[From the U.S. Government Printing Office, www.gpo.gov]
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                 ASSESSMENT OF BACTERIAL AND NUTRIENT
      CONTAMINATION FROM SUBSURFACE DISPOSAL SYSTEMS IN
                                 THE SEACOAST AREA

                                        A Final Report to

            The New Hampshire Office of State Planning, New Hampshire Coastal Program

                                           Submitted by

     Dr. Stephen H. Jonesl13, Dr. Richard Langanl, Dr. Lawrence Branaka2, Mr. Daniel Marquisl,3
                                    and Dr. Thomas Ballestero2

     1. Jackson Estuarine Laboratory, University of New Hampshire
    2. Department of Civil Engineering, University of New Hampshire
    3. Department of Natural Resources, University of New Hampshire

                                          July 19, 1995
                                                             U S. DEPARTMENT OF COMMERCE NOAA
                                                             COASTAL SERVICES CENTER
                                                             2234 SOUTH HOBSON AVENUE
                                                             CHARLESTON, SC  29405-2413



    This Report was funded in part by a grant from the Office of State Planning, New Hampshire
    Coastal Program, as authorized by the National Oceanic and Atmospheric Administration (NOAA),
    Grant Award Number NA470Z0237.


                                                         Property of CSc Library




TD-
424. 35                              tE

1995
                                                  NH Coastal Program








                                ACKNOWLEDGEMENTS

       The authors wish to acknowledge the assistance and contributions to the project of Fred
Elkind and David Allain of Elkind Environmental Associates for conducting the tidal water site
assessment; Deborah Lamson, Dan Boisvert, Greg Houle and Gaston Gingives for providing
assistance in field work; Michael Bentley, Tanya Ellsworth, Donna Thomas and Jessica Weir for
assistance in sample processing; Jaimie Wolf for conducting sample analyses; and Bob Moore,
Seabrook Health Officer, and Russ Bailey, Seabrook Town Manager, for helping with site
selection and arranging access to the sites. Special thanks is due to all the Seabrook homeowners
who participated in the project.









                                      INTRODUCTION

       Coastal areas of New Hampshire and throughout the U.S. are, under increasing pressures
for expanded development and conflicting uses. Many coastal areas have less than suitable
conditions for wide-spread development, especially for adequate subsurface treatment of sewage.
Unfortunately, many areas have been developed with residential and commercial buildings and
accompanying septic systems located on poorly suited soils. One result has been contamination of
groundwater and surface water. In surface waters, microbial contamination poses a public health
threat to shellfish consumers and swimmers, while nutrient contaminants threaten critical ecological
processes of estuarine and marine habitats.
       The most critical of these problems at present in coastal New Hampshire is the microbial
pollution, which causes shellfish beds to be closed to prevent public health problems. A great deal
of pressure on the State of New Hampshire by citizens in coastal areas has recently resulted in
increased attention on re-opening closed shellfish areas. Portions of Hampton Harbor are now
conditionally approved, and it is hoped that more areas in the harbor will be opened when the
municipal sewage treatment system is complete, and the suspected sources of contaminants,
private sewage disposal areas, are no longer functional.
       The goal of this study was to take advantage of the situation in Seabrook, where all homes
will be hooked up to the municipal treatment system, and study the linkage between on-site sewage
disposal systems and surface water contamination. Sites near surface waters were to be, studied to
determine if groundwater contaminated with either nutrients or bacteria was moving away from
effluent disposal areas toward surface waters.

                               PROCEDURES AND RESULTS

SITE SELECTION PROCESS
       The process by which study sites were chosen was dominated by the need to find
knowledgeable people willing to participate. Attempts were made to find sites with properties
characteristic of a range of conditions, and all sites had to be near to surface waters. The
perimeters of areas in Seabrook that were close to tidal waters or freshwater tributaries are
encircled in Figure 1. This map was given to the Seabrook Health Officer who then contacted
people who may be likely candidates in these areas. Seventeen different lots were identified as
potential study sites, and thirteen were chosen for study. Two of the sites were assessed only for
implementation of the tidal water assessment forms by Elikind Environmental Associates, Inc.
(1994), while at the remaining eleven sites, groundwater wells were installed.
       The eleven sites chosen for wellwater assessments are identified on Figure I as small
circles around the dwelling at the study sites, and labeled using a 2-3 capital letter designation, as
described in Table 1. Each owner was interviewed in person and given time to consider
participating before signing an access agreement form.










SOILS AND SITE CHARACTERISTICS

        The selected sites were located in two general areas: on River St. bordering Hampton
Harbor and marshes, and in town at various locations. All selected sites were subject to a
thorough assessment that included Order One soils surveys, location and description of septic
systemleffluent disposal area, and other important site characteristics (Elkind Environmental
Assoc., 1994). This preliminary study provided extremely useful information for the ensuing
wellwater assessment studies. Generally, the soils are glacial outwash sands and gravels that
cover bedrock that is near the surface in many areas. The areas near tidal waters have an organic
surface layer overlying sands and gravels. Sites in town are generally on natural soils (except the
Walton Rd. site) while the River St. sites are built on filled wetlands/tidal marshes. The soils and
characteristics of selected study sites are summarized in Table 2, with a more detailed description
of on-site soil properties in Table 3.
       Most of the sites had effluent disposal areas (EDAs) located on filled or excavated soils
(10OA, 299A, 300A), which are not formally classified for soil suitability. However, soils at all
sites have severe limitations for septic systems (groundwater contamination) because of the
prevalence of sandy soils, which are poor filters for, septic system effluent, and the potential for
ponding at poorly drained sites (Tables 2 and 3). One site was adjacent to a freshwater marsh, six
sites were adjacent to salt marshes, and three sites were adjacent to a beach area. Many of the
septic systems were simply cesspools or were so old that they were not state-approved systems.
Only two sites, KDB and RC, had state-approved systems (Table 2). All sites were in relatively
close proximity to the adjacent marsh or beach.

SEAB ROOK WELL INSTALLATIONS AND GROUNDWATER FLOW DIRECTIONS

Well Installations
       The, purpose of the groundwater monitoring wells was to provide the means for obtaining
samples of the groundwater both up gradient and down gradient of the sewage disposal system.
The results of analyses of the samples would be the basis for evaluating the effect of the disposal
system on the local surface water and marshlands.. Monitoring wells were installed at each site up
gradient and down gradient of the effluent disposal area (EDA). The locations of the disposal areas
were obtained from the Elldnd Environmental Associates, Inc. report on the selected Seabrook
properties (Elkind Environmental Associates, Inc., 1994). Typically, between four and six 1/2-in
nominal diameter carbon steel wells were installed at each site. At least one, and more typically,
two wells were installed upgradient of the EDA to establish background levels for bacteria and
nutrients in the groundwater. Then one well was installed in what was estimated to be the down
gradient direction. The directions were estimated based on the direction of the salt marsh, or other
surface waters which might act as a discharge point for the groundwater, and the surface

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topography, since it is not uncommon for local groundwater flow to be influenced by surface
topography. A local groundwater direction was established using the water level elevations from
the first three wells to verify or modify the estimated groundwater directions. Subsequent wells
were installed so that the site had a down gradient well close to the EDA, and also one at a greater
distance down gradient. If there was uncertainty as to the exact groundwater direction, additional
wells were installed in the down gradient direction with the objective to capture the effluent plume,
should it exist.
       Additional wells were required at the KDB sites and the REH/RET sites since the marsh
was adjacent to more than just one side of the site property. The KDB site had two leach fields
situated on what amounted to a small peninsula surrounded by the marsh. Groundwater was
expected to emanate from the leach field in several different directions.
       At both the River Street sites of RH and RC, the well locations were restricted by the
property boundaries and in the case of RC, a buried concrete pad constituting a former parking
area. Since these properties were on opposite sides of the RP property, also participating in the
study, the water levels at all three sites were used to establish well locations.
       The last step in the well installation was to install a well within the EDA (if possible), and a
deep well. The deep well consisted of the same type of well used in the other installations, but
with the screened interval starting at least one foot below the bottom of the screened interval of the
nearest shallow well. As implied, the deep well was installed as a couplet to the closest down
gradient shallow well to the EDA.
       Each well consisted of 1/2-in nominal diameter carbon steel pipe. The pipe came in 11-ft
sections. The well sections had a one-foot section of blank pipe at the well bottom to act as sump
for soil particles. Above the sump was a five-foot length of screen, which consisted of two rows
of two-inch long slots, 0.10 in. wide, cut into opposite sides of the pipe with a laser. The slots
were positioned 1/4-inch apart along the five -foot length and aligned such that the gaps were offset
between the two rows to maintain strength. The remaining length of the 1 1-ft pipe was blank riser.
Prior to installation, a hardened carbon steel drove point was inserted into the sump end of the
well, held in place by a rubber o-ring. If the final depth of the well was to be greater than 11 ft, an
additional blank section of pipe was attached to the well pipe either by threading on a 1/2-inch
coupler in the field, or by welding a sleeve over both sections of pipe with a wire feed arc-welder.
Both methods were used in Seabrook, but the welded sleeve technique proved to be superior. In
two cases, the threads of the coupling did not withstand the vibration of installation.
       The wells were installed using an electric hammer drill (in hammer only mode) powered by
a portable generator. A ten-foot extension ladder was set-up next to the well site, and the well pipe
was positioned next to the ladder. A modified drive point was inserted into the open end of the
well, and provided the anvil for the drill to hammer on. The person installing the well "followed"
the pipe down the ladder until a minimum depth was reached. An electronic water level sounder
was used to check for the water table. If no water was found, the well was vibrated into the sandy
soil further. This process was repeated until the screened section was somewhat centered across
the measured water table. This method was chosen to allow for seasonal water table fluctuations,

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with the objective to keep the water table'within the screened section for as long during the year as
possible. The wells were driven in until at least three feet of the five-foot screens were submerged.
The wells were developed using a 1/2-in. OD. polyethylene tube with a Delrin check valve on the
bottom to create an inertial bailer. Once developed the wells were allowed to come to equilibrium,
and the depth to water was checked to make sure the well was installed to a sufficient depth.
        If the well was in a sensitive area (driveway, yard with small children, or where the owner
wished to mow) the blank riser pipe was cut off approximately two inches above the ground, and
vibrated another 2.5 inches into the ground. A metal cap, six inches long, was tamped over the top
of the well for a flush-mount completion. In non-sensitive areas, the well was completed with
six-to-48 inches of riser pipe above the ground surface, and only a plastic cap was inserted into the
open end of the well. Security of the wells was left to the homeowner.
       A summary of the well completions is shown in Table 4. All wells installed had a 12-in.
sump and a 5-ft screened section. The table includes the depth below ground surface of the well
screen, and the current elevation of the top of the riser (casing). Each well was surveyed relative to
each other during installation to establish relative groundwater elevations. A survey of all sites was
performed on 6/29/95 following the flush mounting of wells at the CSL home and the KDB sites.
The results of this survey are indicated as the current TOC elevations. The FDC site wells were
surveyed into an existing benchmark on a near-by utility pole. Both the CSL and WRH sites were
surveyed based on a benchmark established at the near-by Seabrook elementary school building. It
is suspected this benchmark is a relative (not a geodesic benchmark). All the River Street sites
were surveyed relative to a concrete sewer pumping station manhole cover. The survey will be
adjusted once the geodesic elevation of the cover is known. The KDB site wells were surveyed
relative to each other, assuming KDB-1 as being at elevation 100.00.

Groundwater Flow Directions
       The depth to groundwater was measured during well installation, and again during most of
the sampling events. The water level data was reduced based on the elevation of the top of the well
casing used as a reference for the water depth measurements, and the resulting groundwater
elevation data are summarized in Table 5 separated for each of the respective sites. The data
presented in this table include water levels from the time of installation up through June 29, 1995.
Most of the sites demonstrate a slight lowering of the groundwater table over a period of six
months beginning in January. On sites that are relatively distant from the marsh, the decline in the
groundwater table was gradual over the entire six month period. This can be seen in Table 5 for
the KDB and the FDC sites. The River Street sites show a slight decline in the groundwater levels
in the last month. These sites are essentially surrounded by the marsh on one side and the bay on
the other, and the tidal fluctuations seem to have a mitigating effect on the regional declining
groundwater trend.
       The groundwater elevations presented in Table 5 were plotted on site location maps, and
the piezometric groundwater surface was contoured based on the groundwater elevations at the


                                                4








monitoring wells. The groundwater flow directions cross the contours at right angles, thus the
directions are estimated for each site on the location map (Figures 2-10). ,Maps were prepared for
water levels in the spring(February or March), and for the most recent complete set of readings
(May 31 or June 29).
       It is interesting to note that the groundwater directions between the early spring readings
and the summer data are typically different. In some cases the later data indicate a complete
reversal of the groundwater flow directions. These cases include the REH/RET (Figure 2) RP
(Figure 5), and RH (Figure 4) sites. All of these sites are in close proximity of either the marsh or
the bay, with relatively flat topography. In contrast, the RB (Figure 3) and RC (Figure 6) sites
saw little if any change in groundwater flow directions. Similarly, both the KDB (Figure 9) and
the FDC (Figure 10) sites showed little change in groundwater directions. The FDC site contours
indicated a groundwater mound effect created by the effluent disposal leachfield. The same effect
can be seen in Figure 2 for the RET site.
       The two sites on opposite sides of the same marsh, CSL and WRH both demonstrated a
definitive shift in the groundwater flow directions, but as shown in Figures 7 and 8, respectively,
the change represents an acute angle as opposed to a complete reversal of direction. Both of these
sites have sloping topography with significant relief from the marsh border to the upper end of the
respective property. This relief may be responsible for the smaller effect.
       Since the River Street sites are all clustered together (with the exception of the REH/RET
sites) the water levels can be compared between sites to gain further insight into the groundwater
flow directions. Examining the March 13, 1995 data (Figures 3-6) the groundwater flow direction
indicated is from the marsh toward the bay. There is apparently a conduit of higher hydraulic
conductivity between the RP site and the RC site which share a common boundary. The
groundwater flow directions at the RC site are almost directly toward the RP property. Yet, at the
same time the groundwater flow direction beneath the RP property while still primarily flowing
toward the bay, has a significant direction component toward the RC site.
       During some of the sampling, groundwater was being pumped from the River St. area as
part of the construction associated with installing the new sewer lines. This occurred from
approximately the third week in March, 1995 into the second week in April, 1995 at a constant
rate, and intermittently thereafter into May, 1995. The water was pumped into the harbor through
an 8" water hose, which was apparently full and constantly flowing from March into April. This
activity could have had a significant impact on groundwater flow direction, and could explain the
changes in direction at the RP, RH, REH and RET sites. However, not enough data are available,
especially for April, to confirm that the groundwater pumping caused some of the observed
changes in groundwater flow direction.

SEABROOK SITE ASSESSMENTS

       Wells were sampled for bacterial and nutrient contaminants. Well caps were removed and
depth to water level in wells was measured using a field water level indicator. Sterile polyethylene

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tubing was then inserted into each well to depth of water, and water was removed using a
peristaltic pump. Water was collected for analyses after 3 well volumes were evacuated. Water for
nutrient analyses was collected into an acid-washed one liter bottle, and two samples for
microbiological analyses were collected in sterile one liter bottles. The samples were cooled on ice
and transported to JEL.
        Samples brought back to JEL were processed for the different analyses, and salinities were
recorded using a refractometer. Approximately 500 mls of the nutrient samples were pre-filtered
through 0.45gm pore size filters. The filtrates were frozen until analysis for.ammonium, nitrate
and orthophosphate using a LACHAT autoanalyzer. The filter was dried and weighed to determine
total suspended solids and percent organic matter. Microbiological samples were prefiltered using
a Whatman 41 (20-25 jLm nominal pore size) filter to remove fine suspended sand and silt
particles. A steady flow was maintained during vacuum filtration and filters were replaced if
filtration rate decreased because of solids build up on the filters. Filtrates were collected in sterile
filter flasks and transferred to sterile sample bottles. Appropriate volumes of filtrates were then
filtered through 0.45 Eam pore size Gelman membrane filters (enterococci, fecal coliform and E.
coli) or 0.7 jlm pore size Millipore membrane filters (C. perfringens). Filters were incubated on
mTEC agar for fecal coliform and E. coli, mE agar for enterococci and on mCP agar for C.
perfringens analyses. Plates were incubated at 44.5ï¿½C for 24 h for all but enterococci, which were
incubated at 410C for 48 h.
       Effluent from septic tanks contains high levels of phosphorus, nitrogen and fecal-borne
bacteria. The effluent characteristics can vary widely, depending on many variables, and 'typical'
contaminant concentrations, based on numerous previous studies, are presented in Table 6. The
nitrogen discharged from septic tanks is in the forms of organic nitrogen and ammonium, with no
nitrate. Much of the phosphorus is orthophosphate. Thus, detection of nitrate in groundwater is
indicative of transformation of the ammonium to nitrate under aerobic (i.e., unsaturated)
conditions. The values in Table 6 can serve as a guide for assessing the effectiveness of study
systems and potential problem areas. There were no enterococci levels cited in reviewed studies,
so fecal streptococci levels, which would include enterococci as a subset, are presented. C.
perfringens levels were also not cited. These were included in this study as indicators of long-
term fecal contamination, as the spores produced by this organism can persist for long periods.
       There were two notable developments in this study that warrant mention before reviewing
the results of wellwater data. First, initial samples were processed by mixing water with soil
particles (M; Table 8, FILTER column) or allowing the prevalent soil particles to settle (S), then
analyzing the supernatant. This process resulted in the detection of relatively high levels of
bacterial contaminants that remained attached to suspended particles. The sampling and processing
protocols were then changed to include prefiltration (PF) to avoid including particulate matter in
water samples. However, the initial values were valuable to detect the presence of bacteria from
the subsurface at these well sites, even though many of the detected bacteria were probably
attached to particles. Second, the changes in groundwater flow direction at some sites shows how


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detection of distinct contaminant plumes in the subsurface can be complicated as contaminant
concentration gradients in groundwater become blurred as contaminants are transported in different
directions. The changes measured as part of this study are probably indicative of previous changes
in flow direction. Thus, contaminants that persist at previous downgradient sites may remain
detectable at later upgradient sites.
       The following is a series of discussions about each site and the within site trends and
conditions. Sample dates, six for each site, are presented in Table 7. Table 8 is a summary of all
data, and is separated into sub-tables, labeled 8A-8J, for each site. The dates for which there are
no data presented (labeled "NO B/N"; no bacteria/nutrients, under FILTER column) were days in
which the wells did not produce. The sites where sampling was most problematic are sites REH
on River St. and FDC, the site abutting a non-tidal marsh on Forest Drive. Some wells produced
on every sample date, while others at some sites produced infrequently. In general, the in-town
sites developed on natural soils produced better than the River St. sites, which were developed on
sandy fill over wetlands.

REH
       The effluent disposal area (EDA) at this site consists of separate graywater and blackwater
leaching areas. Both areas are located within twenty feet of the adjacent salt marsh, are within the
highest observable tide mark, and appear to be in a state of failure. This is indicated by excessive
vegetative growth over the blackwater EDA and the ponding of graywater, from a broken pipe, on
the soil surface over the graywater EDA.
       Analysis of groundwater from the monitoring wells indicates that high levels of total
dissolved nitrogen (TDN) have been detected at the edge of the EDA (well #5) and in the down
gradient well #2 (Table 8A). Ammonium (NH4) is the prevalent nitrogen form found at the edge
of the blackwater EDA (well #5) and appears to be transformed to nitrate (NO3) along the down
gradient toward well #2, as both wells 2 and 5 have high nitrate levels. The deep well #6, which is
situated between the graywater and blackwater EDA's, shows high levels of ammonium. This may
indicate a saturated subsurface environment in which the ammonium is not being oxidized as it
leaches downward. The elevated salinities in the wells at this site suggest significant intrusion of
tidal waters.
       Bacterial contamination (fecal coliforms, E. coli) was detected in the deep well at this site.
No bacterial contaminants were detected at wells #3, #4 or.#5, all of which were sampled only
once due to poor well production. Relatively high concentrations of Clostridium perfringens were
detected in the up gradient well #1 and the down gradient well #2 on the one sample data for both
wells (12/7/94).

RET
       The EDA at this site lies within 75 feet of poorly drained soils with soil mottling occurring
from 28 inches upslope to 20 inches downslope in fill (Elkind Environmental Associates, 1994).

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The highest levels of TDN were detected at the up gradient well #3 and at well #2 which is located
along the northeast edge of the property (Table 8B). The TDN for all samples were dominated by
ammonium, with nitrate reaching its highest, yet relatively low, level (3 mg/L) on 2/7/95 at RET-6,
below the EDA. The high levels of TDN at well #2 may indicate contamination coming on-site
from the neighboring property. The elevated levels in up gradient well #3 indicate a reversal in the
assumed prevailing groundwater flow direction determined on 3/13/95 but are consistent with the
groundwater flow direction observed on 5/31/95.
        Sometime between the end of March and June there was nearly a complete reversal in
groundwater flow direction. This may have been a consequence of sewer line installation which
occurred at about this time. Groundwater underneath River Street was continuously pumped for
several weeks (end of March to mid-April) to depress groundwater levels in order to accommodate
sewer installation.
       Down gradient well #4 had the lowest levels of TDN of any well, another strong indication
of groundwater flow reversal. Ammonium is the most prevalent form of nitrogen detected in all of
the wells and is indicative of a saturated subsurface environment. This corresponds well with the
soil mottling observed during the Order One soil survey and noted above.
       Microbial contamination was detected in all wells with the greatest levels and/or most
consistent contamination occurring in well #2 (near neighbor) and well #5 (edge of EDA). Very
little bacterial contamination was detected in well #6 which penetrates the EDA.

RB
       The EDA at this site consists of a cesspool and dry well both of which are within 30 feet of
very poorly drained soils and the highest observable tide. Overall, this site had the lowest TDN
levels of any other site (Table 8C). The TDN was typically dominated by ammonium. Only two
samples were obtained from the furthest down gradient well (#1) at this site due to poor well
production. Samples taken from well #1 show relatively low levels of TDN with ammonium and
nitrate having similar concentrations. No bacterial contamination was detected at well #1.
        Closer down gradient wells (#2 & #3) also showed relatively low concentrations of TDN.
Well #3 and Well #2, which lie down gradient of the cesspool and adjacent to the dry well,
respectively, had moderate bacterial contamination. Well #4, which is situated at the edge of the
marsh, had similar TDN levels as the other wells with most of the nitrogen being in the ammonium
form. Bacterial contaminants were also detected in Well #4. The highly saline groundwater at this
site suggests significant salt water intrusion. The relatively uniform data at this site do not indicate
the presence or interception of a contaminant plume moving off site.

RH
       The EDA at this site is located on a narrow piece of property squeezed between the property
owner's home and the driveway of the abutting property. The EDA is approximately 85 feet to
very poorly drained soils and the highest observable tide. Groundwater direction changed at this
site sometime between the end of March and the beginning of June. The groundwater pumping









occurred in a direction relative to this site that is consistent with the changes in flow direction.
       Elevated levels of TDN were detected in up gradient well #1, both before and after the
change in groundwater direction, with nitrate being.the prevalent form (Table 8D). Down gradient
wells (#3, #4 & #5-deep) had lower levels of TDN as compared with up gradient well #1. The
prevalent form of nitrogen in deep well #5 was ammonium. Wells #1, #2, and especially #5 had
elevated levels of orthophosphate (PO4).
       Microbial contamination has been detected in all wells with the greatest incidence occurring
in up gradient well #1, which is consistent with the observed change in groundwater direction.
Substantial microbial contamination has also been detected in down gradient well #3, which is at
the edge of the EDA, and to a lesser extent at well #4 further down gradient.

RP
       This site is served by a single EDA which is approximately 90 feet to very poorly drained
soils and the highest observable tide. There was a complete reversal in groundwater direction at
this site occurring sometime between the end of March and the beginning of June. The TDN levels
in the wells at this site were relatively low (Table 8E). There did not appear to be any discernible
trends or changes in ammonium or nitrate concentrations in any of the wells with relation to the
change in groundwater direction. Elevated salinities at this site suggest intrusion of tidal waters
into the subsurface environment.
         Well #1, located at the edge of the EDA, had the highest TDN levels of all wells with a
couple of samples especially elevated in nitrate. Well #2, the up gradient well, had relatively low
levels of TDN consistently throughout the sampling period. Down gradient wells #3, #4, and #5
all had relatively low levels of TDN with ammonium being the prevalent form in well #5 (deep).
Well #5 also had elevated levels of orthophosphate but had no bacterial contamination during the
sampling period. Bacterial contamination was detected intermittently in all other wells but was
greatest in well #1, which is adjacent to the EDA but neither up gradient nor down gradient.

RC
       This site is serviced by a state-approved system with the EDA located approximately 70 feet
to very poorly drained soils and the highest observable tide. The well locations are not consistent
with an up gradient and down gradient orientation seen at other sites, especially the location at
which the effluent enters the subsurface from this chambered system is unknown. Elevated levels
of TDN were detected at well #4 which penetrates the EDA (Table 8F). Ammonium was the
prevalent nitrogen form found in samples from this well. There was some microbial contamination
detected at this well although much lower than levels seen in the up gradient wells.
       Up gradient wells #1 (deep) and #3 also had highly elevated levels of TDN and
considerable bacterial contamination was detected in both wells. It is likely that these wells are
intercepting a contaminated plume from the abutting property since groundwater is moving on-site
from the adjacent property. Interestingly, no bacterial contamination was detected in well #2


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(shallow) which is adjacent to well #1, In addition, well #2 had considerably lower levels of TDN
as compared to well #1. Groundwater depths at wells #1 and #2 indicate that the groundwater is
moving vertically downward which may account for the differences between these wells. All wells
had elevated levels of orthophosphate.

CSL
       The EDA at this site consists of a leach field and a dry well both of which are within 60 feet
to poorly drained soils. Soil morphology indicates a down gradient water table of 30 inches based
upon iron redox depletions (Elkind Environmental Associates, 1994).
       Groundwater sampling shows elevated levels of TDN within the EDA (well #4) and at the
down gradient edge of the EDA (wells #3 & #5) (Table 8F). Ammonium is the prevalent form of
nitrogen within the EDA and may suggest an inadequate unsaturated zone for conversion of
ammonium to nitrate as the water percolates downward through the leachfield. However, nitrate is
the prevalent form of nitrogen seen at the down gradient edge of the EDA and suggests that
ammonium is converted to nitrate as the groundwater moves laterally down gradient. Similar
levels of TDN at down gradient (#3, #5, & #6) and up gradient (#1 & #2) wells indicate that no
significant contamination plume from the EDA at this site exists or was intercepted. Nitrate was
the prevalent form of nitrogen found in these wells. Microbial contamination was detected
frequently within the EDA while up gradient and down gradient wells showed only occasional
contamination.

WRH
       The EDA at this site was raised by fill and lies within 50 feet of poorly drained soils and
marsh. Elevated levels of ammonium and nitrate have been detected in up gradient (#1 & #2) and
down gradient (#3, #4 & #6) wells (Table 8H). High levels of ammonium prevail within the EDA
(well #5) and in the shallow well at the down gradient edge of the EDA (#4). The deep well #3,
also located at the down gradient edge of the EDA, shows high levels of nitrate indicating
conversion of ammonium to nitrate as effluent moves vertically downward. The furthest down
gradient well #6 has elevated levels of nitrate and may indicate the interception of a plume.
       Microbial contaminants were detected in all of the wells at this site. Interestingly, the deep
well #3 and shallow well #4 at the edge of the EDA showed extremely low and relatively high
levels of contamination, respectively. Relatively low levels of microbial contamination were seen
in the most down gradient well #6 as compared to the up gradient wells (#1 & #2). High levels of
ammonium, nitrate, and microbial indicators in the up gradient wells may indicate contamination
coming from off site.

KDB
       This state-approved system consists of two raised and adjacent EDA's that lie within 100
feet of poorly drained soils and marsh. All down gradient wells (#5, #6, #7, #8; well #9 did not

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produce) had highly elevated levels of TDN over up gradient wells (#1 & #2) (Table 81). The form
of nitrogen seen in the down gradient wells was almost exclusively nitrate. Nitrate was also the
prevalent form of nitrogen detected in the up gradient wells, although at much lower
concentrations.
       Samples taken from wells within each of the EDA's (wells #3 & #4) also showed elevated
levels of nitrate. Interestingly, well #4, which samples the EDA on the family side of this duplex,
has much higher nitrate levels than well #3, which samples the EDA on the single occupant side of
the duplex. This difference could be attributed to the different loading rates on each EDA as
affected by the the number of occupants. The prevalence of nitrate in all of the wells suggests that
there is a sufficient unsaturated zone beneath the EDA's for conversion of ammonium to nitrate.
However, the high levels of nitrate in all of the down gradient wells indicates that contamination is
moving off site.
       Bacterial contamination was detected at relatively low levels at all of the wells except well
#4 (family EDA). The greatest and most consistent bacterial contamination was detected in well #3
which sampled the EDA on the single occupant side of the duplex. Lack of an exact location for
the EDA's may account for the absence of microbial contamination in well #4 as its location may be
on the up gradient edge of the EDA and thus might miss any bacteria leaching under the EDA.
Bacterial contaminates were most consistently detected in well #6, which is down gradient of the
family side of the EDA.

FDC
       This site consists of graywater and blackwater disposal areas which are located 75 feet and
100 feet from poorly drained soils, respectively. This site is not influenced by nor situated near
any tidal areas. Only the down gradient well #5 at this site has produced samples on a consistent
basis. The ammonium, nitrate, orthophosphate, and bacterial levels in well #5 were very low
(Table 8J), and did not indicate the presence or interception of a contaminant plume.
       Wells #2 and #3 were sampled only twice during the sampling period. At both wells the
ammonium and nitrate levels fluctuated considerably between sampling dates, making it difficult to
identify any trends. The highest measured nitrate level (28 mg N/L) in this study was recorded for
the 1/9/95 sample at FDC-2. It should be noted that well #2 (up gradient) and well #3 ( down
gradient) had elevated levels of TDN on both sample dates.
       Little microbial contamination was detected at any of the wells at this site. Only a total of
12 groundwater samples were taken among the five wells between January and June because of
lack of well production.

Inter-site Comoarisons
        Shallow, 1" diameter cores were taken from the surface soils overlying the EDAs or in
adjacent beach sands at sites with designed subsurface EDAs (REH, RP, RC, KDB). Microbial
analyses were conducted and estimates of fecal coliforms and C. perfringens were made. The
sample at RPIRC was taken from the intertidal beach just in front of these two adjacent properties








and was 24" deep. The deepest core was 29" below the surface (REH) and the others were to 12".
The soils were sands, with organic matter at the surface, except for KDB which was a sandy loam.
In each case (except RP/RC) coring was limited by gravel layers in the EDAs. Only the core from
above the EDA at REH was positive for fecal coliforms (-30/g soil). All of the sites tested for C.
perfringens were positive at - 200/g soil except the deeper sample from the RP/RC site (90/g
soil). Thus, the surface soils above the systems exhibited some evidence of past fecal
contamination, with the REH site probably having more recent fecal contamination.
        The initial samples that were either mixed or sampled from the supernatant were of interest
to locate areas where bacterial contaminants were present in the groundwater or attached to
particles. The wells where bacteria were detected in these samples were not always wells where
bacteria were later detected in groundwater, and included wells that were upgradient, down
gradient, deep and within the EDAs, with no consistent location at the sites. The most commonly
detected bacterial indicator in these samples was C. perfringens, which is naturally associated with
particulate matter in soil and aquatic environments.
        The ranges of contaminant concentrations for all of the wells at each site are summarized in
Table 9. The lowest values in the concentration ranges presented are considered indicative of
background levels at each site. The River St. sites had higher background and much higher 'high'
concentrations of phosphates compared to the in-town samples. In addition, the background levels
of ammonium showed the same trend. The high phosphate levels may reflect the extreme high
density of houses and septic systems on River St. and accompanying high P-loading rates,
compared to the in-town sites. High ammonium levels suggest incomplete nitrification occurring
in the soils of River St., possibly a result of development on relatively shallow fill soils overlying
wetland soils that have more limited aerobic unsaturated soils required for nitrification.
       The background nitrate levels were very low at the River St. sites and at two of the four in-
town sites. These are not necessarily indicative of clean areas, rather, they may also reflect the
presence of wells, often under EDAs, that have little nitrate produced relative to TDN. The two
sites with highest 'background' nitrate levels are CSL and KDB, both located in relatively less
dense housing areas. These also have the highest average nitrate:ammonium ratios (Table 9).
These latter data indicate a high rate of nitrification relative to TDN. The River St. sites are again
apparently different from the in-town sites in that their ratios are all relatively low, with most below
1.0, while in-town sites have higher ratios, most well above 1.0. Thus, much of the TDN at in-
town sites has been nitrified, compared to a lower conversion at sites with low ratios.
       The high values in the presented concentration ranges for contaminants in Table 9 can be
compared to septic tank effluent concentrations in Table 6. Bacterial contaminant concentrations
never came close to estimated effluent concentrations. Orthophosphate concentrations were nearly
equal to the estimated effluent concentration (11 mg P/L) at RH, RP and RC, with concentrations
ranging from 6.9 to 8.9 mg P/L. Ammonium reached concentrations nearly equal to the estimated
effluent concentration (30 mg N/L) at sites REH, RET, RC, CSL, WRH, and FDC, all with
concentrations of 18-22 mg N/L. Nitrate is not discharged with septic tank effluent. However,


                                                12








TDN concentrations from REH, RH, RC, CSL, WRH, KDB and FDC were >20 mg N/L on one
or more occasions (Table 8). This occurred most consistently at RC and KDB.
       Temporal trends for all of the sites are typically quite variable (Table 8). Trends for
nitrogen species and phosphate at three sites are presented in Figures 11-14. These sites, KDB,
RC and RB were chosen to represent in-town, River St., and unoccupied sites, respectively.
Overall, site RB had the lowest levels of nitrogens than other sites, yet phosphates were still
relatively high (Table 9). At KDB, nitrate levels at upgradient wells were always lower than at
down gradient wells (Figure 11), indicative of downstream contamination from the EDAs at this
site. Ammonium levels remained relatively low throughout the sampling period except for April-
May, 1995 at KDB-7, a down gradient well. The higher ammonium levels (2.5 mg N/L) on
4/4/95 were accompanied by the second highest nitrate levels recorded in this study (27.3 mg
N/L). Thus, springtime conditions appeared to increase the nitrogen loading from this site,
apparently beyond the potential nitrification rate.
       At RC, levels of nitrate were variable at the different wells, while ammonium levels
dropped from high levels to lower levels with time (Figure 12). Nitrate levels were not as high as
down gradient wells at KDB, but ammonium levels were generally much higher than at KDB. At
RB, nitrate levels were quite low, especially after the first sampling in December, 1994 (Figure
13). Ammonium levels were also quite low, more similar to the KDB site than the RC site. Figure
14 shows phosphate levels at KDB and RC. Levels at RC were much greater than at KDB and
more variable. Levels of phosphate were extremely low at KDB, while the highest levels at RC
were at RC-4.

Surface Water Samulina and Evidence of Off-Site TransTort of Contaminants
       The concern with all of the contaminants is that they may be transported with groundwater
into surrounding surface waters. The sites that had wells installed in close proximity to surface
water or marshes are REH, RB, RC, CSL, WRH, KDB and FDC. The other sites, RET, RH and
RP had wells that were not very distant from the EDAs and were not that close to surface waters.
Of the sites with wells near marshes or surface waters, high nitrate concentrations were detected at
REH (11.5 mg NIL), RC (14.1 mg N/L), WRH (11 mg N/L) and KDB (27.3 mg N/L). Thus,
these sites are likely to be contributing nitrogen to the surrounding waters. In all cases, the
nitrogen loading from the EDAs is relatively high and the distance to the marsh/surface water from
the EDA is apparently inadequate to promote dilution or transformation of the highly mobile nitrate.
       A shoreline survey was conducted on 6/2/95 to find any evidence of septic system 'failure'
at River St. sites. This exercise compliments the well monitoring in that it can help to determine if
any surface runoff from 'failed' septic systems could contribute to surface water contamination.
The results and descriptions of suspected contamination sources are presented in Table 10. Five
potential problem sites are listed between houses 14 and 37 on River St. The seepage from under a
retaining wall on the beach in front of house #14 showed no contamination. However, the seepage
and pipe effluents at houses 14, 30 and 31 gave detectable fecal contamination.
       Surface water samples collected in streams or harbor waters near to every site (Figure 1)

                                               13








were analyzed for bacterial contaminants in June, 1995 (Table 11). Values may be compared to the
state limits for approved shellfishing (14 FC/100 ml), marine swimming waters (35
enterococci/100 ml) and freshwater swimming areas (47 E. coli/100 ml).
The geometric mean fecal coliform concentrations at every site were >14/100 ml, with the highest
levels at sites 3-5 and 7 near Causeway St. in the Shepard Brook area. A high percentage of fecal
coliforms were in fact E. coli (Table 11). Enterococci levels also were greater than the 35/100 ml
limit at all sites except for site 6 in the relatively large Blackwater River at the Rt. 286 bridge
(Brown's Bridge) and the Forest Drive pond. However, the latter site is a freshwater body, and it
does not meet freshwater swimming limit of 47 E. coli/100 ml. All of the surface water sites
except for site 6 were on small tidal or freshwater streams that eventually empty into Hampton
Harbor.
        There were no obvious upstream-downstream gradients for bacterial contaminants relative
to the study sites. Obviously ,the study sites are not the only houses that abut the target surface
waters, and other sources of bacterial contaminants are apparently contributing to the impacted
surface waters. The results of analysis of these surface water samples are not yet available, and
should help to determine potential impacts of specific sites on surface water quality.

CONCLUSIONS

        The sites selected for study were not uniform in anyway that would facilitate a systematic,
scientific assessment of factors associated with the effectiveness of subsurface sewage treatment.
However, the selected sites probably are a reasonable reflection of actual systems in older coastal
developed areas. It is unfortunate that a wider range of soil types could not be included in this
study. However, again, the sites selected were limited to sites within Seabrook and in close
proximity to tidal or tributary surface waters, thus excluding many areas that could represent a
wider range of coastal New Hampshire soils. In the final analysis, it is amazing to find so many
willing participants for such a study.
       Despite the observed changes in groundwater flow direction that complicated the location of
distinct contaminant plumes at some sites, it is apparent that most of the study sites have relatively
contaminated groundwater. Even RB, which has not been occupied for a few years so that the
EDA has not been used, has elevated levels of phosphate in groundwater even out near the marsh
edge. The contaminated groundwater probably has some impact on adjacent surface waters,
especially in high density housing areas. The areas of highest housing density are the River St.
sites and FDC, which is at the edge of an older high density housing development. In addition,
WRH is located next to and downgradient from an elementary school on septic systems and
numerous other houses, while KDB is at the end of a new development with a relatively high
density of houses and associated mounded effluent disposal areas. All of these sites are in close
proximity to surface waters, and the loading rate of nutrients, especially nitrate, measured in wells
probably exceeds the capacities of the remaining or nonexistent riparian zones to effectively treat


                                                14








contaminants.
       The bacterial contaminants were not transported consistently or in'high quantities via
groundwater. Bacteria are not as mobile as nitrate, and are probably more tightly associated with
soil particles. However, especially in initial samples that included some particulate matter, fecal-
bome bacteria were detected in wells away from EDAs, evidence of past transport to those areas by
some mechanism. The method adopted for routine sampling of wellwater for bacteria is a
conservative approach that excludes most particle-associated bacteria. Some frequency of
including particulate matter in samples in the future would give temporal documentation of the
presence or absence of bacterial contaminants at downgradient sites.



REFERENCES

Elkind F. and D.J. Allain. 1994. Tidal water site assessment: Implementyation of tidal water
assessment forms for selected Seabrook properties and Order One soil surveys. Report to NH
Coastal Program, Office of State Planning, Concord NH.







Table 1. Seabrook study site descriptions and designations.


RIVER STREET

REH -Year-round home on south side of River St.abutting marsh; lot #48.

RET -Year-round trailer on lot on south side of River St.; lot #48.

RH    -Year-round home on north side of River St.; lot #14.

RP    -Year-round home on north side of River St.; lot #15.

RC    -Year-round home on north side of River St.; lot #15A.

RB    -Infrequently occupied home on south side of River St. abutting marsh; lot #33.

WALTON ROAD

WRH -Year-round home near corner of Causeway St. and Walton Rd. abutting Shephard Bk.
marsh; lot #46C.

CAUSEWAY STREET

CSL -Year-round home on east side of Causeway St. abutting Shephard Bk. marsh.

KIMBERLY DRIVE

KDB   -Two adjoined year-round homes at end of Kimberly Drive abutting Farm Brook.


FOREST DRIVE

FDC -Year-round home on south side of Forest Dr. abutting non-tidal Cains Brook; lot #141.















                                        16








Table 2. Soils and subsurface characteristics of study sites.



Site    Soil map symbol  Septic system        Depth to       Dominant soil Septic system Wet area System   State
          for EDA area     limitation     mottling/water    downgradient   limitation             age (y) approval

                                   Adjacent to freshwater marsh
FDC           313A           Severe             37"             915C             ?        marsh    10+         ?

                                 Adjacent to tidal marshes; in town
WRH           100A             ?                28"            100A/B            ?        marsh       7       no
CSL           26A            Severe             30"             313A          Severe      marsh      37       no
KDB           299A             ?                29"           299E/313A       Severe      marsh      7       yes

                            Adjacent to tidal marshes or beach: River St.
RH            300A             ?                               300A/C            ?        beach       5
RP            300A             ?                               300A/C            ?        beach    40+        no
RC            300A             ?-                              300A/C                     beach      8+      yes
RB            100A                              17"           lOOA/797A       Severe      marsh    30+        no
RET           lOOA             ?                20"              100A            ?        marsh      2+       no
REH           IOOA             ?                20!'"         100A/797A       Severe      marsh    10+        no












                                                                       17







Table 3. Numbers, names and properties for soils at study sites.


26A  Windsor:
           Very deep, excessively drained sandy loam/loamy sand/sand
           severe septic system limitation-poor filter

100 Udorthents, wet substratum:
           poorly drained sandy loam filled w/moderately well drained sandy
             loam/sand fill
      or   granular fill/black loamy sand over saturated wetland

299 Udorthents, smoothed:
           well drained smoothed sandy loam filled over w/loamy fill

300  Udipsamment:
           excessively drained excavated and eolian sand

313 Deerfield:
           Deep, moderately well drained sandy loam/loamy sand/sand
           severe septic system limitation-wetness, poor filter

497 Pawcatuck:
           very deep, very poorly drained saturated hemic material/fsl/ls on
tidal marsh fringe
           severe septic system limitation-ponding, poor filter

797 Matunuck
           tidal marsh, flooded at high tide, very poorly drained saturated
organic fibers/sands
           severe septic system limitation

915  Unnamed aquic Udipsamment:
           Deerfiled-like profiles filled over w/moderately well drained sandy
fill





                                         18













Table 4. Installed well characteristics.


  well      TOC    Total L,=gth Stick-up Total Well  4d Intava.l DewI    Curret     ICuret Depth to Saeen
         Eilevation   ofWell             Depth BGS  Top  BooxttomTOCFElevationlStick-up  Bottomfmont
            (ft)       (ft        (in)    Ift         (t)    (ft)        (t          Vn)~ M OC(ft)
 CSL-1    91.2         11.00      48.00      7.00     1.00   6.00        87.2.2      0.00              6.00
 CSL-2    87.34        11.00      48.00      7.00     1.00   6.00        87.36       0.00              6.00
 CSIA-    89.67        11.00      48.00      7.00     1.00   6.00        85.61        0.00             6.00
 CSL-4    90.51        11.00      48.0 0     7.0      1.00   6.00        86.47   OM0                   6.00
CSL.-SD   86.37        16.83      49.00   I2.75    6.75   11.75          85.61       0.00             11.75
 CSL-6    88.50        11.00      4750       7.04     1.04   6.04        84.55       0.00              6.04

WRH-I    90.26        11.00      48.00      7.00      1.00   6.00       90.26       48.00             10.00
WRH-2    90.56        11.00      49.00      6.92      0.92   5.92       90.56       49.00             10.00
'WRH-3D   88.48        17.83      38.00      14.67    8.6    13.67       88.48       38.00             16.83
W~RHl-4    88.79      11.0       42.50      7A6       1.46   6.46       88.79       42.50             10.00
WRtH-S    90.53       11.00      48.00      7.00      1.00   6.00       90.53       48.00             iaw0
WRJA-6    87.68       11.00      48.00      7.00      1.00   6.00       87.68       48.00             10.00

  RB3-i    103.61      11.25      48.00      7.25      1.25   6.25       103.61      48.00             10.25
  RE3-2    103.32      11.00      45.5       721       121   6.21        103.32      45.50             10.00
 RB3-3    103.30      10.96      48.00       6.96     0.96   5.96       103.30      48.00              9.96
 RB-4    103.38       10.71      44.13      7.0       1.03   6.03       103.38      44.13              9.71

  RH-i    102.97       11.00      24.00       9.00     3.00   8.00       .102.97      12.00             9.00
  RH-2    102379       11.00       12.50      9.96     3.96   8.96       102.79       12.50            10.00
  RH-3    103.09       11.00       12.00     10.00    4.00   9.00        103.09       10.50             9.88
  RH-4    102.35       10.67       8.40      9.97      3.97   8.97       102.35       6.88             9.54
  RH-S    103.22       21.17       5.26      20.73    14.73  19.73       103.22      13.00            20.81

  RF-i     98.13       10.71       7.00      10.12    4.12   9.12        10146        0.00              9.12
  RP-2     98.35       11.00       6.50      10.46    4.46   9.46        102.00       5.00              9.88
  RP-3     98.46       11.00       6.00      10.50    4.50   950         102-57       7.13             10.09
  RP-4      101.90     11.00       4.00      10.67    4.67   9.67        101.90       0.00              9.67
  RP-5      101.96    215)   MOD0            18.25    12.25  17.25       101.96   Om0                  17.25

  RC-1      105.23     20.2       74.00      14.08    8.08   13.08       105'23       12.30            14.11
  RC-2      104.72     11.00       0.0       11.00    5.00   10.00       104.72       6.00             10.50
  RC-3      103.57     11.00       7.00      10.42     4.42   9.42       103.57       0.00              9.42
  RC-4      102.12    11.00        5.72      10.52    4.52   9 52        102.12   Om0                   9.52

 1KDB-I   100.00   I11.00         19.50      9.38     3.38   8.38        100.00       0.00             8.38
 KDB-2    100.26       11.00       2.50      10.79    4.79   9.79        10026   OM0                   9.79
 K1DB-3   100)29       11.00      18.00      9.50     350   8 50         100.29       0.00             8 50
 KDB-4    100.15   I1.00          1920       9.40     3.40   8.40        100.15       0.00             8.40
 K1DB-S    97.02       10.38      18.84      8.81     2.81   7.81        97.02        0.00             7.81
 K1DB-6    97.10       11.00      21.84      9.18     3.18   8.18        97.10        0.00             8.18
 KDB-7    98.70        11.OD      21.36      9.22     3227   8.22        98.70        0.00             822
 11DB-8    97.57       11.00       9.60      10.20    4.20   9.20        97.57        0.00             9.20
 KDB-9    98.39        21.00      56.40      16.30    10.30  15.30       98.39        0.00            15.30

 FDC-1    100.0        11.00       9.72      10.19    4.19   9.19        29.69       0.00              9.19
 EDC-2    99.90        11.00      25.20      8.90     2.9    7.90        29.61        0.00             7.90
 FDC-3    99.98        11.00      20.40      9.30     3.30   8.30        29.87       0.00              8.30
 PDC-4    100.18       11.00       4.80      10.60    4.60   9.60        29.90       0.00              9.60
 FDC-5    94.19        14.17      40.50      10.80    4.80   9.80        24.49       40 .50           13.17

 RET-i    98.17        10.00      4350       6.38     0.38   5.38        98.'17      0.00              5.38
 RET-2    101.55       11.00      47.00      7.08     1.08   6.08        101.55      45.75             9.90
 RFT-3    98.31        10.58      4150       7.12     1.12   6.12        98.31       0.00              6.12
 RET-4    100.59       11.00      4825       6.98     0.98   5.98   IO0059           24.00             7.98
 RET-S    100514       11.00      47.50      7.04      1.04   6.04       10054       18.33             7.57
 RET-6    98.85        11.00      47.25      7.06     1.06   6.06        98.85       0.00              6.06

 REH-i    100.79       10.42      40.50      7.05      LOS5   6.05       100.79      40.50             9.42
 REH-2    100.93       10.33      40.50      6.96     0.96   5.96        100.93      40-50             9.33
 REH-3    100466       11.00      47-50      7.04      1.04   6.04       100.66      46.50             9.92
 REH1-4   101.06       11.00      47.00      7.08      ins8  6.08        101.06      43.13             9.68
 REH-5   100.93        11.00      47.75      7.02     1.02   6.02        100.93      44.50             9.73
 REH-6    101.10       21.00      45.60      17.20    11.20  16.20       101.10      43.75            19.85














 Table 5. Groundwater elevations at Seabrook study sites.
      CSL       I                                          GROUNDWATERELEvAIONS(fI)
                         1214941           2/16/95          2/23/95          3130/5           51111951          6561S51       (f 6/29,951
                    I  (ft)      I       (ft)             (0t)             (0)              (F)           U          r          )
     CSOL                  83.95             8338             83.90            84.25            8328             8325              8273
     CSL-2                 83.62             8330             83.54            86.51            83.02            83.01             8256
     CSL.3                 83.18                              83.07            83.0             8245             82.47             81.86
     CSLA                   83.56                             8351             83.48            82.94            82.84             8232
    CSLAD                  83.24             91.66            91.83            9183             82.69            82.84            8198
     CSL                    8250                              82.40             8220             Sim             81.73             81.05

     WRH                 12/14/94          2/16/95            31295          3/30/95           416/95          Sn 1195           6,29/0
    WVH-I                  82.94             8335             83.66            8327             83.09            8251             81.45
    WRH-2                  8335              90.56            84.46            8337             83.13            82.49            82.12
    WRH-3D                  85.12             82.83            82.96            8281             82.61            82.09            8123
    WRVa 4                 82.99             88.79            8298             82.81            82.59            82.04            81.12
    WVIH-5                 82.31             90.53            8329             8327             82.85            82.31            8158
    WRH-6                  82.76             87.68            82.43            8232             8210             81.74            80.68

RB                        12J6/94          3/15/95           Sf1195            6/6/95          6129/95
      RB-9                   96.4
      RB-2                  97.04            96.46             9527             94.7             95.05
      RB-3                  98.04            96.47             9528             94.95            95.06
      R8R4                  97.39             98.81            95.83            95.17            95.42

RH                        12/6,94           12/1/94          3/15/95     5    f249              6/6/95          6/29195
     RH-I                  95.13             96.42            99.73            94.81            94.52            94.49
     RH-2                  96.29             96.45            98.52            94.79            9454             94.55
     RH-3                  96.17             96.34            95.68            94.96            94.58            94.53
     RH-4                 102.35            1025              97.39            95.17            94.75            94.69
     RH-5                 10322              92.20            96.84            95.75            92.44            95.46

RP             I         12/10/94          3/35195          5/18/95          5/24/95          6129/95
      RP-I                  94.85            94.71             9425             93.91            93.40
      RP-2                  95.21            98A9              94.10            93.57            9325
      UP-3                  9529             94.75             9427             94.46            9356
      RP-4                  94.90            94.71             9435             94.52            93.40
      RF-5          RVALVEI                  95.78             90.76            93.31      9      3.71

RC                       12/10/94          3/23/95           5/18/95          5/24/95          6129/95
     RC-1                  96.20             96.02            9623             95.08            95.00
     RC-2                  98.97             93.72            91.22            95.60            94.29
     RC-3        I$VALTUEI                   9722             95.67            95.72            94.73
     RCA         I#VALUEM                    96.12            95.17            97.82           9437

KDB                      12/22/94           317/95           3/23/95           4/4/95           S/2/95          5/2/95           6a9/95
    KlDB-I                  7.51              532              4.96             5.48             5.83             3.82             7.06
    KDB-2                   8.26 X                x                             5.90             622              6.17             7.12
    3DB-3                   7.82              5.85             537              6.04             6.26             623              734
    YJ3-4                   8.02              6.04             5.73             6.18             6.46             6.40             7.75
    KDB-S                   5.73              4.0              3.48             3.96                              4.46             5.78
    KD8 -6                  7.64              533        5      .24             5.80             63               622              8.81
    KD0-7                   6.42              7.45             4.19             4.71             5.22             520              6.56
    KDB-8                                     559             .5.06             5.70             631              6.10             8.22
    KD8-9                                     4.80             1.67             4.48            10.06             5.11             6.12

FDC                      12/25              3/9195            4/6/95           5295            3/22/95           6,5/95          6/9/95
     FDC-1                  930              23.69            23.54            2326             23.41            23.15             22.82
     FDC-2                  94.54            25.19            24.79            2439             24.46            24.38             23.99
     FC-3                   93.04            2428             23.84            2333             23.82            23.48             21.46
     FDCA                   94A3             24.80            24.69            2424             24.57            24.15             23.67
     FDC-5                  88.13            19.17             1829             1820             1839             17.92            1738

RET                       1013/94          3/13/95           4/13/95           5/4/95         5/31/95           6/29/95
     RET-I                  9456             9752             95.73            95.73            94.75              94.1
     R=T-2                96325             96.845           96.845           97365            94.785           94.095
     2-3                    94.77            97.61            96.99             95.7            92.98            94.17
     RET-        4           9441            97.94            96.79            96.07            95.09    RVALUIM
    RET-S                 93.955           98.525           96.705           96.045           95.035           94.085
     RET-6                92.815            98.845           96.985           89.435           94.615    IVALUEI

REN                       10/3/94          3113/95          4/13/95            514/95          5/31/95          6/9195
    RE1-0                  96.92            96.89             96.14            9527             9459             9427
    RER-2                  96.93            96M 59623                          96.22            9620             95.80
    RMi-3                  96.36            95.11             95.26            95.36            95.33            94.80
    KER-4                  95.91            96.06             96.)3            9520             95.09            94.49
    RM-E                   95.47            95.31             95.31            9531             95.13           94.88
    RENA         6        101.10            9631              96.              91.69            93.00            9426








                                                                                               20







Table 6. Estimated concentrations for bacteria
and nutrients in septic tank effluent.



                BACTERIA
Fecal coliforms                    1.00E+06 per 100 ml

Fecal streptococci                 1.00E+05 per 100 ml

                NUTRIENTS

Nitrogen                      40 mg/l
  NH4                           30 mg/l
  organic                        10 mg/l

Total P                       13 mg/l
  P04                            11 mg/1































                                              21








Table 7. Sampling dates for all sites in Seabrook.

                                                SITESI
    DATE   REH RET  RB  RH  RP [RC  CSL WRH FDC KDB
    12/7/94  IX    X    X    X
    1/3/95                                                             X        X
    1/9/95                                                                               X        X
   1/16/95                                           X       X
    2/7/95         X    X    X
    2/9/95                                   X    X           X
   2/16/95*                                                                     *
   2/23/95                                                             X
    3/2/95                                                                      X
    3/'7/95                                                                                       X
    3/9/95                                                                               X
   3/13/95         X       X
   3/15/95                          X    X  ~X
   3/23/95                                                    X                                   X
   3/30/95                                                             X        X
    4/4/9 5                                                                                       X
    4/6/95                                                                      X        X
   4/13/95         X       X
   4/18/95                          X       X
   4/20/9 5                                          X        X
   4/25/95                                                             xX
    5/2/95                                                                               X        X
    5/4/95         X        X
    5/9/9 5*
   5/11/95                                                             X        X
   5/18/95                                           X        X
   5/22/95                                                                               X        X
   5/24/95                                  X        X        X
   5/31/95         X       X        X
    6/5/95                                                             X                 X
    6/6/95                          X       X












                                                      22






Table 8. Water quality data for Seabrook well water.

Table GA. REH site.
WELL: FREH-1                                                                         Urn     rg/L      urn      mg/L       mg/L        urn     rg/L
  DATE   SALINITY TEMP  PH  CONDUCT H20 DEPTH   FC         Ec   Enteraccoci  CP    N03    N03-N    NH4         NH4-N  N03INI-14.N    P04       P04   TIDE  FILTEEI
1 2/ 7/9 4    1 5                                   0      0        a       700   10.96    0.1I5   121.71    1.70          1.86      0.32      0.03    7       M
 2/7/95                                                                                                                                                 L    FFIOZENJ
3/1 3/95   9.8    5.2         1150.0      3.9       0      0        0         0    5.695  MG0        39.66    0.56         0.63     0.1037    0.01    L        IF
4/113/95                                 4.65                                                                                                          H    NO BIN
 5/4/95     6                            5.52                                       5.247    0.07   162.35    2.27         2.35       0.022    0.00    L      NOB
56/3 1/95                                 6.2                                                                                                          L    NO BIN
                                                                                 MEANm   0.10                1.51       1.61    ___    0.01

 WELL:    REH-2
 DATE   SALINFVY TEM4P  DIH  CONDUCT H20 DEPTH   PC       Ec   Enteroccoci   C?     N03    N03-N    NH4       NH4-N   N03INH14'N   P04        P04   TIDE  FILTER
1 2/ 7/9 4    13                 a                         0        0        63   617.61   11.45    84.66       1.19      1 2.63     0.11   Coot    7          M
2/7/.95                                                                                                                                                L   FFUZENJ
13/1 395    3.4    8.6        2950 .    4.88                                                                                                           L   NO BIN
4/11/9g5                                  4.7                                                                                                          H   NO B/N
 514/95                                  4.71                                                                                                           L   NO B/N
5/31/9 5                                 4.73                                                                                                          L   NO B/N
                                                                                 MEAN= 11.45                 1.19       12.63               0.01

 WELL'    FIEH-3
 DATE   SALINITY TEMP  pH-  CONDUCT H20 DEPTH   FC        Ea   Enteroccoci   C?    N03    N03-N    NH-4    NH4-N  N03/NH4-N    P04            P04   TIDE   FILTER
12/7/94    15                                       0      0        0         0    54.95    0,77    70.02      0.98        1.75       0.1      0.01    7       M
 2/7/95                                                                                                                                                 L   FFI:ZBEJ
3/13/95    9      10          12200      5.55                                                                                                          L   NO B/N
4/13/9 5                                 5.4                                                                                                           H    NO B/N
5/4/95                                   5.3s                                                                                                          L   NO B/N
5/31/95                                  5.33                                                                                                          L   NO B/N
                                                                                 MEAN--  0.77                0.98       1.75                0.01
                                                                                                                                                                                                                   C11)

 WELL:    REH-4
 DATE   SALINITY TEMP  pH  CONDUCT H20 DEPTH   M          Ec   Enteroccoci   C?    N03    N03-N    NH-4    NH4-N  N03INH14-N    P04           P04   TIDE   FILTER
1 2/7/9 4    15                                                     0         0     5.93    0.08   233.94    3.28         3.36        0.13     0.01    7       M
2/7/9 5           .L   FFRJZE'J
3/13/95  _ _  _ _  __         _ _  _ 5    5_                                                            _ _  _ _  _ _ _  _ _  _ _                      L    NC)B/N
4/13/95                                  5.03                                                                                                          H    NO BIN
5/4/95                                  5.76                                                                                                           L   NO /BN
5/31/95                                  5.97                                                                                                          L   NO B/N
                    _______________________________                               ~~~~~~    ~~~~~~~MEAN--  0.08  3.28     3.36                0.01


     WEL:  EH-5
 DATE   SALINITY TEvIP  pH  CONDUCT H20 DEPTH   FV        Ec   Enteroccoci  C?    N03    N03-N    NH4    NHI4-N   NO3/NI-4-N    P04           P04   TIDE   FILTER
1217194    4                                        0   a       a             0    1 090.8  15.27  1 378.97   1 9.31      34.58       0.2  OM0         7       M
2/7/9 5    6.5     1   7.38                                                         9,94    0.14   1435.73   20.10       20.24      0.104    0.01    L       NOB
3/13/95    1.8    8.5         1 900      5.62                                                                                                          L   NO BIN
4/1 3/9 5                                5.62                                                                                                          H    NO B/N
6/4/95                                  5.62                                                                                                           L   NO B/N
5/31/95                                  5.8                                                                                                           L   NO BIN
                                                                                 MEAN=   7.70               19.70      27.41                0.01


 WELL:i  REH-6 DEEP
 DATE   SALINITYjTFMP  pH  CONDUCT H20 DEPTH   FO         Ec   Enteroccoci   C?    N03    N03-N    NH4        NH4-N  N03/NI-4-N   P04         P04   TIDE   FILTER
12/7/94         1                                                                                                                                      7   NC)WELL
2/7/95    13.9  I 3.5        12500                 2 9   9          0        0     0.33    0.00   772.371   10.81        10.82      0.032    0.00    L        S
3/1 3/95   10.2  I7.6         13000      4.79       7    0.75       0         0     3.71    0.05   48.786    0.68         0.73      3.9868    0.31    L        FI
4/13/95    2                             6 .05      0      a        a         0     5.24    0.07   217.51    3.05         3.12      10.708    0.85    H       RFF
5/4/95    10 o                          9.41       0       0        0        0    0.764    0.01   399.23    5.59          5.60       9.98     0.79    L       IF
5/31/95    1 3   a                        .                         0         0    2.552    0.04   442.841    6.20        6.24      1 2235    0.97    L       IF
                                                                                 MEAN-   0.04                5.27       5.30      -         0.58




     f        I.
Table ~l~!e RET'site
i'i~i~!~i!'g[ "'~i;;f::i::ili?:iii?:i::i?:ili::i
      tE:;...i..;:..
                  -- u m m ~1L                                                                     u m m_ g / L m 9 / L             u m m 9 / L
DATE SALINITY TEMP pH CONDUCl H20DEPTH I:C El; Enleroccocl  Gï¿½ NO3 NO3-N NH4 NH4-N NO31NH4-N PO4 PO4 TIDE FLTER
1217194 0 O 0 O                                                                0 14.44 0.20 184.62 2.58 2.79                               0.14 0.01 ? M
 217195 L NO B/N
3113195 2.2 3                    2000 0.65            0 0 0                     0 5.03 0.07 313.23 ' 4.39 4.46 0.152 0.01 L PF
4113195 1 1.17                                        0      0 0.5 1 3,96                       0.06 313,31 4.39               4.44 0.185 O.O1 H PF
 514195 2 2.44                                        O     0 0 0.25 0.014 0.00 185.85 2.60 2.60                                          0.017 0.00    L          PF
5131195 3.42 L NO B,'N
                                                             MEAN= 0.08 3,49 3.57                                         0.01



DATE SALINITY TEMP pH CONDUCT H20 DEPTH FC I~ Enteroccoci GO                            NO3 NOa-N NH4 NH4-N   NO31NH4-N PO4 PO4 TIDE FLTEIq
1217195    0 0 0 40 60    44.54 0.62 136.69 1.91 2.54 0,12 0.01 ? M
 2/7/95   0.5 I 7.42 395 21 21 22 6 8.18 0.11 321.94 4.51 4.62 0.019 0.00 L S
311~195 0.4 5.8 345 4.7 0.75 0.76 20.25 0 45.35 0.63 64.75    0.91 1.54 0.611    0.05 L PE
4113195    0                                        0.25 0.25 3.5 18.75   53.84 0.75 1037.06 14.52 15.27 O.113 0.01 H PF
 514195 0 4.18 17 16 7.5 0    105.84 1.48 1169.83 16.38 17.86                                                                             0.061 0.00 L PF
5/31/95 6.76 L NO B/N
                                                             MEAN= 0.72 7.64 8.37 0.01



DATE SALINITY TEMP pH CONDUCl H20DEPTH FC    B3   Enleroccocl GO NO3 NO3-N NH4 NII4-N   NO3/NH4-N PO4 PO4 TIDE FILTER
1217194    0                                          0 0 0 0 18.32 0.26 1146.15 16.05 16.30 0.17 0.01 ? M
 217195                                                                                                                                                     L   NO B/N
3113195 4 3.8 4080 0.7 0 0 0                                                    0 7.14 0.10 73.16 1.02 1.12 0.062 0.01    L                                        PF
4/13/95 I 1.32 0                                            0         3 2 0                     0.00 -1346.47 18.85            18.85 1.982 0.16 H PF
 514/95 3 2.61                                        0     O         0        0       0.3 0.O0 743.35 10.41 10.41 0.023 0.00 L PF
5131195 L NO B/N
                                                             MEAN= 0.00 11.58 11.67 0.04



DATE SALINITY TEMP DH CONDUCT H20DEPTH R~    ED Enteroccoci  GO NO3 NO3-N NH4 NH4-N NO31NH4-N PO4                                                   PO4 TIDE FILTER
1217194 0 0 O                                                         0 0 27.13 0.38 91.46 1.28                                1.66        0.4      0.03 ? M
 217195 3.2 1                    3100                 0 0 2                    8 L S. ~ON
3113/95 2.2 3.8 2250 2.65 2.5 0                                      0.5        0 4.43 0.06 16.8 0.24 0.30                                0.037    0.00 L PF
4113195    2                                3.8 0 0                  0.6 0 2.7 0.04 82.72 1.16 1.20                                       0.304 0.02 H FF
 514195 0                                  4.52       0 0 0.75 0 1.15                           0.02 49.58 0.69 0.71 0.018 0.00 L PF
5/31195 0 15.2                              5.5 0 0                  0,5        0 2.124 0.03 57.332 0.80                       0.83 0.294 0.02 L PF
                                                             MEAN= 0.11 0.83 0.94 0.02



DATE SALINITY TEMP pH CONDUCT H20DEPTH   FI3    B3 Enteroccocl  GO                     NO3 NO3-N NH4 NH4-N   NO3/NH4-N    PO4 PO4 TtDE FILTER
12/7/94 0                                             0 0 0 0 71.01 0.99 55.64 0.78                                            1.77 0.15 0.01 ? M
 2~7~95 2           1 1920 0                                0         0        0      1.68 0.02 137.19 1.92 1.94 0.038 0.00    L                                   S
3/13/95    3 4 2900 2.01 0                                   0        0 0 14.57 0.20 16.39 0.23                                0.43 0.093 0.01 L PF
4/13195 I 3.83 0.25 0.25                                              0       0.25 1 6 0.22 54.11    0.76 0.98 0.372 0.03 H PF
 514195 1 4.49 6.75 6.75 0.5                                                   0      1.95      0.03 168.2 2.35 2,38 0.077 0.01 L PF
5131195    0 13.5                           5.5 0 0 0 O 0.009 6.00 46.145 0.65 0.65 0.258 0.02 L                                                                   PF
                                                             MEAN= 0.25 1.11 1.36                                         0,01



b~'i~ ......I"'~LINï¿½'iY'I TEMP pH CONDUCT H20DEPTH FC I:r:. Enteroccocl  03            NO3 NO3-N NH4 NH4-N   NO3/NH4-N PO4 PO4 TIDE FILTER
1217194 NO WELL
 217195 2.2 1 1600 0 0                                                0        0 212.43 2.97 269.29 3.77 6.74 0.07 0.01 L                                          S
             I
3/13/95 2.8 I 5 2950 0 0                                     0        0         0 8.14 0.09 27.32 0.38                         0.47 3.097 0.24 L PF
4 I--~'37~ 2 I 1.86 0 0 0.25 0 5.63 0.08 190.93 2.67 2.75 7.812 0.62 H PF
 514/951 I L NO B,'N
                  __ __ 4.23 L   NO B/N
                                                             MEAN= 1.05 2.28 3.32 0.29
5/31/95J~__~











Table 8C. RB site.

W8L RBiur                                                                                   n/L    urn       mg/L       rg/L        urn    rg/L       ______
 DATE   SALINITY  TEMP   pH  CONDUC-T H20 DEPTH   FC    FO  Enteroccoci  (P    N03   N03-N    NH4    NH4.N   N03INH4-N    P04    P04  TIDE    FILTER
12/7/94    1 0                                        0     0        0        0   21.790  0.305  27.490   0.385         0.690      0.460  0.036   ?         M
2/7/95                                 ___________________________________                                                                         L     NO 2/NW
3/115195    3.8    5.5           6200                 0      0       0        0   10.550  0.148   26.090   0.365        0.513      13.115  1.3    H         PF.
4/1 8195                                                                                                                                           L      NO B/N
5/31/95                                                                                                                                            L     NOB/IN
 6/6/9 5                                                         _  _  _ _  _  _  _ _  _  _  _ _  _  _  _ _   _  _                                 E      NO  B/N
                                                                                  MEAN=  0.225              0.375      0.6011             0.536



 DATE   SALINITY.TEMP   pH  CONDUCT H90 DEPTH   FC   BM  Enteroccoci  CP    N03   N03-N    NH4    NH4-N   N03/NH4-N    P04    P04  TIDE    FILTER
1 2/7/94    13                                       65             830       0   12.890  0.180  41.610   0.583         0.763      0.170  0.013   ?         M
2/7/95                                                                                                                                             L     NO B/N
3/1 5/95   15.5     5           17200      6.86     0.25  0.25    0.75        0   0.000   0.000  62.100   0.869         0.869      4.966  0.392  H          I
4/1 8/95    2 3                                       0      0       1        0   0.281   0.004   28.245   0.395        0.399      1.368  0.108   L         P
5/31/95    23       1 6                    8.,05     0.5   0.5      0.25      0   0.000   0.000  79.821   1.117         1.117      5.352  0.423   L         FIF                  LO)
6/6/95     29                             8.45       3      a      0.75       0    1.829   0.026   39.822   0.558       0.583      1.0115  0.080   E       IF                     j
                                                                                  MEAN-- 0.042              0.704      0.746              0.203


 ..   . ...I.  ..
 DATE -SALIIT   TEMP   pH  CON'DUCT H20 DEPTH   IC    B   Enteroccoci  (P    N03    N03-N    NH4    NH4-N   N03/NH4-N    P04    P04  TIDE    FILTER
1217/94    ii      .                                  0     0        0       875  47.450  0.664   21.610   0.303        0.967      0.340  0.027   ?         M
2/7/95    16.5    1.2   6.99  16500                  0      0       48        0    1.080   0.015  101.053  1.415        1.430     0.005  0.000   L          S
3/15/95    2 1      5           20200      6.83       0      0      0.25      0   3.520   0.049   25.160   0.352        0.402      14.798  1.169  H         FIF
4/1 8195    *26                                                                    1.818   0.025   24.225   0.339       06365      0.115  0.009   L        NOB1
5131/95    2 4      1 9                    8.02                                    0.047   0.001   17.544   0.246       0.246      1.909  0.151   L        NOB
6/6/95                                     8.35                            __                                                                      E     NO B/N
                                                                                  MEAN=  0.151              0.531      0.682              0.271



 DATE   SALINITY.TEMP   pH  CONDLUCT H20 DEPTH   Fr,  ED    Enleroccoci  (P    N03   N03-N    NH4    NH4-N  N03/NH4-N    P04    P04  TIDE    FILTER
12/7/94    1 5                                        0     0        6 0     245  48.900  0.685   27.330   0.383        1.067      0.660  0.052   ?         M
2/7/95    18.5      2           26000                9      9       8 5       0   0.800   0.011  1 22.920  1.721        1.732     0.076  0.006   L          S
3/1 5/95   15.5    4.5          17200      4.57      2.5   2.5       0        0   0.000   0.000  55.160   0.772         0.772      9.225  0.729   H         PF
4/1 8/95    2 5                                       0     0       0.5       0   2.156   0.030  21.911   0.307         0.337      0.232  0.018   L   RF1
5/31/9,5                                   7.55                                                                                                    L     NO B/N
6/6/95                                     8.21                                                                                                    E     NO B/N
                                                                                  MEAN=   0.181              0.796        0.977           0.201










Table 81). RI[ site,
       I
:W  [ E H~- ] i~ !:. Ji ?:[?:?:?:?:?:?:?:iiiii::::::?:iil ?:[?:ii?: um m~LL_ um m9[L m g/L um m0/L
  DATE SALINITY 1EMP pH CONDUCT H20 DEPTH FC    B3 Enteroccoci GTM NO3 NO3-N NH4 NH4-N NO3/NH4-N PO4 PO4 TIDE FILLER
 12/7/94 9 5 35 285 742;60 10.40 3.66 0.05 10.45                                                                                     0.39 0.03 ? M
 2/9/95 11 6.5 7.31 1'3500 TNTC 'I'NTC    203 130  202.85   2.84 698.59 9.78 12.62 0.22 0.02 L S
3/15/95 6.5 6.2 7500 3.24 230 220 2.5 0 81.66 1.14 6.33 0.09                                                              1.23 6.34 0.50 H FF
 4/18/95 4 7.75 6.5 26,75 0   1,413,31 19.79 142.65 2.00 21.78 112.22 8.86                                                                              L             FF
 5/24/95 10 8.16 1 1                                                     0             753,50 10.55 76.96 1.08 11,63 3,67 0.29 H FF
 6/6/95 7 8.45 1.5 1.5 2 0    146.35 2.05 28.52 0.40 2.45 0,18    0.01 E FF
                                                             MEAN= 7.79 2.23 10,03 1,62


  DATE SALINITY 'IEMP pH CONDUCT H20 DEPTH FC    B3 Enteroccoci CP NO3 NO3-N NH4 NH4-N NO3/NH4-N PO4 PO4 TiDE FILTER
 12/7/94 0 0                                                            350 10 M, NON
 2/9/95 15 7 17000                                       0      0 3 0 47,33 0.66   45.24 0.63 1,30 0.30    0.02 L S
 3/15/95 16 5,8 16100 4.27 0 0 0                                                 0 20.42 0.29 20.06   0.28                0,57 9,95 0,79 H                            FF
 4/18/95 13 0                                                   0 0 0 16.33 0.23 29.16 0,41 0.64 0.83 0.07 L FF
 5/24/95 8 H NO B/N
 6/6/95 5 8.25 1,101.82 15.43 110.95 1.55 16.98 0.19 0.02 E NOB
                                                             MEAN= 4.15 0.72 4,87 0.22

                                                                                                                                     (/3
  DATE SALINITY 'flEMP pH CONDLICT H20 DEPTH FC EC Enteroccoci CP                      NO3 NO3-N   NH4 NH4-N NO3/NH4-N   PO4 PO4 TiDE FILLER
 1217194      3                                           0     0       10      145 938.26 13.14 38.25 0.54 13.67 11.07 0.87 9                                        M
 2~9~95      11.5 8 14500 28 24 0 0 113.87 1.59 24.47 0.34 1.94 0.25 0.02 L S
 3/15/95 17.4 7 20500 7.41 505 470                                      3.5 0 75,34 1,05   19.72 0.28 1.33 14.06 1.11 H I:F
 4/18/95    ï¿½ 10 1,5 1,5                                                0.5 0 39.21 0.55 28,66   0,40                     0,95 0.60    0.05 L FF
 5/24/95 10 8.13 0                                              0        0 53,73 0,75 36.87 0.52 1.27 1,07 0,08 H FF
 6/6/95 10 8.51                                                                       123.39 1.73 58.63   0.82 2,55 0.18    0,01 E NOB
                                                             MEAN= 3,14 0.48 3.62 0.36


?';"': ':;[: ==============================
::..W..:~ .~.~ ~::[~..~.::4 ..........................................
  DATE SALINITY TEMP pH ~             CT H20 DEPTH FC EC Enteroccoci Gï¿½ NO3 NO3-N NH4 NH4-N NO3/NH4-N PO4 PO4 TIDE FILTER
 12/7/95                                                                                                                                                           NO WELL
 2/9/95 14 8 16500 18 11 61 0    65.96 0.92 112.81 1.58 2.50 10.25   0.81 L S
 3/15/95 13.1 8 16400 4.96 1.25 1 0 C 16,51 0.23 35.53 0.50                                                               0.73 31.89 2.52 H FF
 4118195 12 0.5 0.5                                                     0.5 0 134,12 1.88 73.95   1,04 2.91                          0.27 0.02 L FF
 5/24/95 7.18 H                                                                                                                                                     NO BIN
 6/6/95                                        7.6 E NO B/N
                                                             MEAN= 1.01 1.04 2.05 1.12

i~i;::~:~:; i/~:~iiiiiii~ii:ï¿½ii?~ii?:ii :::::::::::::::::::::::::::
  DATE SALINITY TEMP pH CONDUCT H20 DEPTH FC    B3 Enteroccoci GO NO3 NO3-N NH4 NH4-N NO3/NH4-N PO4 PO4 TiDE FILTER
 1217195 NO WELL
 2/9/95 4 10 6500                                        0      0      134 0 L S. NON
 3115195 11,5 8 14000 6.38 0                                    0 0 0 5.00 0.07 134.79 1.89 1,96 72.53 5.73 H FF
 4/18/95 2 0                                                    0       0,5 0           0,00    0.00 163.92 2.29 2,29 0,17 0.01 L FF
 5/24/95 2 7.47 0                                               0        0              5.54 0,08 167,41 2.34 2.42 18.97 1.50 H FF
 6/6/95 3 10,78 0                                               0       0        0     0,44 0.01 254.78 3.57 3.57 79,28 6.26 E FF
                                                              MEAN= 0,04 2,52 2.56 3,38









Table 8E. RP site.
................... I ................... I

 DATE SALINITY TEMP pH CONDUCT H20 DEPTH FC    B3 Enleroccoci CP NO3 NO3-N NH4 NH4-N   NOa/NHa. N P04 PO4 TIDE FILTER
1/16/95 10 10 11200 10 10 5 60 725.80 10.16 30.09 0.42 10.58 0.16 0.01 H M
2/9/95 7.5 8 10500                                   0     0 0 0 986.95 13.82 21.90   0.31 14.12 0.27 0.02 L S
3/15/95 5.5 7 7000 6.75 71 42 0 0 23.77 0.33 32.24 0.45 0.78                                                                    3.99 0.31 H FF
4/20/95 3 0.25 0                                                    0       0 50.37 0.71 26.19 0.37 1.07 0.67 0.05   L                                  FF
5/1 8/95 8 7.21 0 0                                                 0       0    0.32 0.00 39.20 0.55 0.55 4.91 0.39 L                                  PF
5/24/95 6 7.55 0 0 0 0 1.47 0.02 36.53 0.51 0.53 1.43 0.11 H FF
                                                         MEAN-- 4.1 7 0.43 4.61 0.1 5

.~E~,?~'t.: ......................................
 DATE SALINITY TEMP DH CONDUCT H20 DEPTH 1:13   B3 Enleroccoci 03 NO3 NO3-N NH4 NH4-N  NO3/NH4-N P04 P04 TIDE FILTER
1/16/95 13 8.9 16200 0 0 18 10 201.35 2.82 102.54 1.44 4.25 1.74 0.14 H M
2/9/95 11 6 7.19 13000 0 0 1 0 39.96 0.56 54.45 0.76 1.32 0.08 0.01 L S
3/15/95    6.8 5.4 8000 3.51                         0 0 0.5 0 9.97 0.14 14.23 0.20                                  0.34 12.84 1.01 H FF
4/20/95 3 0 0 0 0 1.42 0.02 29.51 0.41 0.43 0.37 0.03 L R::
-5/1 8/95 4 7.9 0                                           0        0 0 6.30 0.09 26.94 0.38 0.47 1.92 0.15 L PF
5/24/95 7 8.43 0                                            0       0       0    6.76 0.09 43.04 0.60                0.70 3.90 0.31 H FF
                                                         MEAN= 0.62 0.63 1.25 0.27

ii~i~'~'~ili'.~i~...:'~::?:111~111i?~iii::iiiiiiiiiiiiiil
 DATE SALINITY TEMP pH CONDUCT H20 DEPTH FC EC Enleroccoci CP NO3 NO3-N NH4 NH4-N  NO3/NH4-N PO4 PO4 TIDE FILTER
1/16/95 8.8 9.9 7.44 11500                           0 0 100 0 74.50 1.04 20.86 0.29 1.34 1.22 0.10 H M
 2/9/95 7.5 6 9000 O                                        O        0       0 105.72 1.48   34.34 0.48 1.96 0.08 0.01 L S
3/15/95 6.5 6 7800 7.82 0                                   0       0       0 8.87 0.12 224.64 3.14 3.27 1.02 0.08 H FF
4/20/95    '5 0 0                                                   0 0.25 226.09 3.17 703.97 9.86 13.02 1.42 0.11 L FF
5/18/95 6 8.3 0 0 ,    0 0 85.16 1.19 24.03   0.34 1.53                                                                         0.75 0.06 L PF:
5/24/95    5                               8.11 0           0 0 0 46.96 0.66 42.81 0.60 1.26 7.84 0.62 H FF
                                                         MEAN= 1.28 2.45 3.73 0.1 6

:i~i~;~i?~: :~iiiiiiiiii!iii!:~!i!
 DATE SALINITY TEMP pH CONDUCT H20 DEPTH FC    [C Enleroccoci 03 NO3 NO3-N NH4 NH4-N   NO3/NH4-N P04 P04 TIDE FILTER
1/16/95 16.9 9.1 20200 0 0 0 8 75.46 1.06 116.97 1.64 2.69 0.83 0.07 H M
 2/9/95 8 6 12000 0 0                                                O, 0 70.56 0.99 52.13   0.73 1.72                          0.04 0.00 L S
3/15/95 13.9 6,8 10000 7,19 O O 0 0 12.37 0.17 19.57 0.27 0.45 4.33 0.34 H PF
4/20/95 5 0 0 0.25 0 23,92 0,33   38.42 0.54 0.87 1.85 0.15 L IF:
5/18/95 8 7.55 0.25 0.25 0 0 21.74 0.30 57.61 0.81 1.11 14.26 1.13 L PF
5/24/95 1 0 7.38 0 0 0 2.29 0.03 58.40   0,82 0.85 7.32 0.58 H FF
                                                         MEAN= 0.48 0.80 1.28 0.38


 DATE SALINITY TEMP pH CONDUCT H20 DEPTH FC B3 Enleroccoci 03 NO3 NO3-N NH4 NH4-N NO3/NH4-N PO4 PO4 TIDE FILTER
1/1 6/95 7.7 10.9 10000 0 0                                         0       o    0.00 0.00 278.58  3.90 3.90 105.79 8.36 H M
 2/9/95 L NO B/N
3/1 5/95 8.5 8.2 9000 6.18 0 O 0 0 5.16 0.07 141.74 1.98 2.06 22.50 1.78 H FF
4/20/95 L                                                                                                                                            NO B/N
5/18/95 5 11.2 0 0                                                  0       0 0.81 0.01 367.24 5.14 5.15                       50.85 4.02 L             PF
5/24/95 6                                  8.65 0 0                 0             1.50    0.02 206.96 2.90 2.92 17.51 1.38 H FF
                                                         MEAN= 0.03 3.48 3.51 3.88









             I 
Table 8F. RC site.

,.hi]  ..~  i]E,,,.,  .l~.]. ,,.i. ii'     i!?  um m9/L um mg/L mg/L um mg/L
  DATE   SALINITY  TEMP   pH   CODUCT H20 DEPTH   FC    EC:  Enteroccoci  CP          NO3   NO3-N    NH4    NH4-N  NO3/NH4-N   PO4   PO4  TIDE  FILTER
1/16/95    8.8      11         .12000                  17              0       30   1071,87  15.01  1167.06  16.34       31.35      7.38   0.58   H       S
 2/9/95    9.5       8    7.09   12500                 57    50        6        50   139.22   1.95  1193.34  16.71        18.66     0.16   0.01   L       S
3/23/95    10                                9.21     7.5     7       2.75      0    31.01   0.43   837.91   11.73        12.16     1.16   0.09   L      PF
4/20/95     6                                          1      0       6.25      0   1285.62  18.00  644.29   9.02         27.02    61.17  4.83   L       PF
5/18/95 .6                                    9        7      7      0.25       0    217.84   3.05   612.42   8.57        11.62     5.59   0.44   L      Pr
5/24/95     6                           . 10.15    3.5        1       1.5       0    135.15   1.89   492.77   6.90        8.79      5.10   0.40   H      PFF
                                                                                    MEAN=  6.72             11.54      18.27             1.06

  DATE   SALINITY  TEMP   pH  CONDUCT H20 DEPTH   PC    EC  Enleroccoci  CP            NO3   NO3-Ni   NH4    NH4-N  NO3/NH4-N   PO4   P04  TIDE  FILTER
 1/16/95    9.3      11           12900                 0      0        0       0      5.47    0.08   236.61   3.31        3.39     31.62  2.50   H       S
 2/9/95                                                                                                 ::L   NO B/N
3/23/95                                       11I                                                                                                 L   NO B/N
_4/20/95    4                                                                         8.61    0.12   582.19   8.15        8.27      32.76  2.59   L    NOB
5118195     6                                13.5      0      0        0.       0     2.12    0.03   377.00   5.28        5.31     65.03  5.14   L       PF
5/24195     8                                9.12      0      0        0        0     0,62    0.01   216.89   3.04        3.05     65.85  5.20   H       PF
                                                                                  MEAN=  0.06                4.94       5.00             3,86


  DATE   SALINITY .TEMP   pH   CONDUCT H20 DEPTH   FC    EC  Enteroccoci  CP          NO3   NO3-N    NH4    NH4-N  NO3/NH4-N   P04   P04  TIDE  FILTER
 1/16195    4,7     10.5           6100               1144            TNTC    388  1003.48  14.05  1161.34  16.26         30.31    11.97  0.95   H        S
 2/9/95     7       8.5           9000                288   175    TNTC    333   73.47   1.03  1104.66  15.47             16.49     3.95   0.31   L       S
3123195   16.5                               6,35      10    10        0        0    722,19  10.11  1145.98  16.04       26.15    13.44  1.06   L        PFF
4/20/95    ï¿½5                                         4.75    3        1        0    79.57   1.11    10.39    0.15        1.26      8.95   0.71   L      PFF
5/18/95    .2                                7.9       1      1       1.25      0    125.12   1.75   320.16   4.48        6.23     53.34  4.21   L       PFF
 5/24195     8                                7.85    0.25  0.25    0.75         0    204.96   2.87   107.61   1.51        4.38     12.02  0.95   H       PF
                                                                                    MEAN=  5.15              8.98      14.14             1.36

  DATE   SALINITY  TEMP   pH  CONDUCT H20 DEPTH   FC    EC  Enleroccoci  CP           NO3   NO3-N    NH4    NH4-N  NO3/NH4-N   PO4   P04  TIDE  FILTER
 1/16/95   15.1    8.9            18300                 0      0        3       0    21.15   0.30  1303.97  18.26         18.55    39.71  3.14   H        S
 2/9/95    '14      11.8          30000                0      0        0        0    59.20   0.83  1097.87  15.37         16.20     0.42   0.03   L       S
 3/23/95     5                                 6       I       I      0.25       0    38.41   0.54   612,86   8.58         9.12     84.46  6.67   L       PF
4120/95 _6                                             0      0        0      __  128.06   1.79  1123.64  15.73           17.52     3,30   0.26   L      FF
 5/18/95     6                                6.95      0      0       3.5      o   1237.08  17.32  447.13   6.26         23.58    50.66  4.00   L        PF
 5/24/95     8                                4.3       0      0        0       0    169.19   2.37   465.77   6.52         8.89     87.45  6.91   H       PF
                                                                                    MEAN=  3.86             11.79      15.64             3.50







Tab~e 86. CSL site.
        I ....                                                           ..... _ _
                     ~~ t~~~$t~~~i ::::::~~~~~~~~::.~~~.                               urn     rn2~~u    m/L-9 urn  m /L     m9/j.   urn    IgL
 DATE   SALINITY TEWA  pH- CONDUCT H20 DEPTH   RT   ED            Entoroccoci   (P     N03    N03-N    NH-4    NH4-N   N03INH4-N   P04    P04  TIDE AILTER
1/3/95    0.3      6   6.83    161                  0   a             0        1 5    162.00    2.27    4.60      0.07        2.34      0.07   0.01    H        M
2/1 6/95   0.3     7   7.81    330        7.67       0       0         0         0     87.78    1.23      1.46     0.02       1.25       0.01    0.00    L      S
2/23/95    0.2     6            200       7.35       o       a         i         0     75.16   -1.05    22.50    0.32         1.3 7      0.02    0.00    L      FE
3/3 0/95    0                               7        0       a         0         0     66.86    0.94      2.15     0.03       0.97       0.93    0.a7    H1    FE
4/2 5195    0                                        0       0         0         0     71.99    1.01      3.67     0.05   I1.06         0-.05   0.00    H       FE
5/111/95    0                             3.94                                         78.95    1.11      1.59     0.02       1.13       0.18a   0.01    E   NOB
6/5/9 5    0                             3.97                    _____58.831   0.82                       6.613   0.09        0.92       0.16   0.01    E   NOB
                                                                                      MEAN=-   1.~20              8.89       1.11               0.02

 DATE   SALINTY TEMP  pH  CONDUCT H20 DEPTH   FO   ED             Enisroccoci   (P     N03    NO3-N    NH4    NH4-N   N031NH4-N   P04    P04   TIDE  FILTER
11/3195    0.3     5   6.65   236                   0       0         0         0    922.08   12.91    3.42       0.05       12.96      0,02    0,00    H       M
2/1 6/95   0.3    5.1   6.6    310a       4.04       0       0        76        1 2    98.67    1.38      2.67     0.04        1.42      0.01    0.00    L      S
2/2 3/95    0.2    5.2          255        3.8       0       0         0         0    1 45.98    2.04     1.67     0.02       2.07       0.02    0.00    L      FE
3/3 0/95    0  .0.83                                 0       0         0         0     86.48    1.21      1.75     0.02       1.24       0.10    0.01    H      FE
4/25/95    0                                         0       0         0         0     56.43    0.79      2.03     0.03       0.82       0.05   0.00    H       FE
5/1 1/95    0                             4.34       a       0         0         0     47.98    0.67    5.12       0.07       0.74       0.00    0.00    E      FE
6/5/9 5    0                             4.35       0       0         0       .0      43.33    0.61      0.23     0.00        0.61      0.06    0.00    E      FEF
                                                                                     MEAN=    2.80               0.03       2.84               0.00

 DATE   SALINITY TEM/P  pH  CONDUCT H21) DEPTH   AZ         A    Enteroccod   (P       N03    N03-N    NH4    NHA4.N   N03/NH4-N   P04    P04   TIDE  FILTER
1 /3/95    0.3    5.5  6.75    155                  0       0         0        30    357.53   5.01    39.36    0.55           5.56      0.02   0.00    H       M
2/1 6/95                                                                                                                                                  L  idn't sarr
2/23/95    0.2   '5.8           180o       6.6       0       0         0         0     62.29    0.87    31.91    0.45         1.32       0.02   0.00    L       FE                                              0
3/3 0/95    a                             6.67       0       0         0         0    156.34    2.19    11.31    0.16         2.35       0.04    0.00    H      FE                                               c
4/25/95  a                                           0       0         0       0.25   1 48.42   2.08    41.41    0.58         2.66       0.06    0.00    H      FE
5/11/95    0.                             3.16       0       0         0        0    1 44.04    2.02    44.27    0.62         2.64       0.03    0,00    E      FE
6/5/95     0                            .3.14       0       0         0         0    1 26.74    1.77    45.53    0.64         2.41      0.08    0.01    E      FE
                                  ____                                               ~~~~~~~~~~~~~~~~                        ~~MEAN=   2.32  0.50  2.82  0.00   _____

 DATE   SALINITY TElMP  pH  CONDUJCT H20 DEPTH   R3         AZ   Enleroccoci   (P      N03    N03-N    NH4    NH4-N   NO3INH4.N   P04    P04   TIDE FILTER
 1/3/9 5    0.31   6   6.74    240                   0       0    a            4 90   988.15  -13.83   18.33    0.26          14.09      0.60   0.05    H       M
2/1 6/9,5                                                                    ______ _L7 Idn'l sarr
2/23/95   0.2      6            285        7         1       1         0        0    110.40   1.55    24.59    0.34           1.89       0.19    0.01    L      FE
3 /3 0/95    0                            7.03       0       0        0.5      0.5   139.35    1.95   113.46    1.59          3.54       3.58   0.28    H       FE
4 /2 5/95   .0                                       0       0         0        22    23.48    0.33   1261.75  1 7.66         1 7.99    0.3 7    0.03    H      FE
5/1 1/95    0                             3.53     0.25    0.25        0        0    189,39    2.65   1270.28  1 7.78         20.44      0.09    0.01    E      FE
 6/5/9 5    0                        -    3.63       a       0         0         2    106.71   1.49   1259.25  17.63          19.12      1.685   0.15    E      FE
                                                                                      MEAN=-   3.63               9.21       12.85              0.09

  DATE   SALINITY TElMP  pH  OONDUICT H20 DEPTH   AZ         A    Enteroccoci   (P      N03    N03-N    NH-4    NH4-N   N03/NH4-N   P04    P04   TIDE  FILTER
 1/3/95    0.3    6.8  6.86   220                    0       0         0         0    142.99    2.00    5.43       0.08       2.08       0.1 8   0.01    H      M
2/1 6/95   0.3    1 0           380       6.77       0       0         0        0    1209.94  16.94    7.69       0.11        17.05     0.07   0.01    L        S
2/23195   0,2    7.8            318a   6.6           0   a             0        0      93.70    1.31    10.01l    0.14        1.45      0.43    0.03    L       FE
3/30/95    a                              6.6        0       0         0        0      86.29    1.21      2.15     0.03       1.24       0.11    0.01    H      FE
4/25/95    0                                         0       0         0        0      78.66   .1.10    2.77    0.04          1.14       0.1 5   0.01    H      FEF
5/1 1/95    0                             2.92       0       0         0        0      79.32    1.11     3.91     0.05        1.1 7      0.04    0.00    E      FE
 6/5/9 5    0                             2.77       0       0        0.25  . 0        78.90    1.10    1.88       0.03       1.13       0.1 2    0.01    E     FE
                                                                                     MEAN=-  3.54                0.07       3.611              0.01

  DATE      S     AIIYTElMP  pH  CONDUICT H20 DEPTH   AZ   FL     Enteroccocl   (P      N03    N03-N    NH-4    NH4-N   N03/NH4-N   P04    P04   TIDE  AILTER
 1/3/95    0.2      6  5.79    130                   0       0         0       1 70   254.30   3.56   1568.77    2.22         5.78       0.19    0.02    H      M
2/1 6/95                                                                                            -L  idn't san-
2/23/95    0.2     6            100       6.1        2       2         0        0      92.84    1.30    8.43      0.12        1.42      0.12   0.01    L       FE
3/3 0/95    a                             6.3        0       0         0        0      65.01    0.91     2.45    0.03         0.94      0.10   0,01    H        FE
4 /2 5/956    0                                      0       0         0        0      73.51    1.03     6.82     0.10        1.1 2     0.05    0.00    H      FEF
5/1 I1/95    0                            2.72       0       a         0    a          79.56    1.11     6.23     0.09        1,20      0.02    0.00    E      FEF
 6/I5 /9 5  0                             2.82       0       0         0         0     70.79    0.99    9.16       0.13       1.12       0.10   ,0.01    E      FE
                                                                                      MEAN--  1.4 8               0.4 5      11.93              00






Table 811. WRIJ site.


  DATE   SALINTY TEMP   pH  CONDUCT H20 DEPTH   FE              B,   Enleroccoci   0'       N03    N03-N    NH4    NH14-N  N03/NH4-N    P04    P04   TIDE  FILTER
 1/3/95                   7.07                        TNTC   TNTC        36        75     150.68    2.11   1250.83  17.51         19.62      1.54    0.12    H       M
2/16/95                                     6.91                                                                                                             L   NO B/N
 3/2/95                                      6.6                                                                                                              L   NO B/N
3/30/96                                     6.99                                                                                                             H    NO B/N
 4/6195                                      7.17                                                                                                             L   NO B/N
4/25/95                                                                                                                                                      H    NO B/N-
6/11/95                               .     7.75                                                                                                              E   NO B/N
                                                                                           MEAN:   2.11               17.51      19.62               0.12

  DATE   SALINT: TEMA   pH  CCNDUCT H20 DEPTH  P)   C                 Enteroccoci  CP       N03    N03-N    NH4    NH4-N  N03/NH4-N   P04    P04  TIDE  FILTER
 1/3/95     0.5      5    6.55    310                  1160    808       153       330    458.28    6.42    48.87    0.68         7.10       0.14    0.01    H       M
2/16/95                                                                                                                                                       L  didn' samp
 3/2/95     0.2      4            356        6.1 -                                                                                                            L   NO B/N
3/30/95                                     7.19                                                                                                             H   NO B/N
 4/6/95      0.      4            329        7.43     67.25    51        23         0     733.39   10.27   1'64.21    2.30        12.57      0.05    0.00    L       P
4/26/95                                                                                                                                                      H   NO B/N
5/1 1/95                                    8.07                                                                                                              E   NO B/N
                                                                                           MEAN=   8.34               1.49       9.83                0.01

  DATE   SALINITY PTR'   pH  CONDUCT H20DEPTH           AR   D        Enteroccoci   CP      N03    N03-N    NH4    NH4-N   N03/NH4-N   P04    P04   TIDE  FILTER
 113/95    0.9    6.5   6.64   6500                     0       0         0        13    1370.67   19.19   37.30    0.52          19.71      0.06    0.00    H       M
2/16/95    0..3    10   5.91    550         5.65        7       3         0        0      20.21    0.28   126.40    1.77          2.05       0.02    0.00    L       S
 3/2/95     0.7   a       5.22    560        5.52       0       0         0         0     1263.62   17.69   34.13    0.48         18.17      0.04    0.00    L       A:
3/30/95      0                              5.67        0       0         0         0   1284.02   17.98   34.43    0.48           18.46      0.07    0.01    H       AF
 4/6/96      0      6.9           339        5.87       0       0         0         0    1488.31   20.84   74.40    1.04          21.88      0.07    0.01    L       PC
4/25/95      0                                          0       0         0         0     1246.49   17.45   81.55    1.14         18.59      0.04    0.00    H       A:
 5/11195      a                              6.39       1.5     1.5        0        0     1325.28   18.55  1129.83  15.82         34.37       4.27    0.34    E       A:
                                                                                           MEAN=  16.00               3.04       19.03               0.05

  DATE   SALINIY TBRP   pH  CCNDUCT H20 DEPTH    FC   ID             Entoroccoci  0'        N03    N03-N    NH4    NH4-N  N03NIH4-N   P04    P04   TIDE  FILTER
 113/95    0.9    6.2   6.68   7000                    18       8         5       240    199.23    2.79   168.75.  2.36           5.15       0.22    0.02    H       S
 2/161/95                                                                                                                                                     L  didn't samp
 3/2/95    0:5       5    6,18    462    . 5.81        390    205        185        0       1.14     0.02   219.30   3.07         3.09       12.05   0.95    L       A:
 3/30/95    0D                               5.98       330    210         0        7       0.78     0.01   224.42    3.14         3.15      21.44   1.69    H        A:
 4/6/95      0      4.9           500        6.2       350    200        20       6.75      5.38     0.08   1069.12  14.97        15.04      7.07    0.56    L       A:
 4/25/95  a                                            1055    950         1      29.25    1.96      0.03   1068.35  14.96        14.98      14.46   1.14   H         A:
 5/9/95      0                                                                             8.37      0.12   1245.79  17.44        17.56      2.60    0.21    H      NOB
 5/11195     0                               6.75      1380   1090         0        0       2.29     0.03    51.32    0.72         0.75       0.16    0.01    E       A:
                                                                                           MEAN=   0.44               8.09       8.53               0.65

   DATE   SALINITY TMW   pH CONDUCT H20DEPTH    A)               B    Enleroccoci   CP       N03    N03-N    NH14   N114-N  N03/NH4-N   P04            P04   TIDE  FILTER
  1/3/95                   6.98                        TNTC   TNTC       420        0       1.15     0.02   1377.67  19.29        19.30       1.17    0.09    H       M
 2/16/95                                                                                                                                                      L  didn't samp
 3/2/95     0.5      6    6.34   *458        7.24      35.5   29.25      12         0      0.00      0.00   354.34    4.96        4.96       1.25    0.10    L       A:
 3/30/95     0                               7.26                                           0.03     0.00   349,54    4.89         4.89       1.79    0.14    H     NOB
  4/6/95      0       5            382        7.68     16.25   6.25      2.75        0      3,47      0,05   1574.46  22.04       22.09       0.13    0.01    L       A:
 4/25/95      0                                        2.75    2.25        3        0       2.09     0.03   1346.23  18.85        18.88      0.47    0.04    H       A:
 5/11195      0                              8.22                                           0.85     0.01   1344.68  18.83        18.84      0.02    0.00    E    NOB
                                                                                           MEAN=   0.02              14.81       14.83              0.06

   DATE   SALINItY TEMP   pH  CONUWCT H20DEPTH  EC   EC               Enteroccocl   CP      N03    N03-N    NH4    NH4-N   N03/NH4-N   P04    P04   TIDE  FILTER
  113/95    0.3       6    6.58    310                   0       0         0       160    100.79    1.41      3.61      0.05       1.46       0.12    0.01    H       M
 211 6/95                                                                                                                                                     L  didn't samp
  3/2195     0.4      5    5.94    306       5.25        0       0         0        0      785.89   11.00    2.11       0.03      11.03       0.11    0.01    L       A:
 3/30/95      0                              5.36        0       0        0        1.5    738.43   10.34    1.35       0.02       10.36      0.11    0.01    H       A:
  4/6/95      0      4.9           295        5.58       0       0         0         1     302.66    4.24    7.01       0.10       4.34       0.06    0.00    L       A:
 4/25/95     0                                           0       0        0         0      229.42    3.21    11.73    0.16        3.38       0.07    0.01    H       A:
 5/11195     0                               5.94        0       0        0        0.25   305.90    4.28    7.30       0.10       4.38       0.02    0.00    E       A:
                                                                                           MEAN:   5.75               0.08       5.82                0.01








Table 8L KDB site.               I       III I


 IDATE  ~SALINITYJ TEMP I pH  I CNDLCTI H20ODEPTH   FU   ED          Enleroccoci   CP  I  N03      N03-N    NH4    NH4-N   H 03/NH4-N   P04 I P04  ITlSE FILTER
 1/1995     0.2       5.5  16.27 1  220        0            0             a          10  526.25    7.37    52.83    0.74        .8.11-      0.071  0.01    7       M
 3/7/95 I0.2  I5.2              I220  I5.32             0       0         0   -    0   11163.04   16.28   16.58    0.23          16.51      0.03 I0.00    L        FFA
31231951    0    I              I            4.985      0       0        0    I        1203.67    2.85    12.33    0.17  . 3.02             0.071  0.01    L I   A
4/4/95 I 0    I                 I            5.48   a          0         0       0.25 I169.93    2.38    44.65    0.63           3.00      0.06 I0.00    L I FF
5/2/95      o                                5.83      0       0         0       0.25 I339.31    4.75    33.96    0.48           5.23      0.04 I0.00    L I   A
5122/951    0    1                           5.62       0       0        0       0.25 I236.87    3.31    36.42    0.51           3.82       0.8   0.08    H       FFA
                                         I  I                                         I ~~~~~~ ~~~~~~~~~~                       ~~~~~~~~MEAN=    6.16  0.46  6.62  I0.02 

      DT  SALMINYI TEMIP IH I  ICONCIC-T H20 DEPTH   TV   Er,   Entaroccoci   0'           N03     N03-N    NH4    NH4-N   N03/NH4-N   P04 I P04   TIDEJ ILPTER
 1/9/51           I                                                                                                                                         ?    lidnl samj
 3/7/95 I         I      I      II                                                                                                               IL  Jidnt sarml
3/231951                        1                                                                                                                           L  Jidnl saml
4/4/95 I 0   I           I      I5.9                   0       0         0      14.25  631.92    8.85    10.05    0.14           8.99    I0.04 I -000   L         FF
5/2/95     0    I       I      I6.22                   0       0         0        2     145.24    2.03    6.23    0.09           2.12    I0.03 I0.00    L         AZ
5/22/951    0    I       I      I            6.17       0       0        0       2.25    81.69      1.1 4    8.45    0.12        1.26    10.761  0.06   H         FF
                         I     I                                                        MEAN--  4.01                 0.12       4.12    I          0.02

 -DATE  lEALiNYFIl TEMP I pri  IcoNDUCT H20 DEPTH   TV         TV   Enteroccoci  CP       N03      N03-N    NW4   NH4-N   N03/NH4-N   P04 IP04   TME   FLTER
 1/9/95 I0.2   I5.2  I6.27 I251  I860    615                                      115   1 184.45    2.58    79.82    1.12        3.70       0.07 I0.01    7        M
 3/7/95 I0.2          5            328   I5.65          75    71.5        0        0   I382.50    5.36       8.88    0.12        5.48       0.03 I 0.0    L        AZ
3/23/951    0            I      I            5.57      1.5    1.5        0       0.25 I488.65    6.84    15.19    0.21           7.05       0.03 I  .0     L      FF
4/4/95 I 0   I           I      I        I6.04         0       0         0       0.5  I266.12    3.73    49.52    0.69           4.42      0.04 I0.00   L         RF
 5/2/95 I 0   I          I       I           6.26       0       0         0       0.75 I67.36       0.94    28.41    0.40         1.34      0.02 MO.0       L      FF
5/22/951    0    1       I               I  6.23        0       0        0         0       123.53    1.73    47.45    0.66       2.39       0.75 MS.0      H      PF
                            I I  I  I   I                                             I ~~~~~~ ~~~~~~~~~~                      ~~~~~~~~~~~~MEAN=    3.53  0.53  4.06  I0.01

    -D~t'j   10 I  TEMP I pH  I CONCSCTI H2ODEPTH   TV         TV   Enleroccoci   0'      N03     N03-N    NW4    NH4-N   N03/NH4-N   P`04 IP04  TiCE  FILTER
 11/9/951         I      I      I        I                                      I      I                                                                        NO B/N
3/7/95 1  0.2   I  6   I       1 320   1  6.04         0       0         0    I0   11414.94   1 9.81    3.49    0.05            19.86   OM3   0.00    L           FF
3/23/951    0    1       I      I        I   5.73       0       0        0    I         11268.80   17.76    7.65    0.11         1 7.87     0.06 I 000    L       AZ
4/4/95 I 0    I         I       I            6.18a     0       0         0    I        11344.48   18.82   28.42  CIA0           19.22      0.08 I 0.1    L        AZ
5/12/85 a                                    6.46                              I        1247.32   17.46   36.75    0.51         17.98      0.01 I0.00    L    NOB8
5122/951I   0    1       I      I        I   6.4                               I        131 7.87   18.45   28.40    0.40         18.85      0.77 I0.06    H    NOB8
                                         I  I                                  I      I ~~~~~~~~~~~~~~~~~                      ~~~~~~MEAN=    18.46  0.29  18.75  mi.0

  DATE  ISALINITY I TEMP I pHi  ICONDLCTI H20 DEPTH   TV        TV  I Erueroccocil  C'  I  N03     N03-N    NW4 I NIH-N   N03/NH 4-N   P04 IP04   TIDE  FILTER
 ''9/951          I           I           I                 I       I           I      I                   I       I         I            I      I        I?INO B/N
 3/7/9 5    0.8      51         17201          4         01         I    0    a  0 11656.88 23.2013.0810.041    23.24    10.0410.00  ILl    F
3/23/951    0   I                            3.48       0   I  0   I    0    I0   1 1585-38   22.2014.1110.061    22.25    10.0510.00  ILl    F
 4/4/951    0   I        I      I        I 3.98         0  I  o           0    I0   11823.24   25.53  115.041   0.21  I 25.74    10.071  0.01  ILl 
 5/29 51    0   I        I                                            0 I                1100.43   15.41111.1710.191             15.'56  0o.12Io'o1  ILl    A
5/22/951    0   I        I      I            4.46       0   I  0   I    0      I 0.251 11378.24   19.30  113.291   0.19  I   19.48    10.791  0.06 IH  FFA
                            [ I  I  I   I                  I       I          I       I~~~~~~~~~~~~~             ~~~~~~~~~~~~~MEAN=    21.12  10.13   I 21.251  0.021 

      DATE  [SA.INITY I TEMP I rf-fI IC0NDLZTINH200DEPTH   TV   I  T lEnteroccocil GI   I  N03     Nb3-N  I NPA  I NH4-N I N03/NH4-N I P04 I P04 I1105E1 FILTER
 1/9/95 I0.3   I6.1  I6.27 I  295   I0                          0 G                5   11397.04   19.56   22.23 I0.31            19.87   I0.11 I0.01 I     I   MI
 3/7/95 I0.2   I5.5 I              300   I  5.53        7.5    7.25 I1.75   I0   11381.73   19.34    5.39  I0.08                 19.42    I .3 I0.01 IL I   A
3/23/951    0 o                              5.24       0       0        0    I0.25  11479.30   20.71    3.58 I0.05             20.76    I0.10 I0.01 IL I   A
4/4/95 I 0    I          I      I        I 5.8         0       0         0    I0.5  11625.20   22.75   1 7.441  0.24            23.00    10.0710.01  IL I   A
 5/2/95 I                                    6.23                   I                    1291.66   1 8.08 I15.08 I0.21           18.29    I .05   0.00 IL    NOB8
5/2 2195 I 0   I         I      I        I 6.22                     I                   1351.58   18.92-  41.74 I0.58            19.51    I0.77 I 0.06 IH    NOB8
                                   I  I  I  I                      I          I       I~~~~~~~~~~~~              ~~~~~~       ~~~~~MEAN=    1 9.90  10.25  2 0.14    I  10.021

      DATE..1SALJN~I1   TEMP I pHi ICONDCLTI H20 DEPTH   TV,  ED    I Enteroccocil  0`1I  N03      N03-N    NW4  I NH4-N   N03/NH4-N IP04 IP04   TOE   FLTER
 1/9/9 5    0.3   I6   16.27    212  I0                         0 o                0   11360.82   19.05    1.~59 I0.02           1 9.07    I 005 I0.00 I 7         M
 31719 5    0.5       5            410   I4.75           1        I       1    I  0   11401.56   19.62    8.841   0.12           19.75    10.05 I0.00 IL           AZ
3/23/951    0    I       I      1            4.19       0       0   I    0        1.5  11702.88   23.84   1 3.441  0.19          24.03    I0.04 I0.00 IL          AZ
 4/4/95 I 0    I          I     I         I4.71         0       0   I     0     I0.25  11947.92   27.27   1 79.58   2.51         29.79    I0.06 I0.00 IL           AZ
 5/2/9 5     0   I       I      I        I 5.22         0       0  -      0    I0   11461.00   20.45   21 9.86   3.08            23.53   I0.041  0.00 IL           AZ
5/22/9 5     0    I      I      I        I 5.2                      I          I       II                                                        IH   NO B/N
                     . *1  I   I        I                          I          I       I~~~~~~~~~~~~~~~~~                       ~~~~~~~ ~~~~~~MEAN-- 22;05  1.19  23.23    I  0.901

  DATE  ISALINITY I TEMP I cH  I CONCLIETINH20 DEPTH   TV       TV  IEnteroococil  C'  I  N03 :N03-N    NW4   NH4-N   N03/NH4-N I P04 I P04   TIDE  FILTER
 1/9/9 5          I      I      I        I           I              I                I  I                                   I             I      I         TNO WELIL
 3i7/951   0.5   I 4.8  I       I 442   I5.59   I  0            0-  I    0      I  0   1 1655.28   23.17    3.34    0.05  I 23.22    10.41  0.00 IL I R'
3123/951    0    I       I      I        I 5.06   I  D          0   I  0.75   I  1   1 1 659. 90   23.24    3.54    0.05  I 23.29    10.071  0.01 IL    FIFA
414/951    0    I        I      I       I 5.7    I0            0         0     I0   11797.84   25.17    9.76    0.141    25.31    l0os6  0.00 ILl    F
 5/2/951    0    I        I     I        I 6.31   I0            0   I     0     I0   11526.21   21.37   12.10    0.1 7  I 21.54    I0.05l0.00  ILl    AZ
5/221951    0   I        I      I        I 6.1    I  a                   0     I0.25 11748.23   24.48   1 6.1 3    0.23  I 24.70   10.771  0.06 IH I   A
                                   I  I  I  I       I              I          I       l~~~~~~~~~~~~~~~~~~ ~~~~MEAN=    23.48  0.1 3  23.6i    I  0.021 

      DT VsALuNmiY TEMP I M-I  IENDICJTINH200DEPTHNI   TV       Er, IEnleroccoc!l0   I CP  N03     N03-N    NWA    NH4-N I N03/NH4.N IP04 lP04   TIDEI FILTER
 119/951          I      I                                                                                                                                    NO WELL
 3171951                                      4.8            I                                                                                             L NOB/N
3123/9 5          I                        1.671            I       I                                                                                      LNO B/N
 4/4/941                                     4.481           I      I                                                                                      LNO B/N
 5/219 5          I                         10.041          I  NC               IB                                          II                   I        IINO/
5/22/9 51                                I  5.11                                                                                                           H I                  NNO B/N










                                                                                        31










Table 8J. FDC site.

      DATE   SALINI    TEMP    pH    ONDUCT H20DEPTH  Enteroccoci   CP                 NO3    N
 DATE  SALINITY  TEMP    pH  CONDUCT H20 DEPTH  PC           ED  Enteroccoci  CP       N03    N03-N    NH4    NH4-N  N03/NH4-N  P04   P04  TIDE  FILTER
1/9/95    0.5      3.8            408                 0      0                 160                                                                  N/A  M, NON
3/9/95                                       6                                                                                                      N/A  NO B/N
4/6/95                                      6.15                                                                                                    N/A  NO B/N
5/2/95                                      6.43                                                                                                    N/A  NO B/N
5/22/95                                     6.28                                                                                                     N/A . NO B/N
6/5/95                                      6.54                                                                                                    N/A  NO B/N


 DATE  SALINITY  TEMP    pH  CONDUCT H20 DEPTH   FC          EC  Enleroccoci   CP      NO3    NO03-N    NH4    NH4-N  N03/NH4-N   PO4   P04  TIDE  FILTER
 1/9/95    0.9      4.3   6.61    780                  0      0                 25   2003.05  28.04   1324.10   18.54        46.58     0.78   0.06  N/A       M
3/9/95    0.8      3.8            690       4.42     0.5    0.5       0         0     176.21    2.47     7.71     0.11       2.57     0.15   0.01  N/A    PF
4/6/95                                      4.82                                                                                                    N/A  NO B/N
5/2/95                                      5.22                                                                                                    N/A  NO B/N
5/22/95                                     5.15                                                                                                     N/A  NO B/N
6/5/95                                      5..23                                                                                                   NIA  NO B/N
                                                                                      MEAN=   15.25               9.32      24.58            0.04

  DATE  SALINITY  TEMP    pH  CONDUCT H20 DEPTH   FC          ED  Enleroccoci   CP      NO3    N03-N    NH4    NH4-N  N03/NH4-N   PO4   PO04  TIDE  FILTER
 1/9/95    0.5      6     6.61    600                  0      0                  0     83.98    1.18    15.56    0.22         1.39     0.16   0.01  N/A       M
 3/9/95    0.8       6             570       5.59      0      0        0         0    1849.10  25.89   368.64    5.16        31.05     0.05   0.00  N/A      FF
 4/6/95                                      6.03                                                                                                    N/A  NO B/N
 5/2/95                                     6.54                                                                                                     N/A  NO B/N
5/22/95                                     6.05                                                                                                     NIA  NO B/N
 6/5/95                                      6.39                                                                                                    N/A  NO B/N
                                                                                      MEAN=   13.53               2.69      16.22            0.01

  DATE -SALINITY  TEMP    pH  CCONDUCT H20 DEPTH   PC  EC   Enteroccoci   CP            NO3    NO03-N    NH4    NH4-N  NO3/NH4-N   PO4   P04  TIDE  FILTER
 1/9/95     1       1.8   6.61   1120                  0      0                 50                                                                   N/A      M
 3/9/95    0.4      2.5            320       5.1                                                                                                     N/A  NO B/N
 4/6/95                                      5.21                                                                                                    N/A  NO B/N
 5/2/95                                      5.66                                                                                                    N/A  NO B/N
5/22/95                                     5.33                                                                                                     N/A  NO B/N
 6/5/95                                      5.75                                                                                                    N/A  NO B/N


  DATE  SALINITY  TEMP    pH  CONDUCT H20 DEPTH   R:          EC  Enleroccoci   CP      NO3    N03-N    NH4    NH4-N  N03/NH4-N   P04   P04  TIDE  FILTER
 1/9/95    0.2      7     6.61    410                  0      0                 0       1.45     0.02     1.94     0.03       0.05     0.82   0.06  N/A      M
 3/9/95    0.5      5.8            435       5.32     0.25   0.25      0        0       5.10     0.07     1.08     0.02       0.09     0.09   0.01  N/A    FF
 4/6/95     0        6             459       6.2       0      0        0         0      0.00     0.00     1.34     0.02       0.02     0.03   0.00  N/A    FF
 5/2/95     0                               6.29       0      0        0         0      4.88     0.07     2.74     0.04       0.11     0.17   0.01  N/A    PF
5/22195    0                                 6.1       0      0        0       0.25    1.05     0.01     2.77      0.04      0.05      0.80   0.06  N/A    FF
 6/5/95     0                                6.57      0      0        0        0       5.01     0.07     0.72     0.01       0.08     0.12   0.01  N/A    PF
                                                                                       MEAN=    0.04               0.02      0.07             0.03







Table 9. Ranges of contaminant concentrations from all wells at each site

                                                                                                           Average
 Site  Salinity Fecal coliforms Enterococci  C. perfringens       Nitrate     Ammonium    Phosphate   N03/NH4
        PPT    CFU/100 ml   CFU/100 ml   CFU/100 ml               mg/L           mg/L           mg/L         ratio*

                                     River       Street
REH  3 to 15       0 to 29           0           0 to 700     <0.01 to 15.3  0.56 to 20.1  <0.01 to 0.97       1.8
RET   0 to 4       0 to 21        0 to 40        0 to 60      <0.01 to 3.0   0.23 to 18.9  <0.01 to 0.62      0.16
RB   4 to 26      0 to 65        0 to 830       0 to 875      <0.01 to 0.7   0.25 to 1.7   <0.01 to 1.2      0.29
 RH   2 to 17     0 to 500        0 to 200       0 to 285     <0.01 to 19.8  0.05 to 9.78   0.01 to 8.9        3.3
 RP   3 to 17      0 to 71       0 to 100        0 to 60      <0.01 to 13.8   0.20 to 9.9   <0.01 to 8.4      2.4
 RC   2 to 16    0 to 1140        0 to 250       0 to 390      0.01 to 18.0   0.15 to 18.3   0.01 to 6.9      0.38

                                         In      Town
CSL      0         0 to 2         0 to 76        0 to 490     0.33 to 16.9  <0.01 to 17.8 <0.01 to 0.28       27.6
WRH  0 to 1       0 to 1380       0 to 420       0 to 330     <0.01 to 20.9  0.02 to 22.0   <0.01 to 1.7      13.8
KDB   0 to 1      0 to 860         0 to 2        0 to 115      0.94 to 27.3    0.02 to 3.1   <0.01 to 0.08    69.7
FDC. 0 to 1        0 to 1            0           0 to 160      <0.01 to 28   0.01 to 18.5  <0.01 Oto 0.06     2.9
* The ratios for mean nitrate divided by mean ammonium levels for each well were calculated, summed,
and averaged for each site.





Table 10. Hampton Harbor shoreline survey on 6/2/95, at
River St. and Cross Beach Rd., Seabrook, NH: Fecal coliform levels.


House #         Location          Description   Map #  FC/lOO1ml

   14          14 River St.        Seepage-1      SB 1      <5
   14          14 River St.        Seepage-2      SB 1      <5
   30          30 River St.      Gray water pipe  SB 1    Bkgd *
   31          31 River St.      Septic seepage   SB 1      60
 36/37  Between 36 & 37 River St. Septic seepage   SB 1   -200000
  NA       Harbor at River St.    Harbor sample   SB 1      <5
  NA      Rocks at Yankee Coop   Groundwater   SB 1         1

* Bkgd- Background growth interference extensive; couldn't read








Table 11. Concentrations (per 100 ml) for bacterial indicators
in surface water around study sites.
SITE: 1 (REH DOWN STREAM)
 DATE   SALINITY TEMP. Fecal coliform  E. coli  Enterococci C. perfringens
 6/8/95     29.7       16         45.5         44.5       44.5           .8
6/19/95      27       29.5        61.5         61.5      103.5         18.25
6/22/95      29        25          47          43         27             4
         Geometric mean =          51           49        50             8

SITE: 21(REH UP STREAM)
 DATE   SALINITY TEMP.  Fecal coliform  E. coli  Enterococci C. perfringens
 6/8/95     29.7       16          34           34        48.5          6.5
 6/19/95      28       23.4        390          370       247.5          2.5
 6/22/95      28        21         305          290       38.75          9.5
         Geometric mean =         159          154        77             5

SITE: 3 (CAUSEWAY STREET BRIDGE)
 DATE  SALINITY TEMP.  Fecal coliform  E. coli  Enterococci C. perfringens
 6/8/95       1        18         535          465       206.5          25
 6/19/95      0        23.8        800          490       43.75         17.5
 6/22/95       5        21         605          340        36             6
         Geometric mean =         637          426        69            14

SITE: 4 (TIDAL CREEK BEHIND HUBERT)
 DATE   SALINITY TEMP.  Fecal coliform  E. coli  Enterococci C. perfringens
 6/8/95       0       17.5        460         397.5       168           2.5
 6/19/95      0        28.1        830         407.5      151.2         6.75
 6/22/95      2        20.5        670          340      101.25           8
         Geometric mean =         635          380        137            5

SITE: 5 (CSL DOWN STREAM)
 DATE  SALINITY TEMP.  Fecal coliform  E. coli  Enterococci C. perfringens
 6/8/95       0        18         134.5        126.5       60           33.5
 6/19/95      0         25         545          460        144          83.5
 6/22/95       0       23.7        795          785        95            46
         Geometric mean =         388          357        94            50

SITE: 6 (RT. 286 BROWN'S BRIDGE)
 DATE  SALINITY TEMP.  Fecal coliform  E. coli  Enterococci C. perfringens
 6/8/95      26        14         26.5          24         15            4
 6/19/95      28        21          62          42.5       13.5         2.25
 6/22/95      28       18.9         9            9        9.25          3.75
         Geometric mean =          25           21         12            3



                                              35










SITE: 7 (CSL UP STREAM)
 DATE   SALINITY TEMP.  Fecal coliform  E. coli  Enterococci C. perfringens
 6/8/95        0       15.5         255          230       136.5          44.5
 6/19/95       0        18.5        400          340         430          TNTC
 6/22/95       0        14.5        380           370      468.75          140
          Geometric mean =          338          307        302            79

SITE: 8 (KDB DOWN STREAM)
 DATE   SALINITY TEMP.  Fecal coliform  E. coli  Enterococci C. perfringens
 6/8/95        0       20.5         365          330        233             8
 6/19/95       0        27.3        120           110      496.25          7.75
 6/22/95       1         26         0.5           0.5       3040            16
          Geometric mean =          28            26        706            10

SITE: 9 (KDB UP STREAM)
 DATE   SALINITY TEMP.  Fecal coliform  E. coli  Enterococci C. perfringens
 6/8/95       0        20.5        285           240       197.5            6
 6/19/95       0        26.8        205           155        605          12.75
 6/22/95       0        25.3        0.4           0.4        470           4.75
          Geometric mean =          29            25        383             7

SITE: 10 (END OF FOREST DRIVE)
 DATE   SALINITY TEMP.  Fecal coliform  E. coli  Enterococci C. perfringens
 6/8/95
 6/19/95       0        16.5       287.5         147.5     103.75           8
 6/22/95       0         15          95          72.5        77             2
          Geometric mean=           165          103         89             4

SITE: 11 (FOREST DRIVE POND)
 DATE   SALINITY TEMP.  Fecal coliform  E. coli  Enterococci C. perfringens
 6/8/95       0        19.5        184.5        176.5        87           14.5
 6/19/95       0        25.4       66.25         52.5        35            1.75
 6/22/95       0        22.5         42           42          4             1.5
          Geometric mean =          80            73         23             3

SITE: 12 (RT. 1 CULVERT))
 DATE   SALINITY TEMP.  Fecal coliform  E. coli  Enterococci C. perfringens
 6/8/95       0         23         255          232.5       198            29
 6/19/95       0        28.1       252.5         202.5      46.25          7.75
 6/22/95       0        25.9        52.5          50          19           13.5
         Geometric mean =          150          133         56            14




                                Figure 1. Focus areas With Selected study sites (2-3 CAPITOL
                                  LTTERS) and surface water-sample stations (11)







                                   O~~~~~ I -


                                                                                                                    F/~~~~~~~~~~~~

                           J/   .                                  t.+.... C21linpr




    Wille I,             Crn D-- Tcrailer                              0 (4, 51'A 1f1.Y 2I
                                                                            Scwau~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~%,e<7i ....... ..
                                      :cor~~~~~~~i~~~r~~~;~ag  1r~\akDps," (l'     ~~.~~
                                               e~lroo






                        ij~~~~~~~~~~~~~~~~~~~~~~U          0a- I  till            /'r10
                                        ~~eahrook  / I    s ~~~~~~~~~~~~9'                  ...                                    ..   .   Irn....

                                                       '~~~ ~~~~~~~~~~~~~~~~~~~~:C                                  RPLdh
                C.~~~~~~~~~~~~~~~~~~~~~~~~~~~~Sall)io                                                                            n Rock
                          I iuiilu'r  I ~'  1  A V)~ .    ~~                      , ..\$      ''                                 /    lc~~i'
                                                                                               Iht itt    . .~~~~BL
                             ~~~~~~~~~~~~~~~~~~~~~~~~~~~I1iK.                               ~UFlorl)'V ~                  f~t
                                         -   7.. It~> \  ./.  ~'~Si dClLIJoAr1 ~       ~    1.jb17~M.\./ak/~~.~ a
        V'C      t   i                         caFo                .p                                           t   I
                                 15      )                       )    ~ ~          I Ifl(C~fl~i  ~             ~                    1103'

                                  X~~~~~~~~~~~~~~Th~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~ Y                                     C   I~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~i
                                          rl3J...                3X     ~     ~                      K~   ~       I)jqiScabooltI~e4
           Hod~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ C                                                      nd
                      ~~~~~~ -U                                      7...~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~'
                                                                       4 ~ ~ ~   ~ ~ ~ ~ '~_



                                                                                                                                                    "I~~~~~~~~I




           SCALE  1:25 000                                            2_0_0_
11iiiWilli  ON  iIIIE MAV 11ENIiiIllIS  NTS  250 METE-115 ON  TI iE   t ND -i:.-.-  I G. 11  -. Iï¿½011i-i.,= --11)_ ï¿½ -.. .--   ~h7T777
                   C~~l'iIOUI  !NI~~~~r/~~/AI .  0lC~~~l'-Wl.  i.-F-Iinn                                 ariiiin                    /





      Figure 2.  Lot layout, EDA  location, groundwater flow direction and
     installed wells at REH  AND  RET.

       AREA = 50,000 SQ.FT



      HaE3T CMS. TM


























   PROPERTY BOUNDARY,(APPROX.).
                                                                .X



















STRUCTURE                   0i/////

EFFLUENT DISPOSAL AREA (EDA) '      ï¿½#}

WETLAND EDGE

NOTE: BOUNDARIES AND OTHER DETALS ....
DEPICTED ON THE PLAN ARE ONLY
 - -vA TF KIn C Rr ' '1T - n BF     cy  F1' - 38



     Figure 3.  Lot layout, EDA  location, groundwater flow direction and
     installed wells at RB.



                       AREA = 5,000 SQ.FT. +/-




             * (/'STRAND LINE/.
                 VEGETAnONI  /
               HGHEST OBS/
               TIDE













                                        .3
                                                            /














LEGEND:

PROPERTY BOUNDARY (APPROX.) ï¿½    .   _

STRUCTURE

EFFLUENT DISPOSAL AREA (EDA)

WETLAND EDGE                       . -

NOTE:: BOUNDARIES AND OTHER DETAILS
DEPICTED ON THE PLAN ARE ONLY     SCALE 1" = 201
APPROXIMATE AND CARE SHOULD BE
EXERCISED IN THEIR USE.                                                             39



    Figure 4. Lot layout, EDA location, groundwater flow direction and
    installed wells at RH.



                                        AREA= 6000 SQ.FT. +/-







             /








                      '~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ '



                                                           -,.~~~~~~~~~~.
                                          cbutter-s 
                              ; @<y~~~ten (cpro x.l 

                                                        ~~~~~.~~~~-/X
                                                             %~ ~ ~~


LEGEND:                                                                          -/

PROPERTY BOUNDARY (APPROX.)      .    -

STRUCTURE                    //////
EFFLUENT DISPOSAL AREA (EDA)  ti I

WETLAND EDGE                       .

NOTE: BOUNDARIES AND OTHER DETAILS
DEPICTED ON THE PLAN ARE ONLY     SCALE 1" = 20'
APPROXIMATE AND CARE SHOULD BE
EXERCISED IN THEIR USE.



                                            anr






    Figure 5.  Lot layout, EDA  location, groundwater flow direction and
    installed wells at RP.



                   AREA = 12,000 SQ.FT +/-








                       //



                                        /








                                                                      IEST eS. TDE
                                                                      ON WALL







LEGEND:

PROPERTY BOUNDARY (APPROX.)

STRUCTURE

EFFLUENT DISPOSAL AREA (EDA)   F, 1

WETLAND EDGE

NOTE: BOUNDARIES AND OTHER DETAILS
DEPICTED ON THE PLAN ARE ONLY
APPROXIMATE AND CARE SHOULD BE                SCALE 1" = 30'
EXERCISED IN THEIR USE.




                                            41





      Figure 6. Lot layout, EDA location, groundwater flow direction and
      installed wells at RC.




                   AREA = 5,000 SQ.FT +/-











                                                                  ï¿½ 3         '

                        Ij X *                             - -  " '                           I "  t ", /
                        ftti  'i t  I              II I'
                        JI   t   I  t I It "                                            -





                      ,dry wl &5





                                          SCALE1" = 20'

LEGEND: 

PROPERTY BOUNDARY (APPROX.)       . 

STRUCTURE

EFFLUENT DISPOSAL AREA (EDA) I I I I 

WETLAND EDGE

NOTE: BOUNDARIES AND OTHER DETAILS
DEPICTED ON THE PLAN ARE ONLY     SCALE 1I" =
APPROXIMATE AND CARE SHOULD BE
EXERCISED IN THEIR USE.





                                              42



  Figure 7. Lot layout, EDA location, groundwater flow direction and
  installed wells at CSL.



                  AREA = 40,000 SQ.FT. +/-


                  HIGHEST CBS. TIDE-  (VeGETAI'ION
















     PEBN(P.CI  40











                                            ,.1.S ..
LEGEND:

PROPERTY BOUNDARY (APPROX.)      . ___             SCALE 1" = 40'

STRUCTURE 

EFFLUENT DISPOSAL-AREA (EDA)

WETLAND EDGE

NOTE: BOUNDARIES AND OTHER DETAILS
DEPICTED ON THE PLAN ARE ONLY
APPROXIMATE AND CARE SHOULD BE
EXERCISED IN THEIR USE.




                                     43




Figure 8. Lot layout, EDA location, groundwater flow direction and
installed wells at WRH.



       LOT AREA =  18,000 SQ.FT.+/-






                                   ~~./
                                            /-




                             ï¿½~
                     .s ,_^,.,4  J o.%.        ,


                /               -f  6            \
                                                    HIGHEST 085 TIDs E
                                               / *1 <>          (TI VGETAT I ON} I
         .7~~~3

















                                           \  LEGEND:

          i   \      ;  \/o             .      ~~~~~~~PROPERTY BOUNDARY (APPROX.). _

                                             \    0STRUCTURE W

                                            EFFL UENT DISPOSAL AREA (EDA)|l-      |

                                            \\WETLAND EDE

                AL                           ~~~~~~~~~NOTE: BOUNDARIES AND OTHER DETAILS
     SCALE  I -30                                DEPICTED ON THE PLAN ARE ONLY      SCALE I 
                                            APPROXIMATE AND CARE SHOULD BE
                                            EXERCISED IN THEIR USE.
                                        ~~A A
                                               7~~~~~~~,
                                          7  LEGEND:~~~~~J,,~








                                     /  ~ WTLN  LEDGEND






                                            NOTE: BOUNDARIES AND OTHER DETAILS
     SCALE 1"  =30'                              DEPICTED ON THE PLAN ARE ONLY      SCALE 1"
                                            APPROXIMATE AND CARE SHOULD BE
                                            EXERCISED IN THEIR USE.




   Figure 9.  Lot layout, EDA  location, groundwater flow direction and
   installed wells at KDB.


       AREA  =  32,000 SQ. FT.  /-




                     ï¿½\             / X                           iN





                Kimberiy Dr.                                                  ;







                                   ::  X






                  \,                     9p ./                                /:





LEGEND:                                     \/ 
                                          HIGHEST OBS. TIDE
PROPERTY BOUNDARY (APPROX.)       .               (Vegetation)

STRUCTURE                     /
EFFLUENT DISPOSAL AREA (EDA)   I |   |

WETLAND EDGE

NOTE: BOUNDARIES AND OTHER DETAILS
DEPICTED ON THE PLAN ARE ONLY
APPROXIMATE AND CARE SHOULD BE      SCALE 1" = 50'
EXERCISED IN THEIR USE.

                                           45



    Figure 10. Lot layout, EDA location, groundwater flow direction
    and installed wells at FDC.

                       AREA = 13,900 SQ.FT. +/- 



                         p-,.

                      /

                                            -N
                      / '~~~~-.
               t/'               :ï¿½ ''7
                 /







                     (   A~~/d






LEGEND:

PROPERTY BOUNDARY (APPROX.) /
STRUCTURE                                                                       /
EFFLUENT DISPOSAL AREA (EDA)  I                       SCALE 1  = 30'
WETLAND EDGE                         . --
NOTE: BOUNDARIES AND OTHER DETAILS
DEPICTED ON THE PLAN ARE ONLY
APPROXIMATE AND CARE SHOULD BE
EXERCISED IN THEIR USE.

                                       46




 Figure 11. Nitrate and ammonium concentrations in KDB wells.






                     KDB NITRATE LEVELS
               OPEN SYMBOL: UP GRADIENT WELL
            SHADED SYMBOL: DOWN GRADIENT WELL

                 30        I'                             -c---~~~~~~~~~~~~~~KDB.-1
                                                          -z-KDB-2
  25                                                            KD-
                                                          ---KDB-4
                                                          -.-KDB-5
 ~20  ----KDB-6
-t    - M- KDB-7
               2    ~ ~~~~~~                              -u- ~~~~~~~~~KDB-8
               1$~~~~~~~~~~~~~~~~~~~~--- KDB-9D

 10

             z lo~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   5



     0                50                1 00              150
                          DAY OF YEAR


                   KDB AMMONIUM LEVELS
              OPEN SYMBOL:  UP GRADIENT WELL
           SHADED SYMBOL: DOWN GRADIENT WELL


    3.

                                             -.o-KDB-1
    2.5 -                                     &KDB-2-
                                             -+-KDB-3
 76  2~                                           D-4
             -                      I        -.--~~~~~~~~~~~KDB-5
                                     /     -f--- KDB-6
            z 1.5                           -&---~~~~~~~~~ KDB-7
                 -                          -a-- ~~~~~~~~~KDB-8
                                           -- -.--- KDB-9D-


    0.


       0               50             1 00             150
                         DAY OF YEAR



                                       47





Figure 12. Nitrate and ammonium concentrations in RC wells.










                        RC WELL NITRATE LEVELS
                    OPEN SYMBOL: UP GRADIENT WELL
                 SHADED SYMBOL: DOWN GRADIENT WELL

          20

                               -    - - RC-1D
                               - --RC-2
          15
                               15  ItRC-4


        ,        \                                 /



           0/





             0             50            100            150
                              DAY OF YEAR
                          RC AMMONIUM LEVELS
                    OPEN SYMBOL: UP GRADIENT WELL
                  SHADED SYMBOL: DOWN GRADIENT WELL

          20 . . . . . 
                                                - -*  - RC-1D
                                                -- - RC-2
                                                  -   RC-3
                          15'A  - * i /k           RC-4







           15 





             0             50            100           150
                              DAY OF YEAR




Figure 13.  Nitrate and ammonium concentrations in RB wells.







                         RB NITRATE LEVELS
                   OPEN SYMBOL: UP GRADIENT WELL
                SHADED SYMBOL: DOWN GRADIENT WELL

      0.7  '

      0.6     \
                                                 -I--- R-12
                                                 :-u- RB-3
                         0.6    a\~~~~~~          --I-- - RB-4
      0.5

   E 0.4            \

   c 0.3             \
   0     -
      0.2  

      0.1

       I0 

        -50        0         50         100       150        200
                             DAY OF YEAR


                        RB AMMONIUM LEVELS
                   OPEN SYMBOL: UP GRADIENT WELL
                 SHADED SYMBOL: DOWN GRADIENT WELL

          1.8
          1.6               A          6        I  RB2 

                               1.4/~~          -a-~ | RB-3
           1.4\  n                                -- RB-4

        U 1.2



        0.8  /



          0.4 

          0.2
            -50      0        50                        200
                             DAY OF YEAR




Figure 14. Phosphate concentrations in KDB and RC Nvells.



















                                  KDB Phosphate
                     0.1
                              ~KDB1I
                             -      KDB-2
                    0.08--      KDB-3
                           ~-~*-KDB-5
                           -.-- KDB-4
                    0.06--  --KDB-6
                           E  - - KDB-7
                           -t- -KDB-8
                    0.04-- ---.--KDB-9D

                    0.02


                       0          50          100          150
                                        DAY




                                  RC Phosphate
                      7

                      6    ---RC-ID
                          --A--RC-2                      AIJ
                          -u-- RC-4



                    2 2



                     0 
                       0          50          100          150
                                        DAY








                                         50