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FEB 18 ASSESSMENT OF GROUND-WATER MONITORING REQUIREMENTS ALONG THE NORTHWEST FLORIDA COAST COASTAL ZONE INFORMATION CENTER ""'" 'EST FLORIDA WATER MANAGEMENT DISTRICT GB 1001 . C546 Water Resources Special Report 86-1 1986 ~~January 1986 ASSESSMENT OF GROUND-WATER MONITORING REQUIREMENTS ALONG THE NORTHWEST FLORIDA COAST By Linda Ann Clemens NORTHWEST FLORIDA WATER MANAEMENT DISTRICT Water Resources Special Report 86-1 CSC U. S. DEPARTMENT OF COMMERCE NOAA COASTAL SERVICES CENTER 2234 SOUTH HOBSON AVENUE CHARLESTON, SC 29405-2413 -D r- .1 0 D o o January 1986 NORTHWEST FLORIDA WATER MANAGEMENT DISTRICT GOVERNING BOARD Davage Runnels, Chairman Destin William C. Smith, Vice Chairman Tallahassee Marion Tidwell, Sec. Treas. Chumuckla Tom S. Coldewey W. Fred Bond R. L. Price, Jr. Port St. Joe Pensacola Graceville Blucher Lines Candis M. Harbison Dr. Louis J. Atkins Quincy Panama City Blountstown J. William McCartney - Executive Director I~~~~~~~~~~~~~~ _== ___ , =========================== === For additional information, write or call: Northwest Florida Water Management District Route 1, Box 3100 Havana, Florida 32333 (904) 487-1770 ii TABLE OF CONTENTS P AGE 3 ~~INTRODUCTION ..1............................. Previous Work ............................14 I ~~WATER USE IN THE NORTHWEST FLORIDA WATER MANAGEMENT DISTRICT........9 Major Water Users...........................10 I ~~~~Current and Historic Cones of Depression ................1 Fort Walton Beach Area .....................11 Bay 'County ...........................12 Port St. Joe ..........................15 HYDROGEOLOGY................................17 Hydrostratigraphy...........................17 Aquifer Characteristics .......................21 WATER QUALITY ...............................31 Santa Rosa County Through Walton County................33 Bay County ..............................37 Gulf County to Jefferson County ....................42 I ~~COMPREHENSIVE MONITORING PLAN .......................51 Monitor Well Locations ........................52 I ~~~~~Jefferson County ........................52 Wakulla County .........................56 Franklin County.........................56 I ~~~~~Gulf County ..............I..............5 Bay County ...........................59 Walton County.60 I ~~~~~Okaloosa County.........................60 Santa Rosa and Escambia Counties ..................61 Monitor Well Construction Details...................61 I ~~~Water Quality Parameters .......................67 SUMMARY AND CONCLUSIONS ..........................71 REFERENCES.................................75 I ~~~~~~~~~~~~~~iii TABLE OF CONTENTS - (continued) PA GE APPENDICES.................................79 Appendix A. Selected Wells in the Coastal Areas of the Northwest District........................81I Appendix B. Major Water Users in the Coastal Areas of the Northwest District........................85 iv~~~~~~~ N ~~~~~~~~~~LIST OF FIGURES I ~FIGURE PAGE 1 ~~1. Location of Area of Investigation .................2 2. Location of Selected Wells.................... 7 I ~~3. Map Showing the Potentiometric Surface of the Upper Limestone of the Floridan Aquifer in July 1978............... 13 I 11~~. Vertical Zonation of Transmissivities in the Vicinity of Panama City Beach, Bay County.. .... ................. 25 3 ~~5. Vertical Zonation of Transmissivities in the Vicinity of Navarre Beach, Santa Rosa County... ................. 27 6. Chloride Cross Section, Navarre Beach, Santa Rosa County I ~~~~to Inlet Beach, Walton County ....................35 3 ~~7. Chlorides Cross Section, Bay County ................39 8. Chlorides Cross Section, Gulf and Franklin Counties.........43 3 ~~9. Chloride Concentrations in Franklin and Wakulla Counties......45 10. Proposed Monitor Well Locations ..................57 I~~~~~~~~~~~~~~ LIST OF TABLES TABLE PAGE 1. Average and Maximum Daily Use in the coastal areas of the Northwest District .......................10 2. Generalized Stratigraphic Column for the Coastal Areas of I ~~~~~Northwest Florida ........................19 3. Representative Estimated Transmissivities for the I ~~~~~Coastal Areas of Northwest Florida................29 14. Water Quality in Coastal Areas of Gulf and Southern Bay I ~~~~~Counties ............................ 47 5. Chemical Analyses of Water Samples from St. George Island Test Well .............................8 6. Proposed Monitor Well Locations and Rationales for Selection . ..53 7. Construction Specifications for Proposed Monitor Wells.......6 8. Recommended Parameters for First Network Sampling .........68 I ~~~9. Recommended Parameters for Long-Term Network Sampling .......69 I~~~~~~~~~~~~~~~V ABSTRACT The major ground-water quality concern along the coastal areas of the I ~~Northwest Florida Water Management District is contamination by salt water, due to either upooning or lateral intrusion caused by overpumping of ground 3 ~~water. Past problems in at least two coastal cities, Panama City and Port St. Joe demonstrate the fragile nature of the coastal ground-water setting and the I ~~potential for contamination due to overpumping. Although saltwater intrusion is not currently a major problem in the Northwest District, some areas are beginning to experience difficulties as increasing development along the coast 3 ~~creates a greater demand for water. The goals of this project are: 1) to evaluate the current position of the saltwater interface along the coastal 3 ~~area of the Northwest District; and 2) to design a long-term ground-water monitoring network to be used to monitor future changes in the position of the saltwater interface. This project concentrated on design of a monitoring 3 ~~system for the Floridan Aquifer, the major source of ground-water supply in the coastal areas of the Northwest District. 3 ~~~~Water quality in the Floridan Aquifer varies widely due to both natural and man-made factors. In general, the water in the Floridan Aquifer becomes Iincreasingly saline toward the west, as the aquifer dips more' deeply below the 3 ~~land surface. Localized areas of poorer quality water are found in the Choctawhatchee Bay area in southern Okaloosa and Walton counties, in the 3 ~~stretch of coast between Mexico Beach in Bay County and Cape San Blas in Gulf County, along the Apalachicola River in Franklin and Gulf counties and in the I ~~Spring Creek area of Wakulla County. Areas where saltwater contamination has I ~~~~~~~~~~~~vii occurred because of ground-water withdrawals include the Panacea area in Wakulla County, Panama City Beach and Tyndall Air Force Base in coastal Bay County and the Fort Walton Beach and Destin area in Okaloosa County, which appears to show a low-level increase in chloride concentration when compared to surrounding areas. A monitoring network of 65 wells is proposed to monitor potential saltwater movement in the coastal areas of Northwest Florida. The construction of 56 new wells is recommended, along with the use of nine existing wells. Proposed monitoring well depths range between 75 feet and 1200 feet and at least one monitoring well is proposed for each coastal county. A two step sampling program is proposed, with an initial comprehensive analysis of several water quality parameters to be followed with a long-term sampling and analysis program utilizing a limited number of indicator parameters. viii INTRODUCTION I ~~~~In October 198'4, the Northwest Florida Water Management District (NWFWMD) began work on an evaluation of ground-water monitoring requiremerits in the coastal area of northwest Florida. The main monitoring concern along 3 ~~the coastline is contamination by salt water, due to either upconing or lateral intrusion caused by over-pumping of ground water. Past problems in at I ~~least two coastal cities, Panama City and Port St. Joe demonstrate the fragile nature of the coastal ground-water setting and the potential for contamination due to overpumping. Although saltwater intrusion is not currently a major problem in the Northwest District, some areas are beginning to experience difficulties as increasing development along the coastline creates a greater I ~~demand for water. Certain areas of the District, because of their limited water resources, are more vulnerable to saltwater intrusion or upconing due to over-pumping caused by this increased demand. The goal of this project is the creation of a monitoring plan which will: 1) identify the current position of the freshwater/saltwater interface; 3 ~~2) provide for monitoring inland migration of the interface; and 3) assist in establishing minimum and management levels in areas where ground-water withdrawals are significant. The area covered by this project is shown in 3 ~~Figure 1. It is anticipated that the data produced by the implementation of this plan will provide valuable input into the NWFWMD Consumptive Use 3Permitting Program and will contribute to on-going water quality management planning efforts under the Water Quality Assurance Act. The plan is intended to be implemented jointly by NWFWMD and the U. S. Corps of Engineers. 3 ~~~~This report summarizes the results of the coastal area study. Principal tasks included: A L A B A M A < ESCAMBIA III HLE I I I h- JACKSON " 1 GI SANTA ROSA -i - OE G I A OKALOOSA WALTON 'WASHINGTON rJ1 r ~~~~~~~~~~~~~~~ADSDEN LO I. I I L~~~~~~~~~~~~~~~~~~~~~~~~~~JF CALHOUN -I ,- c B~ ~ ~ ~~~~~~~~~~AY r\)~~~~~~~~~~~~~~~~~~~~~ LIBERTY / WAKULLA / GULF INVESTIGATION AREA FIGURE 1- LOCATION OF AREA OF INVESTIGATION 0Review of' published geologic and hydrologic reports for coastal areas of the region and water quality and other pertinent data on file at the Northwest Florida Water Management District, U. S. Geological Survey (USGS), Florida Bureau of Geology (BOG), and the Florida I ~~~Department of Environmental Regulation (DER). Boring logs, driller's 3 ~~~~completion reports and geophysical logs for water wells in the coastal area were compiled and reviewed. 0 Construction of regional cross sections showing chloride 3 ~~~~concentrations versus depth in existing wells along the coastline. I ~~~0 Identification of zones of high and low permeability within the 3 ~~~~ground-water systems. 3 ~~~0 Identification of principal pumping centers in the coastal areas, including maps of current cones of depression and data on historical I ~~~~cones of depression and saltwater intrusion. 0 Identification of areas where additional monitoring is required to 3 ~~~~better define the movement and position of the saltwater/freshwater interface. 3 ~~~0 Preparation of a comprehensive monitoring plan of the monitoring needs of the coastal areas. The plan includes location and 3 ~~~~construction details of each proposed well. I ~~~~~~~~~~~~~~~3 Previous Work No comprehensive study of saltwater intrusion along the entire coast of the Northwest District has been conducted prior to this project. The Ambient Ground-Water Monitoring Program conducted by NWFWMD for DER contained in its Phase I report (Wagner and others, 1984) a map of the saltwater/freshwater interface along the District coastline. Data used in construction of that map is included in this report and provided an initial point for data collection. Florida Bureau of Geology reports, some of which surveyed the county ground-water resources, covered Jefferson County (Yon, 1966), Escambia and Santa Rosa counties (Musgrove and others, 1965a; Marsh, 1966), Okaloosa County (Clark and Schmidt, 1982), Walton County (Pascale, 1974) and Bay County (Schmidt and Clark, 1980; Musgrove, and others, 1965b; Foster, 1972). The U. S. Geological Survey has conducted several ground-water investigations in the Northwest District coastal area, including the Pensacola/Escambia County area (Trapp, 1975; Trapp, 1972; Coffin, 1982) and the Okaloosa, Walton and Santa Rosa county area (Trapp and others, 1977, Wagner, and others, 1980b; Hayes and Barr, 1983; Barr and others, 1985). The Northwest Florida Water Management District has completed three ground-water studies in the coastal area: Barr and others, 1981, which covers the water resources of southern Okaloosa and Walton counties, Barr and Wagner, 1981, which surveys the water resources of southwestern Bay County and Pratt and Barr, 1982, which covers the sand-and-gravel aquifer in southern Santa Rosa County. Another study currently in final stages covers ground-water quality and availability in the area between Destin in Okaloosa County and the Bay County/Walton County line. '4 Other, more general reports covering the area include Puri, 1954, Chen, 1965; Kwader and Schmidt, 1978; Wagner and others, 1985; Schmidt, 1983; Wagner, 1983, and Wagner, and others, 1980a. Areas of the Northwest District coastline which are not adequa'tely covered by existing reports include Jefferson, Wakulla, Franklin and Gulf counties. This part of the District is still relatively sparsely populated and contains large tracts of National Forest, swamp and marsh land, National Wildlife Refuge and planted pine forest without appreciable water well coverage. The coastal Ochlockonee River area is covered by Pascale and Wagner, 1982. Trapp, 1977, reported records of a deep potable water exploration well drilled in coastal Franklin County, while Cole (1945) has records of two oil test wells in Wakulla and Jefferson counties. A District study of Wakulla, Jefferson and Leon counties is currently ongoing. Other information used in this report comes from the NWFWMD well permitting files, USGS well completion reports and Florida BOG lithologic logs. Information on water use was supplied by the NWFWMD consumptive use permitting program by Kranzer (1983) and by the water use subtask of the Ambient Monitoring Program Phase I report prepared by NWFWMD for DER (Wagner and others, 1985). The Ambient report also supplied information on saltwater intrusion and District hydrogeology. Much of the water quality data available for the coast was collected during miscellaneous water resources studies through the years. A majority of the data was collected by the USGS, which maintains a computerized data file of water quality information. Other information was collected by NWFWMD, especially in southern Okaloosa and Walton counties. Some water quality information was supplied by DER Drinking Water Program records. 1 ~~~~~~~~~~~~~~~~5 I I Figure 2 shows locations of the wells used to provide data for this report. Appendix A lists the wells by name and site identification number. I Also given are well depths and casing depths related to mean sea level as well as the altitude of each well site. I I I I I I I I I I I I I I 6 3 1:. ~~~~~~~~~~A L A B A m A I" J A C\ K S I I~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~"� ���- ~~~~ bl , �--�;~~, 7 Fr I ~W A> 1>0 N WAS Nt ON N. ... . ... --~~~~8 I 5" NORTHW~~~~~~~P.5 K$ Ka1 E ST FLRIA DI WarringW AR MANAGEMENT DI STRICT WA K ~a-7WLJL 1 7EANMR ~~~WA I nt... i... 102 1�A Y WAT~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~EER TOANAGEENTDISTIC A FIGURE 2 LOCATION OF SELECTED WELLS-1 0 ��,~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~5 - SITE tO-IO "~~~~~~~~~~~~~~~~~~~~~~~~8 - WEL SIT MA UBR I~~� u....1p.Sndh I1LLI**...E~~~~~~ ~FIUR 2e ( LOCTIO OF~ SEECE WELL io ;oL MILES I~~~��~i , ~ " I I~~~~~~~~~~~~~~~~~~~Y~ I ~~~~WATER USE IN THE NORTHWEST FLORIDA WATER MANAGEMENT DISTRICT In general, ground-water pumpage in the Northwest District is concentrated in urban areas and along those portions of the coastline which have been fairly extensively developed. Major coastal ground-water users are I ~~concentrated around Pensacola (Escambia County) and Navarre Beach (Santa Rosa 3 ~~County), in the vicinity of Fort Walton Beach and Destin (Okaloosa County) where several major public water supply systems pump from the Floridan 3 ~~Aquifer, and in the vicinity of Panama City (Bay County). In addition, development is occurring at a rapid rate along coastal Okaloosa and Walton I ~~counties and the Cape San Blas area of Gulf County. 3 ~~~Ground-water pumpage along the Gulf of Mexico has resulted in water- level declines in several areas along the Gulf of Mexico coast in northwest 3 ~~Florida. The most severe declines in the Floridan Aquifer water level are found in the vicinity of Ft. Walton Beach where a regional extensive cone of I ~~depression has developed in recent years. Panama City and Port St. Joe are areas where cones of depression have developed in the recent past,' but conditions have returned to normal due to changes in sources for water. Saltwater intrusion due to pumping has been documented near Panacea in Wakulla County (Pascale and Wagner, 1982). Available data also indicates I ~~localized lateral intrusion or upooning of salt water at Panama City Beach in Bay County and possibly in coastal Okaloosa County. In some areas of the District, water of poorer quality occurs naturally within the Floridan 3 ~~Aquifer, causing potential problems for adjacent users and overlying water- bearing formations. These areas include south Walton County, areas west of 3 ~~Navarre Beach in Santa Rosa County, the area between Mexico Beach in Bay I ~~~~~~~~~~~~~~~~9 County and Cape San Blas in Gulf County, the Spring Creek/Shell Point area in Wakulla County and possibly the Apalachicola River basin in Franklin County. Major Water Users Major water users along the coastal areas of the Northwest District were identified through the NWFWMD Consumptive Use Permitting Program. Information on those facilities which have not yet applied for consumptive use permits was supplied by Kranzer (1983). For the purposes of this project, major water users are defined as those facilities in coastal areas which use more than 100,000 gallons of water per day. Appendix B lists major water users by county and shows well locations and permitted average and maximum daily usage. Table 1 provides a summary of ground-water use, by county, as permitted by NWFWMD. Table 1 .--Average and Maximum Daily Use in the Coastal Areas of the Northwest District. Average Use Maximum Use County (Mgal/d) (Mgal/d) Bay 2.18 4.86 Escambia 82.63 120.67 Franklin 1.02 2.13 Gulf 0.87 1.30 Okaloosa 20.31 42 16 Santa Rosa 16.17 24.61 Wakulla 0.38 0.59 Walton 3.24 5.76 TOTAL 126.80 202.08 10 H ~~~~~~Current and Historic Cones of Depression Fort Walton Beach Area I ~~~The Consumptive Use Permitting Program at NW~FWMD has identified the Fort Walton Beach/southern Okaloosa County area as an area of special concern because of significant Floridan Aquifer water-level declines. Declines of greater than 2410 feet have been recorded along the southern part of Fort Walton Beach and are generally more than 100 feet in the Fort Walton Beach area (Barr and others, 1981). Figure 3 shows the extent of the cone of depression. Available information does not show a widespread increase in I ~~chloride concentration in the area, even though the potentiometric surface of the Floridan is now below sea level over a wide area. Trapp and others (1977) attribute this to the low permeability of the Pensacola Clay, which overlies the Floridan throughout the area, and the original location of the saltwater interface, which they estimate to have been several miles offshore. Before I ~~development in the area, the potentiometric head of the Floridan Aquifer was as high as 63 feet above sea level at the coastline, with discharge from the Floridan limestones occurring offshore. Trapp and others (1977) assumed that much of the pumpage in the Fort Walton Beach area has intercepted water that would have discharged to the Gulf under natural conditions. I ~~~Although no significant saltwater intrusion problems have occurred in the Fort Walton Beach area, the large amount of drawdown that presently exists creates a great potential for problems to arise in the future. Data gathered for this report indicates slightly higher chloride concentration in the Okaloosa Island area as compared to surrounding coastal areas (See I ~~Figure 6). Consumptive use permits in this area are now granted for a maximum I ~~~~~~~~~~~~~~~~11 of five years duration, in order to evaluate the current water usage and effect on the aquifer. Bay County From the late 1930's through the mid 1960's, the Panama City area experienced large water-level declines in the Floridan Aquifer. Three major users, the International Paper Company, the Panama City public supply system and Tyndall Air Force Base, pumped large amounts of water from the Floridan Aquifer. By 1962, a sizable cone of depression had formed in theU potentiometric surface of the Floridan Aquifer, with water-level declines of 120 to 200 feet (Musgrove and others, 1965b). Although a sizable cone of depression existed for almost 140 years, saltwater intrusion into the Floridan Aquifer as a result of pumping was not documented. Musgrove and others (1965b) describe saltwater contamination ofI the Intermediate Aquifer (formerly referred to as the Secondary Artesian Aquifer) in the vicinity of Panama City in their report on the water resources of the Econfina Creek area. Highly saline water from two wells in the aquifer was observed during their field investigations. The saline water was presumed to have leaked through the Surficial Aquifer from nearby bodies of salt water.I The underlying Floridan Aquifer did not show any signs of saltwater contamination. Because of concern that continued pumping would eventually cause water- quality problems, the decision was made to convert to surface water as the main source of supply. Deer Point Lake Reservoir was created, and in JanuaryI 19614, began supplying water to the three major users. Floridan water levels recovered rapidly when pumpage stopped. Recovery at the center of the cone of 12I L~~~15 ( . I I I I I~~~~~~~~~~~~~~~~~~~~~~~~~ _ II~~~~~~~~~~~~~IE I~~~~~~~~~IL ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~FI ~-FELD2L 27 -50~~~~~~~~~~~~~5 ~~~~~~~~~~~~~~~~~~~~~ 30 I I~~~~~~~~~~~~L EXPLANATIONIEL / 5 0- POTENTIO?4ETRIC CONTOUR--Shows~~~~4 Contour interval, is 1~~~~~~0 an 0.et 20~~~~~~~~~~~~~~~~ y,2 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~17Is *1~~~~~~~~~~~~~~~~~~~~~~~~~~~25 <~~~~~~WL USDFRCNTO-Sos4liueOO M +~~~2W+R4 --R2A I L i . -.- A-~~T A FgRe3 MpsoInthpoetoeicsrceothupelietnofteFoiaaqfrinJy 1978~~~~~~~~~~~~~AT EC depression surrounding the International Paper Company well field was 163 feet I ~~within 51 days (Musgrove and others, 1965b). H ~~~~~~~~~~Port St. Joe A similar problem with water-level declines developed in the Port St. Joe area in Gulf County during the 1940O's (Wagner, written comm.). The major water user, the St. Joe Paper Company, withdrew water from the Floridan Aquifer. By the 1950's, water-level declines were already evident. When U ~~expansion created the need to increase the water supply from nine to 30 million gallons per day, a decision was made to develop a surface water supply. A 237mile long canal was dredged to the Chipola River and is currently used to supply the water needs of the paper company. The only current major use of water from the Floridan Aquifer is the City of Port St. I ~~Joe municipal supply, which withdraws about 800,000 gallons per day from a combination of Intermediate and Floridan Aquifer wells. Drawdowns of over 300 feet occur with pumping rates of less than J400 gallons per minute. I~~~~~~~~~~~~~~~1 HYDROGEOLOGY Hydrostratigraphy In the coastal areas of the Northwest District, three to four major water-bearing and up to three confining units may be present. The major aquifers and confining units in the study area are contained in the Middle Eocene to Recent Series, which consists primarily of marine limestones, sand and clay. As many of seven hydrostratigraphic units and as few as four are present in different areas along the coastline. Table 2 shows a generalized stratigraphic column for the coastal area of northwest Florida. The two major aquifers within the study area are the Surficial Aquifer, referred to as the Sand-and-Gravel Aquifer in the western third of the study area, and the deeper, confined Floridan Aquifer. The Surficial Aquifer is thin and produces limited amounts of water in the eastern part of the study area; however, it thickens considerably to the west and is the primary source of ground-water supply in coastal Escambia County. The Surficial Aquifer is composed of Pleistocene and Recent alluvium and terrace deposits. In the west, the Sand-and-Gravel Aquifer may include permeable portions of the underlying Intermediate System. The Floridan Aquifer consists of several hundred feet of marine carbonate formations and underlies the entire study area. The top of the Floridan Aquifer is at the land surface in the easternmost part of the study area and dips to over 700 feet below mean sea level in the southeastern Santa Rosa County and over 1450 feet below mean sea level in southern Escambia County (Wagner and others, 1985). Variations in lithology among the carbonate 17 formations comprising the Floridan Aquifer causes variability in their water- bearing properties. Generally, the Miocene age'Tampa Stage Formations, which make up the upper portions of -the Floridan Aquifer, are finer grained and have a greater clay content, reducing the ability of these formations to transmit water. The Oligocene and Eocene formations, especially the Ocala Limestone, are generally massive, well indurated, fossiliferous limestones, generally with well developed secondary porosity and a greater ability to transmit water. Three confining units exist in the study area. The Surficial and Floridan aquifers are separated by the Intermediate System confining unit, which varies in lithology. The formations which comprise the Intermediate System consist of sands, gravels, clays and low permeability carbonate materials. The Intermediate System is at its thickest at the westernmost edge of the coastal area and in the Apalachicola Embayment structural depression in Bay, Gulf and western Franklin counties. In parts of the study area, where localized lenses and layers of permeable material are present, an Intermediate aquifer (formerly known as the Secondary Artesian Aquifer) is present within the Intermediate System. In the western part of the study area, the Floridan Aquifer is divided into an upper and a lower limestone by the Bucatunna Clay confining unit. The Bucatunna Clay is absent east of the Okaloosa/Walton County line and the Floridan Aquifer is undifferentiated. The third confining unit is the Sub-Floridan Confining Unit, which consists of low permeability clastics and/or carbonate materials and functions as the underlying confining unit for the Floridan Aquifer. Further information on stratigraphy and the formations listed in Table 2 can be found in Yon (1966), Musgrove and others (1965a), Clark and Schmidt (1982), Pascale (1974), Schmidt and Clark (1980) and Schmidt (1983). 18 WEST SERIES EAST Sand-and-Gravel Alluvium and Terrace Recent Alluvium and Terrace Surficial Aquifer Deposits Pleistocene Deposits Aquifer Citronelle Formation Pliocene Miccosukee Formation Intermediate Coarse Intermediate System Clastics System Hawthorn Pensacola Formation Clay ____---Miocene Intracoastal Formation Upper LimestoneFomtn ofUpper Limestone Bruce Creek St. Marks FloridaUndifferen- Limestone Formation Floridan tiated Tampa Aquifer a i Chattahoochee F~ormation Chickasawhay at Oligocene Suwannee --_Bucatunna Clay uFormation Limestone Bucatunna Clay uana Confining Unit Bucayunna Clay Lower Limestone Ocala Limestone of the Ocala Limestone Floridan Aquifer Floridan Aquifer Lisbon Formation Eocene Undifferentiated ~/ Claiborne Stage Tallahatta Formation Sub Floridan Confining Unit Undifferentiated Undifferentiated ~~~~~~~~~~~~~~~~~~Wilcox Stage Wilcox Stage Undifferentiated Undifferentiated Midway StAe Paleocene Midway Stage Sub Floridan Confining Unit TABLE 2- GENERALIZED STRATIGRAPHIC COLUMN FOR THE COASTAL AREAS OF NORTHWEST FLORIDA Aquifer Characteristics The physical characteristics of an aquifer control the flow and storage of water within it. These factors are generally obtained by pumping a well at a constant rate and measuring the water-level decline (or drawdown) in a nearby observation well over a specified period of time. The most common characteristics measured in this way are: 1) aquifer transmissivity; and 2) storage coefficient. Aquifer transmissivity is a measurement of the rate at which water flows through the entire thickness of the aquifer. The storage coefficient is a measure of the amount of water released from aquifer storage per unit change in head. Most of the available aquifer characteristic information in the coastal area was obtained from single well specific capacity tests. In this type of test, the well is pumped at a constant rate and the drawdown measured at the end of a specified time. Ideally, the length of pumping is long enough so that the rate of decline has stabilized. The rate and total water-level decline in the well is dependent upon a number of parameters, including aquifer permeability, aquifer thickness, well diameter, the amount of the aquifer actually penetrated by the well, the amount of well development that took place before pumping, well efficiency and duration of pumping. The result of a specific capacity test is a value which is expressed as a ratio of the discharge of the well, in gallons per minute, to the drawdown in feet in the well at the end of pumping. It is possible to calculate an estimated transmissivity from specific 3 ~~capacity, however, determination of storage coefficient requires the use of water-level measurements from at least two wells. In the calculation of 21 estimated transmissivity, three other factors must be known besides specific capacity. These are well radius, length of time of pumping and an estimated storage coefficient. The equation relating these factors is (Walton, 1970): Q _ _ _ _ _ _ T s 264 log (- Tt ) - 65.5 10 2693 rw2 S Where: Q = pumping rate of well (gallons/minute) s = drawdown (feet) T = transmissivity (gallons/day/foot) t = time (minutes) rw = radius of the well (feet) S = storage coefficient (dimensionless) Use of this equation produces a value of transmissivity in gallons per day per foot. Transmissivity values were converted by dividing by 7.48 gallons per cubic foot to obtain a final value in feet2 per day. This equation assumes that: 1) the pumping well penetrates and is uncased through the entire saturated thickness of the aquifer, 2) well loss is negligible; and 3) the effective radius of the well has not been affected by drilling and development and is equal to the nominal radius of the pumping well (Walton, 1970). This equation also assumes some knowledge of the storage coefficient. However, as Walton (1970) points out, because specific capacity varies with the logarithm of the reciprocal of storage coefficient, large errors in storage coefficient would create relatively small errors in the calculated value of transmissivity. When known from nearby data, measured values of storage coefficient were used. In areas where no data was available, a value of 1 X 10 4 was used for the storage coefficient. Because of the hydrogeologic variety of the coastal areas of northwest Florida, a great deal of variability was evident in the estimated 22 transmissivities (See Table 3). In general, data was very limited, except in the Santa Rosa, Okaloosa and Walton coastal areas and for parts of Bay County. The major variability through the District appeared to be from area to area rather than with depth. In general, transmissivities in the Upper Limestone of the Floridan Aquifer range from 675 to 12,750 feet squared per day (ft2/day) in the Navarre Beach area, dropping to between 350 and 1050 ft2/day on the Eglin Air Force Base property to the east through and including Okaloosa Island service area. Transmissivity values increase in the Destin area to a high of 11,000 ft2/day in the South Walton County Utilities service area. To the east, values decline to the 500 to 1000 ft2/day range through Panama City Beach and Tyndall Air Force Base. Tests at the town of Mexico Beach yielded transmissivity values of 3700 and 10,200 ft2/day, but continuing eastward, low transmissivity values dominate in Port St. Joe and Cape San Blas and average 500 ft2/day or less. Transmissivities increase rapidly from Apalachicola eastward through Wakulla County, with tests on even relatively shallow wells yielding transmissivities of 2000 ft2/day or greater in the karst limestone regions of the coastline. Over the study area as a whole, not enough information is available to define zonations of transmissivity with depth. In Santa Rosa County, enough data was available to show a difference in transmissivity between wells completed in the upper part of the Upper Limestone of the Floridan Aquifer and wells that case off this zone and are completed at a lower depth (Figure 4). Data in the Panama City Beach area also suggests an increase in transmissivity with depth (Figure 5). Lithologic data suggests that this zonation may be District-wide. Throughout the District, the Suwannee and Ocala Limestones exhibit the greatest degree of secondary porosity development. In the coastal areas of the District, the Suwannee and Ocala limestones are overlain by the 23 less permeable Tampa Stage formations--the Bruce Creek, the St. Marks and undifferentiated Tampa Stage Limestones. Shallower wells completed in the less permeable Tampa Stage Formations would show a lower transmissivity than deeper wells completed in the more permeable Suwannee and Ocala limestones. 24 MSL 0- SURFICIAL AQUIFER 100- � 2O 2 2 2 2INTERMEDIATE 2 a200- P ~. I. rp tXSYSTEM 200- � - . 'I , 300- '-' ~" FLORIDAN 11.o AQUIFER 400- 500- 600- - 700- 800- 900- VALUES IN FT2/DAY VERTICAL SCALE = 1 INCH TO 100 FT HORIZONTAL SCALE = 1 INCH TO 8333 FT - OPEN HOLE INTERVAL OF WELL FIGURE 4 -VERTICAL ZONATION OF TRANSMISSIVITIES IN THE VICINITY OF PANAMA CITY BEACH, BAY COUNTY MSL 0 SURFICIAL AQUIFER 100- 200 - 300- INTERMEDIATE SYSTEM 400- i o00- " 600- 700- _ _"l LOW __ - PERMEABILITY 8s00 - ZONE 800-- ,-. ~ gUPPER LIMESTONE ~~900-~ I OFITHE-A "___ "" '_-AQUIFER - -" ..- HIGH 1000- II PERMEABILITY ZONE 1100- "/ _ __00- --- BUCATUNNA CLAY 1200- _ VALUES IN FT2/DAY VERTICAL SCALE = 1 INCH TO 100 FT. HORIZONTAL SCALE-1 INCH TO 8333 FT I- OPEN HOLE INTERVAL OF WELL FIGURE 5 - VERTICAL ZONATION OF TRANSMISSIVITIES IN THE VICINITY OF NAVARRE BEACH, SANTA ROSA COUNTY Table 3.--Representative Estimated Transmissivities for the Coastal Areas of Northwest Florida. Total Casing Specific Transmisr- Well Depth Depth Capacity sivity No. Well Name (Feet) (Feet) (Gal/Min/Ft) (Ft2/day) 1 West Observation Well 1020 840 11.46 3400 2 Navarre Beach #1 950 810 2.2 675 3 Navarre Beach #2 1051 782 34.0 9600 4 Navarre Beach #3 1030 925 46.7 12750 5 East Observation Well 940 730 1.4 900 7 Eglin A-13 835 654 3.0 450 9 Eglin A-10 822 580 3.8 1050 10 Eglin A-7 738 538 1.7 500 12 Okaloosa Island Auth #4 736 545 2.7 750 14 Okaloosa Island Auth #2 845 455 1.3 350 13 OKaloosa Island Auth #3 867 528 1.2 300 16 Eglin A-3 735 505 1.7 450 20 Destin #3 731 450 37.6 11650 23 NWFWMD Crystal Beach 710 380 28.0 9000 24 South Walton #3 554 410 181.8 11000 26 South Walton #2 595 395 22.2 6150 27 South Walton #4 554 410 181.8 11000 31 Dune 1 Floridan 443 321 1.6 500 43 InletBeach #1 427 94 4.4 625 44 Inlet Beach #2 578 231 1.1 280 46 Panama City Beach #1 733 313 27.8 8500 51 Panama City Beach #7 426 284 2.4 600 52 Panama City Beach #8 439 275 1.8 450 55 US Navy Mine Defense Lab #3 473 250 3.9 1000 56 Point Royale Development 525 284 2.1 575 64 Tyndall AFB #4 411 332 11.6 3165 66 Mexico Beach #1 485 412 13.8 3700 67 Mexico Beach #2 590 190 22.9 10200 69 Port St. Joe #3 656 420 1.6 450 71 Lighthouse #2 623 422 1.2 500 80 Apalachicola #4 465 330 22.0 5850 81 Bobby Kirvin 376 285 16.1 5000 85 Leisure Properties #1 263 170 8.6 2300 86 Allan C. Hubanks 96 90 7.6 2250 90 Emily Kemp 109 96 9.3 2800 29 Table 3.--Representative Estimated Transmissivities for the Coastal Areas of Northwest Florida. - (continued) Total Casing Specific Transmis- Well Depth Depth Capacity sivity No. Well Name (Feet) (Feet) (Gal/Min/Ft) (Ft2/day) 93 Town of Panacea 57 40 2.5 700 94 Panacea #2 79 42 13.2 3375 95 Panacea #4 113 78 16.7 4800 98 TEC Gulf Coast #2 189 62 52.9 17500 99 TEC Shell Point #1 178 , 31 1.0 275 30 I ~~~~~~~~~~WATER QUALITY I ~~~In examining the existing water quality of the coastal area of northwest Florida, chloride concentration was used to indicate the possible extent of saltwater influence on 'the quality of water in the Floridan Aquifer. Chloride concentration was used because it is a good indicator of saltwater movement and because chloride was the only water quality parameter measured in most wells. In some areas information on other water quality parameters is available and is summarized in this report. An effort was made to use the most recent data available; however, in some areas, especially in Bay County, the only available water quality information dates from the late 1950's and early 1960's. I ~~~Water quality in the Floridan Aquifer varies widely due to both natural and man-made factors. As a trend, the Floridan becomes increasingly saline towards the west, as the limestone formations which comprise the Floridan dip 3 ~~more deeply below the land surface. Localized areas of poor quality water are found in the Choctawhatchee Bay area, in the Apalachicola River area in Gulf I ~~and Franklin counties, in Bay and Gulf counties, where highly mineralized water is known to exist at relatively shallow depths within the Floridan Aquifer and in the Spring Creek area, where the saltwater/freshwater interface may be located inland from the coast. Other areas, such as the Fort Walton Beach area, appear to show a low level increase in chloride concentrations Iattributable to large Floridan Aquifer withdrawals. In order to examine the relationships of geology and water quality, a series of cross sections was constructed. Tops and bases of aquifers and 3 ~~confining units, as identified by Wagner and others (1985) were plotted for selected wells along the coast. Chloride concentrations and depth were then 31 plotted for all Floridan depth wells with available data. The resultingI cross sections were contoured to show the approximate positions of the 503 mg/L, the 100 mg/L and the 250 mg/L isochlors. The result is an approximate picture of how chloride concentrations vary with depth along the coast.3 Because the chloride concentrations are plotted as occurring at the bottom of the well, the picture shown is somewhat optimistic. Most of theI wells used as data points have large lengths of open hole. When the well is3 pumped, water can enter the borehole along the entire length of the open hole, although most of the water is produced from the more permeable intervals3 within the aquifer that the well penetrated. Therefore, the collected sample is a composite of water from the different zones that the well penetrates.I Since more saline water generally occurs with depth, using this composite chloride concentration results in a cross section which shows better water quality than is probably actually present at the bottom of the well. The3 cross sections are still the best method of utilizing the available information because they show trends in chloride concentration in the aquifer,I even if the numbers may be somewhat low, and because they show the chloride3 concentrations as pumped from the wells that the monitoring system is designed to protect.3 Enough data is available from Santa Rosa County to the Gulf County/Franklin County line to indicate patterns of chloride distributions (See Figures 6 through 8.) Eastward from Gulf County, however, data was extremely limited. Lithology data shows both the Surficial Aquifer and the confining unit of the Intermediate System thinning, until finally, the3 Floridan Aquifer is at or very near the surface in coastal Jefferson and Wakulla counties. Chloride data is only available for scattered locations3 323 along the coast in this area and no clear trends were evident. The data available for this area is shown on Figure 9. Santa Rosa County Through Walton County Because the coasts of Santa Rosa, Okaloosa and Walton counties have undergone more development than other areas of the District, a good coverage of data is available for this area (Figure 6). This area of the coastline shows the most variation in lithology. At the westernmost part of the cross section, the Surficial (Sand-and-Gravel) Aquifer is approximately 150 feet thick and the Intermediate System is represented by a 600+-foot thickness of confining sediments. The top of the Upper Limestone of the Floridan Aquifer is at about 740 feet below mean sea level and the Bucatunna Clay is present at approximately 1150 feet below mean sea level in this area. At the eastern end of the figure, at the Walton County/Bay County line, the Surficial Aquifer has thinned to about 50 feet and the Intermediate System is only about 200 feet thick. The top of the Floridan is at approximately 250 feet below mean sea level. The Bucatunna Clay is no longer present and the Floridan Aquifer is undifferentiated. The area of coast covered by this cross section also shows a large amount of variability in water quality. The five wells associated with Navarre Beach, with chloride concentrations ranging from 100 to 150 mg/L, mark the westernmost limit of use of the Floridan Aquifer for water supply in the coastal area. Chloride concentrations appear to decrease rapidly away from the coast. Northwest of Navarre Beach, on Fair Point Peninsula, water in the Floridan Aquifer is considerably fresher, with chloride concentrations between 33 20 mg/L and 70 mg/L measured in the Floridan depth wells of the Midway and Holley Navarre Water Systems. Water quality gradually improves toward the east. An apparent slight upconing of poorer quality water is seen under the Okaloosa County Island and Destin service areas, with chloride values ranging between 60 and 75 mg/L. An estimate of water quality as interpreted from geophysical logs is available for the NWFWMD Crystal Beach well at the Okaloosa/Walton County line. Chloride concentrations of 100 mg/L were estimated for the interval from 422 to 622 feet, with a rapid increase in concentration to 1,500 mg/L measured at the total depth of 708 feet below mean sea level. A sample collected from the well showed a chloride concentration of 35 mg/L, indicating that most of the water is produced from shallower, fresher zones within the aquifer. At approximately the Walton County/Okaloosa County line, the Bucatunna Clay is absent or thins to the point where it no longer effectively separates the Upper and Lower limestones of the Floridan Aquifer. Water in the Lower Limestone is more saline and under a higher head than water in the Upper Limestone. Where the Bucatunna Clay is absent, poorer quality water from the Lower Floridan can move upwards, causing degradation of the water in the upper part of the aquifer. High concentrations of chlorides are measured in wells penetrating the Floridan Aquifer in this vicinity. Many of the chloride concentrations exceed the Florida Maximum Contaminant Level for drinking water of 250 mg/L. Chloride concentrations as high as 1045 mg/L have been measured in domestic wells on the southern shore of Choctawhatchee Bay. A previous investigation by Barr and others (1981) found that elevated chloride concentrations were also present on the north side of Choctawhatchee Bay. Chloride concentrations are generally low to very low to the east and the west of this area; concentrations in the South Walton Utilities wells immediately 34 I ~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~GRAYTON SEAGROVE NAVARRE REACH OKALOOSA ISLAND PRESETDSI FUTURE DESTIN WALTONT SUTILT SFUTUEBAH BEALTO SERVICE AREA SEIR7".-- ~ ~ ~~COMPANY UTILITY COMPANY I ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~SERVICE AREA SERVICE AREA MSL MSL SURFICIAL AQUIFER SURFICIAL AQUIFER -300- --100 -400- ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~~~~~~~~~~~~~~~~~INTERMEDIATE SYSTEM 1 I -200 --200~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~09 co -200- b0070 -0 S~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*9 I-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~3 -600-0 --600 ~~~~~~N-G LU _700- 0~~~~~~~N35 -- 0N .-T0o .66 02- -So UPPER LIMESTONES __e-MCATUN OF01 6 7 CONIIN NITEXLNTATION -1000- b. 0-ETR NEVLOE OFLORIDAN AQUIFER --10o0 OF9Q0A CHLORIDE CONCENTRATIONS IN MILLIGRAMS PER LITER. UNIT - ~~~~~~~~~~~~~~ CHLORIDE CONCENTRATIONS -II00~~~~-50LKEOFEUA CLOIE ONETRTIN I MLIGAM ERLIE I ~~~~~~~~~~~~FIGURE 6 - CHLORIDE CROSS-SECTION ,NAVARRE BEACH, SANTA ROSA COUNTY TO INLET BEACH, WALTON COUNTY west of the Okaloosa/Walton County line range from 15 to 35 mg/L. The potential for movement of this poorer quality water toward South Walton Utilities wells exists and should be carefully monitored. Not enough information was available to construct water quality cross sections for other ion concentrations besides chloride. However, water quality in this area has been examined in several recent reports (Barr and others, 1985; Barr and others, 1981, Trapp and others, 1977 and Pascale, 1974) and some information on sodium and fluoride concentrations is available. According to Barr and others (1981), high sodium concentrations are found in the Floridan Aquifer in southeastern Walton County, southeastern Okaloosa County and southern Santa Rosa County. In coastal and western Okaloosa counties, sodium concentrations range from about 100 mg/L to more than 160 mg/L, with wells in the eastern Choctawhatchee Bay area showing sodium concentrations exceeding 300 mg/L (Barr and others, 1985). High sodium concentrations are generally found in wells with high chloride concentrations, indicating some degree of mixing with saline water from deeper zones or with sea water. Trapp and others (1977) report elevated fluoride concentrations (values greater than 1.0 mg/L) in the southwestern part of Okaloosa County and in a strip along the coast extending to Destin. Bay County From west to east across coastal Bay County, lithology remains fairly constant (Figure 7). The thickness of the Surficial Aquifer varies between about 50 feet and 100 feet. At the western edge of the cross section, the Intermediate System is approximately 200 feet thick. The Intermediate thickens gradually to the east towards the axis of the Apalachicola Embayment 37 structural depression, reaching a thickness of about 1400 feet at the Bay County/Gulf County border. The top of the Floridan Aquifer is atI approximately 250 feet below mean sea level in the west, dipping to 4I50 feet below mean sea level in the east. Chloride concentrations vary from west to east along the Bay County coast. The upper 100 to 200 feet of the Floridan Aquifer has water with less than 50 mg/L of chlorides from Tyndall Air Force Base westward. Chloride concentrations increase with depth, with higher concentrations found under Panama City Beach and Tyndall Air Force Base. Because the available data ranged in age from the early 1960's through the 1980's and is very scattered,3 this trend cannot be defined with any accuracy. However, it appears that high chloride concentrations (250 mg/L or greater) can be found in the Panama City Beach area at depths as shallow as 600 feet below mean sea level. At Tyndall Air Force Base, one 600-foot deep well showed a chloride concentration of 330 mg/L.3 According to Barr and Wagner (1981), chloride concentrations in the Panama City Beach public supply wells indicate a clear distribution of chlorides with depth. Wells #7 and #8, which are less than 500 feet in depth, show chloride concentrations of 9 and 16 mg/L, respectively. The other tenI wells, which range in depth from 708 to 8714 feet, show chloride concentrations of 102 mg/L to 2~44 mg/L. One well, Well #6 has been abandoned because of high chloride concentrations. Barr and Wagner (1981) attribute high chloride3 concentrations in these wells and in the Tyndall Air Force Base wells to a decline in the potentiometric surface of the Floridan Aquifer caused by heavyI pumping and insufficient spacing between wells. This decline in the3 potentiometric surface allows more saline water under higher pressure deeper in the aquifer to move upwards into the fresher zones tapped by the wells. 38I PANAMA CITY BEACH ITYNDALL AFB j MEXICO BEACH I ~~~~ ~~~~~MSL WALTON CO. I BAY CO. SAY CO. IGULF CO. MSL SURFICIAL AQUIFER SURFICIAL AQUIFER INTERMEDIATE SYSTEM .-200--0 INTERMEDIATE SYSTEM -Boo- __300~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~0 -300- _0 FLORIDAN AQUIFER~~~~~~~~~~~~~~~~~~O - ----- -~ ----- - - 070 ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~~ ~~~~~~~~~~~~~~~~~~~~9 I~~~~~~~~~~~~~~~~r 'B330 -Soo- 250 16~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~0 -600 ~~~~~~~~~~~~~~~~~~~ N~ ~ ~ ~ ~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~o 210, FLORIDAN AQUIFER -7(0- ~ ~ ~ ~ ~ ~ 8 244 --- �-__ EXPLANATION -900---o 0 -DEPTH OF CONTROL WELL I 390 - CHLORIDE CONCENTRATIOR IN MILLIGRAMS PER LITER.~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~39 CLOIE ONENRAIO I ILIGAM PR ITR 1000- FOR ENTIRE INTERVAL OPEN TO FLORIDAN AUUIFER --1000~~~~~~~~~~~~~~~~~~~~~~~~OR NTREINERALOPN O LOIDN QUFE - 50 -LINE OF EQUAL CHLORIDE CONCENTRATIONS IN MILLIGRAMS PER LITER 11 5001 - MEASURES DR CALCULATED CHLORIDE CONCENTRATIONS _1100- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~AT TOTAL.DEPTH OF WELL -10 FIGURE 7 -CHLORIDES CROSS-SECTION, DAY COUNTY Increases in chloride concentrations with depth can also be seen in the Panama City Beach area at the U. S. Navy Mine Defense Laboratory. In wells #1 and #2, with total depths of approximately 600 feet below mean sea level, I ~~measured chloride concentrations have ranged between 220 mg/L and 320 mg/L. A shallower well, Well #3, later constructed in the same location to a total depth of 4~73 feet below mean sea level, has chloride concentrations of 90 mg/L. Water quality problems are evident in two other areas in coastal Bay I ~~County. One is the Mexico Beach area, discussed in the next section, where elevated fluoride concentrations have caused the removal of a public water supply well from service. Foster (1972) described a tongue of Floridan Aquifer water with high fluoride concentrations extending up the coast of southern Bay County from the Bay County/Gulf County line to approximately St. I ~~Andrews Bay. The other area is at the Bay County/Walton County line. Chloride concentrations of 91 mg/L have been measured at the Camp Helen well in Bay County while the Inlet Beach wells, about two miles away in Walton County, showed chloride concentrations of 22 mg/b and 53 mg/b at similar depths. I~~~~~~~~~~~~~~~~~~4 Gulf County to Jefferson CountyI Chloride concentration data becomes increasingly sparse from Bay CountyI eastward (Figures 8 and 9); The Surficial Aquifer remains about 50 feet thick through Gulf County but thins gradually through Franklin and Wakulla counties until it is represented by less then five feet of surficial sands. The Intermediate System maintains a thickness of between 1400 and 500 feet through Gulf County, then thins on the eastern flank of the Apalachicola Embaym entI structural depression in Wakulla County until it disappears entirely in3 coastal Jefferson County. The top of the Floridan Aquifer, which is at approximately ~400 to 500 feet below land surface in Gulf County, rises to the land surface at the vicinity of Cobbs Rocks in coastal Jefferson County. Elevated fluoride levels have been reported from wells along the coastI from the vicinity of Mexico Beach, near the Bay County/Gulf County line, to3 Cape San Blas in Gulf County (Figure 8). In these wells, high fluoride and sodium levels are associated with relatively low chloride concentrations (SeeI Table 14). At the Mexico Beach Well #1, fluoride concentrations were 3.1 mg/L, with sodium concentrations of 1410 mg/L and chloride concentrations of 96 mg/L.I In the Port St. Joe municipal Well #1, fluoride concentrations were 2.5 mg/L, with sodium concentrations of 22 mg/L and chloride concentrations of 1 2 mg/L. At Cape San Blas, fluoride concentrations ranged between a high of 13 mg/L on the Cape to 0.72 mg/L. on the mainland. Insufficient data is available to further define the extent of the high fluoride area or to indicate whether itI is caused by upconing of saline water or is naturally present in the Floridan. Since the Florida Maximum Contaminant Level for fluoride in drinking water is 1.41 mg/L, these elevated concentrations are of concern because the water 142I CAPE SAN BLAS / INDIAN PASS MEXICO BEACH PORT ST. JOE APALACHICOLA EASTPOINT I MSL BAY CO. j GULF CO. GULF CO. FRANKLIN CO. SURFICIAL AQUIFER INTERMEDIATE SYSTEM -200- INTERMEDIATE SYSTEM FLORIDAN AQUIFER -400- 16 -500- --500 9.5 FLRIDAN N/ N N - --__600 FLORIDANAQUIFER 2" -7 00- -700 -coo- -------- EXPLANATION --go0 I -800- - DEPTH OF CONTROL WELL -900- 390 - CHLORIDE CONCENTRATION IN MILLIGRAMS PER LITER. --900 FOR ENTIRE INTERVAL OPEN TO FLORIDAN AQUIFER - 50 - LINE OF EQUAL CHLORIDE CONCENTRATIONS IN MILLIGRAMS PER LITER -1000- 15001 - MEASURED OR CALCULATED CHLORIDE CONCENTRATIOS -100ooo0 AT TOTAL DEPTH OF WELL -Iloo- --l0oo FIGURE 8 - CHLORIDES CROSS-SECTION, GULF AND FRANKLIN COUNTIES. -'"I--- ~ ~ ~~~~~ It -] - J ~~~~~~A CK S0N I N, ~~~~~~~~SANT\ 9A&,'.s,-,. :.:1 Y ~~~~~~~~~~~~~-.A D V 4 I ~~~~~~~~~~~ ~ ~~~~~~120 Mu% -- I ~~~~~~~~~~~~~NORTHWEST FLORIDA WATER MANAGEMENT DISTRICT rML --' - K 280 ~~~~~~~~~~~~~~~~~~Ma/L~ 4 .~ 74 Mg/C-'-~~~ .~-'10250 Mg/L s.s. ~ - - .6 gIL ~2~3Mg/L 70 yMg/L CuS.K~~n.- 16Mg/I EXPLANATION S-LOCATION OF CONTROL WELL 11 Mg/I - CHLORIDE CONCENTRATIONS IN MILLIGRAMS PER LITER FOR ENTIRE INTERVAL OPEN TO FLORIDAN AQUIFER J.y I L ESR cannot be used for public water supply. The city of Mexico Beach was recently directed to remove a well from service because of high fluoride concentrations. A new well constructed to a greater depth showed initial low levels of fluoride. Table 4.--Water Quality in Coastal Areas of Gulf and Southern Bay Counties._ Well Chloride Sodium Fluoride Date No. Well Name mg/L mg/L mg/L Sampled 66 City of Mexico Beach #1 96.0 140.0 3.1 05/62 67 City of Mexico Beach #2 14.5 0.1 09/82 68 Port St. Joe #1 12.0 22.0 2.5 03/74 70 Lighthouse Utilities #1 4.5 40.0 1.1 01/83 71 Lighthouse Utilities #2 4.9 9.5 0.7 06/85 74 Eglin Site D-3, Well #1 8.0 160.0 13.0 09/62 75 Eglin Site D-3, Well #2 8.0 160.0 9.0 03/69 Chloride concentration data is very incomplete east of this area and consists mainly of information at towns along the coast. For this reason, data from wells east of Apalachicola are shown on a map (Figure 9) instead of on a cross section. Water quality in the Apalachicola area is apparently poor. One domestic well showed chloride concentrations of 132 mg/L, while a flowing well of unknown depth at Apalachicola has consistently showed chloride concentrations of between 620 and 820 mg/L. Limited data suggests that chloride concentrations may be high inland along reaches of the Apalachicola River basin. Chloride concentrations of 206 and 231 mg/L were measured in two Floridan depth wells at the MK Ranch, located about 15 miles from the coast and within five miles of the Apalachicola River in Gulf County. 47 In 1971, a 1,026-foot deep well was drilled on St. George Island in search of a source of water supply. Trapp (1977) reports that the water from the well was too saline to be usable. Samples were taken at four depths and analyzed for a variety of parameters. Table 5 shows concentrations of chloride, sodium fluoride and total dissolved solids at the sampled depths. This data suggests that the saltwater/freshwater interface is located between St. George Island and the mainland of Franklin County. Table 5.--Chemical Analyses of Water Samples from St. George Island Test Well. Depth Chloride Fluoride Sodium Total Dissolved (Feet) Date (mg/L) (rmg/L) (mg/L) Solids (rag/L) 217 08/23/71 800 0.1 295 1640 470 08/25/71 14400 0.6 7840 27100 602 09/03/71 12800 1.6 6910 24000 1026* 08/25/72 2100 0.1 950 ------ Casing had been pulled and lower part of well may have caved. Source: Trapp, 1977. Information at Eastpoint, in Franklin County shows relatively low chloride concentrations, as does available data for Carrabelle and the Alligator Point vicinity. Chloride concentrations in the vicinity of Panacea are fairly low, generally less than 50 mg/L. However, Pascale and Wagner (1982) document a case of saltwater intrusion near Ochlockonee Bay south of the town of Panacea. Two water supply wells were constructed in 1965 and used until 1970, when chloride levels increased sharply. One of the wells was 48 abandoned and the other is presently only used for emergencies. In 1968, the Bureau of Geology drilled and sampled a series of test wells in the area and found that the aquifer naturally contained salt water below 160 feet below mean sea level. The presence of the salt water in the Panacea wells was attributed to upconing caused by withdrawals. Eastward of Panacea, the next available data is for the Spring Creek/ Shell Point area in Wakulla County. Floridan depth wells sampled in this area showed a large amount of variability in chloride concentration. A chloride concentration of 10250 mg/L was measured in a shallow Floridan well at the coast. At about 2.5 miles inland, the Talquin Electric Cooperative's (TEC) Shell Point wells show chlorides of 120 mg/L and 112 mg/L. At two other TEC wells approximately one mile further inland, chloride values have dropped to 23 mg/L and 31 mg/L. This data may indicate a steep sharp saltwater/ freshwater interface inland of the coast. The easternmost available data point is at the St. Marks Wildlife Refuge and shows 11 mg/L of chloride at a depth of 60 feet below'mean sea level. No information is available for coastal Jefferson County. 49 I ~~~~~~~~COMPREHENSIVE MONITORING PLAN N ~~~~In designing a ground-water monitoring network for the coastal regions of the northwest District, several factors must be considered. First, the network should be designed as a long-term network. Well sites must be undisturbed and accessible over a long period of time and the well construction should be such that the wells will function for at least 20 I ~~years. Second, because of the lack of data in some parts of the study area, the network must be designed to collect basic data in some areas while also serving as a monitoring system overall. In some locations, it may be 3 ~~necessary to monitor more than one zone or to space monitor wells more closely together. Third, the network should be designed to monitor saltwater movement I ~~as efficiently as possible. In any long-~term ground-water monitoring system, 3 ~~the major expense is not the construction of the wells but rather the expense of sample collection and analysis that continue over the years. Therefore, 3 ~~the well location, the well construction and the parameters for which the well is tested must all be carefully considered. Fourth, the network shoul d I ~~include the use of existing monitoring wells along the coast, where they meet 3 ~~the requirements of this program. In many cases, wells were constructed specifically for monitoring and are designed to monitor the same zones 3 ~~indicated by this study as zones of interest. These wells have the advantage of already having existing water quality data that can be used to supplement I ~~future data collected by the network. 3 ~~~~There are four types of areas along the northwest District coast where additional ground-water monitoring is needed. These areas include: 1) areas 51 of little or no data; 2) areas which show current saltwater movement or have1 experienced saltwater intrusion in the past; 3) areas of large ground-water withdrawals and associated drawdowns; and 14) areas where rapid development is occurring, with an associated greater demand on the ground-water resources. At some locations, construction of more than one monitor well is proposed to monitor zones of variable water quality. Some inland locations are proposedI to monitor effects of cones of depression or to delineate areas of suspected1 saltwater contamination. The following sections detail the recommended monitor well locations by county. General areas are specified rather than exact sites. It has been the experience of the NWFWMD in the construction of another long-term ground-waterI monitoring network that the exact site of a well is determined by such factors as ownership of the land, length of time over which access to the well will be possible and ease of access. Actual siting of each well must be done on an individual basis. Table 6 summarizes recommended monitor well locations and rationales for their selection. Figure 10 shows proposed monitor wellI locations. Monitor Well Locations Jefferson CountyI The construction of one well is proposed for coastal Jefferson County. This area is largely unpopulat~d and is unlikely to face a large increase in water use. One well should be adequate to characterize the wa ter quality and 52 Table 6.--Proposed Monitor Well Locations and Rationales for Selection. Well No. Monitor Well Location Location Rationale Jefferson County 1 Coastal Jefferson County No Data Wakulla County 2 St. Marks Wildlife Refuge No Data 3 Wakulla Beach-Shallow No Data 4 Wakulla Beach-Deep No Data 5 Shell Point Area -Onshore No Data/Saltwater Interface Onshore 6 Shell Point Area-Inland No Data/Find Saltwater Interface 7 Panacea-Shallow Saltwater Cont amination 8 Panacea-Deep Saltwater Contamination 9 Ochlockonee Point No Data Franklin County 10 Lighthouse Point No Data 11 St. Teresa No Data 12 Lanark Village No Data 13 Carrabelle-Shallow No Data 14 Carrabelle-Deep No Data 15 Royal Bluff No Data 16* Eastpoint Ambient Well Recently Drilled Well of Known Construction 17 St. George Island No Data 18 Apalachicola-Shallow No Data/Possible Saltwater Contamination 19 Apalachicola-Deep No Data/Possible Saltwater Contamination Gulf County 20 Apalachicola Embayment No Data/Possible Saltwater Contamination 21 Apalachicola Embayment No Data/Possible Saltwater Contamination 22 Apalachicola Embayment No Data/Possible Saltwater Contamination 23 Eleven Mile No Data 24 St. Joe's Spit Elevated Fluorides 25 Cape San Blas Elevated Fluorides 26 Between McNeil's and Elevated Fluorides Port St. Joe 53 Table 6.--Proposed Monitor Well Locations and Rational-es for Selection. -(continued)__ _ _ - wellI No. Monitor Well Location Location Rationale 27* Port St. Joe Ambient Well Recently Drilled Well of Known Construction, High Fluorides 28 Between Mexico Beach and No Data, High Fluorides Port St. Joe Bay County1 29 Mexico Beach-Shallow High Fluorides, Total Dissolved Solids 30 Mexico Beach-Deep High Fluorides, Total Dissolved Solids 31 Tyndall AFB No Recent Data, Indications of PossibleI 32 Tyndall AFB Saltwater Contamination in Past 33 Tyndall AFB 314* Panama City Ambient Well Recently Drilled Well of Known Construction 35 Southport Large Withdrawals, No Data 36 St. Andrews State Park Saltwater Interface at 600 Ft. Below MSL 37 Point Royale Saltwater Interf ace at 600 Ft.- Below MSL 38 Panama City Bch-Shallow No data, Permeability ZonationI 39 Panama City Bch-Deep No data, Permeability Zonation 140 West Panama City Beach Saltwater Interf ace at 600 Ft. Below MSL 141 Camp Helen High ChloridesI Walton County 142 Camp Creek/Eastern Lake Monitor High Chloride ConcentrationsI 143 Seagrove Beach Need Data at Depth to Define Interf ace 144* Point Washington Area of High Chloride Concentrations 145 North of Choctawhatchee Bay See Above 146 Blue Mountain Beach Area See Above 147* W. A. Holley See Above, Long-Term Data Available 148* West'Hewett Monitor Well of Known Construction 149 Between S. Walton Utilities Monitor Movement of Salt Water in Response and Salt Water to Pumping 50 S. Walton Utilities #5 See Above Okaloosa County 51 NWFWMD Crystal Beach Monitor Well of Known Construction 52 Destin Monitor Effect of Destin Pumping, Fort Walton Beach Cone of Depression 53 Okaloosa Island--Deep Need Data at Depth to Define InterfaceI 514 Okaloosa Island--Shallow Investigate Permeability Zonation, Effects of Large Withdrawals and Cone of Depression 514I Table 6.--Proposed Monitor Well Locations and Rationales for Selection. - (continued) Well No. Monitor Well Location Location Rationale 55 Well in Vicinity of Area of Large Drawdown, Possible Saltwater Okaloosa County ISL-6 Intrusion 56 Near Seashore Village #1 Monitor Effects of Fort Walton Beach Cone of Depression 57 Mary Esther Area As Above 58 Shalimar Area As Above Santa Rosa County 59 Eglin AFB on Santa Rosa Need Data, Monitor Effect of Fort Walton Island, Santa Rosa County Beach Area Drawdowns 60* Navarre Beach, East Well Existing Monitor Well in Area of Interest 61' Navarre Beach, West Well Existing Monitor Well in Area of Interest 62 Midway Area Area of Increasing Development 63 West of Navarre Beach No Data, Locate Interface 64 West of Midway As Above 65 Between Holley and the As Above Yellow River * Existing well proposed for inclusion in monitoring network. 55 Wakulla CountyI The construction of eight wells is proposed for coastal Wakulla County. The wells in the Panacea and Shell Point areas are designed to investigate possible saltwater movement that was indicated by existing data. In the Shell Point area, a shallow well is proposed close to the shore, with a deeper well one to two miles inland, both placed between the Talquin Electric CooperativeI public supply wells and the coast. Both a shallow and a deep well are proposed for the Wakulla Beach area and for the Panacea area to provide information on transmissivity zonation within the Floridan and to provide better information on the depth of the saltwater/freshwater interface. Other wells are proposed for St. Marks Wildlife Refuge and Ochlockonee Point.I Franklin County Ten wells are proposed for Franklin County, including one existing Floridan depth well recently constructed at Eastpoint for the Ambient Ground- Water Monitoring Program. Wells are proposed at Lighthouse Point, St. Teresa, Lanark Village, Carrabelle and Royal Bluff to provide data where none currently exists. Both a shallow and a deep well are proposed for Carrabelle, to investigate transmissivity zonations and the depth of the saltwater/freshwater interface. Two wells are proposed for the Apalachicola area, one shallow and one deep, to investigate the potential source of the high chloride water in the Floridan Aquifer in that area. One well is proposed for St. George Island to better define the location of the saltwater/freshwater interface. 56 87. 86� 5 A L A B A M A 7 --a~ ." -" r-� -- jI~~~~~~~~~ U)~~.,., u,, .7 )& -7..~~~~~~~~~~~~~~~~~~~~~~~~~~~ S O 'ttN S\ �l ~ ,i,:iA N 0 0; - -\ HZ~ 1 -- ~� J�~ * �z -2 'S -r~~1* -- -..YIX EWL ..........., S~~~~~~~~~AN O~~~f~~A~~ .~~~p~~�t S NORTHWEST FLORIDA I~~~~~a 30*~ --- WATER MANAGEMENTDSRC I~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ EXPLANATION 3 *- PROPOSED WELL LOCATION~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ROOEDWLLLCATO *- EXISTING WELL LOCATION 24 - WELL NUMBER. REFER TO TABLE 6 FIGURE 10 PROPOSED MONITOR WELL LOCATIObS 8.7 , SS " E~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~B ~ n~db I*, I~~~I:a�ai'" I~~~~~~~~~~~~~~~~~~~~~~~~���"~ Gulf County The construction of eight new wells is proposed for coastal Gulf County, along with the use of an existing Ambient Ground-Water Monitoring Program well at Port St. Joe. The eight wells are proposed to provide basic I ~~hydrogeologic data and to investigate the high fluoride and sodium concentrations found along the coast and the high chloride concentrations found inland along the Apalachicola River. The Cape San Blas area, with three proposed monitor wells, is of especial interest because of a recent increase in the amount of pumpage from the Floridan Aquifer. totalof 1 wels is Bay County A toa f1 el sproposed to investigate and monitor saltwater movement in coastal Bay County. Two wells, a shallow well and a deep well, are proposed for the Mexico Beach area to investigate whether elevated fluoride concentrations vary with depth. Three wells are proposed for Tyndall Air Force Base to investigate elevated chloride levels associated with past I ~~large withdrawals and to examine the extent of the high fluoride concentrations in the Mexico Beach area. Additional wells are recommended for St. Andrews State Park, Point Royale, West Panama City Beach and Camp Helen. A pair of wells, one shallow and one deep, is recommended for the Panama City Beach area to investigate the apparent zonation of transmissivity and the I ~~increase in chloride concentrations with depth. Two wells are proposed inland from the gulf shore, to monitor potential saltwater movement in the deeply embayed Panama City area. The use of an existing well recently constructed in I ~~~~~~~~~~~~~~59 Panama City for the Ambient Ground-Water Monitoring Network is recommended, as well as construction of a monitoring well in the Southport area, where large amounts of water are pumped from the Floridan Aquifer by a power-generating plant. Walton CountyI Nine monitor wells are proposed for Walton County. Five of the wells,3 including four existing wells, are proposed to monitor the saline water in the Choctawhatchee Bay area, with one of the five wells located north of Choctawhatchee Bay to monitor the area of saltwater there. Placement of a monitor well is proposed for the area between the main body of the salt waterU and the South Walton Utility wells in order to monitor any movement of the3 salt water in response to the South Walton Utilities pumping. Use of South Walton Utility Well #5, proposed for construction in 1986, is also recommended for the same purpose. One well each is proposed for the Camp Creek/Eastern Lake area and Seagrove Beach.3 Ok-ooa CountyH Eight monitor wells are proposed for coastal Okaloosa County, including the use of the existing NNFWMD Crystal Beach monitoring well. One well is proposed for the Destin area, which is experiencing rapid growth and an increasing use of water from the Floridan Aquifer. Three wells are proposed for the Okaloosa Island area, including a pair of wells, one at approximately the total depth of the nearest supply wells and the other to the top of the Bucatunna Clay confining bed. Three wells are proposed on the mainland to 60 monitor water quality associated with the major cone of depression in the Fort Walton Beach area: one at Shalimar, one in the Mary Esther area and one in the Seashore Village area. Santa Rosa and Escambia Counties 3 ~~~~Seven wells are proposed to monitor the coastal area of Santa Rosa County and to investigate the westward position of the saltwater/freshwater I ~~interface in the Upper Limestone of the Floridan Aquifer. The use of two existing monitor wells, the City of Navarre Beach's East and West monitor wells, is proposed. Construction of a third monitor well is proposed for the 3 ~~Midway area, to monitor potential changes in water quality caused by a projected large increase in the amount of pumpage from the Floridan Aquifer. I ~~A fourth well is proposed for the Eglin Air Force Base property near the Santa Rosa/Okaloosa County line, where data is lacking or contradictory. Three other wells are proposed to explore the western and northern positions of the 3 ~~saltwater interface: one well on Santa Rosa Island in Escambia County, west of Navarre Beach; one well on the mainland, west of Midway; and one well north U ~~of Holley, south of the Yellow River. U ~~~~~~~~Monitor Well Co~nstruction Details Two considerations must be made when designing the construction of a I ~~well to be used for monitoring. First, the well must be adequately designed to sample the portion of the aquifer desired while excluding water from other sources. Wells should be eased to the required depth and the annulus between 61 the casing and the well bore filled with grout to exclude water which mayU otherwise move downward along the casing. The second consideration is ease of sample collection. In order to obtain a representative sample of aquifer water, the well must first be purged of the stagnant water in and around the well. Removal of approximately three well volumes of water to adequately flush the well is recommended before sampling takes place. In a large-I diameter, deep well this may be a large amount of water, the removal of which may require the well to be pumped for several hours before the first sample can be taken. However, because of equipment-size constraints, the well casing3 diameter also cannot be too small, especially in productive areas where a four-~inch diameter or larger pump may be necessary to move the volume of waterI needed to develop and flush the well. A variety of types of monitoring well construction is necessary to adequately monitor the Floridan Aquifer along the length of the Northwest District coast. Proposed monitor well depths range between 100 and over 1000 feet. To facilitate sampling, well diameters of four inches for wells less than 500 feet deep, and well diameters of six inches for wells greater than 500 feet deep are recommended. Recommended casing materials are Schedule 140 or 80 PVC for wells less than 500 feet deep and steel casing for wells greater than 500 f eet deep. Table 7 contains recommended total depths, casing depths and diameters for each monitoring well proposed for construction. Given depths are approximations only, based on existing information for the top of the Floridan Aquifer and on depths and casing depths for surrounding wells. Casing depths are generally set so as to case off the Surficial Aquifer and Intermediate 62 System. Total depths are set either at or slightly below the zone from which public water supply wells in the vicinity of site withdraw their water, at the I ~~base of the Floridan Aquifer, or at depths which data indicate may show changes in water quality or transmissivity. All wells are designed to have open-hole completions. I~~~~~~~~~~~~~~~6 Table 7.-�Construction Specifications for Proposed Monitor Wells. Total Casing Well Map Depth Depth Diameter No. Location (Feet) (Feet) (Inches) Jefferson County 1 Coastal Jefferson County 200 35 4.0 Wakulla County 2 St Marks Wildlife Refuge 200 35 4.0 3 Wakulla Beach, Shallow 75 35 4.0 4 Wakulla Beach, Deep 500 50 6.0 5 Shell Point Area--Onshore 75 35 4.0 6 Shell Point Area-Inland 200 75 4.0 7 Panacea--Shallow 75 50 4.0 8 Panacea--Deep 200 50 4.0 9 Ochlockonee Point 200 50 4.0 Franklin County 10 Lighthouse Point 200 50 4.0 11 St. Teresa 150 50 4.0 12 Lanark Village 200 50 4.0 13 Carrabelle--Shallow 200 100 4.0 14 Carrabell e-Deep 500+ 100 6.0 15 Royal Bluff 200 150 4.0 16* Eastpoint Ambient Well 192 142 4.0 17 St. George Island 500 100+ 6.0 18 Apalachicola--Deep 600 250 6.0 19 Apalachicola--Shallow 400 250 4.0 Gulf County 20 Apalachicola River Basin 500+ 300 6.0 21 Apalachicola River Basin 500+ 300 6.0 22 Apalachicola River Basin 600 250 6.0 23 Eleven Mile 600 350 6.0 24 St. Joe's Spit 700 500 6.0 25 Cape San Blas 700 500 6.0 26 Between McNeil's and 700 400+ 6.0 Port St. Joe 27* Port St. Joe Ambient Well 410 360 4.0 28 Between-Mexico Beach and 500+ 400 6.0 Port St. Joe 64 Table 7.-Construction Specifications for Proposed Monitor Wells. (continued) Total Casing Well Map Depth Depth Diameter No. Location (Feet) (Feet) (Inches) Bay County 29 Mexico Beach-Shallow 500 400 6.0 30 Mexico Beach--Deep 700 400 6.0 31 Tyndall AFB 700 350 6.0 32 Tyndall AFB 700 350 6.0 33 Tyndall AFB 500 300 6.0 34* Panama City Ambient Well 210 160 4.0 35 Southport 400 100+ 4.0 36 St. Andrews State Park 500 300 6.0 37 Point Royale 600 300 6.0 38 Panama City Beach--Shallow 450 300 4;0 39 Panama City Beach-Deep 600 300 6.0 40 West Panama City Beach 600 300 6.0 41 Camp Helen Area 600 250 6.0 Walton County 42 Camp Creek/Eastern Lake Area 600 250 6.0 43 Seagrove Beach 600 250 6.0 44* NWFWMD Pt. Washington 610 295 6.0 45 North of Choctawhatchee Bay 400 150 4.0 46 Blue Mountain Beach Area 500 300 6.0 47* W. A. Holley 354 162 3.0 48* West Hewett 707 277 4.0 49 Between S. Walton Utilities 550 350 6.0 and Salt Water to East 50* S. Walton Utilities #5 650 450 16.0 Okaloosa County 51* NWFWMD Crystal Beach 725 395 6.0 52 Destin Area 750 450 6.0 53 Okaloosa Island Area--Deep 850+ 500 6.0 54 Okaloosa Island Area--Shallow 700 500 6.0 55 Well in Vicinity of 900 550 6.0 Okaloosa County ISL-6 56 Near Seashore Village #1 900 550 6.0 57 Mary Esther 900 500 6.0 58 Shalimar 800 400 6.0 65 Table 7.-Construction Specifications for Proposed Monitor Wells. (continued) _ Total Casing Well Map Depth Depth Diameter No. Location (Feet) (Feet) (Inches) Santa Rosa County 59 Eglin AFB on Santa Rosa 1100 700 6.0 Island, Santa Rosa County 60* Navarre Beach, East Obs 940 730 6.0 61* Navarre Beach, West Obs 1020 840 6.0 62 Midway Area 1200 750 6.0 63 West of Navarre Beach 1200 750 6.0 64 West of Midway 1200 850 6.0 65 Between Holley and the 1200 700 6.0 Yellow River * Existing well proposed for inclusion in monitoring network. ** Depths given are approximations only. Actual casing depth and total depth will be determined by the on-site geologist, based on such factors as lithology, water quality and water-bearing capacity. 66 Water Quality Parameters This monitoring network is designed as a long-term network, to be I ~~sampled at set intervals over a number of years. In long-~term networks, the major expense has been found to be the total cost of the sampling and analysis over a several-year period rather than the initial construction of the wells. The following recommendations are made to maximize the amount of data that can be collected from the proposed system in a cost efficient manner. I ~~~~After the proposed wells are constructed, an initial sampling should be made of each of the network wells and of selected existing wells of known construction. Wells should be sampled by methods described in EPA SW-'611 (U. S. Environmental Protection Agency, 1977) or an equivalent reference. In addition, water samples should be taken from selected depths in all wells in I ~~the network using a sampler designed to take ground-'water samples at specified depths. It is recommended that these samples be analyzed for the parameters shown in Table 8. This full suite of parameters is recommended to provide current information on water quality along the coast and to allow identification of areas with saltwater intrusion or other water quality problems. The information generated by the first sampling should then be analyzed I ~~and used to determine which monitor wells in which locations along the coast provide the most information. For instance, along coastal Wakulla, Jefferson and Franklin counties, a fairly high density of monitoring locations is proposed to provide data where none now exists. If, because of limited use of ground water and because of current good water quality, saltwater intrusion is 67 shown to be unlikely, a lower density network of monitoring wells may actually be needed to monitor saltwater movement. If additional problems are identified, it may be necessary to construct additional monitor wells to better monitor problem locations. Table 8.--RecommendedParameters forFirst Network Sampling. Parameter ~~~~~~~Units Laboratory Parameters Dissolved Solids (Residue at 1800 C) Milligrams Per Liter Dissolved Sulfate (SO 4 Milligrams Per Liter D~~~~~~~~~~~~~isovdClrd C)MlirmPeLie Dissolved Shodium (Cl) Milligrams Per Liter Dissolved Flordeu (Na) Milligrams Per Liter Hardness (Ca, Mg) Milligrams Per Liter Bicarbonate MHO 3 Milligrams Per LiterI Disove aliu Ca Mligam erLie Dissolved Magneium (Mg) Milligrams Per Liter Dissolved Ironesu (Fe) Milligrams Per LiterI Dissolved Irotas u (Fe) Milligrams Per Liter Field ParametersI Temperature (C1) Degrees Centigrade Specific Conductance ~imhos/cm at 250CI pH pH Units Wells chosen for the final network should be monitored at least yearly for a suite of indicator parameters. These parameters will show general changes in water quality and provide information on saltwater movement. 68 Recommended parameters include chlorides, sodium and total dissolved solids, with field measurements of temperature, pH and conductivity (See Table 9). Table 9.-Recommended Parameters for Long-Term Network Sampling. Parameter Units Laboratory Parameters Dissolved Chloride (Cl) Milligrams Per Liter Dissolved Sodium (Na) Milligrams Per Liter Dissolved Fluoride (F) Milligrams Per Liter Total Dissolved Solids (TDS) Milligrams Per Liter Field Parameters Temperature (C�) Degrees Centigrade Specific Conductance iamhos/cm at 25�C pH pH Units 69 SUMMARY AND CONCLUSIONS Although up to four major water-bearing units may be present at any I ~~given location along the coast, this study concentrated on designing a monitoring system for the Floridan Aquifer. The Floridan Aquifer is the major source of ground-water supply in most of the coastal area. The only coastal county that was not represented in this study was Escambia County, where the shallower Sand~-and-Gravel Aquifer is used as the primary source of water. I ~~~In general, ground-water pumpage in the Northwest District is concentrated in urban areas and along those portions of the coastline which have been extensively developed. Water-level declines have resulted from large ground-water withdrawals in the Fort Walton Beach area, where a regional cone of depression with maximum declines of greater than 2~40 feet has formed. I ~~Panama City and Port St. Joe are areas where cones of depression have developed in the recent past, but in both cases, conditions returned to normal after surface water sources were developed as An alternative water supply. A large amount of chemical and hydrologic variability occurs in the Floridan Aquifer from east to west along the Northwest District's coast. The I ~~top of the Floridan Aquifer is at or near land surface in Jefferson and Wakulla counties and dips to 700 feet below mean sea level in Santa Rosa County. Transmissivities also varied widely along the coast, with higher transmissivities found in Wakulla and eastern Franklin counties, low transmissivities through the mid portion of the Apalachicola Embayment area, and higher transmissivities for the areas of Panama City Beach, the Des tin I ~~~~~~~~~~~~~~~~~71 area and Navarre Beach. Limited information indicates an increase in permeability with depth. Water quality in the Floridan Aquifer varies widely due to both natural and man-made factors. In general, the water in the Floridan becomes increasingly saline toward the west, as the aquifer dips more deeply below the land surface. Localized areas of poorer quality water are found in the Choctawhatchee Bay area in southern Okaloosa and Walton counties, in the stretch of coast between Mexico Beach in Bay County and Cape San Blas in Gulf County, along the Apalachicola River in Franklin and Gulf counties and in the Spring Creek area of Wakulla County. Areas where saltwater contamination has occurred because of ground-water withdrawals include the Panacea area inI Wakulla County, Panama City Beach and Tyndall Air Force Base in coastal Bay County and the Fort Walton Beach and Destin area in Okaloosa County, which appears to show a low-level increase in chloride concentration when compared to surrounding areas. Analysis of data gathered during this study indicates that there is aI need for a ground-water monitoring network in the coastal areas of the Northwest District. There are four types of areas along the Northwest District coast where monitoring is needed: 1) areas of little or no data; 2) areas where poor quality water is present in the Floridan Aquifer, either because of natural or man-induced factors; 3) areas showing large amounts ofI drawdown; and 4) areas where rapid development is occurring and placing an increased demand on water resources. A total of 65 monitor wells is proposed for the coastal ground-water monitoring network: 56 wells to be constructed for this project and nine 72 H ~~exkisting monitor wells that are ideally located and of known construction. Proposed monitor well depths range between 75 feet and 1200 feet and at least one monitor well is proposed for each coastal county. A two-'step sampling program is proposed, with an initial comprehensive analysis of several water quality parameters, to be followed with a long-~term sampling and analysis I ~~program utilizing a limited number of indicator parameters. I~~~~~~~~~~~~~~~7 REFERENCES Barr, Douglas E., Larry R. Hayes, and Thomas Kwader, 1985, Hydrology of the Southern Parts of Okaloosa and Walton Counties, with Special Emphasis on the Upper Limestone of the Floridan Aquifer, U. S. Geological Survey Water Resources Investigations Report 84-4305. Barr, Douglas E. and Jeffry R. Wagner, 1981, Reconnaissance of the Ground Water Resources of Southwestern Bay County, Northwest Florida Water Management District Technical File Report 81-8. Barr, Douglas E., Agustin Maristany and Thomas Kwader, 1981, Water Resources of Southern Okaloosa and Walton Counties, Northwest Florida, Northwest Florida Water Management District Water Resources Investigation 81-1. Chen, Chih Shan, 1965, The Regional Lithostratigraphic Analysis of Paleocene and Eocene Rocks of Florida, Florida Bureau of Geology Bulletin No. 45, 105 p. Clark, Murlene Wiggs and Walter Schmidt, 1982, Shallow Stratigraphy of Okaloosa County and Vicinity, Florida Bureau of Geology Report of Investigations No. 92. Coffin, John E., 1982, Summary of Groundwater and Surface Water Data for City of Pensacola and Escambia County, Florida, U. S. Geological Survey Open File Report 82-361. Cole, W. Storrs, 1945, Stratigraphic and Paleontologic Studies of Wells in Florida, Florida Bureau of Geology Bulletin No. 28, 160 p. Foster, James B., 1972, Guide to Users of Groundwater in Bay County, Florida, Florida Bureau of Geology Map Series No. 46. Hayes, Larry R. and Douglas E. Barr, 1983, Hydrology of the Sand-and-Gravel Aquifer, Southern Okaloosa and Walton Counties, U. S. Geological Survey, Water Resources Investigations Report 82-4110. Kranzer, Bonnie S., 1983, Water Use in the Northwest Florida Water Management District, Northwest Florida Water Management District Special Report 83-8. Kwader, Thomas and Walter Schmidt, 1978, Top of the Floridan Aquifer in Northwest Florida, Florida Bureau of Geology Map Series No. 86. Marsh, Owen T., 1966, Geology of Escambia and Santa Rosa Counties, Western Florida Panhandle, Florida Bureau of Geology Bulletin No. 46, 140 p. 75 REFERENCES (continued) Musgrove, Rufus H., Jack T. Barraclough and Rodney G. Grantham, 1965a, Water Resources of Escambia'and Santa Rosa Counties, Florida, Florida Bureau of Geology Report of Investigations No. 40. Musgrove, Rufus H., J. B. Foster and L. G. Toler, 1965b, Water Resources of the Econfina Creek Basin Area in Northwestern Florida, Florida Bureau of Geology Report of Investigations No. 41. Pascale, Charles A., 1974, Water Resources of Walton County, Florida, Florida Bureau of Geology Report of Investigations No. 76. Pascale, Charles A. and Jeffry R. Wagner, 1982, Water Resources of the Ochlockonee River Area, Northwest Florida, U. S. Geological Survey Open File Report 81-1121. Pratt, Thomas R. and Douglas E. Barr, 1982, Availability and Quality of Water from the Sand-and-Gravel Aquifer in Southern Santa Rosa County, Florida, Northwest Florida Water Management District Water Resources Special Report No. 82-1. Puri, Harbans S., 1954, Contribution to the Study of the Miocene of the Florida Panhandle, Florida Bureau of Geology Bulletin No. 36, 345 p. Schmidt, Walter, 1983, Neogene Stratigraphy and Geologic History Apalachicola Embayment, Florida, Unpublished Dissertation, Florida State University, Department of Geology. Schmidt, Walter and Murlene Wiggs Clark, 1980, Geology of Bay County, Florida, Florida Bureau of Geology Bulletin No. 57, 96 p. Trapp, Henry Jr., 1977, Exploratory Water Well, St. George Island, Florida, U. S. Geological Survey Open File Report 77-652.' Trapp, Henry Jr., 1975, Hydrology of the Sand-and-Gravel Aquifer in Central and Southern Escambia County, Florida, Preliminary Report~-November, 1973. U. S. Geological Survey Open File Report FL-74027. Trapp, Henry Jr., 1972, Availability of Ground Water for Public Supply in the Pensacola Area, Florida, U. S. Geological Survey Open File Report 72002. Trapp, Henry Jr., C. A. Pascale and J. B. Foster, 1977, Water Resources of Okaloosa County and Adjacent Areas, Florida, U. S. Geological Survey Water Resources Investigations 77-9. U. S. Environmental Protection Agency, 1977, Procedures Manual of Ground Water Monitoring at Solid Waste Disposal Facilities, EPA/530/SW-611. 76 REFERENCES - (continued) Wagner, Jeffry R., 1986, December 15, 1985, Written Communication, Northwest Florida Water Management District. Wagner, Jeffry R., Thomas W. Allen, Linda Ann Clemens and James B. Dalton, 1985, Ambient Groundwater Monitoring Program~--Phase 1: Northwest Florida Water Management District, DER Contract No. WM65. Wagner, Jeffry R., Elizabeth A. Hodecker and Robert Murphy, 1980a, Evaluation of Industrial Water Availability for Selected Areas of the Northwest Florida Water Management District, Northwest Florida Water Management District Water Resources Assessment No. 80-1. Wagner, Jeffry R., Charles Lewis, Larry R. Hayes and Douglas E. Barr, 1980b, Hydrologic Data for Okaloosa, Walton and Southeastern Santa Rosa Counties, Florida, U. S. Geological Survey Open File Report 80-741. Walton, William C., 1970, Ground Water Resource Evaluation, McGraw-Hill Book Company, U. S. A. Yon, J. William, 1966, Geology of Jefferson County, Florida, Florida Bureau of Geology Bulletin No. 48, 115 p. 77 ~~~~~~~~~~~APNICE ~~~~~Apnix :Slce el nteCatlAeso h ~~~~~~~~~otws istit Appendix A: Majorecter Usells in teCoastal Areas of' the Northwest District. ApenixB:MaorWte Uer i Cata Aea o'9h APPENDIX A: Selected Wells in the Coastal Areas of the Northwest District COUNTY: SANTA ROSA Map Total Casing # Well Name I.D. Number Depth Depth Altitude 1 West Observation Well 302224086543801 1020 840 10 2 Navarre Beach #1 302244086525201 950 810 7 3 Navarre Beach #2 302259086515701 1051 782 7 4 Navarre Beach #3 302220086530701 1030 925 8 5 East Observation Well 302257086511501 940 730 5 6 Eglin AFB A-15 302329086480901 1088 708 13 COUNTY: OKALOOSA Map Total Casing # Well Name I.D. Number Depth Depth Altitude 7 Eglin AFB A13 302334086444001 835 654 15 8 Eglin AFB A-11 302342086424801 794 640 8 9 Eglin AFB A-10 302357086415101 822 580 12 10 Eglin AFB A-7 312348086390001 738 538 12 11 Eglin AFB A-6 302351086382901 868 623 12 12 Ok. Isl. Authority #4 302347086360401 736 545 10 13 Ok. Isl. Authority #3 322352086375701 867 528 7 14 Ok. Isl. Authority #2 302346086352401 845 455 5 15 WaysidePark #1 302338086352601 684 462 12 16 Eglin AFB A-3 302334086332901 735 505 15 17 Mrs. Kelly Sims 302347086304201 628 419 15 18 Destin #1 302340086294201 632 415 25 19 Aegean Condo 302303086294501 600 457 5 20 Destin #3 302331086284601 731 450 25 21 Destin #2 302321086275201 634 432 28 22 Destin #4 302409086291101 731 442 15 23 Crystal Beach 302259086253401 710 380 37 COUNTY: WALTON Map Total Casing #_ Well Name I.D. Number Depth Depth Altitude 24 South Walton #3 302258086250301 554 410 18 25 South Walton #1 3022390862133401 662 458 21 26 South Walton #2 302249086203501 595 395 5 27 South Walton #4 302258086225301 554 410 18 28 DNR Cofeen #1 302224086192201 481 - 20 29 West Hewett 3022240861 71 701 697 532 1 i 30 Don Bishop 302231086154501 365 270 15 31 Dune I 302112086151401 443 321 15 32 St. Rita Catholic Church 302225086141801 333 253 17 33 Sea Bluff 302027086122201 403 283 27 34 Forest Dunes 302025086101101 532 332 21 35 J.A Holley 302231086153201 533 253 12 36 W.L. Mundy 302247086091301 370 215 5 37 USGS Causeway 302357086100701 332 --I 38 James Kistenson 3023570861211401 322 170 39 Mathews 302442086130701 325 160 5 40 W.A. Holley 3023114086103401 349 157 5 41 Seagrove Beach #3 301885086065501 448 238 22 42 Camp Creek Subdivision 301733086032001 590 246 20 43 Inlet Beach #1 301637086000201 427 94 28 44 Inlet Beach #2 302645086003001 578 231 32 COUNTY: BAY Map Total Casing _~#_ Well Name I.D. Number Depth Depth Altitude 45 Camp Helen 301 626085592501 460 - 22 46 Panama City Beach #1 301350085532201 724 304 38 47 Panama City Beach #10 301 21 8085493701 699 412 10 48 Panama City Beach #9 301354085524201 759 393 10 49 Panama City Beach #6 301 31 6085520401 698 337 10 50 Panama City Beach #5 ----- ----- 864 348 10 51 Panama City Beach #7 3010046085483501 434 292 10 52 Panama City Beach #8 301041085481701 450 286 8 82 53 US Navy Mine Def. Lab #1 301025085451901 594 246 10 54 US Navy Mine Def. Lab #2 301019085451901 595 250 10 55 US Navy Mine Def Lab #3 301030085452001 473 250 10 56 Point Royal 300923085445901 525 284 10 57 St. Andrews State Park 300726085441901 384 293 15 58 St. Andrews State Park 300807085440401 380 -- 10 59 Tyndall AFB Golf Course 300630085401701 500 324 16 60 Tyndall AFB #6 300453085362101 644 351 31 61 Tyndall AFB #2 300404085351701 653 339 26 62 Tyndall AFB #7 300347085345501 645 345 28 63 Tyndall AFB #3 300358085353901 661 356 24 64 Tyndall AFB #4 300407085355501 435 356 24 65 Tyndall AFB D-2 well 295804085282501 640 - 21 66 Mexico Beach #1 295645085243901 485 412 12 67 Mexico Beach #2 295645085243001 590 190 10 COUNTY: GULF Map Total Casing # Well Name I.D. Number Depth Depth Altitude 68 Port St. Joe #1 294933085180301 653 389 12 69 Port St. Joe #3 294936085175001 656 420 12 70 Lighthouse Util. #1 294120085182701 577 363 3 71 Lighthouse Util. #2 623 422 8 72 St. Joe Spit Test ' 294253085425301 155 137 16 73 USAF #33 (Eglin AFB) 293958095211801 588 480 7 74 USAF D-3 (Eglin AFB) #1 294032085204501 644 594 10 75 USAF D-3 (Eglin AFB) #2 294042085204301 590 10 76 M K Ranch-shop 295650085052201 488 366 12 77 M K Ranch-irrigation 293712085050201 585 233 26 COUNTY: FRANKLIN Map Total Casing # Well Name I.D. Number Depth Depth Altitude 78 Apalachicola #1 294327084585501 . -- -. 79 Apalachicola #2 294350084593101 394 303 15 80 Apalachicola #4 294346084593001 465 330 83 81 Bobby Kirvin 294400084593601 376 285 4 82 McCulloch #1 294339084432401 266 158 7 83 McCulloch #1A 294322084531601 246 163 4 84 McCulloch #3A 294342084531601 404 337 9 85 Leisure Properties #1 294405084531501 263 170 86 Alan Hubanks 295055084410301 96 90 7 87 J.F. Kilborn 295046084394301 87 59 5 88 J.C. Rosenau 295150084405201 57 -- 8 89 St. Joe Paper 295507084311901 166 72 30 90 Emily Kemp 295536084275301 109 96 91 Alligator Point #1 295302084223501 130 2 28 COUNTY: WAKULLA Map Total Casing # Well Name I.D. Number Depth Depth Altitude 92 Georges Motel 295840084225801 132 66 14 93 Town of Panacea 295845084230501 57 40 11 94 Panacea #2 295845084230501 79 42 11 95 Panacea #4 300151084235801 113 78 12 96 Wildlife Refuge test 300148084242801 108 39 14 97 TEC Gulf Coast #1 300618084193801 191 117 14 98 TEC Gulf Coast #2 300618084193801 189 62 14 99 TEC Shell Point #1 300500084182701 178 31 10 100 TEC Shell Point #2 300500084182501 109 96 10 101 Lester Lewis 300540084174001 74 26 9 102 Jerry Wells 300343084171001 48 26 5 103 St. Marks Refuge Hdqrs 300516084094801 54 34 11 84 APPENDIX B: Major Water Users in Coastal Areas of the Northwest District. COUNTY: BAY Owner/Address Location Avg. Use/Max. Use Area Well Lat/Long Quadrangle Aquifer U.S. Department of the Navy A 1 30.11.10/85.08.02 Panama City Floridan Naval Coastal Systems Center Beach Panama City, FL 32404 0.100 Mgal/d/ 0.201 Mgal/d Bay Pointe Yacht and Country A 1 30.08.45/85.44.45 Panama City Floridan Club 100 Delwood Beach Road Panama City Beach, FL 32407 0.100 Mgal/d/ 0.214 Mgal/d Town of Mexico Beach B 1 29.56.45/85.24.39 Beacon Hill Floridan P.O. Box 13425 2 29.56.39/85.24.36 Beacon Hill Mexico Beach, FL 32410 0.300 Mgal/d/ 0.665 Mgal/d City of Lynn Haven A 1 30.14.29/85.38.53 Panama City Floridan 825 Ohio Avenue 3 30.14.47/85.38.53 Panama City Lynn Haven, FL 32444 4 30.14.14/85.38.58 Panama City 5 no data Panama City 0.880 Mgal/d (est.) SCCCCCCCCCCCCCCCCCCCCC55CCC~CC5CC'C5CC46C5CCCCCCCCCCC.4555CoCCGCCCCCC5CCCCCNCCCsCCCC Lansing Smith Electric B 1 30.15.58/85.15.58 Southport Floridan Generating Plant 2 30.15.58/85.15.58 Southport P.O.Box BG 3 30.15.58/85.15.58 Southport Lynn Haven, FL 32401 0.700 Mgal/d/ 2.900 Mgal/d 85 COUNTY: FRANKLIN Owner/Address Location Avg. Use/Max. Use Area Well Lat/Long Quadrangle Aquifer Alligator Point Water A 1 29.56.05/84.22.05 Lighthouse Pt Floridan Resources District 2 29.56.05/84.22.05 Lighthouse Pt P.O. Box 155 3 29.53.35/84.22.50 Lighthouse Pt Panacea, FL 32346 4 29.53.35/84.22.50 St Teresa 5 29.53.35/84.22.50 St Teresa 0.120 Mgal/d/ 0.417 Mgal/d City of Carrabelle B 1 29.50.59/84.39.47 Carrabelle Floridan P.O. Drawer 569 2 29.50.59/84.39.47 Carrabelle Carrabelle, FL 32322 0.300 Mgal/d/ 0.631 Mgal/d Lanark Village Water and B 1 29.53.27/84.34.53 McIntyre Floridan Sewer District 2 29.53.27/84.34.53 McIntyre P.O. Box 710 Lanark Village, FL 32323 0.200 Mgal/d/ 0.400 Mgal/d St. George Island Utilities B 1 29.44.05/84.53.15 Apalachicola Floridan P.O. Box 430 2 29.44.11/84.53.11 Apalachicola Apalachicola, FL 32320 0.403 Mgal/d/ 1.086 Mgal/d COUNTY: GULF Owner/Address Location Avg. Use/Max. Use Area Well Lat/Long Quadrangle Aquifer City of Port St. Joe B 1 29.49.33/85.17.53 Port St. Joe Floridan P.O. Box D-A 2 29.49.33/85.17.53 Port St. Joe Port St. Joe, FL 32456 3 29.49.33/85.17.53 Port St. Joe Surf 4 29.49.33/85.17.53 Port St. Joe 0.867 Mgal/d/ 1.300 Mgal/d 86 COUNTY: OKALOOSA Owner/Address Location Avg. Use/Max. TJse Area Well Lat/Long Quadrangle Aquifer Destin Water Users A 1 30.23.56/86.29.46 Destin Floridan P.O. Box 308 2 30.23.21/86.27.55 Destin Destin, FL 32541 3 30.23.32/86.28.50 Destin 4 30.24.10/86.29.13 Destin 2.440 Mgal/d/ 6.552 Mgal/d 5 30.24.02/86.31.17 Destin City of Niceville B 1 30.31.42/86.29.18 Niceville Floridan 208 N. Partin Drive 2 30.31.11/86.28.42 Niceville Niceville, FL 32578 3 30.31.22/86.27.58 Niceville 4 30.32.03/86.30.04 Niceville 2.152 Mgal/d/ 3.228 Mgal/d 5 30.32.02/86.28.39 Niceville 6 30.31.16/86.26.35 Niceville Okaloosa County Water and OC-1 30.28.04/86.35.10 Ft Walton Bch Floridan Sewer System OC-2 30.28.04/86.35.14 Ft Walton Bch 10 First Avenue OC-3 30.36.30/86.36.52 Ft Walton Bch Fort Walton Beach, FL 32548 OC-4 30.26.31/86.37.48 Mary Esther OC-5 30.36.25/86.34.20 Ft Walton Bch 4.940 Mgal/d/ 7.770 Mgal/d oc-6 30.26.35/86.38.29 Mary Esther OC-8 30.27.20/86.38.29 Mary Esther ISL-1 30.23.45/86.35.14 Ft Walton Bch ISL-2 30.23.45/86.35.22 Ft Walton Bch ISL-3 30.23.46/86.35.28 Ft Walton Bch ISL-4 30.23.50/86.35.57 Ft Walton Bch ISL-6 30.23.59/86.37.20 Mary Esther Seashore Village Water B 1 30.24.40/86.43.45 Mary Esther Floridan System, Inc. 2 30.24.42/86.47.10 Navarre P.O. Box 868 3 30.24.52/86.45.39 Navarre Mary Esther, FL 32569 0.392 Mgal/d/ 0.980 Mgal/d City of Valparaiso B 1 30.30.35/86.30.05 Valparaiso Floridan P.O. Box 296 2 30.31.04/86.30.29 Niceville Valparaiso, FL 32580 3 30.31.26/86.30.28 Niceville 0.600 Mgal/d/ 0.892 Mgal/d Town of Mary Esther B 1 30.24.40/86.39.47 Mary Esther Floridan 195 Cristobal Road 2 30.24.40/86.39.47 Mary Esther Mary Esther, FL 32569 0.650 Mgal/d/ 1.060 Mgal/d Northgate Development B 1 30.25.32/86.23.52 Mary Esther Floridan Company, Inc. 203 John Simms Parkway Niceville, FL 32578 0.400 Mgal/d/ 6.08 Mgal/d City of Fort Walton Beach B 2 30.25.08/86.36.42 Ft Walton Beach Floridan P.O. Box 4009 3 30.25.11/86.38.21 Ft Walton Beach Fort Walton Beach, FL 32549 5 30.25.05/86.35.55 Ft Walton Beach 6 30.27.30/86.36.48 Ft Walton Beach 4.322 Mgal/d/ 6.515 Mgal/d 7 30.27.06/86.36.48 Ft Walton Beach 8 30.25.13/86.38.40 Mary Esther 9 30.25.18/86.39.10 Mary Esther 10 30.37.35/86.37.17 Mary Esther 11 30.25.21/86.39.59 Mary Esther A 30.27.30/86.36.48 Ft Walton Beach S&G B 30.27.30/86.36.48 Ft Walton Beach C 30.37.35/86.37.17 Mary Esther D no data E no data Eglin Air Force Base C 1 30.29.17/86.29.54 Destin Floridan Okaloosa County, FL 32542 2 30.29.09/86.30.13 Ft Walton Bch 3 30.29.03/86.30.32 Ft Walton Bch 4.410 Mgal/d/ 9.078 Mgal/d 4 30.29.00/86.30.12 Ft Walton Bch 5 30.28.29/86.29.51 Destin 6 30.29.03/86.30.17 Ft Walton Bch 7 30.28.09/86.32.37 Ft Walton Bch 8 30.27.20/86.32.20 Ft Walton Bch 9 30.28.01/86.32.06 Ft Walton Bch 10 30.27.43/86.33.01 Ft Walton Bch 11 30.27.02/86.32.16 Ft Walton Bch 12 30.28.49/86.30.09 Ft Walton Bch 13 30.27.19/86.32.38 Ft Walton Bch 14 30.28.01/86.32.49 Ft Walton Bch 15 30.28.42/86.33;19 Ft Walton Bch 16 30.27.26/86.33.43 Ft Walton Bch 88 COUNTY: SANTA ROSA Owner/Address Location Avg. Use/Max. Use Area Well Lat/Long Quadrangle Aquifer Pace Water System B 1 30.36.06/87.09.33 Pace S&G P.O. Box 1049 2 30.36.41/87.08.30 Pace Pace, FL 32570 3 30.36.15/87.06.51 Milton South 4 30.34.16/86.06.00 Pace 1.700 Mgal/d/ 3.300 Mgal/d 5 30.36.51/87.06.46 Milton South Midway Water System B 1 30.24.17/86.52.15 Navarre Floridan P.O. Box 70 2 30.25.55/86.54.08 Holley Gulf Breeze, FL 32561 3.000 Mgal/d/ 3.344 Mgal/d Santa Rosa Shores Utilities A 3 30.23.00/87.05.11 Garcon Point S&G P.O. Box 400 4 30.22.57/87.05.11 Garcon Point Gulf Breeze, FL 32561 5 30.23.00/87.05.17 Garcon Point 0.400 Mgal/d/ 0.700 Mgal/d Holley-Navarre Water System 1 30.25.50/86.51.45 Holley Floridan P.O. Box 837 2 30.26.50/86.52.00 Holley Gulf Breeze, FL 32561 1.500 Mgal/d/ 2.304 Mgal/d Air Products and Chemicals 1 30.35.26/87.07.48 Pace S&G P.O. Box 467 2 30.35.24/87.08.05 Pace Pensacola, FL 32592 3 30.34.46/87.08.20 Pace 5 30.35.28/87.07.33 Pace 4.320 Mgal/d/ 7.200 Mgal/d 6 30.35.26/87.08.22 Pace American Cyanamid Company B 2 30.34.20/87.07.18 Milton South S&G 1801 Cyanamid Road 3 30.34.07/87.07.05 Milton South Milton, FL 32570 4 30.34.04/87.06.50 Milton South 5 30.34.06/87.06.28 Milton South 4.845 Mgal/d/ 6.970 Mgal/d 6 30.34.35/87.06.50 Milton South 89 Santa Rosa Board of A 1 30.22.15/86.52.45 Holley Floridan Commissioners 2 30.22.54/86.52.13 Navarre Navarre Beach Utility System 3 30.22.20/86.53.07 Holley 0.400 Mgal/d/ 0.800 Mgal/d COUNTY: WAKULLA Owner/Address Location Avg. Use/Max. Use Area Well Lat/Long Quadrangle Aquifer Talquin Electric Cooperative B 51 30.06.08/84.17.30 Spring Creek Floridan Gulf Coast System 52 30.06.08/84.17.30 Spring Creek P.O. Box 191 Quincy, FL 32351 0.247 Mgal/d/ 0.460 Mgal/d Panacea Area Water System A 2 29.58.45/84.23.05 St Teresa Floridan P.O. Box 215 3 30.01.47/84.24.15 St Teresa Panacea, FL 4 30.01.51/84.23.50 St Teresa 5 30.01.48/84.24.28 St Teresa 0.130 Mgal/d (est.) 11�---4------1------~--�~ -----�-~---------- -------I--------;---- - - - -- - - - - - - - - - - -- - - - ----- - - - ***************************************** **************************************** COUNTY: WALTON Owner/Address Location Avg. Use/Max. Use Area Well Lat/Long Quadrangle Aquifer South Walton Utility A 1 30.22.42/86.21.04 Choctaw Bch Floridan Company, Inc. 2 30.22.49/86.20.30 Choctaw Beach Box 355, Star Route 3 30.22.45/86.19.45 Choctaw Beach Destin, FL 32541 4 30.22.41/86.19.42 Miramar Beach 2.150 Mgal/d/3.737 Mgal/d 90 Seascape Resort A 1 30.22.45/86.22.12 Destin Floridan P.O. Box 970 2 30.22.44/86.22.50 Destin Destin, FL 32541 0.500 Mgal/d/ 1.000 Mgal/d John V. Smith Water Company A 1 30.19.04/86.07.37 Grayton Beach Floridan Seagrove Beach Water System 2 30.19.02/86.07.32 Grayton Beach 234 Deer Avenue 3 30.19.00/86.06.56 Pt Washington Niceville, FL 32578 0.120 Mgal/d/ 0.458 Mgal/d Santa Rosa Golf and Beach A 1 30.21.50/86.14.00 Grayton Beach Floridan Club, Inc. 2 30.21.50/86.14.00 Grayton Beach S&G Highway 30A 3 30.21.50/86.14.00 Grayton Beach Santa Rosa Beach, FL 32459 0.148 Mgal/d/ 0.210 Mgal/d City of Freeport B 1 30.29.15/86.07.20 Freeport Floridan P.O. Box 339 Freeport, FL 32439 0.320 Mgal/d/ 0.347 Mgal/d 91