facility without the facility owner's prior written consent. (e) facilities for agricultural lands, provided those facilities are part of an approved Conservation Plan; however, if the Conservation Plan is not Implemented according to its terms, this exemption shall be void; and (f) facilities for silvicultural lands, provided that the facilities are constructed and operated in accordance with the Silviculture Best Management Practices Manual (1979), published by the State of Florida, Department of Agriculture and Consumer Services, Division of Forestry, which Is adopted and made a part of this rule by reference. A copy of this manual may be obtained by writing the Department of Agriculture, Division of Forestry, 3125 Conner Boulevard, Tallahassee, Florida, and may be inspected at all Department of Environmental Regulation offices. 17-25.030(l) -- 17-25.030(l)(f) 05-14-86 DER 1986 REGULATION OF STORMWATER DISCHARGE 17-2S (2) Within the geographical area for which the Department has delegated stormwater permitting to the Southwest Florida Water Management District, the following types of new stormwater discharge facilities are exempt from the permitting requirements of this chapter provided that the owner files notice and an engineer certifies to the District, on forms provided by the District, at least 30 days prior to construction that the discharge facility will meet the criteria specified below, and provided that an entity responsible for operation and maintenance of the proposed facility has been determined. Furthermore, an engineer shall certify on forms provided by the District, within 30 days after completion of construction that the new stormwater discharge facility, as constructed, qualifies for exemption under this section. The District may require that the owner and engineer furnish appro- priate design analyses, calculations, drawings, specifications and other information to describe, verify and document that the proposed stormwater discharge facility qualifies for exemption according to this section. (a) facilities which discharge into a stormwater discharge facility which is permitted pursuant to section 17-2S.040 or exempt pursuant to section 17-25.030 where the appropriate treatment criteria specified in this chapter and applied to the permitted or exempt facility are not exceeded by the discharge; however, this exemption does not authorize discharge to permitted or exempt facilities without the facility owners prior written consent; or, (b) facilities which provide retention, or detention with filtration, of the runoff from the first one inch of rainfall; or, as an option, for projects or project subunits with drainage areas less than 100 acres, facilities which provide retention, or detention with nitration, of the first one half inch of runoff. However, facilities which directly discharge to Outstanding Florida Waters shall provide additional treatment pursuant to Section 17-25.025(9), F.A. C.; or, (c) modification or reconstruction by a city, county, state agency, special district with drainage responsibility, or water management district of an existing stormwater management system which is not intended to serve new development, and which will not increase pollution loading, or change points of discharge in a manner that would adversely affect the designated uses of waters of the state. (d) facilities of stormwater management systems that include a combina- tion of management practices including but not limited to retention basins, swales, pervious pavement, landscape or natural retention storage that will provide for the percolation of the runoff from a three-year one-hour design storm. Specific Authority: 403.061, 403.087, 403.088, 403.504, F.S. Law Implemented: 403-021, 403-061, 403-087, 403.088, 403-121, 403-141, 403.161, 403.182, 403.502, 403.702, 403.708, F.S. History: Formerly 17-4.248, Amended and Renumbered 2-1-82, Amended 3-30-82, 1-26-84, 3-28-84, 5-8-85. Previously numbered as 17-25.03. 17-2S.03S Stormwater General Permits. (1) Except in the geographical area for which the Department has delegated stormwater permitting to the Southwest Florida Water Management 17-25.030(2) -- 17-25.035(l) DER1986. REGULATION OF STORMINATER DISCHARGE 17-25 District, the following types of new stormwater discharge facilities may be constructed pursuant to general permit as specified in Section 17-4.710, F.A. C. This general permit shall not expire and shall not be subject to Section 17-4.540(13) unless suspended or revoked in accordance with Section 17-4.530(5). (a) facilities which discharge into a stormwater discharge facility which is permitted pursuant to Section 17-25-040 or Section 17-25.035(l)(b) or (d), F.A. C. or which was previously approved pursuant to a noticed exemption under Section 17-25.030 where the appropriate treatment criteria specified in this chapter and applied to the permitted or exempt facility are not exceeded by the discharge; however, this does not authorize discharge to the permitted or exempt facility without the facility owner's prior written consent; or, (b) facilities which provide retention, or detention with filtration, of the runoff from the first one inch of rainfall; or, as an option, for projects or project subunits with drainage areas less than 100 acres, facilities which provide retention, or detention with filtration, of the first one half inch of runoff. However, facilities which directly discharge to Outstanding Florida Waters shall provide additional treatment pursuant to Section 17-25.025(9), F.A. C.; or, (c) modification or reconstruction by a city, county, state agency, special district with drainage responsibility, or water management district of an existing stormwater management system which Is not intended to serve new development, and which will not Increase pollution loading, or change points of discharge in a manner that would adversely affect the designated uses of waters of the state; or, (d) facilities of stormwater management systems that include a combina- tion of management practices including but not limited to retention basins, swales, pervious pavement, landscape or natural retention storage that will provide for the percolation of the runoff from a three-year one-hour design storm. Specific Authority: 403.814(l), 403.912, F.S. Law Implemented: 403.061, 403.087, 403-088, 403-12.1, 403.141, 403-161, 403.182, 403.502, 403.702, 403.708, 403.814, F.S. History: New 5-8-85. 17-25*040 Construction Permit Requirements for New Stormwater Discharge Facilities. (1) An-y person intending to construct a new stormwater discharge facility, except as exempted pursuant to Section 17-25.030, Florida Adminis- trative Code, or as noted in Section 17-25.035, or as permitted in Section 17-25.042, or as noted in Section 17-25.060, Florida Administrative Code, shall apply to the Department for a construction permit, using forms provided by the Department, prior to commencement of construction of the stormwater discharge facility. In a geographical area where delegation has occurred, pursuant to Section 17-25.050, Florida Administrative Code, application shall be made pursuant to the provisions of the rules of the entity receiving the delegation. (2) Construction of a new stormwater discharge facility shall not be 17-25-035(l) -- 17-25.040(2) 05-14-86 DER 1986 REGULATION OF STORMWATER DISCHARGE 17-2S undertaken without a valid construction permit as required pursuant to this section. (3) Modifications to an existing stormwater management system that will increase the discharge of the stormwater discharge facility beyond its previously designed and constructed capacity, or increase pollution loading, or change points of discharge, except for emergency repairs, are considered new stormwater discharge facilities for purposes of this chapter. (4) A construction permit may be issued to the applicant, upon such conditions as the Department may direct, only if the applicant affirmatively provides the Department with reasonable assurance based on plans, test results and other information, that the construction, expansion, modification, operation, or activity of the stormwater discharge facility will not discharge, emit, or cause pollution in contravention of Department standards, rules or regulations. (5) A showing by the applicant that the facility design will provide treatment equivalent to either retention, or detention with filtration, as described in this Chapter, of the runoff from the first one inch of rainfall; or, as an option for projects or project subunits with drainage areas less than 100 acres, the first one half inch of runoff, shall be presumed to provide reasonable assurance pursuant to subsection (4) above, provided that adequate provisions have been made for operation and maintenance of the proposed facility. However, facilities which directly discharge to Outstanding Florida Waters shall provide additional treatment as specified in Section 17-2S.02S(9). (6) Regional stormwater discharge facilities shall be permitted upon application and a showing by the applicant that: (a) the facility will provide treatment equivalent to either retention, or detention with filtration, of the runoff from the first one inch of rainfall; or, as an option, for facilities with a drainage area less than 100 acres, the first one half inch of runoff; and, (b) facilities which directly discharge to Outstanding Florida Waters shall provide additional treatment as specified in Section 17-25.025(9); and, (c) the facility is designed to meet the treatment criteria specified in (a) or (b) above for projected future land use conditions and associated stormwater volumes; and, (d) the owner of the facility notifies the Department on a semi-annual basis, on forms provided by the Department, of all new projects and their associated starmwater volumes that have been allowed to discharge stormwater into the regional facility and certifies that the maximum allowable treatment volume of stormwater has not been exceeded. (e) adequate provisions have been made for the operation and maintenance of the proposed facility. (7) In otherwise determining whether reasonable assurance has been provided, the Department shall, where appropriate, consider: (a) whether best management practices are proposed, such as those described in "A Manual of Reference Management Practices for Urban Activities (July, 1978)", "A Manual of Reference Management Practices for Construction Activities (December, 1977)", "A Manual of Reference Management Practices for 17-2S.040(2) -- 17-25.040(7)(a) DER 1986 REGULATION OF STORMWATER DISCHARGE 17-25 Agricultural Activities (November 1978)", "Silviculture Best Management Practices Manual (1979)", "Stormwater Management Manual (October 1981)", or best management practices described in manuals adopted by the Environmental Regulation Commission pursuant to Section 17-25.050, or other appropriate best management practices. Tile manuals listed above by name are adopted and made a part uf this rule by reference. Copies of these documents may be obtained by writing the Department, and may be inspected at all Department offices; (b) the public interest served by the discharge; (c) the probable efficacy and costs of alternative controls; (d) whether -the proposed water quality benefits are reasonably related to tile costs of the controls; and (e) whether reasonable provisions have been made for the operation and maintenance of the proposed facility. Specific Authority: 403.031, 403-061, 403.912, F.S. Law Implemented: 403.021, 403.031, 403.061, 403.087, 403.088, F.S. History: Formerly 17-4.248, Amended and Renumbered 2-1-32, Amended 3-30-82, 1-26-84, 3-28-84, 5-8-85. Previously numbered as 17-25.04. 17-25.042 Permit Requirements for Wetlands Stormwater Discharge Facilities. (1) The wetlands stormwater discharge facility performance standards and other provisions relating to such facilities are an initial but necessary step by the Department in a field in which there exists limited knowledge. In an effort to further refine the state's wetlands stormwater discharge facility policies, monitoring data and other pertinent information relating to tile performance standards will be collected and analyzed and periodic reports of the results of this monitoring shall be made available to the public. The Department must attempt to ensure that the wetlands stormwater discharge facility is compatible with the ecological characteristics of the wetlands utilized for stormwater treatment and to ensure that water quality standards will not he violated by discharges from wetlands stormwater discharge facilities. To achieve these goals, specific performance standards are set forth in this chapter. However, recognizing the complexities and concerns of implementing wetlands stormwater treatment performance standards, the Depart- ment shall review the monitoring data and other pertinent information on a regular basis. The Department shall present tile information to the Commission it a public hearing no later than April 1, 1989. Unless the Commission affirmatively-determines that the performance standards remain appropriate, or amends them as it deems necessary, Section 17-25-042(6) shall be repealed effective April 1, 1989. (2) The wetlands to be used for stormwater management are those: (a) which are connected to other waters by artificial watercourses; or (b) which are connected to other waters solely by an intermittent watercourse. (3) Any person who owns or has written authorization to use a wetland for stormwater treatment shall apply to the Department for a wetlands stormwater discharge facility permit,using forms provided by tile Department, and shall receive such permit prior to commencement of construction of the stormwater 17-25.040(7)(a) 17-25.042 (3 05-14-86 . 6 1 . , .. -,ER 1-486 k!4- Si_Q#.%MWAI_LR DISCrIAk(__ f 7- 2' discharg(_ facility. The, application shaJI be processed by the Departmen., ?Ccording to the procedurr!-, of Chapter 17-4, F,A.C. (4) A wetlands storinwater discharge facility permit may be issued to the applicant, upon such conditions as the Department may direct, only if the applicant affirmatively provides the Department with reasonable assurance based on plans, test results or other information, that the construction, operation, or activity of the stormwater discharge facility shall not emit, or cause pollution in downstream waters in contravention of Department standards, rules or regulations. (5) 1 n theL,'*v ,eview of wetlands stormwater discharge facility permit applications, the Department shall consider the following: (a) compliance of the wetlands stormwater discharge facility permit with the performance stanclards specified in Section 17-25-042(6), F.A.C. (b) if the applicant is unable to show compliance with the performance standards in Section 17-25-042(.6), the applicant may qualify for a wetlands :;tormwater discharge facility permit using alternative design and performance standards approved by the Department provided that the use of the wetlands is compatible with Lhot -'wological char acteri s tics of the wetland and, the appli- cant complies with Section 17-25.042(4), F.A.C. (c) if the appl'Icant proposes to dredge or fill in the wetlands used for stormwater treatment, the Department in its review of the permit application shall evaluate the adverse effects of the dredging or filling on the treatment capability of the wetland. (5) A showing by the applicant that the wetlands stormwater discharge f'cility design complies with the performance standards listed below shall cteate a presumption in favor of the issuance of the permit: (a) the facility romplies with the requirements of Section 17-25.060(2), F.A. C. (b) the facility is part of a comprehensive stormwater management system that utilizes wetlands in combination with other best management practices to provide treatment of the runoff from the first one inch of rainfall; or, as an option for projects or project subunits with drainage areas less than 100 acres, the first one-half inch of runoff. Those facilities which directly discharge to Outstanding Florida Waters shall provide additional treatment as specified in Section 17-25.025(9), F.A.C. (c) the utilization of wetlands for stormwater treatment shall not adversely affect the wetland by disrupting the normal range of water level fluctuation of ffie wetland as it existed prior to 'construction of the wetlands stormwater discharge facility. Normal range of water level fluctuation will be defined as the maintenance of the fluctuating water surface changes between cie normal low water and the normal high water of the wetland system so as to prevent the desiccation or over impoundment of the wetland. The Department shall use water level data, lines on the trees, adventitious roots or other. hydrological and biological indicators to determine the normal low and normal high water levels. Upland detentioti may be necessary to attenuate peak flows and meet the water level fluctuations specified above. When the normal range of water level flurtuations has been artificially altered, the Department shall estiblish an acceptahle range of water level fluctuation based on 17-2S.042(3) -- 17-25.042(6)(c) a5-14-86 .DER1986 REGULATION OF STORMWATER DISCHARGE 17-25 historical information as to the previous size and nature of the wetlands, if available. If such information is not available, the range of water level fluctuation shall be derived from sound scientific principles or from analysis of other natural wetland systems in the vicinity. (d) the wetlands stormwater discharge facility must be able to contain the runoff as specified in Section 17-25.042(6)(b), F.A.C. within the wetlands. Where the wetlands stormwater discharge facility alone cannot contain the runoff volume specified in (b) above within the water level ranges specified in (c) above, the other best management practices of the stormwater management system shall not adversely affect the ability of the wetlands stormwater discharge facility from meeting the requirements of this section. The design features of the facility shall maximize residence time of the stormwater within the wetland. The outfall structure shall be designed to bleeddown the volume specified in Section 17-25-042(6)(b) in no less than 120 hours with no more than one-half of the volume to be discharged within the first 60 hours. (e) stormwater shall be discharged into the wetlands utilized so as to minimize the channelized flow of stormwater by employing methods including, but not limited to, sprinklers, overland flow or spreader swales. (f) facilities which receive stormwater from areas which are a potential source of oil and grease contamination in concentrations exceeding applicable water quality standards shall Include a baffle, skimmer, grease trap or other mechanism to minimize the amounts of oils and greases entering the wetlands utilized for stormwater treatment. (g) erosion and sediment controls shall be used during construction and operation of the facility to minimize sedimentation of the wetlands utilized for stormwater treatment. The sediment control mechanism shall be built in the uplands and be of sufficient size and design to minimize resuspension and discharge of collected sediments into the wetland and to allow for recurring maintenance removal of sediments without adverse impact to the wetland. (7) The operation phase of this permit shall not become effective until: (a) an engineer certifies that the wetlands stormwater discharge facility has been constructed in accordance with the design approved by the Department. Within 30 days after completion of construction of the wetlands stormwater discharge facility, the permittee shall submit the certification and two copies of as-built drawings and notify the Department that the facility is ready for inspection. The certification prepared by an engineer (not necessarily the project design engineer but one who has been retained or employed by the permittee to provide professional engineering services during the construction phase of project completion) shall be made on forms provided by the Department. 'The engineer shall certify therein that the facility has been constructed substantially in accordance with approved plans and specifications, and that any deviations will not prevent the facility from functioning in compliance with the requirements of this chapter. The engineer shall note and explain substantial deviations from the approved plans and specifications. The certification shall be based upon on-site observation of construction (scheduled and conducted by the engineer or by a project repre- sentative under his direct supervision) for the purpose of determining if the 17-25.042(6)(c) -- 17-25-042(7)(a) OS-14-115 DER 1986 REGULATION OF STORMWATER DISCHARGE 17-25 work was completed in compliance with approved plans and specifications; (b) the permittee submits to the Department documentation that adequate provisions have been made for the operation and maintenance of the facility and for meeting any special permit conditions, such conditions may include water quality monitoring. (8) In order to establish a reliable, scientifically valid data base upon which to evaluate the performance standards and the performance of the wetlands stormwater discharge facility, a monitoring program may be required. Monitoring programs shall provide the Department with comparable data for different types of wetlands and drainage designs. Data to be collected may include, but not be limited to, sedimentation rate, sediment trace metal concentrations, sediment nitrogen and phosphorus concentrations, changes in the frequency, abundance and distribution of vegetation and inflow and outflow water quality for nutrients, turbidity, oils and greases, bacteria and other parameters related to the specific site conditions. Inflow and outflow water quality parameters will be monitored on such storm event occurrences as established by the Department based on a site specific basis. Analytical data must be provided using standard procedures prescribed by a Department approved Quality Assurance Plan and reported in a format provided by the Department. The Department shall eliminate the requirement to continue the monitoring program upon Its determination that no further data Is necessary to evaluate the performance standards or ensure compliance with the performance standards and applicable water quality standards. (9) A permit Issued pursuant to this section shall be valid for a period of up to five years from the date of issue unless an earlier renewal date is specified by the Department. Both construction and operation of the facility will be covered by the Initial permit. (10) If the facility will continue to operate after the expiration date of the initial permit, the permit must be renewed. A permit may be renewed upon submittal to the Department of a certification that the facility is operating in compliance with the performance criteria of this section and is not causing water quality violations of downstream waters. The certification shall be treated as an application for permit renewal for purposes of the time provisions specified in Section 120.60, F.S. (11) The permit may be transferred only pursuant to Florida Administra- tive Code Rule 17-4.120. Upon transfer, all original permit conditions, schedules and criteria continue to be applicable. Specific Authority: 403.061, 403.912, 403.918, F.S. Law Implemented: 403.087, 403.088, 403.918, 403.919, 403.921, 403.924, 403.927, 403.929, F.S. History: New 5-8-85. 17-25.OSO Delo"tIon. (1) The Department may, after notice in the Florida Administrative Weekly pursuant to the provisions of Chapter 120, Florida Statutes, delegate to either local governments or water management districts seeking such delega- tion, as provided in Sections 403.182, 403.812, Florida Statutes, and this section, the authority to process notices, issue or deny permits, initiate 170-2S.042(7)(a) -- 17-25.050(l) 05-14-86 DER 1986 REGULATION OF STORUWATER DISCHARGE 17-25 work was completed in compliance with approved plans and specifications; (b) the permittee submits to the Department documentation that adequate provisions have been made for the operation and maintenance of the facility and for meeting -any special permit conditions, such conditions may include water quality monitoring. (8) In order to establish a reliable, scientifically valid data base upon which to evaluate the performance standards and the performance of the wetlands stormwater discharge facility, a monitoring program may be required. Monitoring programs shall provide the Department with comparable data for different types of wetlands and drainage designs. Data to be collected may include, but not be limited to, sedimentation rate, sediment trace metal concentrations, sediment nitrogen and phosphorus concentrations, changes in the frequency, abundance and distribution of vegetation and inflow and outflow water quality for nutrients, turbidity, oils and greases, bacteria and other parameters related to the specific site conditions. Inflow and outflow water quality parameters will be monitored- on such storm event occurrences as established by the Department based on a site specific basis. Analytical data must be provided using standard procedures prescribed by a Department approved Quality Assurance Plan and reported in a format provided by the Department. The Department shall eliminate the requirement to continue the monitoring program upon Its determination that no further data Is necessary to evaluate the performance standards or ensure compliance with the performance standards and applicable water quality standards. (9) A permit issued pursuant to this section shall be valid for a period of up to nve years from the date of Issue unless an earlier renewal date is specified by the Department. Both construction and operation of the facility will be covered by the Initial permit. (10) If the facility will continue to operate after the expiration date of the initial permit, the permit must be renewed. A permit may be renewed upon submittal to the Department of a certification that the facility is operating in compliance with the performance criteria of this section and is not causing water quality violations of downstream waters. The certification shall be treated as an application for permit renewal for purposes of the time provisions specified in Section 120.60, F.S. (11) The permit may be transferred only pursuant to Florida Administra- tive Code Rule 17-4.120. Upon transfer, all original permit conditions, schedules and criteria continue to be applicable. Specific Autfiority: 403.061, 403.912, 403.918, F.S. Law Implemented: 403.087, 403.088, 403.918, 403.919, 403.921, 403.924, 403.927, 403.929, F.S. History: New 5-8-85. 17-25.*OSO Delegatione (1) The Department may, after notice in the Florida Administrative Weekly pursuant to the provisions of Chapter 120, Florida Statutes, delegate to either local governments or water management districts seeking such delega- tion, as provided in Sections 403.182, 403.812, Florida Statutes, and this section, the authority to process notices, issue or deny permits, initiate 17-25.042(7)(a) 17-25.050(l) OS-14-86 DER 1986 REGULATION OF STORMWATER DISCHARGE 17-25 enforcement actions, and monitor for compliance as provided in Sections 403.182, 403.812, Florida Statutes, and this section. Delegation shall not include the authority for a local government or a water management district to issue or deny permits for its own activities except replacement items or maintenance of existing facilities. (2) A water management district which has been delegated stormwater regulation pursuant to this section may establish alternative requirements which protect the designated uses of waters of the state provided that the alternative requirements are approved by the Environmental Regulation Commis- sion pursuant to Section 403.804, Florida Statutes and have been incorporated by reference as department stormwater rules in 17-25.090, F.A.C. These alternative requirements incorporated as department rules shall apply in lieu of the provisions of this Chapter in the area of delegation, and applicable surface water management and stormwater permit discharge standards shall be applied in one permit proceeding. Following delegation to a water management district, those activities within the district that meet the exemption criteria of Section 17-2S.030(l) shall be exempt from the requirements of Section 17-4.242 regarding Outstanding Florida Waters. (3) A local government which has been delegated stormwater regulation pursuant to this section may also establIsh by rule, ordinance or local law, alternative requirements'provided the Department determines such alternative requirements are compatible with, or more stringent than, those Imposed by this chapter. Specific Authority: 403.061, 403-062, 403.182, 403.805, 403.812, F.S. Law Implemented: 403.021, 403.061, 403.062, 403.182, 403.805, 403.812, F.S. History: Formerly 17-4.248, Amended and Renumbered 2-1-82, Amended 1-26-84, 5-8-85. Previously numbered as 17-25.05. 17-25*060 Relationship to Other Permitting Requirements. (1) Whenever the construction of a new stormwater discharge facility requires that a dredge or fill permit be secured pursuant to Sections 17-4.280 or 17-4.290 or Chapter 17-12, Florida Administrative Code, or whenever other rules of the Department require that a permit, section 401 federal Clean Water Act certification or other certification be secured, all applicable stormwater requirements under this chapter shall be reviewed as part of those permit applications. A separate permit application under this chapter shall not be required. If the applicant requests a separate stormwater permit, the appli- cant must notify.the Department of any other Department permits, exemptions, or certifications which have or will be requested for the project. (2) The permit requirements of Chapter 17-4 or other applicable rules, rather than those of this chapter, shall apply to discharges which are a combination of stormwater and industrial or domestic wastewater or which are otherwise contaminated by non-stormwater sources unless: (a) the stormwater discharge facility is capable of providing treatment of the non-stormwater component sufficient to meet state water quality stan- dards; and 17-25-050(l) -- 17-25.060(2)(a) W14-86 DER1986 REGULATION OF STORMWATER DISCHARGE 17-25 (b) the applicant requests that the permit requirements of this Chapter apply. Specific Authority: 403.061, 403.062, 403.087, F.S. Law Implemented: 403.021, 403.061, 403.087, 403.088, 403.101, 403-702, 403.708, F.S. History: Formerly 17-4.248, Amended and Renumbered 2-1-82, Amended 1-26-84, 5-8-85. Previously numbered as 17-25-06. 17-25.07 Transferability of Other Chapters. Specific Authority: 403-061, 403.062, 403.087, 403.504, F.S. Law Implemented: 403.021, 403.061, 403.087, 403-088, 403.101, 403-502, 403.702, 403.708, F.S. History: Formerly 17-4.248, Amended and Renumbered 2-1-82, Repealed 5-1-82. 17-25.080 General Provisions. Nothing under this chapter shall preclude: (1) stormwater effects from being considered in the evaluation of other types of permits where such consideration is relevant to a determination of compliance with applicable Department requirements. (2) the legal joinder In a permitting proceeding under this chapter of persons who own or control unpermitted stormwater discharge systems which comprise a significant portion of the stormwater discharge facility. (3) the Department from taking appropriate legal action including but not limited to the requiring of a permit to prevent the Impairment of a use for which a water of the state has been designated under Chapter 17-3, Florida Administrative Code. (4) the Department from entering interagency or interlocal agreements to accomplish the provisions of this chapter. Specific Authority: 403.061, 403.062, 403.087, F.S. Law Implemented: 403.021, 403.061, 403.087, 403.088, 403.121, 403.141, 403.161, 403.708, F.S. History: Formerly 17-4.248, Amended and Renumbered 2-1-82. Previously numbered as 17-25.08. 17-25.090 List of Entities to Which Permitting Pursuant to this Chapter has been Delegated; Addresses; Delegation Documents and Rules Adopted by Reference. - - . (1) South Florida Water Management District; Post Office Box V; West Palm Beach, Florida 33402 (a) Surface Water Management Rule; Chapter 40E-4, Florida Administrative Code (March 9, 1983); (b) General Surface Water Management Rule; Chapter 40E-40, Florida Administrative Code (December 1, 1982); (c) "Basis of Review for Surface Water Management Permit Applications within the South Florida Water Management District - May 1986." 17-25.060(2)(b) -- 17-25.090(l)(c) 05-14-86 DER1986 REGULATION OF STORMWATER DISCHARGE 17-25 (d) Nothing in this delegation shall prevent the Department f rom considering the stormwater impact of dredging or filling regulated pursuant to 17-4.280 or 17-4.290 or Chapter 17-12, Florida Administrative Code, or the District from implementing applicable provisions of Chapters 17-3 and 17-4, Florida Administrative Code. Provided, however, in those cases where the water management district has issued a surface water management permit pursuant to Chapter 373, Part IV, and this delegation, the Department shall confine its review of stormwater quality impacts solely to those generated by dredging and filling regulated pursuant to Rules 17-4.280 and 17-4.290, Florida Administrative Code. (2) Southwest Florida Water Management District; 2379 Broad Street, Brooksville, Florida 33512. (a) Regulation of Stormwater Discharge; Chapter 17-25, Florida Adminis- trative Code, except for Section 17-25.042. (b) When a proposed stormwater discharge facility is associated with activities which require a dredge and fill, industrial waste, or hazardous waste permit from the Department, stormwater permit applications and exemption notices must be submitted to the Department and the Department shall regulate such stormwater discharge facilities within the District. (3) Suwannee River Water Management District; Route 3, Box 64, Live Oak, Florida 32060. (a) Surface Water Management and Works of the District Rule; Chapter 4013-4, Florida Administrative Code (August 15, 1985). (b) The permitting of wetlands stormwater discharge facilities pursuant to Section 17-25.042 Is not delegated to the District. (4) St. Johns River Water Management District, Post Office Box 1429, Palatka, Florida 32078. (a) Regulation of Stormwater Discharge, Chapter 40C-42, Florida Adminis- trative Code (February 1986). (b) The permitting of wetlands stormwater discharge facilities pursuant to Section 17-25.042 is not delegated to the District. Specific Authority: 403.061, 403.812, F.S. Law Implemented: 403.021, 403.061, 403.812, F.S. History: Formerly 17-4.248, Amended and Renumbered 2-1-82, Amended 3-30-82, 1-26-84, 3-28-84, 5-8-85, 5-14-86. Previously numbered as 17-2S.09. 17-25olo Effective Dateo Specific Authority: 120.54(12)(a), 403.061(7), F.S. Law Implemented: 120.5402)(a), 403.051, F.S. History: Formerly 17-4o248, Amended and Renumbered 2-1-82, Repealed 1-26-84. 17-25.090(l)(d) -- 17-25.10(History) OS-14-86 APPENDIX B. Florida Department of Environmental Regulation Revisions to the Stormwater Rule Chapter 17-25, F.A.C. Draft Date: October 7, 1988 Florida Department of Environmental Regulation Twin Towers Office Bldg. 2600 Blair Stone Road Tallahassee, Florid., 32399-2400 Bob Martinez. Governor Dale Twachtmann. Secreary John Shearer. Assistant Secretary OF MEMORANDUM TO: Stormwater Mailing List Interested Parties FROM: Eric Livingston, Administrator Stormwater/Nonpoint Source Management Section DATE: October 7, 1988 SUBJECT: Revisions to the Stormwater Rule, Chapter 17-25, F.A.C. As many of you know, for some time the Department has been advising the regulated public to not use detention with filtration systems because of inherent problems associated with their design, construction and operation Which greatly reduce the water quality benefits of filtration systems Accordingly, the Stormwater Rule is being revised to eliminate the geNeral permit for filtration systems and to create a new general permit for wet detention systems. The wet detention design and performance standards listed in Section 17-25.025(5) are those which have been required by the Department to obtain construction permits for wet detention systems since 1978. The proposed revisions are summarized below: 17-25 Draft Revisions 1. Eliminating definitions associated with stormwater filters Section 17-25.020(7), (8) and (17). 2. Providing a new definition for underdrain systems Section 17-25.020(15). 3. Deleting existing language in Section 17-025 Design and Performance Standard following the introductory paragraph. Reorganizing the existing language in this section which may pertain to any class of treatment system [Existing 17-25.025(6) through (9) and listing these standards under a new heading "(1) General Criteria: All New Stormwater Management Systems". [New 17-25.025(1) through 17-25.025(l)(d)]. 4. Moving existing language regarding standards for retention ponds and swales [Existing 17-25.025(4) and (5)], new Section 17-25.025(2) and (3). MEMORANDUM: STORMWATER RULE REVISIONS .October 7, 1988- Page Two 5. Providing for additional design criteria and standards associated with underdrained stormwater basins in Section 17-25.025(4). Standards for these systems were previously a subset of the criteria associated with filters. 6. Providing new design criteria and standards for a new class of treatment system (wet detention) for which a general permit is proposed [New Section 17-25.025(5)]. 7. Revising Section 17-25.03(l)(b) language associated with the 10 acre/2 acre impervious area exemption to conform with recent statutory changes. 8. Eliminating existing 17-25.030(2) language associated with "notice exemptions" within the boundaries of the Southwest Florida Water Management District. This section is no longer needed since SWFWMD how has adopted provisions for stormwater general permits for these activities. 9. Renumbering Section 17-25.030 to reflect the above deletions. 10. Deleting existing introductory language from Section 17-25.035 Stormwater General Permits. Replace with existing nearly duplicate language from Section 17-25.801. Also moving additional language regarding General Permits for Stormwater Discharge Facilities [Existing Section 17-25.8011 to Section 17-25.035(2). 11. Deleting stormwater filters from those facilities eligible for a stormwater general permit [Section 17-25.035(l)(b)] with the exception of completely underdrained stormwater retention areas. 12. Providing for a new category of general permit (wet detention pond) to replace filter systems [Section 17-25.035(l)(c)]. 13. Renumbering Section 17-25.035 to reflect additions and deletions. 14. Deleting existing language associated with equivalent treatment under Section 17-25.040 to reflect the loss of the presumption of filtration as providing treatment equal to other practices. Adding language to reflect that treatment equivalent to specified levels of wet detention will also be acceptable to establish a presumption in favor of issuing a permit. [Ref. 17-25.040(5) and (6)]. 15. Deleting existing references to Chapter 17-25 associated with delegation to tne Southwest Florida Water Management District, Section 17-25.090(2)(a). Revising language to reflect the delegation of wetland stormwater facilities to SWFWMD. 16. Deleting existing Section 17-25.801 since these provisions are included in new Section 17-25.035. MEMORANDUM: STORMWATER RULE REVISIONS October 7, 1988 Page Three A public workshop to discuss the proposed revisions will be held in Room 609 of the Twin Towers Office Building, 2600 Blair Stone Road, Tallahassee on October 18 commencing at 10 am. The complete rule revisions schedule is listed below: 17-25 Rule Revision Schedule October 7 Mail revisions to Stormwater Mailing List Publish FAW notice for Workshop #1 October 18 Workshop-#l in Tallahassee November 4 Publish FAW Notice for Workshop #2 November 16 Workshop #2 in Tallahassee (if necessary) December 7/8 ERC Adoption in Tallahassee Florida Department of Environmental Regulation Twin Towers Officc Bldg. 0 2600 Blair Stone Road 0 Tallahassee, Florida 32399-2400 Boh Martinez, (;ovcrnor Dale Twachtniann, Secretary John Shearer, Assistant Secretary OF Stormwater Rule Workshop Agenda October 18, 1988, 10:00 am Room 609, Twin Towers Office Building 1. Call to Order 2. Explanation of purpose of revisions 3. Presentation on wet detention design 4. Review and discussion of rule revisions 5. Adjournment 1 10-18-88 WORKSHOP DRAFT CHAPTER 17-25 4 REGULATION OF STORMWATER DISCHARGE 5 6 17-25.001 Scope. 7 17-25.020 Definitions. 8 17-25.025 Design and Performance Standards. 9 17-25.027 Legal Operation/Maintenance Entity Requirements. 10 17-25.030 Exemptions. 11 17-25.035 Stormwator General Permits. 12 17-25.040 Construction Permit Requirements for New Stormwater 13 Discharge Facilities. 14 17-25.042 Permit Requirements for Wetlands Stormwater Discharge 15 Facilities. 16 17-25. 050 Delegation. 17 17-25.060 Relationship to Other Permitting Requirements. 18 17-25.070 Transferability of Other Chapters. (Repealed) 19 17-25.080 General Provisions. 2o 17-25.090 List of Entities to Which Permitting Pursuant to this Chapter has been Delegated; Addresses; Delegation Documents and 22 Rules Adopted by Reference. 23 17-25.100 Effective Date. (Repealed) 24 17-25.801 General Permit for New Stormwater Discharge Facilities. CODING: Words in underlined are additions; Words in struck through type are deletions from existing law. 17-25.001 Scope. (1) The discharge of untreated stormwater say reasonably be expected to 3 be a source of pollution of waters of the state and is, therefore, subject 4 to Department regulation. The Department shall prevent pollution of waters 5 of the state by discharges of stormwater, to ensure that the designated most 6 beneficial uses of waters, as prescribed by Chapter 17-3, Florida 7 Administrative Code, are protected. a (2) A permit under this chapter will be required only for new 9 stormwater discharge facilities as defined herein. This provision shall not 10 affect the Department's authority to require appropriate corrective action, 11 pursuant to Sections 403.121 - 403.161, Florida Statutes, whenever existing 12 facilities cause or contribute to violations of state water quality 13 standards. 14 . (3) Stormwater discharges to groundwaters shall be regulated under the 15 provisicns of Section 17-28.700, F.A.C. and other applicable rules of the 16 Department. 17 (4) The Department intends that, to the greatest extent practicable, 18 the provisions of this chapter be delegated to either local governments or ig water management districts seeking such delegation. C- .0 Specific Authority: 40,3.061, F.S. 21 Law Implemented: 403.021, 40.3.061, 403.101(l), F.S. E:. History: Formerly 17-4.248, Amended and Renumbered 2-1-82, Amended 1-26-84. -'3 Previously numbered as 17-25.01. 2 CODING: Words in underlined are additions; Words in ttrttek thratigh type are deletions from existing law. 17-25.020 Definitions. (1) "Artificial Watercourse" means a man-made waterway that was totally 4 dredged or excavated prior to October 1, 1984 and which connects formerly 5 isolated, nonjurisdictional wetlands to other waters. The Department shall 6 bear the burden to show that such artificial watercourse was not totally@ 7 dredged or excavated or that the connected wetlands were formerly 8 jurisdictional. 9 (2) "Completion of Construction" means the time at which the stornwater 10 discharge facility is first placed into operation or when the project passes 11 final building inspection or when the project receives a certificate of 12 occupancy, whichever comes first. 13 (3) "Conservation Plan" means a formal document, prepared or approved 14 by a local Soil and Water Conservation District Board organized pursuant to 15 Chapter 582, Florida Statutes, which outlines a system of management 16 practices to control soil erosion, reduce sediment loss or protect the water 17 quality on a specific parcel of property. 18 (4) "Construction" means any on-site activity which will result in the 19 creation of a new stormwater discharge facility, including the building, C ,0 assembling,-expansion, modification or alteration of the existing contours _ 21 of the property, the erection of buildings or other structures, or any part 22 thereof, or land clearing. 23 (5) "Detention" or "To Detain" means the collection and temporary 24 storage of stormwater in such a manner as to provide for treatment through 3 CODING: Words in underlined are additions; Words in 43trttelt thr*ttgh type are deletions from existing law. 2 physical, chemical, or biological processes with subsequent gradual release 3 of the stormwater. 4 (6) "Engineer" means a Professional Engineer registered in Florida, or 5 other person exempted pursuant to the provisions of Chapter 471, Florida 6 Statutes, who is competent in the fields of hydrology and stormwater 7 pollution control. a +31*"Ef f -f 9 12 13 14 15 16 (7)-f9* "Intermittent Watercourse" means a stream or waterway that flows 17 only at certain times of the year, flows in direct response to rainfall, and 18 is normally an influent stream except when the groundwater, table rises above 19 the normal wet season level. 21a (8)-++$* "New Stormwater Discharge Facility" means a stormwater 21 discharge facility which was not in existence on February 1, 1982, or for 22 which a completed storawater discharge, dredge or fill, or other Department 23 permit or license application had not been received before February 1, 1982, 2-4 or an existing stormwater discharge facility which is modified, as specified 4 CODING: Words in underlined are additions; Words in ttrttak threu!;h type are deletions from existing-law. 1 in Section 17-25.040(3), Florida Administrative Code, on or after February 1, 1982. A stormwater discharge facility approved or found to be exempt by the Department before February 1, 1982, or a facility which had been 4 determined by the Department not to be significant pursuant to 17-4.248(5) before February 1, 1982, shall not be considered a new stormwater discharge facility 7 unless modified pursuant to Section 17-25.040(3). a (9) "Regional Stormwater Discharge Facility" means a stormwater 9 discharge facility which is permitted pursuant to Section 17-25.040(6) and 10 is designed and constructed to accept stormwater from multiple parcels 11 within the drainage area served by the regional facility. Drainage area 12 refers to the land or development that is served by and/or contributes 13 stormwater to the regional facility. 14 "Retention" or "To Retain" means the prevention of, or to 15 prevent the discharge of, a given volume of stormwater runoff into surface 16 waters of the state by complete on-site storage. 17 (11)* "Stormwater" means the flow of water which results from, and 18 which occurs immediately foll owing, a rainfall event. 19 (12)"Stormwater Discharge Facility" means a stormwater management 20 system which discharges stormwater into surface waters of the State. 21 (13)* "Stormwater Management System" means the designed features of 22 the property which collect, convey, channel, hold, inhibit or divert the movement of stormwater. 24 (14)* "Swale" means a manmade trench which: 5 CODING: Words in underlined are additions; Words in through type are deletions from existing law. 1 (a) has a top width-to-depth ratio of the cross-section equal to or 2 greater than 6:1, or side slopes equal to or greater than 3 feet horizontal 3 to 1 foot vertical; and, 4 (b) contains contiguous areas of standing or flowing water only 5 following a rainfall event; and, 6 (c) is planted with or has stabilized vegeta tion suitable for soil 7 stabilization, stormwater treatment, and nutrient uptake; and, 8 (d) is designed to take into account the soil erodibility, sioil 9 percolation, slope, slope length, and drainage area so as to prevent erosion 10 and reduce pollutant concentration of any discharge. 11 (15) "Underdrain" means a drainage system installed beneath a stormwater 12 holdina area to improve the infiltration.and percolation characteristics of 13 the natural soil when permeability is restricted-due to periodic high water 14 table conditions or the presence of layers of fine textured soil below the 15 bottom of the facility. These facilities usually consist of a system of 16 interconnected below-ground conduits such as perforated pipe, which 17 simultaneously limit the water table elevation and intercept, collect, and 18 convey stormwater which has percolated through the soil. 19 (17) "Uniformity- boefficient" means the number representing the degree 20 of homogeneity in the distribution of particle sizes of filter sand or other 21 granular-material, The coefficient is calculated by determining the D /D 22 retie where B10 and B60 refer to the particle diameter corresponding to the 23 10 and 60 percentile of the material which is finer by dry weight 24 (16) "waters" are as defined in Section 403.031(12), Florida CODING: Words in underlined are additions; Words in through type are deletions from existing law. I Statutes. 2 (17) (19)- "Wetlands" means, for the purposes of this rule, those waters which are dominated by those plant species listed in Section 17-3.021(15) or 4 Section 17-3.022, F.A.C. and which meet the conditions specified in Section 5 17-25.042(2), F.A.C. 6 (18)(20) "Wetlands Stormwater Discharge Facility" means a new 7 stormwater discharge facility which incorporates those wetlands identified 8 in Section 17-25.042(2), F.A.C. into the stormwater management system to 9 provide stormwater treatment. 10 Specific Authority: 403.061, F.S. 11 Law Implemented: 403.021, 403.031, 403.061, 403.913, F.S. 12 History: Formerly 17-4.248, Amended and Renumbered 2-1-82, Amended 3-30-82, 13- 1-26-84 5-8-85 Previously numbered as 14 17-25.02. 16 17-25.025 Design and Performance Standards. 17 The following design and performance standards are established for the 18 purpose of determining compliance with this chapter, however, in some 19 instances they may not result in compliance with water quality-standards set 20 forth in Chapters 17-3 and 17-4 discharge facility shall cause or contribute to a violation of water quality 22 standards in waters of the state. Unless the applicant provides reasonable 23 assurance that the discharge will not cause or contribute to a violation of 2 4 water quality standards in waters of the state, the Department may require 7 CODING: Words in underlined are additions; Words in struck through type are deletions from existing law. 1 more stringent design and performance standards than are otherwise required 2 by this chapter: 3 (1) General Criteria: All New Stormwater Management Systems. 4 (a) Erosion and sediment control best management practices shall be used as 5 necessary during construction to retain sediment on-site. These management 6 practices shall be designed by an engineer or other competent professional 7 experienced in the fields of soil conservati.on or sediment control according 8 to specific site conditions and shall be shown or noted on the plans of the 9 storawater management syitem. The engineer or designer shall furnish the 10 contractor with information pertaining to the construction, operAtion and 11 Maintenance of the erosion and sediment control practices. 12 (b) Stormwater discharge facilities which receive stormwater from areas 13 which are a potential source of-oil and grease cRntamination in 14 qoncentrations that exceed applicable water-quality standards shall include 15 a baffle, skimmer, grease trap or other mechanism suitable for PreventinQ 16 oil and grease from leaving the stormwater discharge facility in 17 concentrationsthat would cause or contribute to violations of avPlicable 18 tiater quality standards in the receiving waters. 19 (c) Stormwater discharge facilities which discharge directly to OutstandinQ 213 Florida Waters shall add a level of treatment equal to fifty percent of the 21 treatment critLria specified in gection 17-25.035(l)(b)(c) or SeCtion 17- 22 25.040 or Section 17-25.042, F.A.C. 23 (d) Unless ap2_1icable local regulations are sort restrictive, for purposes 24 of public safety, permanently wet retention and detention basins shall be 8 CODING: Words in underlined are additions; Words in stroick through type are deletions from existing law. 1 fenced or otherwise restricted from public access, or shall contain side slopes that are no steeper than 4:1 (horizontal:vertical) out to a depth of -2 two feet below the control elevation. All side slopes shall be stabilized 4 by either vegetation or other materials to minimize erosion and 5 sedimentation of the basins. 6 (2) Retention basins shall again provide the capacity forlhe treatment 7 volume of stormwater within 72 hours after the storm. The additional 8 storage volume must be provided by a decrease of stored water caused only by 9 percolation through soil, evaporation or evapotranspiration. 10 (3) Swales shall be designed to Percolate 80% of the runoff from a three- 11 year one-hour design storm within 72 hours after the store, assuming average 12 antecedent conditions. 13 (4) Underdrain stormwater basins shall again provide the capacity for the 14 specified treatment volume of stormwater within 72 hours following a storm. 15 Underdrain systems shall be covered with at least two feet of indigenous 16 soil. Such systems-Shall be designed with a safety factor of at least two 17 unless the engineer affirmatively demonstrates based on plans, test results, 18 calculations or other information that a lower safety factor is appropriate 19 for the specific site conditions. Examples of how to apply this factor 20 include but are not limited to redmcinq the design percolation rate by half 21 or designing for the requir2d drawdown within 36 hours. The additional 22 storage volume must be provided by a decrease of stored water caused only by 23 percolation through soil, evaporation or evapotranspiration. These systems 24 shall: 9 CODING: Words in underlined are additions; Words in streek through type are deletions from existing law. 0 1 a) contain continuous areas of standing water only following a rainfall; a. and. 3 (b) be planted or otherwise established with permanent-vegetative cover 4 suitable for soil stabilization, stormwater treatment, and nutrient uptake.- 5 and, 6 (c) include a capped and sealed insoection or cleanout port at the terminus 7 of each drainage lateral, extending to the surface of the ground; and, a (d) include provisions for mowing and removal of grass clippings and yearly 9 aeration as a part of the regular maintenance plan. 10 (e) filter fabric or other means must be used to prevent the soil from 11 moving and being washed-out through.the underdrain Pipe. 12 (f) shall contain a free flowing discharge that is not affected by 13 backwater conditions from a 10Yr-24 hr design storm. 14 (5) Wet detention stormwater discharge facilities shall comply with the following design standards: 16 (a) The facility shall contain the runoff as specified in Section 17- 17 25.035(l)(c) F.A.C. The outfall structure shall bleed down the volume 18 specified in Section 17-25.035(l)(c) F.A.C. in no less than 120 hours with 19 no more than one-half of the volume to be discharged within the first 60 20 hours. (b) Apermanent pool of water shall'be provided such that the volume 22 between the control or bleed down elevation and the pond bottom results in a 23' residence time of at least 14 days. This volume may be determined by: 24 estimating 3.83% of annual average runoff, or 2. taking two inches times 10 CODING: Words in underlined are additions; Words in underlined type are deletions from existing law. 1 the impervious acreage in the project Plus one-half inch times the pervious acres-.-- The value in cubic feet is determined through multiplication times the appropriate conversion factor (i.e., 3630). 4 (c) A littoral zone shall be included to provide biological assimilation of 5 pollutants. 6 1. At least 35 percent of the detention system surface area shall consist 7 of a littoral zone that is available for biological assimilation of 8 pollutants. The percentage of littoral zone is based on the ratio of 9 vegetated littoral zone to the surface area of the pond at the control 10 elevation. 11 2. The littoral zone and vegetation shall be concentrated at the outfall, 12 unless multiple littoral areas are used. 13 3. The treatment volume should not cause the pond level to rise more than 14 18 inches above the control elevation. 15 4. The littoral zone shall be gently sloped (6:1 or flatter) out to a 1 0 point 2 feet below the bleed down or-control elevation. 17 The littoral zone shall contain at least 4 inches of suitable soil, 18 preferably wetland topsoil containing a seed source of desirable native 19 aquatic plants. 20 6. Mulching or planting of the littoral zone is required. -Atleast one- 21 third of the littoral zone shall be planted. Eighty-five percent coverage 22 of the littoral zone by suitable aquatic plants is required within the first 23 year of operation. Replanting shall be required if coverage falls below the C-24 85 percent level. Native vegetation must be maintained in the littoral Z-one 11 CODING: Words in underlined are additions; Words in strticit threttqK type are deletions from eKiSting law. .1 as part of the system's operation and maintenance. Undesirable species such 2 as cattail and exotic plants shall be limited to 10 percent or less of the 3 total cover and shall be removed when they exceed this. 4 (d) A maximum depth of B-10 feet below the invert of the bleed down device 5 shall-be planned for the permanent pool unless the applicant affirmatively. 6 demonstrates that the deeper-dejoth2 will not cause anaerobic conditions in 7 the bottom sediments and water. Excavation shall not breach an aquitard 8 such that it allows lesser quality water to pass, either way between the two 9 systems. Where an aquitard is not present, the pond shall not be excavated 10 to within two feet of the underlying limestone which is part of a drinking 11 water aquifer. 12 (e) Dimensional criteria (as measured at or from the control elevation): 13 1. Area 0.5 acre minimum. 14 2. Width 100 feet minimum for linear areas in excess of 200 feet length. 15 Irregular shaped areas may have naCrower reaches but should average at least 16 100 feet. 17 3. Length to width ratio - 2:1 minim-um. 18 4. Side slooes shall '02 no steeper than 4:1 out to a depth of 2-, feet 19 below the control elevation. .Do M 'nlet structures sha.11 be designed to dissipate the energy of water 21 entering the pond. Baffles are the most commonly used structures for such 22 purposes. Inlets shall not be located near the outlet so as to vreyent 23 short circuiting and provide the longest possible flow path. 24 ,q) Facilities 'that are riotential sources for oil and grease contamination 12 CODING: Words in underlined are additions; Words in struck* through type are deletions from existing law. 1 must include a skimmer or other mechanism to prevent these substances from 2 leaving the facility. 3 (h) Erosion and sediment control practices must be used to retain sediment 4 on site during construction. Sediment accumulations in the pond from 5 construction activities shall be removed to prevent loss of storage volume. 6 (i) A notice shall be posted warning residents of potential water borne 7 disease that may be associated with body contact with water in these 8 facilities. 9 (j) Perimeter maintenance and operation easements of twenty feet minimum 10 width and slopes of 4:1 (horizontal:vertical) or flatter shall be provided 11 beyond the control elevation water line. 12 (k) Bleed down devices incorporating dimensions smaller than three inches 13 minimum width or less than 20 degrees for "v" notches shall include a device 14 to eliminate clogging. Such devices include baffles, grates, pipe elbows, 15 etc. 13 CODING: Words in underlined are additions; Words in strike through type are deletions from existing law. 3 4 5 6 7 8 pe++utent-adsorption-capecity-of-the-f*iter7 9 14 15 16 ----- 17 19 20 ----- 23 ----- '24 14 CODING: Words in underlined are additions; Words in struck through type are deletions from existing law. 4 5 itbseqiient-sedilentatiOn-Of-the-baginS7 6 7 8 1.7 14 precticesr I= 10 17 48 .al 24 15 CODTNG: Words in underlined are additions, Words in struck through type are deletions from existing law. 2 Specific Authority: 403.061, 403.912, F.S. Law Implemented: 403.021, 403.061, 403.101(l), F.S. 4 History: New 1-26-84, Amended 3-28-84, 5-8-85. 5 6 17-25.027 Legal Operation/Maintenance Entity Requirements. 7 (1) The following entities may operate and 8 maintain 9 that a stormwater discharge facility 10 compliance with the requirements of this chapter and other Department rules 11 regulations: 12 (a) local governmental units,__including counties or municipalities, or 13 Municipal Service Taxing Units. 14 (b) active water control districts pursuant to Chapter 298, Florida 15 Statutes.,_ or drainage districts created by special act, or Community 16 Development Districts pursuant to Chapter 190 Florida Statutes, or Special 17 Assessment Districts pursuant to Chapter 170 Florida Statutes. is (c) state or federal agencies. 19 (d) duly constituted stormwater, communication, water, sewer, 20 electrical or other public utilities. 21 (e) profit or non-profit corporations including homeowners 22 associations, property owners associations, condominium owners associations 23 or master associations shall be acceptable only under certain conditions 24 that ensure that the corporation has the financial, legal and administrative 16 CODING: Words in underlined are additions; Words in struck through type are deletions from existing law. 1 capability to provide for the long term operation and maintenance of the 2 stormwater discharge facility. 3 (2) The property owner or developer normally is not acceptable as a 4 responsible entity when the property is intended to be sold to third 5 parties. However, the property owner or developer may be acceptable under 6 one of the following circumstances: 7 1. Written proof in the appropriate form by either letter or 8 resolution, that a governmental entity or such other acceptable entity as 9 set forth in paragraphs (a)-(c) above, will accept the operation and 10 maintenance of the stormwater management and discharge facility at a time 11 certain in the future. 12 Bonding or other assurances sufficient to operate and perform 13 anticipated maintenance on stormwater facilities. 14 (3) Entity Requirement. (a) if a Homeowner, Property Owner, Condominium or Master Association 16 is proposed, the owner or developer must submit the Articles of 17 Incorporation, Declaration , Restrictive Covenants, Deed Restrictions or such 18 other organizational operational documents affirmatively taking 19 responsibility for, the operation or maintenance of the stormwater discharge 20 facility. 21 (b) the Association shall have sufficient powers reflected in its 22 organizational or operational documents to: 23 1. operate and maintain the stormwater management system and the 24 stormwater discharge facility as-exempted or permitted by the Department. 17 CODING: Words in underlined are additions; Words in strike through type are deletions from existing law. 2. establish rules en1d-regt1+etie"-9- assess members. 3 4. contract for services (if the Association contemplates employing a 4 maintenance company) to provide the services for operation and maintenance. 5 5. the Association shall exist in perpetuity; however, if the 6 Association is dissolved, the Articles of Incorporation must provide that 7 the stormwater management system and discharge facility shall be 8 operated and maintained as-interva"ced by an entity as set forth in paragraph 9 (1) of this rule. 10 (4)+B* Phased Projects. 11 (a) if an Operation/Maintenance entity is proposed for a project which 12 will be constructed in phases, and subsequent phases will use ut-i-lize the 13 same storawater management facilities as the initial phase or phases, the 14 entity shall have the ability to accept responsibility for the 15 operation/maintenance of stormwater discharge facility for future phases of 16 the project. 17 (b) if the development scheme c ontemplates independent 18 operation/maintenance entities for different phases, and the stormwater 19 management system is integrated throughout the project, the entities, either 20 separately or collectively shall have the responsibility and authority to 21 operate and maintain the stormwater management system and discharge facility 22 for the entire project. That authority shall include cross easements for 23 stormwater management and the ability to enter and maintain the various 24 facilities, should any sub-entity fail to maintain a portion of the 18 CODING: Words in underlined are additions; Words in -3ti^ttelt through type are deletions from existing law. 1 stormwater management system or discharge facility within the project. 2 (5) The applicant shall be an acceptable entity from the time 3 construction begins until the stormwater discharge facility is dedicated to 4 and accepted by an established legal entity pursuant to (1) above. The 5 applicant shall provide proof of the existence of an entity pursuant to (1) 6 above or of the future acceptance of the facility by an entity described in 7 (1) above prior to initiating construction. 8 (6) The provisions of this section shall become effective on October 9 1, 1985. 10 Specific Authority: 403.061, 403.087, 403.088, F.S. 11 Law Implemented: 403.021, 403.061, 403.087, 403.088, 403.182, F.S. 12 History: New 5-8-85, Amended 13 14 17-25.030 Exemptions. 15 (1) The following types of new stormwater discharge facilities are 16 exempt from the notice and permit requirements of this chapter. 17 (a) facilities designed to accommodate only one single family dwelling 18 unit, duplex, triplex, or quadruplex, provided the single unit, duplex, 19 triplex or quadruplex is not part of a larger common plan of development or 20 sale; 21 (b) facilities which are designed to serve single family residential 22 projects, including duplexes, triplexes and quadruplexes, if they are 23 less than 10 acres total land area and have less than 2 acres 24 impervious surface provided that the facilities 19 CODING: Words in underline are additions; Words in struck through type are deletions from existing law. 1 1. comply with all regulations or ordinances applicable to stormwater 2 management and adopted by a city or county; and 3 L:-,. are not part of a larger common plan of development or sale; and 4 3. discharge into a storawater discharge facility exempted or permitted 3 by the Department under this chapter which has sufficient capacity and 6 treatment capability as specified in this chapter and is owned, maintained, 7 or operated by a city, county, special district with drainage 8 responsibility, or water management district; however, this exemption does 9 not authorize discharge to a facility without the facility owner's prior 10 written consent-,-ar. 12 13 14 15 (c) stormwater discharge facilities whose functioning treatment 16 components consist entirely of swales. However, this exemption is valid 17 only if the swale, as constructed, meets or exceeds the requirements 18 specified in Section 17-25.020(16) and Section 17-25.025(5). (d) facilities which discharge into a regional stormwater discharge 20 facility which is permitted pursuantto Section 17-25.040 where the 21 appropriate freatment criteria specified in this chapter and applied to the - permitted regional facility are met by the discharge; however, this 23 exemption does not authorize discharge to the permitted regional facility Q4 without the facility owner's prior written consent. 20 CODING: Words in underlined are additions; Words in struck through type are deletions from existing law. 1 (e) facilities for, agricultural lands, provided those facilities are part of an approved Conservation Plan; however, if the Conservation Plan is 3 not implemented according to its terms, this exemption shall be void; and 4 (f) facilities for silvicultural lands, provided that the facilities are constructed and operated in accordance with the Silviculture Best 6 Management Practices Manual (1979), published by the State of Florida, 7 Department of Agriculture and Consumer Services, Division of Forestry, which 8 is adopted and made a part of this rule by reference. A copy of this manual 9 may be obtained by writing the Department of Agriculture, Division of 10 Forestry, 3125 Conner Boulevard, Tallahassee, Florida, and may be inspected 11 at all Department of Environmental Regulation offices. CODING: Words in underline are additions; Words in struck through type are deletions from existing law. 2 3 4 5 6 7 9 12 13 14 15 16 17 18 .9 .2-2 23 24 22 CODING: Words in underlined are additions; Words in -struck througrh type are deletions from existing law. 3 4 tne-hotr-detigr-itors7 5 Exemptions for Artificial Systems Used for Urban Stormwater 6 Conveyance or Renovation. 7 (a) The Secretary shall, upon the petition of an affected person or 8 permit applicant, and after public notice in the Florida Administrative 9 Weekly and in a newspaper of general circulation in the area of the waters 10 affected and after opportunity for public hearing pursuant to Chapter 1*20, 11 Florida Statutes, issue an Order for the duration of the permit specifically 12 exempting from Class III criteria artificially created waters of the state 13 which are upstream of man-made, discharge control systems controlled by the 14 affected person or permit applicant and which are primarily for the 15 conveyance or the retention$ detention, and treatment of urban stormwaters. 16 Such Order shall only be issued after affirmative demonstration by the 17 Petitioner of the following: is 1. reasonable assurance has been provided that the discharge will not 19 --ause a violation of any applicable water quality standards downstream from .:,o the discharge control system; and, 2. waters shall not be degraded below the minimum standards prescribed for all waters at all times in Section 17-3.051, F.A.C.; and, .a-3 3. granting the exemption is clearly in the public interest; and, 24 4. compliance with presently specified criteria is unnecessary for the 23 CODING: Words in underlined are additions; Words in -3trtek throtgh type are deletions from existing law. I protection of public water supplies or human health. (b) The*Petitioner shall affirmatively demonstrate those standards 3 which the Petitioner believes more appropriately apply to the waters for 4 which the exemption is sought. 5 (c) The Secretary shall specify, by Order, only those criteria which 6 the Secretary determines to have been demonstrated by the preponderance of 7 competent substantial evidence to be more appropriate. 8 (d) The Department shall modify the Petitioner's permit consistent with 9 the Secretary's Order. 10 Specific Authority: 403.061, 403.087, 403.088, 403.504, F.S. 11 Law Implemented: 403.021, 403.061, 403.087, 40,73.088, 403.121, 403.141, 12 40.3.161, 403.182, 403.502, 403.702, 403.708, F.S. 13 History: Formerly 17-4.248, Amended and Renumbered 2-1-82, Amended 3-30-82, 14 1-26-84, 3-28-84, 5-8-85, 8-30-88, Formerly 17-25.03. 15 16 17-25.035 General Permit for Stormwater Discharge Facilities. 17 (1) A general permit is hereby granted to any persGn For the --07,Str-UCtiOn 18 and operation of the following types of new stormwater discharge facilities 19 as set forth in this section provided that notice to the Department pursuant 20 to Rule 17-4.5313 is submitted on Form 17-1.215(2) Revised April 1985. This 21 Qeneral permit shall not expire and shall not' be subject to Section 17- 4.540(13) unless suspended or revoked in accordance with Section 17- 23 4.530(5): 24 24 CODING: Words in underlined are additions; Words in strmek threegh type are deletions from existing law. 7 (a) facilities which discharge into a stormwater discharge facility 8 which is permitted pursuant to Section 17-25.040 or Section 17-25.035(l)(b) 9 (c) or (e). F.A.C. or which was previously approved pursuant to a 10 noticed exemption under Section 17-25.030 where the appropriate treatment 11 criteria specified in this chapter and applied to the permitted or exempt 12 facility are not exceeded by the discharge; however, this does not authorize 13 discharge to the permitted or exempt facility without the facility owner's 14 prior written consent; or, (b) facilities which provide retention, or 16 of use an underdrain system designed in accordance with Section 17-25.025() 17 and (2) or (4) to percolate the runoff from the first one inch of rainfall; 18 or, as an option, for drainage areas less 19 than 100 acres, facilities which 20 of so treat the first one half inch of runoff. However, 21 facilities which directly discharge to Outstanding Florida Waters shall 22 Provide additional treatment pursuant to Section 17-25.025 (1)(c), F.A.C.; or, (c) facilities designed pursuant to Section 17-025.025(5) F.A.C. which 25 CODING: Words in underlined are additions; Words in struck through type are deletions from existing law. 1 Provide extended wet detention for the first inch of runoff, or the total 2 runoff of 2.5-inches times the acreage of impervious surface associated with 3 all contributory areas, whichever is-greater. However, facilities which 4 discharge directly to Outstanding Florida Waters shall provide additional 5 treatment pursuant to Section 17-25.025 (1)(c): or, 6 (d)+c* modification or reconstruction by a city, county, state agency, 7 special district with drainage responsibility, or water management district 8 of an existing stormwater management system which is not intended to serve 9 new development, and which will not increase pollution- loading, or change 10 points of discharge in a manner that would adversely affect the designated 11 uses of waters of the state; or, 12 (e)4d* facilities of stormwater management systems that include a 13 combination of management practices including but not limited to retention 14 basins, swales, pervious pavement, landscape or natural retention storage 15 that will provide for the percolation of the runoff from a three-year 16 one-hour design storm. 17 (2) Except as Provided in subsection (1). this general permit is subject to 18 the general conditions of Rule 17-4.540 and the followinn special 19 conditions: 20 (a) the stormwater discharQe facilities shall be desiQned and c2nstructed 21 in accordance with the design and performance standards in Secti'on 17- 25,025, F. A. C. and, 23 (b) adeauate provisions have been made for operation and maintenance of the 24 proposed facility: and, 26 CODING: Words in underlined are additions; Words in struck through type are deletions from existing law. 1 (c) the design, construction and operation of the stormwater discharge 2 facility shall comply with all other applicable requirments of this 3 Chapter; and, 4 (d) the permitte shall submit appropriate design analysis, calculations, 5 drawings, specifications and other information necessary to describe. 6 document and verify that the proposed stormwater discharge facility 7 qualifies for the general permit; and, 8 (e) the permitte or engineer of record shall file with the Department 9 within 30 days after the facility's completion of construction record 10 drawings and certification that the new stormwater discharge facility, as 11 constructed, qualifies for the general permit. 12 (f) this general permit does not relieve the permitte of the 13 responsibility for obtaining a dredge and fill permit where it is required. 14 Specific Authority: 403.814 (1), 403.912, F.S. 15 Law Implemented: 403.061, 403.087, 403.088, 403.121, 403.141, 403.161, 16 403.182, 403.502, 403.702, 403.908, 403.814, F.S. 17 History: New 5-8-25, Amended 18 Previously numbered as 17-4.71. Formerly 17-4.710 19 20 17-25.040 Constructed Permit Requirments for New Stormwater Discharge 21 Facilities. 22 (1) Any person intending to construct a new stormwater discharge 23 facility, except as exempted pursuant to Section 17-25.030, Flordia 24 Administrative Code, or as permitted noted in Section 17-25.035, or as 27 CODING: Words in underlined are additions; Words in struck through type are deletions from existing law. I permitted in Section 17-25.042, or as noted in Section 17-2-'5.060, Florida 2 Administrative Code, shall apply to the Department for a construction 3 permit, using forms provided by the Department, prior to commencement of 4 construction of the stormwater discharge facility. In a geographical area 5 where delegation has occurred, pursuant to Section 17-25.050, Florida 6 Administrative Code, application shall be made pursuant to the provisions of 7 the rules of the entity receiving the delegation. 8 (2) Construction of a new stormwater discharge facility shall not be 9 undertaken without a valid construction permit as required pursuant to this 10 section. 11 (3) Modifications to an existing stormwater management system that will 12 increase the discharge of the storawater discharge facility beyond its 13 previously designed and constructed capacity, or increase pollution loading, 14 or change points of discharge, except for emergency repairs, are considered 15 new storewater discharge facilities for purposes of this chapter. 16 (4) A construction permit may be issued to the applicant, upon such 17 conditions as the Department may direct, only if the applicant affirmatively IS provides the Department with reasonable assurance based on plans, test 19 results and other information, that the construction, expansion, '_0 modification, operation, or activity of the storawater discharge facility Ell will not discharge, emit, or cause pollution in contravention of Department 2.--, standards, rules or regulations. 23 (5) A showing by the applicant that the facility design will provide 24 treatment equivalent to either retention, or detention v#+th-f-i+tt-et+an, as 28 CODING: Words in underlined are additions; Words in struck- through type are deletions from existing law. 1 described in Section 17- 4 25.035 (1)(b) or (c) F.A.C. shall be presumed to provide reasonable 5 assurance pursuant to subsection (4) above, provided that adequate 6 provisions have been made for operation and maintenance of the proposed 7 facility. However, facilities which directly discharge to Outstanding 8 Florida Waters shall provide additional treatment as specified in Section 9 17-25.025 (1)(c) F.A.C. 10 (6) Regional stormwater discharge facilities shall be permitted upon 11 application and a showing by the applicant that: 12 (a) the facility will provide treatment equivalent to either retention, 13 or detention 14 15 as described in Section 16 17-25.035 (1) (b) or (c) F. A. C. , and, 17 (b) facilities which directly discharge to Outstanding Florida Waters 18 shall provide additional treatment as specified in Section 7-25.025 19 (1)(c) F.A.C.; and, 20 (c) the facility is designed to meet the treatment criteria specified 21 in (a) or, (b) above for projected future land use conditions and associated 22 stormwater volumes; and, 23 (d) the owner of the facility notifies the Department on a semi-annual 24 basis, on forms provided by the Department, of all new projects and their 29 CODING: Words in underlined are additions; Words in struck through type are deletions from existing law. 1 associated stormwater volumes that have been allowed to discharge stormwater into the regional facility and certifies that the maximum allowable treatment volume of stormwater has not been exceeded..L and, 4 (e) adequate provisions have been made for the operation and maintenance of the proposed facility. 6 (7) In otherwise determining whether reasonable assurance has been 7 provided, the Department shall, where appropriate, consider: a (a) whether best management practices are proposed, such as those 9 described in "A Manual of Reference Management Practices for Urban 10 Activities (July, 1978)11, "A Manual of Reference Management Practices for 11 Construction Activities (December, 1977)", "A Manual of Reference Management 12 Practices for Agricultural Activities (November 1978)", "Silviculture Best 13 Management Practices Manual (1979)", "Stormwater Management Manual (October 14 1981)", or best management practices d.escribed in manuals adopted by the 15 Environmental Regulation Commission pursuant to Section 17-25.050, or other 16 appropriate best management practices. The manuals listed above by name are azoptel_' ant made a pa-t of @-his rule by reference. Copies of these 18 documents may be obtained by writing the Department, and may be inspected at 19 all Department offices; (b) the public interest served by the discharge; 21 %c) the probable efficacy and costs of alter-native controls; @d) whether the proposed water quality benefits are reasonably related E3 to the costs of the controls; and 24 (e) whether reasonable provisions have been made for the operation and 30 CODING: Words in underlined are additions; words in strtzek through type are deletions from existing law. I maintenance of the proposed facility. Specific Authority: 403.031, 403.061, 403.912, F.S. Law Implemented: 403.021, 403.0-31, 403.061, 403.087, 403.088, F.S. 4 History: Formerly 17-4.248, Amended and Renumbered 2-1-82, Amended 3-30-82, 1-26-84, 3-28-84, 5-8-85.-- Previously numbered as 6 17-25.04. 7 a 17-25.042 Permit Requirements for Wetlands Stormwater Discharge 9 Facilities. 10 (1) The wetlands stormwater discharge facility performance standards 11 and other provisions relating to such facilities are an initial but 12 necessary step by the Department in a field in which there exists limited 13 knowledge. In an effort to further refine the state's wetlands stormwater 14 discharge facility policies, monitoring data and other pertinent information 15 relating to the performance standards will be collected and analyzed and 16 periodic reports of the results of this monitoring shall be made available 17 to the public. The DEPEXt-ment must attempt to ensure that the wetlands 18 stormwater discharge facility is compatible with the ecological 19 characteristics of the wetlands utilized for stormwater treatment and to 'L.0 ensure that water quality standards will not be violated by discharges from :-l wetlands stormwater discharge facilities. To achieve these goals, specific ,a2 performance standards are set forth in this chapter. However, recognizing 23 the complexities and concerns of implementing wetlands stormwater treatment 24 performance standards, the Department shall review the monitoring data and 31 CODING: Words in underlined are additions; Words in st-rdek @h-renqh type are deletions from existing law. 1 other pertinent information on a regular basis. The Department shall 2 present the information to the Commission at a public hearing no later than 3 April 1, 1989. Unless the Commission affirmatively determines that the 4 performance standards remain appropriate, or amends them as it deems 5 necessary, Section 17-25.042(6) shall be repealed effective April 1, 1989. 6 (2) The wetlands to be used for stormwater management are those: 7 (a) which are connected to other waters by artificial watercourses; or a (b) which are connected to other waters solely by an intermittent 9 watercourse. 10 (3) Any person who owns or has written authorization to use a wetland 11 for stormwater treatment shall apply to the Department for a wetlands 12 stormwater discharge facility permit, using forms provided by the 13 Department, and shall receive such permit prior to commencement of 14 construction of the stormwater discharge facility. The application shall be 15 processed by the Department according to the procedures of Chapter 17-4, 16 F.A.C. 17 %4) A wetlands stormwater dischage facility permit nay be islsued to 18 the applicant, upon such conditions as the Department may diret, only if 19 the applicant affirmatively provides the Department with reasonable 20 assurance based on plans, test results or other information, that the 21 construction, operation, or aCtivity of the stormwater discharge facility 22 shall not emit, or cause pollution in downstream waters in contravention of 23 Department standards, rules or regulations. 24 (5) In the review of wetlands stormwater discharge facility permit 302 CODING: Words in underlined are additions; Words in triek tret type are deletions from existing law. 1 aPP@icatlo-ns, the Department shall consider the following: (a) compliance of the wetlands stormwater discharge facility permit with the performance standards specified in Section 17-25.042(6), F.A.C. 4 (b) if the applicant is unable to show compliance with the performance 5 standards in Section 17-25.042(6), the applicant may qualify for, a wetlands 6 stormwater discharge facility permit using alternative design and 7 performance standards approved by the Department provided that the use of 8 the wetlands is compatible with the ecological characteristics of the 9 wetland and the applicant complies with Section 17-25.04E%4), F.A.C. 10 (c) if the applicant proposes to dredge or fill in the wetlands used 11 for storowater treatment, the Department in its review of the permit 12 application shall evaluate the adverse effects of the dredging or filling on 13 the treatment capability of the wetland. 14 (6) A showing by the applicant that the wetlands stormwater discharge 15 facility design complies with the performance standards listed below shall 16 create a presumption in favor of the issuance of the permit: ,7 (a) the facility complies with the requirements of Section is 17-251.0@;0(2), F.A.C. 19 (b) the facility is part of a comprehensive stormwater management ,01 system that utilizes wetlands in combination with other best management al Practices to provide treatment of the runoff from the first one inch of rainfall; or, as an option for projects or project subunits with drainage areas less than 100 acres, the first one-half inch of runoff. Those .a.Lk facilities which directly discharge to Outstanding Florida Waters shall 33 CODING: Words in under-lined are additions; Words in strttek through type are deletions from existing law. 1 provide additional treatment as specified in Section 17-25.0-5(9), F.A.Z. 2 (c) the utilization of wetlands for stormwater treatment shall not 3 adversely affect the wetland by disrupting the normal rarge of water level 4 fluctuation of the wetland as it existed prior to construction of the 5 wetlands stormwater discharge facility. Normal range of water level 6 fluctuation will be defined as the maintenance of the fluctuating water 7 surface changes between the normal low water and the normal high water of 8 the wetland system so as to prevent the desiccation or over impoundment of 9 the wetland. The Department shall use water level data, lines on the trees, 10 adventitious roots or other hydrological and biological indicators to 11 determine the normal low and normal high water levels. Upland detention may 12 be necessary to attenuate peak flows and meet the water level fluctuations 13 specified above. When the normal range of water level fluctuations has been 14 artificially altered, the Department shall establish an acceptable range of 15 water level fluctuation based on historical information as to the pr2vious 16 size and nature of the wetlands, if available. If such information is not 17 availab-le, the range of water level fluctuation shiall bje tteri,.ed fr-om 18 scientific principles or from analysis of other natural wetland systems in 19 the vicinity. 20 (d) the wetlands stormwater discharge facility must be able to contain 21 the runoff as specified in Section 17-25.042(6)(b), F.A.C.- vjith'@.-,, the 22- wetlands. Where the wetlands stormwater discharge facility alone cannot 23 contain the runoff volume specified in (b) above within the water level 24 ranges specified in (c) above, the other best management practices of the 34 CODING: Words in underlined are additions; Words in itrtteit thrvagK type are deletions from existing law. 1 stormwater management system shall not adversely affect the ability of the 2 wetlands stormwater discharge facility from meeting the requirements of this 3 section. The design features of the facility shall maximize residence time 4 of the stormwater within the wetland. The outfall structure shall be 5 designed to bleeddown the volume specified in Section 1725.04'"'(6)(b) in no 6 less than 120 hours with no more than one-half of the volume to be 7 discharged within the first 60 hours. 8 (e) storawater shall be discharged into the wetlands utilized so as to 9 minimize the channelized flow of stormwater by employing methods including, 10 but not limited to, sprinklers, overland flow or spreader swales. 11 (f) facilities which receive stormwater from areas which are a 12 potential source of oil and grease contamination in concentrations exceeding 13 applicable water quality standards shall include a baffle, skimmer, grease 14 trap or other mechanism to minimize the amounts of oils and greases entering 15 the wetlands utiliZed for, stormwater treatment. 16 (g) erosion and sediment controls shall be used during construction and 17 operation of the facility to minimize sedimentation of the wetlands utilized 18 for stromwater treatment. The sediment control mechanism shall be built in 19 the uplands and be of sufficient size and design to minimize resuspension 20 and discharge of collected sediments into the wetland and to allow for 21 recurring maintenance removal of sediments without adverse impact to the 22 wetland. 23 (7) The operation phase of this permit shall not become effective 24 until: 35 CODING: Words in underlined are additions; Words in struck through type are deletions from existing law. I (a) an engineer certifies that the wetlands stormwater discharge 2 facility has been constructed in accordance with the design approved by the Department. Within 30 days after completion of construction of the wetlands 4 stormwater discharge facility, the permittee shall submit the certification 5 and two copies of as-built drawings and notify the Department that the 6 facility is ready for inspection. The certification prepared by an engineer 7 (not necessarily the project design engineer but one who has been retained 8 or employed by the permittee to provide professional engineering services 9 during the construction phase of project completion) shall be made on forms 10 provided by the Depaf@tment. The engineer shall certify therein that the 11 facility has been constructed substantially in accordance with approved 12 plans and specifications, and that any deviations will not prevent the 13 facility from functioning in compliance with the requirements of this 14 chapter. The engineer shall note and explain substantial deviations from 15 the approved plans and specifications. The certification shall be based 16 upon on-site observation of construction (scheduled and conducted by the 17 engineer or by a project rep-resentative under his direct supervision) for 18 the purpose of determining if the work was completed in compliance with 19 approved plans and specifications; 20 (b) the permittee submits to the Department documentation that adequate -all provisions have been made for the operation and maintenance of the facility 22 and for meettng any special permit conditions, such conditions may include 23 water quality monitoring. 24 (8) In order to establish a reliable, scientifically valid data base 36 CODING: Words in underlined are additions; Words in strticit t-hrough type are deletions from existing law. 1 upon which to evaluate the performance standards and the performarce of the wetlands stormwater discharge facility, a monitoring program may be required. Monitoring programs shall provide the Department with comparable 4 data for different types of wetlands and drainage designs. Data to be collected may include, but not be limited to, sedimentation rate, sediment 6 trace metal concentrations, sediment nitrogen and phosphorus concentrations, 7 changes in the frequency, abundance and distribution of vegetation and 8 inflow and outflow water quality for nutrients, turbidity, oils and greases, 9 bacteria and other parameters related to the specific site conditions. 10 Inflow and outflow water quality parameters will be monitored on such storm 11 event occurrences as established by the Department based on a site specific 12 basis. Analytical data must be provided using standard procedures 13 prescribed by a Department approved Quality Assurance Plan and reported in a 14 format provided by the Department. The Department shall eliminate the 15 requirement to continue the monitoring program 1,pon its determination that 16 no further data is necessary to evaluate the performance standards or ensure 17 compliance with the performance sta)Jards a-,id pl aq":Ie ,ater 18 standards. 19 (9) A permit issued pursuant to this section shall - valid for a 20 period of up to five years from the date of issue unlEs an earlier renewal 1 date is specified by the Cepartment. Both constructin anzj operation of the facility will be covered by zne initial permit- (10) If the facility will continue to operate after the expiration date 24 of the initial permit, the permit must be renewed. A permit may be renewed 37 CODING: Words in ulnderllin.-d. are additions; Words in st,h- t-ii-trettgot ty.ne are deletions from existing law. 1 upon submittal to the Department of a certification that the facility is 2 operating in compliance with the performance criteria of this section and is 3 not causing water quality violations of downstream waters. 4 The certification shall be treated as an application for permit renewal for 5 purposes of the time provisions specified in Section 120.60, F.S. 6 (11) The permit may be transferred only pursuant to Florida 7 Administrative Code Rule 17-4.120. Upon transfer, all original permit 8 conditions, schedules and criteria continue to be applicable. 9 Specific Authority: 403.061, 402.912, 403.918, F.S. 10 Law Implemented: 403.087, 403.088 403.918, 403.919, 403.921, 403.924, 11 403.927, 403.929, F.S. 12 History: New 5-8-85. 13 14 17-25.050 Delegation. 15 (1) The Department may, after notice in the Florida Administrative 16 Weekly pursuant to the provisions of Chapter 120, Florida Statutes, delegate 17 to either local governments or water management districts seeking such 18 ydelegation, as provided in Sections 403.182, 403.812, Florida Statutes, and 19 this section, the authority to process notices, issue or deny permits, 20 initiate enforcement actions, and monitor for compliance as provided in 21 Sections 403.182, 403.812, Florida Statutes, and this section. Delegation 22 shall not include the authority for a local government or a water management 23 district to issue or deny permits for its own activities except replacement 24 items or maintenance of existing facilities. 38 CODING: Words in underlined are additions; Words in struck through type are deletions from existing law. (2) A water management district which has been delegated stormwater regulation pursuant to this section may establish alternative requirements which protect the designated uses of waters of the state provided that the 4 alternative requirements are approved by the Environmental Regulation 5 Commission pursuant to Section 403.804, Florida Statutes and have been 6 incorporated by reference as department stormwater rules in 17-25.090, 7 F.A.C. These alternative requirements incorporated as department rules 8 shall apply in lieu of the provisions of this Chapter in the area of 9 delegation, and applicable surface water management and stormwater permit 10 discharge standards shall be applied in one permit proceeding. Following 11 delegation to a water management district, those activities within the 12 district that meet the exemption criteria of Section 17-25.030(l) shall be 13 exempt from the requirements of Section 17-4.242 regarding Outstanding 14 Florida Waters. 15 (3) A local government which has been delegated stormwater regulation 16 pursuant to this section may also establish by rule, ordinance or, local 17 law, alternative requirements provided the Department datermines such 18 alternative requirement's are compatible with, or more stringent than, those 19 imposed by this chapter. 20 Specific Authority: 403.061, 403.062, 403.182, 403.805, 403.812, F.S. 21 Law Implemented : 403.021, 403.061, 403.062, 403.182, 403.805, 403.812. F.S. 22 History: Formerly 17-4.248, Amended and Renumbered 2-1-82, Amended 1-26-84, 23 5-8-85. Previously numbered as 17-25.05. 24 39 CODING: Words in underlined are additions; Words in struck through type are deletions from existing law. 1 17-25.060 Relationship to Other Permitting Requirements. 2 (1) Whenever the construction of a new stormwater discharge facility 3 requires that a dredge or fill permit be secured pursuant to Sections 4 17-12.150 or 17-12.160 or Chapter 17-12, Florida Administrative Code, or 5 whenever other rules of the Department require that a permit, section 401 6 federal Clean Water Act certification or other certification be secured, all 7 applicable stormwater requirements under this chapter shall be reviewed as 8 part of those permit applications. A separate permit application under this 9 chapter shall not be required. If the applicant requests a separate 10 stormwater permit, the applicant must notify the Department of any other 11 Department permits, exemptions, or certifications which have or will be 12 requested for the project. 13 (2) The permit requirements of Chapter 17-4 or other applicable rules, 14 rather than those of this chapter, shall apply to discharges which are a 15 combination of stormwater and industrial or domestic wastewater or which are 16 otherwise contanineted by non-stormwater sources unless: 17 (a) the stormwater discharge facility is capable of providing treatment 18 of the non-stormwater component sufficient to meet state water quality 19 standards; and 20 (b) the applicant requests that the permit requirements of this Chapter 21 apply. 22 Specific Authority: 403.061, 403.062, 403.087, F.S. 23 Law Implemented: 403.021, 403.061, 403.087, 403.088, 403.101, 402.702, 24 403.708, F.S. 40 CODING: Words in underlined are additions; Words in struck through type are celetions from existing law. 1 History: Formerly 17-4.248, Amended and Renumbered 2-1-82, Amended 1-26-84, 2 5-8-85. Previously numbered as 17-25.06. 3 4 17-25.070 Transferability of Other Chapters. 5 Specific Authority: 403.061, 403.062, 403.087, 403.504, F.S. 6 Law Implemented: 403.021, 403.061, 403.087, 403.088, 403.101, 403.502, 7 403.702, 403.708, F.S. 8 History: Formerly 17-4.248, Amended and Renumbered 2-1-82, Repealed 5-1-82. 9 10 17-25.080 General Provisions. 11 Nothing under this chapter shall preclude: 12 (1) stormwater effects from being considered in the evaluation of other 13 types of permits where such consideration is relevant to a determination of 14 compliance with applicable Department requirements. 15 (2) the legal joinder in a permitting proceeding under this chapter of 16 persons who own at, control unpermitted starmwater discharge systems which 17 comprise a significant portion of the stormwater discharge facility. 18 (3) the Department from taking appropriate legal action including but 19 not limited to the requiring of a permit to prevent the impairment of a use 20 for which a water of the state has been designated under Chapter 17-3, 21 Florida Administrative Code. 22 (4) the Department from entering interagency or interlocal agreements 23 to accomplish the provisions of this chapter. 24 Specific Authority: 403.061, 403.062, 403.087, F.S. 41 CODING: Words in underlined are additions; Words in struck through type are deletions from existing law. 1 Law Implemented: 403.021, 403.061, 403.087, 403.088, 40.121, 403.4, 2 403.161, 403.708, F.S. 3 History: Formerly 17-4.248, Amended and Renumbered 2-1-82. Previously 4 numbered as 17-25.08. 5 6 17-25.090 List of Entities to Which Permitting Pursuant to this Chapter 7 has been Delegated; Addresses; Delegation Documents and Rules Adopted by 8 Reference. 9 (1) South Florida Water Management District; Post Office Box V; West 10 Palo Beach, Florida 33402 11 (a) Surface Water Management Rule; Chapter 40E-4, Florida 12 Administrative Code (March 9, 1983); 13 (b) General Surface Water Management Rule; Chapter 40E-40, Florida 14 Administrative Code (December 1, 1962); 15 (c) "Basis of Review for Surface Water Management Permit Applications 16 within the South Florida Water Management District - May 1986." 17 (d) Nothing in this delegation shall prevent the Department from 18 considering the stormwater impact cf dredging or filling regulated pursuant 19 to 17-12.150 or 17-12.160 or Chapter 17-12, Flzrida Administrative Code, or 20 the District from implementing applicable pvcvisions cf Chapters 17-3 and 21 17-4, Florida Administrative Code. Provided, however, in those cases where 22 the water management district has issued a surface water managment permit 23 pursuant to Chapter 373, Part IV, and this delegation, the Department shall 24 confine its review of stormwater uality impacts solely to those generated 42 CODING: Words in underlined are additions; Words in struck through type are deletions from existing law. 1 by dredging and filling regulated pursuant to Rules 17-12.150 and 17-12.160, 2 Florida Administrative Code. 3 Southwest Florida Water Management District; 2379 Broad Street, 4 Brooksville, Florida 33512. 5 (a) Regulation of Stormwater Discharge, Chapter 17-25, Florida 6 Administrative Code, except for Section 16-25.042. 7 (a) Management and Storage of Surface Waters Rule: Chapter 40D-4, 8 Florida Administrative Code (March 1. 1988); 9 (b) General Surface Water Management Permits Rule; Chapter 40D-40, 10 Florida Administrative Code (March 1. 1988); 11 (c) Basis of Review for Surface Water Management Permit Applications 12 Within the Southwest Florida Water Management District (March 1. 1988). 13 (d) When a proposed stormwater discharge facility is associated with 14 activities which require a dredge and fill, industrial waste, domestic 15 waste, solid waste or hazardous waste permit from the Department, stormwater 16 permit applications and exeption general permit notices must be submitted 17 to the Department and the Department shall regulate such stormwater 18 discharge facilities within the District. 19 Scwannee River Water Management District; Route 3, Box 64, Live 20 Cak, Florida 32060. 21 (a) Surface Water Management and Works of the District Rule; Chapter 22 40B-4, Florida Administrative Code (August 15, 1985). 23 (b) the permitting of wetlands storawater discharge facilities pursuant 24 to Section 17-625.042 is not delegated to the District. 43 CODING: Words in underlined are additions; Words in struck through type are deletions from existing law. 1 (4) St. Johns River Water Management District, Post Office Box 1429, 2 Palatka, Florida 32078. 3 (a) Regulation of Stormwater Discharge, Chapter 40C-42, Florida 4 Administrative Code (February 1986). 5 (b) The permitting of wetlands stormwater discharge facilities pursuant 6 to Section 17-25.042; 7 (c) When a proposed stormwater discharge facility is associated with 8 activities which reuire an industrial waste, domestic waste, solid waste, 9 or hazardous waste permit from the Department, stormwater permit 10 applications and exemption general permit notices must be submitted to the 11 Department and the Department shall regulate such stormwater discharge 12 facilities within the District. 13 Specific Authority: 403.061, 403.812, F.S. 14 Law Implemented: 403.021, 403.061, 403.812, F.S. 15 History: Formerly 17-4.248, Amended and Renumbered 2-1-82, Amended 3-30-82, 16 1-26-84, 3-26-84, 5-8-85, 5-14-86, and 5-25-86, and 17 Previously numbered as 17-25.09. 18 19 17-25.100 Effective Date. 20 Specific Authority: 120.54(12)(a), 403.061(7), F.S. 21 Law Implemented: 120.54(12)(a), 403.051 F.S. 22 History: Formerly 17-4.248, Amended and Renumbered 2-1-82, Repealed 1-26-84. 23 24 17-25.801 General Permit for New Stormwater Discharge Facilities. 44 CODING: Words in underlined are additions; Words in struck through type are deletions from existing law. 4 6 7 12 13 14 15 I t i+t-stienT-Of -the 0 f 0- att s art' i n; - Fiz r i= a-- We-. rt --5 h ei prvv ie - st@ti e r, al - t reatmen t- ptirstart-te .24 45 CODING: Words in u7Mderliomedj are additions; Itorcis thr-eyttqh type are Ueletions from existing la;4. 5 4d+-f 7 9 one-heur-desigM-StOrIM7 10 12 canditieftst 14 15 48 4 9 20 23 deter+ber-docutent-and-verify-that-the-proposed-steremater-diseharge 24 46 CODING: Words in underlined are additions; Words in streek throagh type are deletions from existing law. 4 5 6 7 Specific-Autherityt-488r8f44++T-4k3z379+2r-F7S7 9 4@3r+62T-4@BrSOET-40gr7O2T-403791387-40378+4r-F7S7 12 13 14 15 16 i7 47 CODING: Words in underlined are adti'ticns; Words in strtck throtgh type are deletions from existing law. T It a dIr' 01' Plan *;n C! M g APPENDIX C. Southwest Florida Water Management District Chapter 40D-4 Management and Storage of Surface Waters March 1988 Part A - Surface Water Management Rules I. General A. Southwest Florida Water Management District Authority The Southwest Florida Water Management District was created by Chapter 61-691, Laws of Florida (1961), for purposes of flood control and water conservation. In 1972 the Florida Legislature enacted Chapter 373, Florida Statutes (F.S.), the Florida Water Resources Act of 1972 (Act), which greatly expanded the District's responsibilities from flood control to a full range of water management activities. The Act governs the regulation of all waters in the state, unless exempted by law. Waters in the state are defined to include all water on or beneath the surface of the ground or in the atmosphere. Generally, the purposes for which the Act was adopted are to provide for management of water and related land resources, to promote the conservation, development and proper utilization of surface and groundwater, to provide water storage for beneficial purposes, to prevent damage from floods, soil erosion and excessive drainage, to preserve natural resources, fish and wildlife, and to promote recreational development. The District is governed by a nine-member board which is responsible for the overall administration of District programs, the regulatory program implementing the Act and the development of a water use plan. The District is also divided into nine basins--the Green Swamp, Alafia River, Hillsborough River, Northwest Hillsborough, Coastal Rivers, Pinellas-Anclote River, Withlacoochee River, Peace River and Manasota Basins--which are governed by basin boards; the basin board for the Green Swamp Basin is the District Governing Board. The basin boards fund primary water resource development projects, studies and secondary water control facilities. The Act provides for the establishment of permit programs for the regulation of consumptive use of water, well construction, surface wati'r management systems, artificial recharge and utilization of works or land of the District. Except for artificial recharge and consumptive use, primary regulatory authority resides in the Department of Environmental Regulation with direction to delegate the authority to the water management districts to the maximum extent practicable. This District has been delegated all programs, as well as storm water regulation authority. The District has implemented all the permitting programs authorized by the Act by adopting rules which are published as Chapter 40D of the Florida Administrative Code (F.A.C.). A-1 B. Permitting Procedures The District is governed by Chapters 373 and 120, F.S., and Chapter 40D, F.A.C. Together they provide an administrative framework for the resolution of conflicts among applicants, objectors and the District. Within this framework, if no objections are received and the applicant agrees with the staff's recommendations, the application can usually be considered informally before the Governing Board. If, however, the applicant disagrees with the staff's recommendations, or someone whose substantial interest may be affected objects, a formal hearing may be held either before the Governing Board or before a hearing officer from the Department of Administrative Hearings. In either case, adequate safeguards are provided so that disputes can be resolved judiciously and expeditiously. Upon receipt of an application for an individual or conceptual permit, the District will request within 30 days any necessary additional information. Upon receipt of a complete application, the District will issue or deny the permit within 90 days unless a petition for hearing is filed or the time limitations of Chapter 120, F.S., have been waived by the applicant. C. Permitting of Surface Water Management Systems 1. Statutory Provisions (Part IV, Chapter 373 F.S.) Part IV of the Act deals with surface water management. Generally, permits may be required by the water management districts for construction, alteration and operation of most real property improvements which are designed to control surface waters. An applicant for a surface water management permit must show that the proposed project is consistent with the goals and policies expressed in Declaration of Policy, 373.016, F.S., and State Water Use Plan, 373.036, F.S., that the construction or alteration of the surface water management system will not be harmful to the water resources of the District, and that the operation and maintenance of the system will not be inconsistent with-the overall objectives of the District or harmful to the water resources of the District. 2. Rules of the Southwest Florida Water Management District (Chapter 40D, F.A.C.) Chapter 40D-4, F.A.C., describes the permit requirements for construction, alteration, or operation of surface water management systems. Generally, all impacts to wetlands or construction, alteration or operation of dams, impoundments, reservoirs, appurtenant works or works as defined in the Act require a permit from the District. To satisfy the permit requirement, an applicant must receive an individual permit or A-2 qualify for general permits. Individual permits are issued by the Governing Board upon application and compliance with Part IV of the Act and Chapter 40D-4, F.A.C., with additional criteria for evaluating projects incorporated by reference in Rule 40D- 4.091, F.A.C. Further, additional criteria may be imposed if the project is to be located within an area in which the District has adopted alternate design criteria (see Appendix 6). A-3 ...................................................................... Northwest Florida &ter anagement District Suwannee River Water Management District St. Johns River Water Management District ............ .............................................. Southwest Florida Water Management District Withl4coochee River Basin Southwest Florida Water Management Coastal Rivers District Basin South Florida Water Management District Green Sucinp illsborough Ri Basin N W Hillsborough Basin Basin ...... .............................................. ..... PinilLas-A lote River Alafia River Basin Peace River Basin Boundaries of the Five Manasota --nF, n- Water Management Districts and the Nine SWFWMD Basins ........................ I. .......................................................................... Chapter 40D-4 This Rule sets forth the permit requirements for projects which do not qualify for General Permits under Chapter 40D-40, F.A.C. There are three types of permits issued under Chapter 40D-4, F.A.C.: 1) Conceptual Approvals, 2) Construction Permits, and 3) Operation Permits. Section 40D-4.301, F.A.C., lists the conditions for issuance of permits under the chapter. The specific design criteria.with which a project must comply are incorporated by reference in Rule 40D-4.091, F.A.C., and are reproduced as Part B of this manual. The difference between a conceptual approval and the other permits authorized under this chapter is that a conceptual approval does not authorize any construction of a surface@water management system. A conceptual approval is valid for a period of twol years and a construction permit is valid for three years. An extension of these permits may be granted (see Rules 40D-4.321 and 40D-4.331). The Application Form and Checklist of Information for a project to be permitted under this chapter are included within this Manual. 'The adopted Basis of Review stated six years. At the final adoption hearing for rule amendments to Chapters 40D-4 and 40D-40, F.A.C., the proposal that conceptual approvals expire six years from the date of issuance was not adopted. Therefore, "six" was replaced with "two" to correctly reflect the content of Rule 40D-4.321, F.A.C. A-5 MARCH 1988 MANAGEMENT AND STORAGE OF SURFACE WATERS CHAPTER 4 RULES OF THE SOUTHWEST FLORIDA WATER MANAGEMENT DISTRICT CHAPTER 40D-4 MANAC04MT AND STORAGE OF SURFACE WATERS 40D-4.011 Policy and Purpose 40D-4.131 Times for Receiving 40D-4.021 Definitions Objections and for 40D-4.031 Implementation, Effective Hearing Date and Applicability 40D-4.201 Permit Processing Fee 40D-4.041 Permits Required 40D-4.301 Conditions for Issuance 40D-4.051 Exemptions of Permits '40D-4.052 Request for Exemption 40D-4,321 Duration of Permits (Reserved) 40D-4.331 Modification and Extension 40D-4.053 Conditions for of Permits Exemption 40D-4.341 Revocation of Permits 40D-4.054 Alteration of Exempt 40D-4.351 Transfer of Permits Projects 40D-4.381 Limiting Conditions 40D-4.091 Publications 40D-4.401 Identification Tags Incorporated by 40D-4.411 Completion Report Reference 40D-4.451 Emergency Authorization 40D-4.101 Content of Application 40D-4.461 Inspection 40D-4.111 Notice of Application 40D-4.471 Abatement Form 40D-4.481 Remedial and Emergency 40D-4.121 Notice and Hearing Measures Requirements 40D-4.011 Policy and Purpose. District has adopted the rules in (1) It is the policy of the this chapter and Chapter 40D-40 to District to regulate and control the ensure continued protection of the management and storage of all surface water resources of the District waters within its boundaries pursuant including wetlands and other natural to the provisions of Chapter 373, resources. Florida Statutes, and Chapters 17-40 (3) Additional rules relating to and 40D. However, the District surface water management are found recognizes the limits on its licens- in Chapter 40D-40 (General Surface ing resources. Therefore, it is the Water Management Permits). intent of the District to focus its (4) The Department of Environ- efforts on new surface water manage- mental Regulation (DER) delegated to ment systems and alterations to the District the authority to existing surface water management regulate storm water run-off. To systems which have, or probably will simplify the permitting process, the have, a significant impact on the District combined the regulation of water resources of the District, surface and storm water in these including wetlands and other natural rules. Therefore, the rules con- resources. tained in this chapter, Chapter 40D- (2) The rules in this chapter 40, and the District's "Basis of implement the comprehensive surface Review for Surface Water Management water management permit system Permit Applications within the . contemplated in part IV of Chapter Southwest Florida Water Management 373, Florida Statutes. As a result District" (Basis of Review) also of the passage of Chapter 84-79, Laws address storm water regulation of Florida, the Warren S. Henderson pursuant to Chapter 403, Florida Wetlands Protection Act of 1984, the Statutes, and Chapter 17-25. The A-6 MARCH 1988 MANAGEMENT AND STORAGE OF SURFACE WATERS CHAPTER 4 District's Basis of Review includes collected, controlled, conveyed, storm water system design criteria, impounded, or obstructed. The term as well as additional technical and includes dams, impoundments, administrative information for reservoirs, appurtenant works and applicants for permits. works as defined in subsections 373.403(l)-(5), Florida Statutes. Specific Authority 373.044, 373.113, (6) "New surface water manage- 373.149, 373.171, FS. Law ment system" means any surface water Implemented 373.413, 373.416, management system which is not in 373.426, FS. History - Readopted 10- existence on October 1, 1984, or not 5-74. Amended 10-1-84 and 3-1-88. authorized to be constructed on Previously numbered 16J-4.01. October 1, 1984. (7) "Alteration" means any 40D-4.021 Definitions. activity resulting in substantial When used in this chapter: expansion or change of a surface (1) "Surface water management water management system that will permit" means a letter of conceptual increase or decrease the design approval, construction permit or discharge of the system, increase operation permit. pollutant loading, change the point (2) "Letter of conceptual or points of discharge, or intrude approval" or "conceptual approval" into or otherwise adversely impact means a surface water management wetlands by rim-ditching, draining, permit issued by the District filling or excavation. Routine approving the concepts of a master custodial maintenance and repairs plan for a surface water management shall not constitute alterations. system which is binding upon the (8) "Surface waters of the District and the permittee based upon state" means those surface waters the rules in effect at the time of regulated pursuant to subsection filing of the conceptual application 403.031(12), Florida Statutes. and constitutes final District action (9) "Surface waters" are defined so that construction and operation in subsection 373.019(10), Florida permits for each phase will be Statutes. reviewed under the permitting (10) "Wetlands" means those criteria in effect when the applica- areas that are inundated by surface tion for conceptual approval was or ground water with a frequency filed. sufficient to support, and under (3) "Construction permit" means a normal circumstances do or would surface water management permit support, a prevalence of vegetative issued by the District authorizing or aquatic life that requires construction, al.1;eration or abandon- saturated or seasonally saturated ment of a surface water management soil condition for growth and system in accordance with the terms reproduction, such as swamps, and conditions of the permit. marshes, bayheads, cypress ponds, (4) "Operation permit" means a sloughs, wet prairies, wet meadows, surface water management permit river overflows, mud flats and issued by the District authorizing natural ponds. the operation and maintenance of a (11) "Total land area" means surface water management system in land holdings under common ownership accordance with the terms and or control which are contiguous, or conditions of the permit. land holdings which are served by a (5) "Surface water management common surface water management system" means the collection of system. facilities, improvements, or natural (12) "Construction" means any on systems whereby surface waters are site activity which will result in A-7 MARCH 1988 MANAGEMENT AND STORAGE OF SURFACE WATERS CHAPTER 4 the creation of a new surface water 9-4-77, 10-16-78, 10-1-84 and 3-1- management system, or the abandonment 88. Previously numbered 16J-4.03. or alteration of an existing surface water management system, including 40D-4.041 Permits Required. the building, assembling, expansion (1) Unless expressly exempt by or recontouring of the property; the law or District rule a surface water erection of buildings or other management permit must be obtained structures, or any part thereof; or from the District prior to: land clearing. (a) The construction and (13) "Basis of Review for Surface operation of any new surface water Water Management Permit Applications management system, or within the Southwest Florida Water (b) The alteration or Management District," or "Basis of abandonment of any surface water Review" is the document incorporated management system. by reference in Rule 40D-4.091, which (2) The District issues three provides threshold design, types of surface water management administrative and technical criteria permits: letters of conceptual for permit applicants. approval, construction permits and operation permits. Construction and Specific Authority 373.044, 373.113, operation permits may be issued in 373.149, 373.171, FS. Law Imple- three forms: individual permits, mented 373.403, 373.423, FS. History general permits, and noticed general - Readopted 10-5-74. Amended 10-1-84 permits. and 3-1-88. Previously numbered 16J- (a) A letter of conceptual 4.02. approval may be issued for projects that are to be developed in phases. 40D-4.031 Implementation, A letter of conceptual approval does Effective Date and Applicability. not authorize any construction. (1) Chapter 40D-4 shall continue (b) An individual construc- in implementation from January 1, tion or operation permit may be 1975, throughout the entire area issued for projects that do not comprising the District as of 11:59 qualify for general permits under p.m., December 31, 1976; and from Chapter 40D-40. An individual August 3, 1977, throughout the areas permit may authorize construction, annexed into the Peace and Withla- alteration, abandonment, operation coochee River Basins and within the and maintenance of a surface water Manasota Basin; and shall be imple- management system. mented October 16, 1978, and apply (c) A general construction within the area annexed into the or operation permit may be issued District by Chapter 78-65, Laws of for surface water management systems Florida. which satisfy thresholds and (2) Amendments to these rules conditions contained in Chapter adopted October 27, 1987, including 40D-40. A general permit may the Basis of Review, are effective authorize construction, alteration, March 1, 1988, and apply to permit abandonment, operation and main- applications filed on or after tenance of a surface water manage- March 1, 1988. ment system. (d) A noticed general con- Specific Authority 373.044, 373.113, struction or operation permit may be 373.149, 373.171, FS. Law Imple- issued for surface water management .mented, 373.413, 373.416, 373.426, systems which satisfy thresholds and FS., 76-243, Laws of Florida. conditions contained in Chapter 40D- History - Readopted 10-5-74, Amended 40. A noticed general permit may authorize construction, alteration, A-8 MARCH 1988 MANAGEMENT AND STORAGE OF SURFACE WATERS CHAPTER 4 abandonment, operation and main- (d) The activities will not tenance of a surface water management be conducted in existing lakes, system. A noticed general permit streams, or other watercourses; addresses compliance with state water (e) The surface water quality standards and criteria, management system will not utilize Chapter 17-3 and Rule 17-4.242, for drainage pumps or operable discharge storm water run-off. structures; (3) A permit may be required for (f) The activities will not surface water management systems utilize storm drainage facilities exempt under subsections 40D-4.051(3) larger than one 24-inch diameter or (6) if the master drainage plan is pipe, or its hydraulic equivalent; altered so as to have an adverse (g) Discharges from the site impact on the off site water will meet applicable state water resources in the District. quality standards, as set forth in (4) A noticed general permit is Chapter 17-3, and Rule 17-4.242; required for a surface water manage- (h) The activities are part ment system, otherwise exempt from of a conservation plan prepared or permitting under subsections 40D- approved by a local Soil and Water 4.051(4), (6), (7) or (8), unless the Conservation District Board system is exempt by statute or rule organized pursuant to Chapter 582, from storm water quality regulation Florida Statutes, (S.C.S.). If the or has received storm water quality S.C.S. conservation plan is not review and approval by the District implemented according to its terms, or by a DER permit, license or the exemption created in this certification. subsection does not apply. (i) The activities can Specific Authority 373.044, 373.113, otherwise reasonably be expected not 373.149, 373.171, FS. Law Imple- to have significant adverse water mented 373.413, 373.416, 373.426, resource impacts; and FS. History - Readopted 10-5-74, (j) The surface water Amended 12-31-74, 9-4-77, 6-7-78, 10- management system can be effectively 1-84, and 3-1-88. Previously maintained. numbered 16J-4.04, 16J- (3) Any project, work or 4.10(l),(2),(4). activity which has received all governmental approvals necessary to 40D-4.051 Exemptions. begin construction and is under The following activities are construction prior to October 1, exempt from permitting under this 1984. chapter: (4) Any project, work or (1) The acti-zities specified in activity which received a surface Sections 373.406, and 403.813, water management permit from the Florida Statutes. District prior to October 1, 1984. (2) The construction, alteration, (5) Any project, work or or operation of a surface water activity which did not require a management system for agricultural or surface water management permit from silvacultural activities which the District and had received all satisfies the following requirements: other necessary governmental ap- (a) The total land area does provals to begin construction or not equal or exceed 10 acres; operation prior to October 1, 1984. (b) The area of impervious (6) Any phased or long term surface will not equal or exceed 2 buildout project, including a acres; development of regional impact, (c) The activities will not planned unit development, develop- be conducted in wetlands; ment with a master plan or master A-9 MARCH 1988 MANAGEMENT AND STORAGE OF SURFACE WATERS CHAPTER 4 site plan, or similar project, which water or surface water by wells or has received local or regional pumps. Nevertheless, a Consumptive approval prior to October 1, 1984, Use Permit may be required for such if: withdrawals or diversions. (a) The approval process (c) The maintenance of requires a specific site plan and existing irrigation and drainage provides for a master drainage plan ditches, dikes and insect control approved prior to the issuance of a structures, provided that no more building permit, and dredging is to be performed than is (b) The developer has necessary to restore the dike or notified the District of its inten- irrigation or drainage ditch to its tion to rely upon this exemption on original design specifications. or before April 1, 1985. (9) Phosphate mining and mining Projects exempt under this related surface water management subsection shall continue to be systems are exempt from the require- subject to the District's surface ments of this chapter, provided that water management rules in effect all conditions for exemption in Rule prior to October 1, 1984. 40D-4.053(l) are met. However, (7) Mining, mining related nothing in this section is intended activities and mining reclamation, to exempt phosphate mining from the except for phosphate. Projects Department of Environmental Regula- exempt under this subsection shall tion's authority for permitting in continue to be subject to the dredge and fill jurisdictional District's surface water management areas. rules in effect prior to October 1, (10) Phosphate mine reclamation 1984. and restoration conducted in accor- (8) (a) All normal and necessary dance with Chapter 16C-16, the Mine farming and forestry operations as Reclamation rules of the Florida are customary for the area, which can Department of Natural Resources, is be conducted without the construction exempt from the requirements of this of a new surface water management chapter provided that all conditions system. Site preparation, clearing, for exemption in Rule 40D-4.053(2) fencing, contouring.to prevent soil are met. erosion, soil preparation, plowing, (11) Construction or private use planting, harvesting; and the of a single family dwelling unit, construction of access roads, and the duplex, triplex or quadruplex that placement of bridges and culverts to is not part of a larger common plan facilitate these operations do not of development or sale and does not constitute construction of a new involve wetlands regulated under surface water management system, Chapter 403, Florida Statutes, or provided such o@brations and facilit- isolated wetlands regulated under ies do not impede or divert the flow Chapter 373, Florida Statutes, and of surface waters entering or leaving these rules. the operation or intrude into or (12) The construction of otherwise substantially and adversely seawalls and docks which are regu- impact significant wetlands. lated by the DER when such construc- (b) The construction, opera- tion will not alter or is not part tion and maintenance of a farming or of an existing or proposed project forestry irrigation system, including requiring a District permit. headers, ditches, furrows and (13) Routine maintenance of a tailwater recovery ponds, which surface water management system; contain water only following a however, maintenance of surface rainfall event or resulting from water management systems will be withdrawals or diversions from ground considered in conjunction with the A-10 MARCH 1988 MANAGEMENT AND STORAGE OF SURFACE WATERS CHAPTER 4 applications for construction, project prior to issuance by the DER alteration, or operation. of its proposed agency action. (d) An existing permitted Specific Authority 373.044, 373.113, point of discharge shall not exceed 373.149, 373.171, FS. Law Imple- the volume and frequency designated mented 373.406, 373.413, FS. History by its DER discharge permit unless a - Readopted 10-5-74. Amended 10-1- lesser discharge is calculated in 84, 10-1-86 and 3-1-88. Previously accordance with Rule 40D-4.301(2) numbered 16J-4.05 and submitted to the District to be the maximum allowable discharge. 40D-4.052 Request for Exemption. (e) A new point of discharge (Reserved) shall be designed to the standards of Rule 40D-4.301(2) so that the 40D-4.053 Conditions for Exemp- volume and frequency of discharge tion. specified in its DER discharge (1) The exemption for phosphate permit is equivalent to maximum mining and related activities allowable discharge, which is not to provided in Rule 40D-4.051(9) is be exceeded. subject to the following conditions: (f) Natural drainage from (a) The operator shall off site upgradient areas shall not certify to the District prior to be interrupted so as to cause damage mining, with existing mines certify- to off site property or the public, ing by January 1, 1987, and provide and natural drainage patterns on sufficient information to demonstrate undisturbed lands shall be main- that all facilities are and will be tained to the maximum extent designed, constructed and operated to achievable without adversely avoid damage to off site property or altering the time, stage, volume and the public caused by: point or manner of discharge or 1. floodplain develop- dispersion. ment, encroachment or other altera- (2) The exemption for phosphate tion, mine reclamation and restoration 2. retardance, ac- provided in Rule 40D-4.051(10) is celeration or diversion of flowing subject to the following conditions: water, (a) The operator shall 3. reduction of natural certify to the District, beginning water storage areas, with the first annual or biannual 4. excessive discharge Department of Natural Resources or facility failure, or (DNR) reclamation plan required to 5. other activities be filed after January 1, 1987, and adversely impacting off site water provide sufficient information to flows or levels.- demonstrate that each reclamation (b) The operator shall submit and restoration program is designed, to the District a copy of each Annual and will be constructed and operated Report submitted to the Department of to avoid damage to off site property Natural Resources (DNR) in accordance or the public caused by: with Rule 16C-16.091. 1. floodplain develop- (c) The operator shall submit ment, encroachment or other altera- to the District a copy of each appli- tion, cation to the DER for a dredge and 2. retardance, fill permit concurrent with its acceleration or diversion of flowing submittal to DER, and fulfill the water, requirements of Rule 40D-4.053(l)(a) 3. reduction of natural specific to the dredge and fill water storage areas, A-11 MARCH 1988 MMAGEMENT AND STORAGE OF SURFACE WATERS CHAPTER 4 4. excessive discharge FS. Law Implemented 120.54(8), or facility failure, or 373.403, 373.413, 373.414, 373.416, 5. other actions 373.429, FS. History - New 4-2-87. adversely impacting off site water Amended 3-1-88. flows or levels. (b) The operator shall submit 40D-4.101 Content of Applica- to the District a copy of its tion. approved or pending Conceptual (1) Applications for permits Reclamation Plans or any amendments required by this chapter shall be thereto, under Rule 16C-16.041. filed with the District. The (c) The operator shall submit applicant shall submit: to the District a copy of its annual (a) The form entitled "Ap- or biannual application to the DNR plication to the Southwest Florida for approval of a reclamation and Water Management District" for a restoration program required by Rule surface water management permit; 16C-16.032, and fulfill the require- (b) The information required ments of Rule 40D-4.053(2)(a) in subsection 373.413(2), Florida specific to the program under Statutes; consideration prior to issuance by (c) Drawings, calculations the DUR of its proposed agency and engineering details sufficient action. to define the nature, scope, intent and functioning of the work Specific Authority 373.044, 373.113, proposed; 373.149, 373.171, FS. Law Imple- (d) The information required mented 373.406, 373.413, FS. in Rule 40D-4.101(2) below. History - New 10-1-86. (2) The following information may be required in support of the 40D-4.054 Alteration of Exempt application. The applicant should Projects. submit as much of the information A permit may be required for listed as the complexity of the alteration of a previously exempt project and the sensitivity of the surface water management system. area necessitates. A preapplication conference may be requested by the Specific Authority 373.044, 373.113, applicant at which time the staff FS. Law Implemented 373.406, shall identify which of the follow- 373.413, FS. History - New 10-1-84. ing information should be submitted and the level of detail required 40D-4.091 Publications Incor- with respect to the specific project porated by Reference. reviewed. The following document is hereby (a) Site Information includ- published by rZference and incor- ing: porated into this chapter. 1. Detailed location (1) "Basis of Review for Surface sketch. Water Management Permit Applications 2. Topographic map of within the Southwest Florida Water the site and adjacent hydrologically Management District, October 27, related areas, which shall include 1987." location and description of bench (2) The document listed in Rule marks (minimum of one per major 40D-4.091(l) is published by the water control structure). District and available from the 3. Overall map of the District upon request. area showing existing runoff patterns and size, location, Specific Authority 120.54(8), topography, and land use of off site 373.044, 373.113, 373,171, 373.414, A-12 MARCH 1988 MANAGEMENT AND STORAGE OF SURFACE WATERS CHAPTER areas which drain through, on to, and 4. Locations of roads from the project. and buildings along with their 4. Identification of wet proposed elevations. season high water table elevations. 5. Right of way and 5. If the project is in easement locations for the drainage the known floodway of a stream, or system including all areas to be other watercourse, the floodway reserved for water management should be identified and approximate purposes. flooding elevations determined. The 6. Location and size of 100 year flood plain elevations and internal minor water management limits should be identified, if facilities. applicable. 7. Nearby existing off 6. Description of site water resource facilities which vegetative cover, wetland areas in might be affected by the proposed and adjacent to the project area, and construction or development. The limits of waters of the state, if names and addresses of the owners of activities are proposed for these such facilities should also be areas. submitted. 7. Recent aerial (c) Drainage Calculations photography of a scale no smaller including: than 111 equals 800', encompassing the 1. Design storms used project area with project boundaries including depth, duration and delineated. distribution. 8. The construction 2. Off site inflows. drawings for the paving, grading, and 3. Stage-storage drainage with special attention to computations for the project and perimeter site grading. stage-discharge computations for the 9. Percolation tests, if outfall structure(s). percolation or exfiltration systems 4. Acreages and per- are proposed. Percolation tests centage of property proposed as: shall be representative of design a. Impervious conditions. surfaces (excluding water bodies), 10. Complete description b. Pervious of measures to be implemented during surfaces (green areas), the construction period to mitigate C. Lakes, canals, adverse quantity and quality impacts retention areas, etc., and off site. d. Total acreage of (b) Master Drainage Plan project. showing: 5. Runoff calculations 1. Location of all water showing discharges, elevations, and bodies with deta'lls of size, side volumes retained and/or detained slopes, elevations and depths. during applicable storm events. 2. Location and details Mathematical computations may be of all major water control struc- required to demonstrate that the tures. Control elevations of the proposed development will not control structures must be included significantly alter net storage from along with any seasonal water level the project area for events up to regulation schedules. the 100 year frequency. 3. Drainage basin boun- 6. Calculations daries showing direction of flow, required for determination of taking into account off site runoff minimum building flood and road being routed through or around the elevations. project. (d) Legal and Institutional Information including: A-13 KARCH 1988 MANAGEM ENT AND STORAGE OF SURFACE WATERS CHAPTER 4 1. Identification of the required in subsections 40D-4.101(l) entity responsible for operation and and (2). However, for conceptual maintenance of the surface water approval, items (a)8, (a)10, (b)5 management system. and (b)6 of Rule 40D-4.101(2) will 2. A letter or other not be necessary. evidence of potential acceptance from (4) (a) If the applicant the public body, if the operation and desires to dispute the necessity for maintenance entity is to be a public any information requested on an body such as a city or drainage application form or at a pre- district. Documents verifying the application conference, he may do so existence of such an organization and at a regularly scheduled meeting of its ability to accept operation and the Governing Board. maintenance responsibility, if the (b) An applicant should entity is a homeowners association. submit a written request to present 3. Indication of how evidence regarding such dispute at water and wastewater service will be least 21 days prior to the Governing supplied. Letters of commitment from Board meeting at which he plans to off site suppliers must be included. present the evidence. 4. Identification of (c) Upon hearing such agencies and organizations contacted evidence, the Governing Board will in connection with the project. determine whether the information in Include meeting summaries and/or dispute is required. responses. Give status of local approvals indicating if site plan Specific Authority 373.044, 373.113, and/or subdivision approval has been 373.149, 373.171, FS. Law Imple- granted, final plats recorded and mented 373.042, 373.413, FS. building or construction permits History - Readopted 10-5-74, Amended issued. 12-31-74, 6-7-78, 10-1-84 and 3-1- 5. Present and proposed 88. Previously numbered 16J- zoning: Evidence of current density 4.06(l), (2). and classification under local government zoning or comprehensive 40D-4.111 Notice of Application plan must be submitted; include the Form. status under the DRI process, if applicable. The number of proposed Specific Authority 373.044, 373.133, dwelling units and/or square feet of 373.149, 373.171, FS. Law Imple- commercial area must be supplied. If mented 373.413, 373.416, 373.426, the project is an approved DRI, then FS. History - Readopted 10-5-74, a copy of the final approved develop- Amended 10-24-76. Previously ment order must be supplied. numbered 16J-4.071. Repealed 10-1- 6- A copy of a boundary 84. survey and evidence of ownership or control; if the Applicant is a 40D-4.121 Notice and Hearing contractual buyer then a copy of the Requirements. executed contract must be provided. 7. Documentation of Specific Authority 373.044, 373.113, legal and physical availability of 373.149, 373.171, FS. Law Imple- receiving water system to receive mented 373.413, 373.416, 373.426, project discharge if such is not FS. History - Readopted 10-5-74. evident. Amended 10-21-80. Previously (3) The application must be numbered 16J-4.072, 16J-4.074. signed by the owner or his authorized Repealed 10-1-84. agent, and submitted to the District with four copies of all information A-14 MARCH 1988 MANAGEMENT AND STORAGE OF SURFACE WATERS CHAPTER 4 40D-4.131 Times for Receiving impacts to wetlands, fish and Objections and for Hearing. wildlife, or other natural resour- ces, Specific Authority 373.044, 373.133, (g) can be effectively 373.149, 373.171, FS. Law Imple- operated and maintained, mented 373.413, 373.416, 373.426, (h) will not adversely FS. History - Readopted 10-5-74. affect public health and safety, Amended 10-21-80. Previously (i) is consistent with the numbered 16J-4.073. Repealed 10-1- requirements of other public 84. agencies, (j) will not otherwise be 40D-4.201 Permit Processing Fee. harmful to.the water resources A permit processing fee shall be within the District, paid to the District at the time a (k) will not interfere with permit application is filed in the the legal rights of others as amount prescribed in the schedule set defined in Rule 17-40.07, and forth in Rule 40D-0.201. (1) is not against public policy. Specific Authority 373.044, 373.133, (2) The standards and criteria 373.149, 373.171t FS. Law Imple- contained in the Basis of Review mented 373.109, FS. History - adopted by reference in Rule 40D- Readopted 10-5-74. Previously 4.091(l) apply to the design and numbered 16J-4.061. performance of surface water manage- ment systems to provide the 40D-4.301 Conditions for reasonable assurances required in Issuance of Permits. Rule 40D-4.301(l). Other methods of (1) In order to obtain an meeting overall objectives may be individual construction and operation proposed and may be considered in permit under this chapter, an determining whether the applicant applicant must give reasonable has provided the reasonable assurances that the surface water assurances required by Rule 40D- management system: 4.301(l). (a) provides adequate flood protection and drainage, Specific Authority 373.044, 373.113, (b) will not cause adverse 373.149, 373.171, FS. Law Imple- water quality and quantity impacts on mented 373.042, 373.403, 373.413, receiving waters and adjacent lands 373.414, 373.416, 373.426t FS. regulated pursuant to Chapter 373, History - Readopted 10-5-74, Amended Florida Statutes, 12-31-74, 6-7-78, 10-1-84, 6-2-85, (c) will not cause discharges and 3-1-88. Previously numbered 16J- which result in -any-violation, in 4.06(3), (4), (5), (6), (8). surface waters of the state, of the applicable standards and criteria of 40D-4.321 Duration of Permits. Chapter 17-3, and Rule 17-4.242, (1) Unless revoked, extended or (d) will not cause adverse otherwise modified, the duration of impacts on surface and groundwater a surface water management permit levels and flows, issued pursuant to this chapter is: (e) will not diminish.the (a) two years from the date capability of a lake or other of issuance, for a letter of concep- impoundment to fluctuate through the tual approval unless within that full range established for it in period an application for a con- Chapter 40D-8. struction permit is filed for any (f) will not cause adverse portion of the project. If the environmental impacts, or adverse application for a construction A-15 MARCH 1988 MANAGEMENT AND STORAGE OF SURFACE WATERS CHAPTER 4 permit is approved and construction extend a letter of conceptual is commenced, then the letter of approval may be made and reviewed: conceptual approval is valid so long (a) for an alteration of the as the conceptually permitted phases design of the surface water manage- are under construction consistent ment system, in accordance with the with a plan of development submitted same criteria as new applications to and approved by the District. if pursuant to Rules 40D-4.101 and 40D- construction of the permitted phases 4.301; is inconsistent with the plan of (b) for a project phase, in development then the conceptual accordance with Chapter 40D-40 if approval shall expire. the project phase satisfies the (b) three years from the date requirements of Rules 40D-40.112 and of issuance for a construction permit 40D-40.302; or unless the construction of the (c) for a project phase permitted surface water management which does not satisfy the require- system discharge structure has been ments of paragraph (b), in the completed. If the permitted dis- manner and using the criteria ap- charge structure has been completed, plicable to the conceptual then the construction permit is valid approval. for the duration of the project. (2) Applications to modify or (c) perpetual from the date extend construction or operation of issuance for an operation permit permits may be made: issued under Chapter 373, Florida (a) by formal application Statutes. and reviewed using the same criteria (2) Letters of conceptual as new applications, pursuant to approval and construction permits Rules 40D-4.101 and 40D-4.301, or expire automatically unless the (b) by letter, provided the permittee requests an extension no requested modification or extension more than 180 days prior to the does not: expiration date. 1. substantially alter (3) An extension may be granted the permit authorization, if the permit is consistent with the 2. increase the District's rules in effect at the authorized off site discharge, time the request for extension is 3. impact the environ- filed. Extensions may be granted for mental features of the project, up to two years for letters of 4. decrease the conceptual approval and up to three required retention/detention, years for construction permits. 5. decrease the required flood control elevations Specific Authority 373.044, 373.113, for roads or buildings, or FS. Law Implemented 373.413, 6. decrease pollution 373.416, FS. History - New 10-1-84. removal efficiency. Amended 3-1-88. Specific Authority 373.044, 373.113, 40D-4.331 Modification and 373.149, 373.171, FS. Law Imple- Extension of Permits. mented 373.413, 373.416(l), 373.429, An application for modification FS. History - Readopted 10-5-74. or extension of a surface water Amended 10-1-84 and 3-1-88. management permit shall be processed Previously numbered 16J-4.13. in accordance with this rule, unless the permit is revoked, suspended or 40D-4.341 Revocation of expired. Permits. (1) Applications to modify or (1) The Board may revoke a permit at any time if it determines A-16 MARCH 1988 MANAGEMENT AND STORAGE OF SURFACE WATERS CHAPTER 4 that a dam, impoundment, appurtenant permitted operation will be consis- work, or works has become a danger to tent with the overall objectives of the public health or safety or if its the District and will not be harmful operation has become inconsistent to the water resources of the with the objectives of the District District. or is in violation of any rule or (2) In addition to project order of the District, or the specific special conditions, the conditions of the permit. following standard limiting condi- (2) Revocation proceedings shall tions shall be attached to all be conducted in accordance with the permits issued pursuant to this provisions of Section 373.429, chapter unless waived or modified by Florida Statutes, and Chapter 40D-1. the Board. (a) The permittee shall Specific Authority 373.044, 373.113, perform the construction authorized 373.149, 373.171, FS. Law Imple- in a manner so as to minimize any mented 373.429, FS. History - adverse impact of the system on Readopted 10-5-74. Amended 10-1- fish, wildlife, natural environmen- 84. Previously numbered 16J-4.13. tal values, and water quality. The permittee shall institute necessary 40D-4.351 Transfer of Permits. measures during the construction (1) A permittee must notify the period, including full compaction of District within 30 days of the sale any fill material placed around or conveyance of a surface water newly installed structures, to management system or the land on reduce erosion, turbidity, nutrient which the system is located. The loading and sedimentation in the District will transfer the surface receiving waters. water management operation and (b) Water quality data for maintenance permit provided the land the water discharged from the use remains the same. A surface permittee's property or into surface water management permit to construct waters of the state shall be sub- or alter a system will not be mitted to the District as required. transferred if the permit is over Parameters to be monitored may three years old and the permitted include those listed in Chapter 17- project discharge structure or 3. Analyses shall be performed equivalent has not been constructed. according to procedures outlined in (2) After the completion of the current edition of Standard construction of the surface water Methods for the Examination of Water management system and approval of the and Wa--tewater by American Public facilities by the District, the Health Association or Methods for District will transfer the opera- Chemical Analyses of Water and tional phase of the permit to the Wastes by the U. S. Environmental accepted responsible operational Protection Agency. If water quality entity. data are required, the permittee shall provide data as required on Specific Authority 373.044, 373.113, volumes of water discharged, includ- FS. Law Implemented 373.413, ing total volume discharged during 373.416(2), FS. History - New 10-1- the days of sampling and total 84. monthly discharges from the property or into surface waters of the state. 40D-4.381 Limiting Conditions. (c) The permittee shall (1) The Board may impose on any comply with all applicable local permit granted under this chapter subdivision regulations and other such reasonable conditions as are local requirements. In addition the necessary to assure that the permittee shall obtain all necessary A-17 MARCH 1988 MANAGEMENT AND STORAGE OF SURFACE WATERS CHAPTER 4 Federal, State, local and special District will issue an authorization district authorizations prior to the to commence construction. start of any construction or altera- (i) The permit does not tion of works authorized by this convey to the permittee any property permit. right nor any rights or privileges (d) The operation phase of other than those specified in the this permit shall not become effec- permit and Chapter 40D-4. tive until the owner or his authori- (j) The permittee shall hold zed agent certifies that all facili- and save the District harmless from ties have been constructed in any and all damages, claims, or accordance with the design permitted liabilities which may arise by by the District. Within 30 days reason of the construction, opera- after completion of construction of tion, maintenance or use of any the surface water management system, facility authorized by the permit. the permittee shall submit the (k) This permit is issued certification and notify the District based on the applicant's submitted that the facilities are complete. information which reasonably demon- Upon completion of the surface water strates that adverse off site water management system, the permittee resource related impacts will not be shall request transfer of the permit caused by the completed permit to the responsible entity approved by activity. It is also the respon- the District. The District may sibility of the permittee to insure inspect the system and require that adverse off site water resource remedial measures as a condition of related impacts do not occur during transfer of the permit. construction. (e) All roads shall be set at (1) Prior to dewatering, or above elevations required by the plans shall be submitted to the applicable local government flood District for approval. Information criteria. shall include as a minimum pump (f) All building floors shall sizes, locations and hours of be set at or above elevations operation for each pump. If off acceptable to the applicable local site discharge is proposed, or off government. site adverse impacts are evident, an (g) Off site discharges individual water use permit may be during construction and development required. The permittee is shall be made only through the cautioned that several months may be facilities authorized by this required for consideration of the permit. Water discharged from the water use permit application. project shall be through structures Temporary dewatering during con- having a mechanism suitable for struction, i.e., well pointing, regulating upstream stages. Stages ditching, etc., that will not affect may be subject to operating schedules adjacent wetlands or off site lands satisfactory to the District. is exempt from this requirement. (h) No construction authori- zed herein shall commence until a Specific Authority 373.044, responsible entity acceptable to the 373.113, 373.149, 373.171, FS. Law District has been established and has Implemented 373.042, 373.403, agreed to operate and maintain the 373.409, 373.413, 373.416, 373.426, system. The entity must be provided FS. History - Readopted 10-5-74, with sufficient ownership so that it Amended 12-31-74, 6-7-78, 10-1-84 has control over all water management and 3-1-88. Previously numbered facilities authorized herein. Upon 16J-4.06(7), 16J-4.11, 16J-4.10(3). receipt of written evidence of the satisfaction of this condition, the A-18 MARCH 1988 MANAGEMENT AND STORAGE OF SURFACE WATERS CHAPTER 40D-4.401 Identification Tags. 40D-4.461 Inspection. Inspection of permitted systems Specific Authority 373.044, 373.133, shall be conducted in accordance 373.149, 373.171, FS. Law Imple- with Section 373.423, Florida mented 373.413, 373.416, 373.426, Statutes. FS. History - Readopted 10-5-74. Previously numbered 16J-4.062. Specific Authority 373.044, 373.133, Repealed 10-1-84. 373.149, 373.171, FS. Law Imple- mented 373.423, FS. History - 40D-4.411 Completion Report. Readopted 10-5-74. Amended 10-1- 84. Previously numbered 16J-4.09. Specific Authority 373.044, 373.113, 373.149, 373.171, FS. Law Imple- 40D-4.471 Abatement. mented 373.419, FS. History - Abatement proceedings shall be Readopted 10-5-74. Previously conducted in accordance with Section numbered 16J-4.08. Repealed 10-1- 373.433, Florida Statutes. 84. Specific Authority 373.044, 373.113, 40D-4.451 Emergency Authoriza- 373.149, 373.171, FS. Law Imple- tion. mented 373.433, FS. History - (1) Permission to begin con- Readopted 10-5-74. Amended 10-1- struction of works prior to the 84. Previously numbered 16J-4.14. issuance of a permit may be applied for, in writing, when the emergency 40D-4.481 Remedial and conditions justify. Ho*ever, no such Emergency Measures. permission shall be granted unless (1) Remedial measures shall be the construction of the works is processed in accordance with the already under consideration for a provisions of Section 373.436, permit under Rule 40D-4.041. A Florida Statutes. serious set of unforeseen or (2) Emergency measures shall be unforeseeable circumstances must employed in accordance with the exist to create an emergency. Mere provisions of Section 373.439, carelessness or lack of planning on Florida Statutes. the part of the applicant shall not be sufficient grounds to warrant the Specific Authority 373.044, 373.113, granting of emergency authorization. 373.149, 373.171, FS. Law Imple- (2) The Executive Director may mented 373.436, 373.439, FS. grant emergency authorization at his History - Readopted 10-5-74. discretion. The emergency authori- Amended 10-1-84. Previously zation shall be-presented to the numbered 16J-4.15, 16J-4.17. Board for concurrence at its next meeting. The failure to receive the Board's concurrence shall invalidate the emergency authorization. Specific Authority 373.044, 373.113, 373.149, 373.171, FS. Law Imple- mented 373.413, FS. History - Readopted 10-5-74, Amended 10-24-76, 10-1-84. Previously numbered 16J- 4.16. A-19 Chapter 40D-40 This rule sets forth the requirements for general surface water management permits. The applicable, specific design criteria set forth in Part B of this manual must still be met but the processing time for permits will be shorter than under Chapter 40D-4. Noticed general permits provide a means to address storm water run-off for projects under 10 acres that do not include wetlands and otherwise qualify for these permits. Projects are not reviewed for their water quantity discharge impacts. General permits are issued for projects 10 to 40 acres in size that meet the rule requirements. Both the water quantity and water quality aspects of the project must be addressed in the design. The following types of projects/systems may qualify for a general permit under this rule: 1. All works within the District which serve projects with less than 40 acres total land area, which are located on uplands, and which are within local entities that have adopted subdivision regulations, are permitted by this rule subject to conditions. 2. All works within the District which serve public highway projects constructed or funded by state, federal or local government, are permitted by this rule subject to conditions and exceptions. The exceptions specified in the rule apply to projects which are likely to have an impact on the water resources of the District. 3. An individual phase of a project which is less than 40 acres in size and is in conformance with a Conceptual Approval which has been issued. The Application Form; the name and address of the proposed operation entity; and the construction drawings for the paving, grading and drainage with supporting calculations and other appropriate documents must be submitted to be permitted under this rule. A-20 MARCH 1988 GENERAL SURFACE WATER MANAGEM ENT PE RMI TS CHAPTER 40 RULES OF THE SOUTHWEST FLORIDA WATER MANAGEMENT DISTRICT CHAPTER 40D-40 GENERAL SURFACE WATER MANAGEMENT PE M TS 40D-40.011 Policy and Purpose 40D-40.141 Request for Additional 40D-40.031 Implementation, Effective Information Date and Applicability 40D-40.301 Conditions for Issuance 40D-40.041 Noticed General Permit for of Noticed General Construction, Alteration Permits or Operation of Surface 40D-40.302 Conditions for Issuance Water Management Systems of General Permits 40D-40.042 General Permit for 40D-40.321 Duration of Permits Construction, Alteration 40D-40.331 Modification of Permits or Operation of Surface 40D-40.341 Revocation of Permits Water Management Systems 40D-40.351 Transfer of Permits 40D-40.111 Requests for Noticed General 40D-40.381 Limiting Conditions Permits 40D-40.112 Content of Application for General Permits 40D-40.011 Policy and Purpose. Specific Authority 373.044, 373.113, The rules in this chapter grant 373.118, FS. Law Implemented general permits for certain specified 373.103(l), 373.413(l), 373.416, surface water management systems 373.419, 373.429, FS. History - New which have been determined to be not 10-1-84. Amended 3-1-88. harmful to the water resources of the District and consistent with the 40D-40.021 Definitions. objectives of the District. The As used in this chapter: purpose of this chapter is to set (1) "Public highway project" forth the requirements for qualifying means a road and associated for a noticed general permit or a facilities located within a right of general permit and the conditions way dedicated to the public for under which they may be exercised. highway purposes, which are Non-exempt surface water management constructed, altered, operated, systems not qualifying for a noticed maintained or funded by the United general permit or a general permit States, the State of Florida, a under this chapter are required to county, or municipality. obtain individual permits. The (2) The terms have the same District reserves the right to meaning as defined in Rule 40D- require an individual permit for any 4.021. surface water management system which does not comply with the provisions Specific Authority 373.044, 373.113, of this chapter or which is harmful 373.118, FS. Law Implemented to the water resources of the 373.413, 373.416, 373.419, District, interferes with the legal 403.031(3), FS. History - New 10-1- rights of others, is inconsistent 84. Amended 3-1-88. with the overall objectives of the District, or is otherwise contrary to 40D-40.031 Implementation, the public interest. Effective Date and Applicability. (1) This rule specifies the effective dates for the general A-21 MARCH 1988 GENERAL SURFACE WATER MANAGEMENT PERMITS CHAPTER 40 surface water management permits (1) All persons constructing, granted in this chapter. altering, operating or maintaining a (2) If the surface water manage- surface water management system who ment system meets the conditions of meet the conditions specified in subsections 40D-40.302(l) through Rule 40D-40.302, are authorized to (4), the effective date is October 1, construct, alter, operate or 1984. maintain the surface water manage- (3) Amendments to these rules ment system subject to the require- adopted October 27, 1987, including ments of this chapter. the Basis of Review, are effective (2) All persons constructing, March 1, 1988, and apply to permit altering, operating or maintaining applications filed on or after March surface water management systems 1, 1988. which are discrete and independent phases of a project which has Specific Authority 373.044, 373.113, received conceptual approval, and 373.118, FS. Law Implemented which meet the criteria of the 373.416, 373.419, FS. History - New conceptual approval and otherwise 10-1-84. Amended 3-1-88. satisfy the requirements of Rule 40D-40.302, are authorized to 40D-40.041 Noticed General construct, alter, operate or Permit for Construction, Alteration maintain the surface water manage- or Operation of Surface Water ment system subject to the require- Management Systems. ments of the conceptual approval and (1) All persons constructing, this chapter. altering, operating or maintaining a (3) No construction, alteration, surface water management system who operation or maintenance shall be meet the conditions of Rule 40D- commenced until the permittee 40.301, are authorized to construct, receives a written authorization to alter, operate or maintain a surface proceed from the District. water management system subject to (4) The District shall act on the requirements of this chapter. the application within 60 days from These permits require compliance with the receipt of a complete applica- state water quality standards and tion and all requested additional criteria, Chapter 17-3 and Rule 17- information. 4.242. (2) No construction, alteration, Specific Authority 373.044, 373.113, operation or maintenance shall be 373.118, FS. Law Implemented commenced until the permittee 120.60(2), 373.413, 373.414, receives a written authorization to 373.416, 373.419, FS. History - New proceed from the District. 10-1-84. Amended 3-1-88. (3) The District shall act on the application within 60 days from the 40D-40.111 Requests for Noticed receipt of a complete application and General Permits. all requested additional information. (1) Requests for noticed general permits shall be filed with the Specific Authority 373.044, 373.113, District. The request shall 373.118, FS. Law Implemented contain: 120.60(2), 373.413, 373.416, FS. (a) Form entitled "Request History - New 3-1-88. for Noticed General Permit Pursuant to Rule 40D-40.111, Surface Water 40D-40.042 General Permit for Management." Construction, Alteration or Operation (b) The construction of Surface Water Management Systems. drawings for the paving, drainage and grading of the area showing: A-22 MARCH 1988 CENERAL SURFACE WATER MANAGEMENT PERMITS CHAPTER 40 1. the total land area; (c) number of dwelling units 2. the total area of or square feet of commercial area, impervious surface; (d) evidence of present 3. the location of any and/or proposed zoning and on site wetlands; (e) proposed minimum road 4. the location and and flood elevations. details of the surface water manage- (3) a description of the surface ment system including but not limited water management system to be to any lakes, culverts, pipes, constructed or altered including: exfiltration trenches, discharge (a) acreage of impervious structures, pumps and related cover, and facilities; (b) acreage of water manage- 5. the surface water ment system; management system design plans and (4) a statement of facts which calculations, signed and sealed by a show why the proposed surface water Florida registered Professional management system qualifies for a Engineer, if required by Chapter 471, general permit; Florida Statutes. (5) a statement that all (c) A written statement of necessary Federal, State, local and ownership of the property which shall special district criteria have been include: met and that the project is 1. the legal descrip- acceptable to the pertinent local tion, and jurisdiction as being in the public 2. a statement that the interest; total contiguous property owned or (6) the date on which construc- controlled by the applicant does not tion or alteration is expected to exceed ten acres. This does not commence; apply to requests required by Rule (7) a copy of the paving, 40D-4.041(4). grading and drainage plans, (8) the name and address of the Specific Authority: 373.044, 373.113, proposed operational entity, and; 373.118, FS. Law Implemented (9) such other information as is 373.413, 373.416, 373.419, FS. reasonably necessary for the staff History - New 3-1-88. to determine that the surface water management system meets the condi- 40D-40.112 Content of Applica- tions of this chapter including any tion for Ceneral Permits. information required in Rule 40D- Prior to the commencement of any 4.101. construction or alteration of a surface water-management system Specific Authority 373.044, 373.113, authorized in Rule 40D-40.042, the 373.118, FS. Law Implemented applicant shall file with the 373.413, 373.414, 373.416, 373.419, District the form entitled "Applica- FS. History - New 10-1-84. Amended tion to the Southwest Florida Water 3-1-88. Management District." The Applica- tion shall include the following 40D-40.141 Request for information: Additional Information. (1) the applicant's name and (1) If the information provided address; is not sufficient to determine (2) a description of the proposed whether the construction, altera- project, including: tion, operation or maintenance of (a) location, the surface water management system (b) total acreage, qualifies for a noticed general permit under Rule 40D-40.301 or for A-23 MARCH 1988 GENERAL SURFACE WATER MANAGEMENT PERMITS CHAPTER 40 a general permit under Rule 40D- standards and criteria, as set forth 40.302, or meets the conditions in in Chapter 17-3 and Rule 17-4.242; Rule 40D-40.381, the District may (h) The proposed building request the permittee to submit floors will be above the 100 year additional information, including any flood elevation; information required in Rule 40D- (i) The activities can 4.101. otherwise be expected to have (2) If additional information is acceptable or insignificant water required, it shall be requested resources impacts; within 30 days of receipt of the (j) The surface water Application. management system can be effectively maintained; and Specific Authority 373.044, 373.113, (k) The surface water 373.118, FS. Law Implemented management system will meet the 120.60(2), 373.413, 373.414, 373.416, applicable water quality criteria in 373.419, FS. History - New 10-1-84. Section 3.2.2 of the Basis of Review Amended 3-1-88. described in Rule 40D-4.091(l). (2) Applicants required to 40D-40.301 Conditions for obtain a permit by subsection 40D- Issuance of Noticed General Permits. 4.041(4) may obtain a noticed (1) To obtain a noticed general general permit if the applicant permit, an applicant must provide provides reasonable assurance and reasonable assurance that the certifies that the conditions in following conditions are met and paragraphs 40D-40.301(l)(j) and (k) certify that: are met. (a) The total land area does (3) The FDOT may satisfy the not equal or exceed 10 acres; conditions in paragraphs 40D- (b) The area of impervious 40.301(l)(g) and (k) above for surface will not equal or exceed two projects which otherwise qualify for acres; noticed general permits by certify- (c) The activities will not ing that the DER and the Corps of be conducted in isolated wetlands Engineers have authorized the regulated under Chapter 373, Florida project. Statutes, and these rules, or in wetlands regulate d under Chapter 403, Specific Authority 373.044, 373.113, Florida Statutes-, 373.118, FS. Law Implemented (d) The activities will not 373.413, 373.414, 373.416, FS. be conducted in existing lakes, History - New 3-1-88. streams or other water courses; (e) T11e activities will not 40D-40.302 Conditions for utilize pumps for storm water Issuance of General Permits. management; In order to qualify for a (f) The activities will not general permit under this chapter, utilize storm drainage facilities the applicant must give reasonable larger than one 24-inch diameter assurances that the surface water pipe, or its equivalent. Exceptions management system meets all condi- to this are projects of the Florida tions of subsection 40D-40.302(l) Department of Transportation (FDOT) and all thresholds and conditions of that will not increase the size or at least one other subsection. hydraulic capacity of any existing (1) General Conditions. drainage facility. (a) The surface water (g) Discharges from the site management system must meet the will meet state water quality criteria specified in Rule 40D-4.301 and applicable local requirements. A-24 MARCH 1988 GENERAL SURFACE WATER MAMAGEMNT PERMITS CHAPTER 40 (b) The.permittee must have 40D-40.321 Duration of Permits. obtained a Works of the District Unless revoked or otherwise permit or other approval from the modified, the duration of a noticed District if the permittee proposes general permit authorized in Rule to connect to, place structures in or 40D-40.041 or a general permit across, or otherwise make use of authorized in Rule 40D-40.042 is: works owned by the District. (1) 3 years, for a construction (2) Thresholds and Additional permit unless the construction of Conditions. the permitted project discharge (a) The project must have structure or equivalent has been less than 40 acres total land area. completed. If the permitted (b) The project and surface discharge structure or equivalent water management system must have has been completed, then the been approved by the appropriate unit construction permit is valid for the of local government subsequent to the duration of the project construc- effective date of this rule. tion. (3) Additional Conditions for (2) perpetual, for an operation Surface Water Management Systems permit issued under Chapter 373, Associated with Public Highway Florida Statutes. Projects. (a) The public highway Specific Authority 373.044, 373.113, project must be located within a 373.118, FS. Law Implemented right of way dedicated to the public 373.413, 373.416, 373.419(2), FS. for highway purposes. History - New 10-1-84. Amended 3-1- (b) The public highway 88. project must not: 1. Drain lands outside 40D-40.331 Modification of the jurisdiction of the constructing Permits. or funding public body; A request for modification of a 2. Lower or have the noticed general permit or a general potential for lowering the dry season surface water management permit groundwater table outside the shall be made in accordance with project's design drainage area; and this rule, unless the permits are 3. Interfere with otherwise revoked, suspended or natural drainage patterns or flows. expired. Requests to modify (4) Additional Conditions for permits shall be made: Phased Construction under Conceptual (1) in accordance with Rules Approvals. 40D-40.041, 40D-40.111 and 40D- (a) The project phase must 40.301 for noticed general permits; comply with the-requirements of the or conceptual approval. (2) in accordance with Rules (b) The project phase must be 40D-40.042, 40D-40.112 and 40D- less than 40 acres and meet the 40.302 for general permits; or conditions of subsection 40D- (3) by letter provided the 40.302(l) and (2)(b). requested modification does not (c) The Conceptual Approval exceed the conditions of subsection must have been issued subsequent to 40D-4.331(2)(b). October 1, 1984. Specific Authority 373.044, 373.113, Specific Authority 373.044, 373.113, 373.118, FS. Law Implemented 373.118, FS. Law Implemented 373.413, 373.416(l), 373.429, FS. 373.413, 373.414, 373.416, 373.419, History - New 10-1-84. Amended 3-1- FS. History -New 10-1-84. Amended 88. 3-1-88. A-25 MARCH 1988 GENERAL SURFACE WATER MAKAGEMNT PERMITS CHAPTER 40 40D-40.341 Revocation of Permits. Violations of this chapter may result in the revocation or suspen- sion of the authorization in whole or part in accordance with the provisions of Section 373.429, and Chapter 120, Florida Statutes, and Chapter 40D-1. Specific Authority 373.044, 373.113, FS. Law Implemented 120.60(6), 373.429, FS. History - New 10-1-84. 40D-40.351 Transfer of Permits. Transfer of permits shall be made in accordance with Rule 40D-4.351. Specific Authority 373.044, 373.113, FS. Law Implemented 373.413, 373.416(2), FS. History - New 10-1- 84. 40D-40.381 Limiting Conditions. The noticed general and general permits authorized in this chapter shall be subject to the following limiting conditions: (1) The limiting conditions of Rule 40D-4.381 shall apply. (2) The noticed general and general permit shall be subject to other reasonable conditions as are necessary to assure that the per- mitted system will not be inconsis- tent with the overall objectives of the District and will not be harmful to the water resources of the District. Specific Authority 373.044, 373.113, 373.118, FS. Law Implemented 373.117, 373.413, 373.414, 373.416, 373.419, FS. History - New 10-1-84. Amended 3-1-88. A-26 SqUaMlTnbgH -la-4lPMUUO-4S A-4unOD L15TIO-TOqsTTTH ;0 UOTssTuu'DD UO-r-Pa-401d Tl2qUaUlUOJTAU2 Ic XiGmaddv Prior to Construction Plan approval, the following must be shown on the plan or data must be submitted for review: 1. All items as required for Preliminary Plat approval. 2. For every one of the wetlands or the conservation /preservation areas'.affected by the proposed development, calculate the pre-and post-development runoff volume discharged into the wetland due to a 3 year-24 hour, and a one inch storm event. /Ofoe hoult 3. For every one of the wetlands or the conservation areas within the property, indicate the pre-development watershed area contributing surface runoff to the wetland or the conservation area; also indicate the type of ground coverage, the type of soil, and topographic contours of the proposed development site. 4. Normal water level, design low water, design high water and top of bank should be shown for all lakes, and detention or retention ponds. 5. If a body of water is used as a detention or retention pond, indicate the stages corresponding to the first 1/2" of runoff. 1 6. If a man-made lake or detention pond discharges into a conservation area, indicate the weir elevation of the weir through which water is discharged. Indicate elevations of control structures for water outflows from conservation areas, if such structures are being built. 7. Drainage calculations must be submitted to EPC. 8. Data and calculations for determining the maintenance of the natural hydroperiod of each wetland. This is needed in order to evaluate and ensure maintenance of wetland amenities. 9. Detailed mitigation plans which include cross-sections showing slopes, depth of excavation, desired water levels, types of plants to be used and spacing. Total acreage of wetlands destroyed and mitigated for. Time tables for starting and completing mitigation work. Monitoring schedule and reports and statement that 85% survival will be attained with replanting on an annual basis if necessary. A completed "Application for Mitigation Plan-Approval". Hillsborough County Land Alteration and Landscape Section approval sign-off for potential mitigation sites. 10. Method of erosion control to be u@ed (i.e. hay bales, screens, etc.) and their placement (i.e along 30' setback, conservation line, etc.). (To protect water quality and wetland habitat). 11. Mitigation sites labelled as Conservation or Preservation areas as per Ek wetland Rule Chapter 1-11. NOAA COASTAL SERVICES CTR LWRARY i . 3 6668 14111380 5