U.S. ENVIRONMENTAL PROTECTION AGENCY
NATIONAL EUTROPHICATION SURVEY
WORKING PAPER SERIES
REPORT
ON
EAGL£VIL1£ LAIC
TOLLAND COUNTY
CONNECTICUT
EPA REGION I
WORKING PAPER No, 179
PACIFIC NORTHWEST ENVIRONMENTAL RESEARCH LABORATORY
An Associate Laboratory of the
NATIONAL ENVIRONMENTAL RESEARCH CENTER - CORVALLIS, OREGON
and
NATIONAL ENVIRONMENTAL RESEARCH CENTER - LAS VEGAS, NEVADA
iTGPO 697-032
-------
REPORT
ON
EAGLEVILLE LAKE
TOLLAND COUNTY
CONNECTICUT
EPA REGION I
WORKING PAPER No, 179
WITH THE COOPERATION OF THE
CONNECTICUT DEPARTMENT OF ENVIRONMENTAL PROTECTION
AND THE
CONNECTICUT NATIONAL GUARD
JANUARY, 1975
-------
CONTENTS
Page
Foreword i i
List of Connecticut Study Lakes iv
Lake and Drainage Area Map v
Sections
I. Conclusions ]
II. Introduction 3
III. Lake and Drainage Basin Characteristics 4
IV. Lake Water Quality Summary 5
V. Nutrient Loadings 9
VI. Literature Reviewed 14
VII. Appendices 15
-------
11
FOREWORD
The National Eutrophication Survey was initiated in 1972 in
response to an Administration commitment to investigate the nation-
wide threat of accelerated eutrophication to fresh water lakes and
reservoirs.
OBJECTIVES
The Survey was designed to develop, in conjunction with state
environmental agencies, information on nutrient sources, concentrations,
and impact on selected freshwater lakes as a basis for formulating
comprehensive and coordinated national, regional, and state management
practices relating to point-source discharge reduction and non-point
source pollution abatement in lake watersheds.
ANALYTIC APPROACH
The mathematical and statistical procedures selected for the
Survey's eutrophication analysis are based on related concepts that:
a. A generalized representation or model relating
sources, concentrations, and impacts can be constructed.
b. By applying measurements of relevant parameters
associated with lake degradation, the generalized model
can be transformed into an operational representation of
a lake, its drainage basin, and related nutrients.
c. With such a transformation, an assessment of the
potential for eutrophication control can be made.
LAKE ANALYSIS
In this report, the first stage of evaluation of lake and water-
shed data collected from the study lake and its drainage basin is
documented. The report is formatted to provide state environmental
agencies with specific information for basin planning [§303(e)]s water
quality criteria/standards review [§303(c)], clean lakes [§314(a,b)],
and water quality monitoring [§106 and §305(b)j activities mandated
by the Federal Water Pollution Control Act Amendments of 1972.
-------
111
Beyond the single lake analysis, broader based correlations
between nutrient concentrations (and loading) and trophic condi-
tion are being made to advance the rationale and data base for
refinement of nutrient water quality criteria for the Nation's
fresh water lakes. Likewise, multivariate evaluations for the
relationships between land use, nutrient export, and trophic
condition, by lake class or use, are being developed to assist
in the formulation of planning guidelines and policies by EPA
and to augment plans implementation by the states.
ACKNOWLEDGMENT
The staff of the National Eutrophication Survey (Office of
Research & Development, U. S. Environmental Protection Agency)
expresses sincere appreciation to the Connecticut Department of
Environmental Protection for professional involvement and to
the Connecticut National Guard for conducting the tributary
sampling phase of the Survey.
John J. Curry, Director of the former Water Resources Commission;
Roy B. Anderson, Principal Sanitary Engineer, and Steven Gerdsmeier,
Sanitary Engineer, of the Water Compliance Unit, Department of Environ-
mental Protection; and Sam Suffern, Assistant Director of Water and
Related Resources, Department of Environmental Protection, provided
invaluable lake documentation and counsel during the course of the
Survey.
Major General John F. Freund, the Adjutant General of Connecticut,
and Project Officer Lieutenant Colonel Daniel M. McGuire, who directed
the volunteer efforts of the Connecticut National Guardsmen, are also
gratefully acknowledged for their assistance to the Survey.
-------
iv
NATIONAL EUTROPHICATION SURVEY
STUDY LAKES
STATE OF CONNECTICUT
LAKE NAME
Aspinook Pond
Bantam
Communi ty
Eagleville
Hanover Pond
Housatonic Impoundments:
Housatonic
Lillinonah
Zoar
COUNTY
New London, Windham
Litchfield
New Haven
Tolland
New Haven
Fairfield, New Haven
Fairfield, Litchfield,
New Haven
Fairfield, New Haven
-------
42°00'
41°5S'
EAGLEVILLE LAKE
I Tributary Sampling Site
* Lake Sampling Site
f Sewage Treatment Facility
r Direct Drainage Area Limits
' 0 ?
41'SO1
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EAGLEVILLE LAKE
STORE! NO. 0904
I. CONCLUSIONS
A. Trophic Condition:
Eagleville Lake is eutrophic with humic, acid waters that
are high in nutrients and support heavy growths of emergent
and submergent vegetation and, reportedly, periodic algal blooms.
B. Rate Limiting Nutrient:
Algal assay results indicate that Eagleville Lake was nitrogen
limited at the time the fall sample was collected. The lake data
indicate nitrogen limitation in May also (the N/P ratio = 7/1) but
phosphorus limitation in August (N/P = 15/1).
C. Nutrient Controllability:
1. Point sources—During the sampling year, Eagleville Lake
received a total phosphorus load at a rate nearly 13 times the
rate proposed by Vollenweider (in press) as dangerous; i.e., a
eutrophic rate (see page 13). While Vollenweider's model may not
be applicable to water bodies with a very short detention time, it
is apparent that Eagleville Lake receives excessive nutrient loads.
It is calculated that the four point sources considered in this
study contributed nearly 65% of the total phosphorus load. While
even complete removal of phosphorus at the four sources would still
leave a loading rate of more than four times Vollenweider's eutrophic
-------
rate, it is likely that a high degree of removal would result in
a significant improvement in the trophic condition of Eagleville
Lake.
2. Non-point sources (see page 13)—The phosphorus exports
of Cedar Brook, Eagleville Brook, and the unnamed brook (B-l)
were very high during the sampling year as compared to the 85 Ibs/
2
m /yr export of an unimpacted tributary of Aspinook Pond* (Cory
Brook). The cause of such high phosphorus exports is not apparent
from the data and information available, and a need for further
study is indicated.
In all, it is calculated that non-point sources contributed
about 35% of the total phosphorus load to Eagleville Lake during
the sampling year.
* Working Paper No. 176.
-------
II. INTRODUCTION
Eagleville Lake is an impoundment of the Willimantic River which
extends in a southeast-northwest direction through the townships of
Coventry and Mansfield. Shoreline development is minimal. This small,
shallow lake has very short hydraulic retention time; the Willimantic
River represents the only significant flow input.
Recreational use is limited by access restrictions and frequent
heavy algal blooms. Natural populations of largemouth bass, chain
pickerel, yellow perch, sunfish,and golden shiners are maintained
(Anonymous, 1959). Fishing probably represents the primary recreational
use of the lake.
Much of the bottom is covered by muck from the decomposition of
abundant emergent vegetation which is present over nearly 70 percent
of the surface area of the lake. Periodic algal blooms also contribute
to the muck layer.
-------
III. LAKE AND DRAINAGE BASIN CHARACTERISTICS
A. Lake Morphometry :
1. Surface area: 80 acres.
2. Mean depth: 3 feet.
3. Maximum depth: 10 feet.
4. Volume: 240 acre/feet.
5. Mean hydraulic retention time: 15 hours.
B. Tributary and Outlet: '
(See Appendix A for flow data)
t
1. Tributaries -
Name Drainage area* Mean flow*
Willimantic River 101.0 mi2 168.8 cfs
Unnamed Brook B-l 0.7 mi- 1.3 cfs
Cedar Brook 5.1 mi? 9.3 cfs
Eagleville Brook 2.3 mi 4.3 cfs
Minor tributaries & 2
immediate drainage - 1.8 mi 3.8 cfs
Totals 110.9 mi2 187.5 cfs
2. Outlet -
Wi11imantic River 111.0 mi2** 187.5 cfs
C. Precipitation***:
1. Year of sampling: 64.6 inches.
2. Mean annual: 43.4 inches.
t Anonymous, 1972.
* Drainage areas are accurate within ±1%; gaged mean daily and mean monthly
flows are accurate within ±10%; ungaged mean daily and mean monthly flows
are accurate within ±20%; and normalized mean monthly flows are accurate
within ±10% for gaged streams and within ±12% (high flow) to 27% (low flow)
for ungaged streams.
** Includes area of lake. i
*** See Working Paper No. 1, "Survey Methods".
-------
IV. LAKE WATER QUALITY SUMMARY
Eagleville Lake was sampled three times during the open-water season
of 1972 by means of a pontoon-equipped Huey helicopter. Each time,
samples for physical and chemical parameters were collected from two
depths at a single station (see map, page v). During each visit, a
single depth-integrated (near bottom to surface) sample was obtained for
phytoplankton identification and enumeration; and during the last visit,
a single five-gallon depth-integrated sample was collected for algal
assays. Also each time, a depth-integrated sample was collected for
chlorophyll a_ analysis. The maximum depth sampled was 5 feet.
The results obtained are presented in full in Appendix B, and the
data for the fall sampling period, when the lake essentially was well-
mixed, are summarized below. Note, however, the Secchi disc summary is
based on all values.
For differences in the various parameters at the other sampling times,
refer to Appendix B.
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A. Physical and chemical characteristics:
B.
Parameter Minimum
Temperature (Cent.) 15.6
Dissolved oxygen (mg/1) 8.0
Conductivity (ymhos) 80
pH (units) 6.6
Alkalinity (mg/1) 10
Total P (mg/1) 0.061
Dissolved P (mg/1) 0.028
N0? + NO, (mg/1) 0.230
Ammonia fmg/1) 0.130
Secchi disc (inches) 60
Biological characteristics:
FALL VALUES
(10/08/72)
Mean Median
15.6
8.0
80
6.7
10
0.062
0.028
0.230
0.135
ALL VALUES
63
1. Phytoplankton* -
Sampling
Date
08/04/72
10/08/72
Dominant
Genera
1. Flagellates
2. Navicula
3. Cryptomonas
4. Dinobryon
5. Cyclotella
Other genera
Total
1. Flagellates
2. Cyclotella
3. Nitzschia
4. Navicula
5. Asterionella
Other genera
Total
15.6
8.0
80
6.7
10
0.062
0.028
0.230
0.135
63
Maximum
15.6
8.0
80
6.8
10
0.063
0.029
0.230
0.140
66
Number
per ml
2,333
524
398
344
253
687
4,539
4,444
* The May sample was lost in shipment.
-------
2. Chlorophyll a_ -
(Because of instrumentation problems during the 1972 sampling,
the following values may be in error by plus or minus 20 percent.)
Sampling Station Chlorophyll a_
Date Number (yg/1)
05/29/72 01 2.4
08/04/72 01 13.6
10/08/72 01 5.7
C. Limiting Nutrient Study:
1. Autoclaved, filtered, and nutrient spiked -
Ortho P Inorganic N Maximum yield
Spike (mg/1) Cone, (mg/1) Cone, (mg/1) (mg/l-dry wt.)
Control
0.006 P
0.012 P
0.024 P
0.060 P
0.060 P + 10.0 N
10.0 N
2. Discussion -
The control yield of the assay alga, Selenastrum capri-
cornutum, indicates that the potential primary productivity
of Eagleville Lake was high at the time the sample was col-
lected. Also, the lack of response to increased levels of
orthophosphorus, until nitrogen was also added, indicates the
sample was nitrogen limited. Note that the addition of only
nitrogen resulted in a relatively small but significant in-
crease in yield. The lake data also indicate marginal nitro-
gen limitation at the time of sampling (the N/P ratio was a
little less than 13/1).
0.034
0.040
0.046
0.058
0.094
0.094
0.034
0.330
0.330
0.330
0.330
0.330
10.330
10.330
7.2
7.4
7.6
7.4
7.8
44.1
10.0
-------
The lake data indicate nitrogen limitation in May
also (N/P = 7/1) but phosphorus limitation in August (N/P
= 15/1).
D. Trophic Condition:
Survey data show that Eagleville Lake is eutrophic with
humic-colored waters of moderate turbidity and high levels of
inorganic nutrients.
Frequent algal blooms have been reported (Anonymous, 1972),
although none were noted on the sampling dates of the Survey.
Abundant emergent and submerged vegetation contribute to the
deposits of muck which cover the sand and gravel bottom. The
algal assay control yield and chlorophyll a^ concentrations
support the high productive potential suggested.
-------
V. NUTRIENT LOADINGS
(See Appendix C for all data)
For the determination of nutrient loadings, the Connecticut National
Guard collected monthly near-surface grab samples from the tributary
sites indicated on the map (page v), except for the high runoff months
of March and May, and the colder months when low flows and ice cover
prevented sampling at some of the stations. Sampling was begun in August,
1972, and was completed in October, 1973.
Through an interagency agreement, stream flow estimates for the year
of sampling and a "normalized" or average year were provided by the Con-
necticut District Office of the U.S. Geological Survey for the tributary
sites nearest the lake.
In this report, nutrient loads for sampled tributaries were determined
by using a modification of a U.S. Geological Survey computer program for
calculating stream loading*. However, the non-point (background) loads
for the Willimantic River were estimated by using mean concentrations in
the Middle River at station F-l and the mean flow at station A-2.
Nutrient loadings for unsampled "minor tributaries and immediate
drainage" ("ZZ" of U.S.G.S.) were estimated by using the means of the
2
nutrient loads, in Ibs/mi /year, in Eagleville Creek at station D-l and
2
multiplying the means by the ZZ area in mi .
The operators of the Stafford Springs and Mansfield Training School
wastewater treatment plants provided monthly effluent samples and cor-
responding flow data. The unsampled Mansfield Depot loads were estimated
* See Working Paper No. 1.
-------
10
at 2.5 Ibs P and 7.5 Ibs N/capita/year; and the untreated discharges
from Willington local sewers were calculated at 3.5 Ibs P and 9.4 Ibs
N/capita/year for an estimated population of 500 persons.
A. Waste Sources:
1. Known municipal -
Name
Stafford
Springs
Mansfield
Training
School
Mansfield
Depot
Willington -
local sewers
Pop.
Served
1,500
500
500
500
Treatment
act. sludge
+ sand
f i 1 ters
trickling
filter
+ sand
filters
Unknown
None
Mean
Flow
2.
0.
0.
0.
Receiving
(mgd)
004
334
050*
050*
Water
Will
Will
Will
Will
imantic
i man tic
imantic
imantic
River
River
River
River
2. Known industrial - None
t Armet, 1973.
* Estimated at 100 gal/capita/day.
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11
B. Annual Total Phosphorus Loading - Average Year:
1. Inputs -
Ibs P/ % of
Source yr total
a. Tributaries (non-point load) -
Willimantic River 8,310 21.5
Unnamed Brook (B-l) 510 1.3
Cedar Brook 3,220 8.3
Eagleville Brook 830 2.1
b. Minor tributaries & immediate
drainage (non-point load) - 630 1.7
c. Known municipal -
Stafford Springs 16,590 43.0
Mansfield Training School 5,490 14.2
Mansfield Depot 1,250 3.2
Willington 1,750 4.5
d. Septic tanks** - 30 0.1
e. Known industrial - None
f. Direct precipitation** - 10 <0.1
Total 38,600 100.0
2. Outputs -
Lake outlet - Willimantic River 30,470
3. Net annual P accumulation - 8,130 pounds
* Estimate based upon 50 lakeshore dwellings; see Working Paper No. 1
** See Working Paper No. 1.
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12
Q. Annual Total Nitrogen Loading - Average Year:
1. Inputs -
Ibs N/ % of
Source ^r total
a. Tributaries (non-point load) -
. Willimantic River 337,950 61.2
Unnamed Brook (B-l) 4,520 0.8
Cedar Brook 32,200 5.8
Eagleville Brook 12,890 2.3
b. Minor tributaries & immediate
drainage (non-point load) - 10,090 1.8
c. Known municipal -
Stafford Springs 133,350 24.1
Mansfield Training School 11,950 2.2
Mansfield Depot 3,750 0.7
Willington 4,700 0.8
d. Septic tanks* - 1,180 0.2
e. Known industrial - None
f. Direct precipitation** - 770 0.1
Total 553,350 100.0
2. Outputs -
Lake outlet - Willimantic River 568,250
3. Net annual N loss - 14,900 pounds
* Estimate based upon 50 lakeshore dwellings; see Working Paper No. 1
** See Working Paper No. 1.
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13
D. Mean Annual Non-point Nutrient Export by Subdrainage Area:
Tri butary Ibs P/mi2/yr Ibs N/nri2/yr
Willimantic River* 82 3,346
Unnamed Brook (B-l) 729 6,457
Cedar Brook 631 6,314
Eagleville Brook 352 5,604
* Estimated.
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14
E. Yearly Loading Rates:
In the following table, the existing phosphorus loading
rates are compared to those proposed by Vollenweider (in press).
Essentially, his "dangerous" rate is the rate at which the
receiving water would become eutrophic or remain eutrophic;
his "permissible" rate is that which would result in the
receiving water remaining oligotrophic or becoming oligotrophic
if morphometry permitted. A mesotrophic rate would be consid-
ered one between "dangerous" and "permissible".
Note that Vollenweider's model may not be applicable to
water bodies with very short detention times.
Total Phosphorus Total Nitrogen
Units Total Accumulated Total Accumulated
Ibs/acre/yr 482.5 101.6 5,916.9 loss*
grams/m2/yr 54.08 11.39 775.3
Vollenweider loading rates for phosphorus
(g/m2/yr) based on the surface area and
medan outflow of Eagleville Lake:
"Dangerous" (eutrophic rate) 4.20
"Permissible" (oligotrophic rate) 2.10
* There was an apparent loss of nitrogen during the sampling year. This
may have been due to nitrogen fixation in the lake, solubilization of
previously sedimented nitrogen, recharge with nitrogen-rich ground water,
unknown and unsampled point sources discharging directly to the lake, or
underestimation of the nitrogen loads from Mansfield Depot and Willington.
Whatever the cause, a similar nitrogen loss has occurred at Shagawa Lake,
Minnesota, which has been intensively studied by EPA's National Eutrophi-
cation Research and Lake Restoration Branch.
-------
15
VI. LITERATURE REVIEWED
Anonymous, 1959. A fishery survey of the lakes and ponds of
Connecticut. Rept. No. 1, CT Bd. of Fish. & Game, Hartford.
Anonymous, 1972. Survey questionnaire. CT Dept. of Env. Prot.,
Hartford.
Armet, Brian W., 1973. Wastewater treatment plant questionnaires.
CT Dept. of Env. Prot., Hartford.
Vollenweider, Richard A. (in press). Input-output models. Schweiz,
Z. Hydrol.
-------
VII. APPENDICES
APPENDIX A
TRIBUTARY FLOW DATA
-------
TRIBUTARY FLOW INFORMATION FOR CONNECTICUT
11/36/74
LAKE CODE 0904
EAGLEVILLE LAKE
TOTAL DRAINAGE AREA OF LAKE 111.00
SUB-DRAINAGE
TRIBUTARY AREA
JAN
FEB
MAR
APR
MAY
NORMALIZED FLOWS
JUN JUL AUG
SEP
OCT
NOV
DEC
MEAN
0904A1
0904A2
0904B1
0904CI
090401
0904ZZ
111.00
101.00
0.67
5.10
2.28
2.00
214.40
192.00
1.60
11.00
5.20
4.60
2?3.20
199.00
1.70
12.00
5.60
4.90
375.40
335.00
2.90
20.00
9.30
8.20
366.80
331.00
2.40
18.00
8.20
7.20
228.70
207.00
1.50
11.00
4.90
4.30
144.66
135.00
0.66
4.90
2.20
1.90
78.91
74.00
0.28
2.60
1.10
0.93
83.39
76.00
0.49
3.70
1.70
1.50
97.16
91.00
0.36
3.20
1.40
1.20
91.89
82.00
0.69
4.90
2.30
2.00
160.10
140.00
1.50
9.80
4.70
4.10
189.00
167.00
1.60
11.00
5.00
4.40
187.46
168.78
1.30
9.32
4.29
3.76
TOTAL DRAINAGE AREA OF LAKE =
SUM OF SUB-DPAINAGE AREAS =
111.00
111.05
MEAN MONTHLY FLOWS AND DAILY FLOWS
TRIBUTARY MONTH YEAR MEAN FLOW DAY
0904A1
FLOW DAY
0904A2
8
9
10
11
12
1
?
3
4
5
6
7
8
9
10
8
q
10
11
1?
1
?
3
4
5
6
7
8
9
10
72
78
72
72
72
73
73
73
73
73
73
73
73
73
73
72
72
72
7?
72
73
73
73
73
73
73
73
73
73
73
SUMMARY
93.00
70.00
110.00
319.00
534.00
372.00
438.00
311.00
477.00
290.00
143.00
131.00
45.00
94.00
42.00
85.00
66.00
98.00
27P..OO
472.00
338.00
388.00
275.00
422.00
256.00
130.00
119.00
41.00
86.00
3ft. 00
19
15
29
19
10
25
17
6
6
24
21
18
15
13
19
15
29
19
10
25
17
6
6
24
21
18
15
13
99.00
79.00 24
105.00
214.00
790.00
193.00
367.00 28
538.00 25
236.00 12
124.00
112.00
40.00
92.00
40.00
90.00
74.00 24
94.00
187.00
698.00
171.00
325.00 28
476.00 25
208.00 12
113.00
102.00
36.00
84.00
36.00
53.00
280.00
256.00
449.00
50.00
248.00
226.00
397.00
TOTAL FLOW IN
TOTAL FLOW OUT
FLOW DAY
FLOW
49.00
26
282.00
46.00
26
250.00
2253.61
2253.61
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TRIBUTARY FLOW INFORMATION FOR CONNECTICUT
11/26/74
LAKE CODE 0904
EAGLEVILLE LAKE
MEAN MONTHLY FLOWS AND DAILY FLOWS
TRIBUTARY MONTH YEAR MEAN FLOW DAY
090481
0904C1
0904D1
8
9
10
11
1?
1
2
3
4
5
6
7
8
9
10
8
9
10
11
12
1
2
3
4
5
6
7
8
9
10
8
9
10
11
12
1
2
3
4
5
f>
7
8
9
10
72
72
72
72
72
73
73
73
73
73
73
73
73
73
73
72
72
72
72
72
73
73
73
73
73
73
73
73
73
73
72
72
72
72
72
73
73
73
73
73
73
73
73
73
73
0.55
0.26
0.83
3.00
4.50
2.20
3.90
2.80
4.20
2.60
0.90
0.80
0.30
0.60
0.20
4.10
2.30
5.90
20.00
31.00
17.00
25.00
18.00
28.00
17.00
6.60
6.00
2.10
4.30
1.90
1.90
1.00
2.80
9.40
14.00
7.60
11.00
8.10
12.00
7.60
2.90
2.70
0.90
1.90
0.90
19
15
29
19
10
25
17
6
6
24
21
18
15
13
19
15
29
19
10
25
17
6
6
24
21
18
15
13
19
15
29
19
10
25
17
6
6
24
21
18
15
13
FLOW DAY
0.58
0.29
0.79
2.00
6.70
1.70
3.20
4.80
2.10
0.70
0.70
0.20
0.60
0.20
4.40
2.60
5.60
13.00
46.00
11.00
21.00
31.00
14.00
5.70
5.10
1.80
4.20
1.80
2.00
1.10
2.60
6.30
21.00
5.10
9.60
14.00
6.20
2.50
2.30
0.80
1.90
0.80
24
28
25
12
24
28
25
12
24
28
25
12
FLOW DAY
0.20 28
2.50
2.30
4.00
16.00
15.00
26.00
7.30
6.70
12.00
FLOW
0.18
26
2.50
1.80 28
1.60
26
16.00
0.77 28
0.71
26
7.40
o
-------
TRIBUTARY FLOW INFORMATION FOR CONNECTICUT
11/26/74
LAKE CODE 0904
EAGLEVILLE LAKE
MEAN MONTHLY FLOWS AND DAILY FLOWS
TRIBUTARY
0904ZZ
MONTH YEAR
ft
9
10
11
I?
1
?
3
4
5
6
7
8
9
10
72
72
72
72
72
73
73
73
73
73
73
73
73
73
73
MEAN FLOW DAY
1.70
0.87
2.40
8.20
1.2.00
6.70
9.70
6.90
11.00
6.40
2.60
2.40
O.BO
1.70
0.70
19
15
29
19
10
25
17
6
6
24
21
18
15
-13
FLOW DAY
1.80
1.00
2.30
5.50
18.00
4.30
8.10
12.00
5.20
2.20
2.10
0.70
1.70
0.70
24
28
25
12
FLOW DAY
0.66
6.20
5.60
9.90
28
FLOW
0.61
26
6.20
-------
APPENDIX B
PHYSICAL and CHEMICAL DATA
-------
STORET RETRIEVAL DATE 74/11/36
090401
41 47 00.0 073 17 00.0
EAGLEVILLE LAKE
09 CONNECTICUT
• 00010
DATE TIME DEPTH WATER
FROM OF TEMP
TO DAY FEET CENT
72/05/29 10 50 0000
10 50 0005
72/08/04 11 00 0000
11 00 0004
7?/10/08 18 15 0000
18 15 0004
DATE TIME DEPTH
FROM OF
TO DAY FEET
72/05/29 10 50 0000
7?/08/04 11 00 0000
7P/10/08 18 15 0000
18.3
16.9
21.8
15.6
32217
CHLRPHYL
A
UG/L
2.4J
13. 6J
5.7J
00300 00077 00094
DO TRANSP CNDUCTVY
SECCHI FIELD
MG/L INCHES MICROMHO
6.9
7.3
5.4
8.0
66
60
90
90
92
93
80
80
11EPALES
4
00400
PH
SU
6.60
6.40
6.40
6.30
6.65
6.75
00410
T ALK
CAC03
MG/L
10K
10K
11
13
10K
10K
2111202
0010
00630
N02&N03
N-TOTAL
MG/L
0.220
0.160
0.460
0.440
0.230
0.230
FEET DEPTH
00610
NH3-N
TOTAL
MG/L
0.290
0.330
0.280
0.320
0.140
0.130
00665
PHOS-TOT
MG/L P
0.092
0.132
0.098
0.096
0.063
0.061
00666
PHOS-OIS
MG/L P
0.031
0.120
0.049
O.OS2
0.029
0.028
VALUE KNOWN TO BE LESS
THAN INDICATED
J VALUE KNOWN TO BE IN ERRO*
-------
APPENDIX C
TRIBUTARY and WASTEWATER
TREATMENT PLANT DATA
-------
STORE! RETRIEVAL DATE 74/11/26
0904A1 LS0904A1
41 47 00.0 072 16 30.0
WILLIMANTIC RIVER
09 7.5 S COVENTRY
0/EAGLEVILLE LAKE
DAM ABOVE U 0 CT STP
11EPALES 2111204
4 0000 FEET
DATE
FROM
TO
72/08/19
72/09/29
72/10/29
72/11/19
72/12/10
73/02/25
73/03/17
73/03/28
73/04/25
73/05/06
73/05/12
73/06/24
73/07/21
73/08/18
73/09/15
00630 00625
TIME DEPTH N02&N03 TOT KJEL
OF N-TOTAL N
DAY FEET
10
09
09
14
09
09
13
10
09
09
09
08
09
09
09
40
45
30
35
50
00
20
00
45
40
50
15
30
45
25
MG/L
0
0
0
U
0
0
0
0
0
0
0
0
0
0
0
.500
.447
.473
.310
.200
.450
.320
.294
.240
.220
.230
.560
.860
,7?0
.750
MG/L
1.
1.
1.
0.
1.
0.
1.
0.
0.
0.
1.
0.
0.
0.
1.
900
100
780
670
400
540
100
860
920
750
600
660
910
8RO
500
00610 00671 00665
NH3-N PHOS-DIS PHOS-TOT
TOTAL ORTHO
MG/L
0
C
0
0
0
0
0
0
0
0
0
0
0
0
0
.190
.253
.435
.058
.038
.320
.280
.313
.189
.173
.190
.154
.066
.170
.189
MG/L
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
P
052
035
042
018
005K
028
027
025
017
016
018
034
110
059
066
MG/L P
0.095
0.105
0.128
0.050
0.550
0.050
0.055
0.050
0.050
0.055
0.050
0.080
0.135
0.140
0.130
DEPTH
K VALUE KNOWN TO BE
LESS THAN INDICATED
-------
STORET RETRIEVAL DATE 74/11/26
0904A2 LS0904A2
41 48 00.0 072 18 00.0
WILLIMANTIC RIVER
09 7.5 S COVENTRY
I/EAGLEVILLE LAKE
RIPLEY HILL RD BRDG BELOW MANSFIELD STP
11EPALES 2111204
4 . 0000 FEET DEPTH
DATE
FROM
TO
72/08/19
72/09/24
72/10/29
72/11/19
72/12/10
73/02/25
73/03/17
73/03/28
73/04/25
73/05/06
73/05/12
73/06/24
73/07/21
73/08/18
73/10/13
00630 00625
TIME DEPTH N02&N03 TOT KJEL
OF N-TOTAL N
DAY FEET
09
08
14
09
09
14
09
10
10
10
08
09
08
10
25
45
45
00
45
20
20
30
20
30
15
20
30
15
MG/L
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
•
•
•
•
•
•
*
•
•
•
•
•
•
•
•
330
802
150
230
210
350
260
294
231
231
220
770
160
800
180
MG/L
1.
1.
1.
0.
0.
0.
0.
1.
0.
1.
0.
?.
0.
1.
0.
100
150
260
305
320
340
700
380
960
640
760
310
935
150
650
00610 00671 00665
NH3-N PHOS-DIS PHOS-TOT
TOTAL ORTHO
MG/L
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
400
251
147
030
029
189
350
315
170
147
160
650
200
069
220
MG/L P
0.054
0.120
0.017
0.011
0.005K
0.010
0.022
0.039
0.019
0.014
0.028
0.048
0.079
0.115
0.015
MG/L P
0.091
0.198
0.081
0.036
0.017
0.035
0.045
0.060
0.055
0.060
0.040
0.120
0.168
0.155
0.090
K VALUE KNOWN TO BE
LESS THAN INDICATED
-------
STORE! RETRIEVAL DATE 74/11/26
0904A3 LS0904A3
41 48 00.0 072 19 00.0
WILLIMANTIC RIVER
09 7.5 S COVINGTON
T/EAGLF.VILLE LAKE
US ALT 44 BRDG ABOVE MANSFIELD STP
11EPALES 2111204
4 0000 FEET DEPTH
DATE
FROM
TO
7?/08/19
72/09/24
72/10/29
72/11/10
72/12/10
73/03/17
73/03/28
73/04/25
73/05/06
73/05/12
73/06/24
73/07/21
73/08/18
73/09/15
73/10/13
00630 00625
TIME DEPTH N02&-N03 TOT KJEL
OF N-TOTAL N
DAY FEET
09
08
13
08
14
09
10
10
10
08
08
09
08
09
30
30
40
45
43
00
20
10
20
05
25
30
16
00
MG/L
0
0
0
0
0
0
0
0
0
0
0
1
1
1
0
.328
.756
.140
.210
.260
.252
.250
.230
.210
.220
.460
.300
.060
.130
.082
MG/L
1.
0.
1.
0.
0.
0.
1.
1.
2.
1.
0.
1.
1.
0.
400
600
260
330
380
750
150
200
700
175
960
260
470
650
00610 00671 00665
NH3-N PHOS-DIS PHOS-TOT
TOTAL OPTHO
MG/L
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
450
076
164
026
056
320
300
170
160
200
048
380
240
252
315
MG/L
0.
0.
0.
0.
P
056
110
016
009
0.021
0.
0.
0.
0.
0.
0.
0.
0.
0.
019
Oil
014
017
026
074
075
072
050
MG/L P
0.105
0.134
0.085
0.035
0.015
0.045
0.030
0.055
0.120
0.105
0.070
0.145
0.128
0.175
0.110
-------
STORE! RETRIEVAL DATE 74/11/26
0904A4 LS0904A4
41 48 00.0 07? 18 30.0
WILLIMANTIC RIVER
09 7.5 S COVENTRY
T/EAGLEVILLE LAKE
ABOVE MANSFIELD STP NEAR STHOSP
11EPALES 2111204
4 0000 FEET DEPTH
DATE
FROM
TO
72/08/19
72/09/24
72/10/29
72/11/19
72/12/10
73/02/25
73/03/17
73/03/28
73/04/25
73/05/06
73/05/12
73/06/24
73/07/21
73/08/18
73/09/15
73/10/13
TIME DEPTH
OF
DAY FEET
09 45
09 10
08 40
13 50
08 55
09 55
14 32
09 10
10 10
10 00
10 10
08 25
08 35
08 30
08 40
09 40
00630
N02&N03
N-TOTAL
MG/L
0.340
0.755
0.220
0.210
0.230
0.380
0.270
0.2BO
0.230
0.210
0.220
0.490
0.290
1.200
1.240
0.900
00625
TOT KJEL
N
MG/L
1.100
0.950
0.920
0.320
3.200
2.880
0.730
0.750
1.260
0.860
1.000
1.500
1.400
1.600
1.300
0.630
00610
NH3-N
TOTAL
MG/L
0.178
0.210
0.200
0.037
0.063
0.252
0.320
0.336
0.160
0.140
0.160
0.038
0.044
0.370
0.390
0.140
00671
PHOS-DIS
ORTHO
MG/L P
0.038
0.042
0.016
0.009
1.070
0.014
0.016
0.019
0.012
0.014
0.013
0.035
0.066
0.066
0.064
0.084
00665
PHOS-TOT
MG/L P
0.100
0.105
0.120
0.037
1.237
0.080
0.045
0.045
0.045
0.050
0.045
0.100
0.135
0.120
0.120
0.105
-------
STORE! RETRIEVAL DATE 74/11/26
0^04A5 LS0904A5
41 56 00.0 072 18 30.0
WILLIMANTIC RIVER
09 7.5 STAFFORD SPR
T/EAGLEVILLE LAKE
ST HWY 32 BRDG BELOW STAFFORD SPR STP
11EPALES 2111204
4 0000 FEET DEPTH
DATE
FROM
TO
72/09/24
72/11/19
73/01/22
73/03/17
73/05/17
73/07/29
73/08/19
73/09/05
73/09/17
TIME DEPTH
OF
DAY FEET
09 15
12 45
16 15
13 30
17 00
20 00
07 45
09 30
07 45
00630
N028.N03
N-TOTAL
MG/L
0.347
0.190
0.260
0.220
0.140
1.600
0.580
1.420
0.590
00625
TOT KJEL
N
MG/L
1.000
0.500
1.000
0.940
1.470
3.700
2.500
5.500
2.200
00610
NH3-N
TOTAL
MG/L
0.175
0.110
0.420
0.310
0.570
2.000
0.980
3.300
0.940
00671
PHOS-DIS
ORTHO
MG/L P
0.017
0.025
0.036
0.020
0.042
0.480
0.154
0.580
0.160
00665
PHOS-TOT
MG/L P
0.088
0.075
0.102
0.045
0.080
0.660
0.300
0.810
0.310
-------
STORE! RETRIEVAL DATE 74/11/26
0904B1 LS0904R1
41 48 00.0 072 18 00.0
NO NAME
09 7.5 S COVENTRY
T/EAGLEVILLE LAKE
ST HWY 32 BROG
11EPALES 2111204
4 0000 FEET DEPTH
DATE
FROM
TO
72/08/19
72/09/24
72/10/29
72/11/19
72/12/10
73/02/25
73/03/17
73/03/28
73/0^/06
73/04/26
73/05/12
73/06/24
73/07/21
73/08/18
73/09/15
73/10/13
TIME DEPTH
OF
DAY FEET
10
09
14
09
09
10
14
09
09
10
10
08
09
09
08
09
45
00
05
15
37
03
10
30
50
00
00
40
00
05
45
50
00630
N025-N03
N-TOTAL
MG/L
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
.785
.210
.360
.760
.640
.330
.930
.640
.620
.440
.470
.430
.840
.390
.280
.273
.640
00625
TOT KJEL
N
MG/L
1.400
3.800
1.600
0.900
0.580
0.440
1.890
1.800
0.540
0.890
0.640
0.720
1.500
0.730
1.470
1.200
0.880
00610
NH3-N
TOTAL
MG/L
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
.063
.215
.080
.189
.138
.200
.730
.077
.023
.033
.020
.029
.120
.078
.120
.034
.058
00671
PHOS-OIS
ORTHO
MG/L P
0
0
0
0
0
0
0
0
0
0
0
0
0
o
0
0
0
.117
.129
.009
.147
.060
.019
.273
.060
.048
.030
.026
.027
.090
.063
.060
.066
.240
00665
PHOS-TOT
MG/L P
o
o
o
0
0
0
0
0
o
o
o
o
o
o
o
o
0
.270
.195
.040
.294
.150
.035
.370
.840
.080
.060
.065
.060
.155
.200
.190
.180
.250
-------
STORET RETRIEVAL DATE 74/11/26
0904C1 LS0904C1
41 48 00.0 07? 17 30.0
CEDAR BROOK
09 7.5 S COVENTRY
T/EAGLEVILLE LAKE
ST HWY 32 BROG
11EPALES 2111204
4 0000 FEET
DATE
FROM
TO
72/08/19
72/09/24
72/10/29
7P/11/19
72/12/10
73/02/25
73/03/17
73/03/28
73/04/06
73/04/25
73/05/12
73/06/24
73/07/21
73/08/18
73/09/15
73/10/13
00630 00625
TIME DEPTH N025.N03 TOT KJEL
OF N-TOTAL N
DAY FEET
09
09
14
09
09
13
09
09
09
09
08
09
09
08
10
35
10
15
25
25
50
38
20
25
30
50
10
15
45
00
MG/L
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
.560
.532
.210
.317
.420
.360
.470
.320
.231
.230
.230
.640
.530
.370
.380
.2?0
MG/L
1.
1.
1.
0.
5.
0.
0.
0.
1.
0.
2.
0.
1.
1.
1.
1.
200
450
320
390
300
950
170
390
400
840
800
750
760
380
700
320
00610 00671 00665
NH3-N PHOS-DIS PHOS-TOT
TOTAL ORTHO
MG/L
0.
0.
0.
0.
C.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
395
153
069
036
160
100
037
029
069
022
071
029
180
061
064
046
MG/L
0.
0.
0.
0.
1.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
p
078
034
008
009
060
086
Oil
010
014
009
016
039
037
054
060
049
MG/L P
0.086
0.069
0.036
0.024
1.265
0.185
0.011
0.015
0.057
0.080
0.240
0.080
0.200
0.165
0.175
0.160
DEPTH
-------
STORE! RETRIEVAL DATE 74/11/26
0904D1 LS090401
41 47 00.0 07? 17 00.0
EAGLEVILLE BROOK
09 7.5 S COVINGTON
T/
NORTH EAGLEVILLE RD BRDG
ilEPALES 2111204
4 0000 FEET
DATE
FROM
TO
72/08/19
72/09/24
72/11/19
72/12/10
73/02/25
73/03/17
73/03/28
73/04/06
73/04/25
73/05/12
73/06/24
73/07/21
73/08/18
73/09/15
73/10/13
00630 00625
TIME DEPTH N02&N03 TOT KJEL
OF N-TOTAL N
DAY FEET
09
14
09
09
13
09
09
09
09
09
38
08
08
09
40
27
40
12
32
49
30
35
40
05
40
45
25
25
MG/L
0
0
0
0
1
0
1
0
0
0
0
0
0
0
0
.510
.907
.960
.970
.120
.520
.100
.610
.640
.600
.470
.470
.500
.520
.390
MG/L
1.
0.
0.
0.
0.
0.
0.
0.
1.
0.
0.
1.
0.
400
400
210
450
420
960
750
520
470
480
400
800
900
1.400
1.
200
00610 00671 00665
NH3-N PHOS-DIS PHOS-TOT
TOTAL OPTHO
MG/L
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
.260
.066
.025
.150
.300
.120
.120
.035
.072
.028
.027
.190
.105
.115
.110
MG/L
0.
0.
0.
0.
0.
0.
0.
0.
0.
P
023
029
026
080
070
023
088
048
042
0.046
0.
0.
0.
0.
0.
038
038
020
028
031
MG/L P
0.042
0.050
0.039
0.105
0.095
0.230
0.110
0.075
0.120
0.080
0.060
0.135
0.110
0.120
0.095
DEPTH
-------
STORE! RETRIEVAL DATE 74/11/26
0904E1 LS0904E1
41 57 30.0 072 18 00.0
OUTLET OF WARR EN POND
09 7.5 STAFFORD SPR
T/EAGLEVILLE LAKE
IN STAFFORD SPRINGS ABOVE STP
11EPALES 2111204
4 0000 FEET DEPTH
DATE
FROM
TO
72/08/19
72/09/23
72/11/19
72/12/10
73/01/22
73/05/17
73/07/29
73/08/19
73/09/05
73/09/17
00630 00625
TIME DEPTH N02&N03 TOT KJEL
OF N-TOTAL N
DAY FEET
13
08
12
13
16
16
IB
18
07
09
07
45
35
30
30
30
45
00
30
30
45
35
MG/L
0
0
0
0
0
0
0
0
0
0
0
.200
.238
.399
.260
.330
.200
.189
.130
.270
.082
.273
MG/L
0.
1.
0.
0.
0.
0.
0.
0.
1.
0.
1.
860
550
560
260
580
280
750
500
320
980
200
00610 00671 00665
NH3-N PHOS-DIS PHOS-TOT
TOTAL ORTHO
MG/L
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
231
280
189
056
290
027
132
031
280
072
280
MG/L
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
P
009
005K
012
005K
005K
005K
010
015
008
019
010
MG/L P
0.029
0.032
0.033
0.015
0.015
0.010
0.020
0.030
0.040
0.025
0.045
K VALUE KNOWN TO BE
LESS THAN INDICATED
-------
STORET RETRIEVAL DATE 74/11/26
0904F1 LS0904F1
41 57 00.0 07? 18 30.0
MIDDLE RIVER
09 7.5 STAFFORD SPR
T/EAGLEVILLE LAKE
TOLLAND AVE BRDG ABOVE STAFFORD SPR STP
11EPALES 2111304
4 0000 FEET DEPTH
DATE
FROM
TO
72/09/23
72/10/29
72/11/19
73/03/17
73/05/17
73/07/29
73/08/19
73/09/05
73/09/17
TIME DEPTH
OF
DAY FEET
07 40
12 20
13 00
17 45
20 30
10 00
20 00
00630
N02&N03
N-TOTAL
MG/L
0.247
0.150
0.120
0.150
0.088
0.140
0.110
0.310
0.110
00625
TOT KJEL
N
MG/L
0.600
1.260
0.260
0.580
1.390
0.580
0.860
1.300
1.000
00610
NH3-N
TOTAL
MG/L
0.179
0.105
0.022
0.033
0.031
0.026
0.065
0.070
0.087
00671
PHOS-DIS
ORTHO
MG/L P
0.005K
0.005K
0.006
0.007
0.007
0.010
0.005K
0.008
0.009
00665
PHOS-TOT
MG/L P
0.029
0.024
0.013
0.015
0.015
0.040
0.020
0.035
0.030
K VALUE KNOWN TO BE
LESS THAN INDICATED
-------
STORET RETRIEVAL DATE 74/11/27
090450 SF090450 P001500
41 57 00.0 072 18 00.0
STAFFORD SPRINGS
09 7.5 STAFFORD SPR
T/EAGLEVILLE LAKE „,
MILLIMATIE RIVER V
11EPALES 21412*4
4 0000 FCET DEPTH
00630 00625 00610 00671 00665 50051 50053
DATE TIME DEPTH N02&N03 TOT KJEL NH3-N PHOS-DIS PHOS-TOT FLOW CONDUIT
FROM OF
TO DAY FEET
73/03/07 08 00
CP(T>-
73/03/07 16 30
73/04/09 07 00
CP(T>-
73/04/09 15 00
73/05/15
73/07/05 08 00
CP(T)-
73/07/05 16 00
73/08/16 08 00
CP-
73/08/16 16 00
73/09/18 08 00
CP-
74/01/15 16 00
74/02/17 08 00
CP(T>-
74/02/17 15 30
74/03/15 08 00
CP(T>-
74/03/15 15 00
74/04/15 10 00
CP-
74/04/15 15 30
74/05/16 08 00
CP(T)-
74/05/16 16 00
74/06/15 09 00
CP-
74/06/15 15 00
OTAL
IG/L
0.165
0.399
0.420
6.300
2.730
4.500
7.600
2.240
0.040
0.200
0.040
1.160
3.680
N
MG/L
30.000
22.000
19.000
4.000
18.900
13.200
8.000
13.000
18.000
17.000
20.000
39.000
31.000
TOTAL
MG/L
21.000
9.900
11.600
1.600
4.500
11.100
3.500
7.000
12.300
14.300
10.000
14.000
16.880
ORTHO
MG/L P
1.790
1.700
1.890
1.700
1.050
1.040
1.600
1.240
2.200
0.160
1.850
0.930
4.100
RATE FLOW-MGO
MG/L P INST MGD MONTHLY
3.150
3.000
2.800
2.100
3.600
' 1.700
2.500
2.200
2.800
2.100
3.600
1.850
4.900
2.250
2.500
1.500
1.800
1.990
2.000
2.400
1.000
2.000
2.400
2.100
1.000
2.150
2.500
2.100
1.800
1.800
1.500
2.100
2.500
1.600
2.000
2.000
2.000
-------
STORET RETRIEVAL DATE 74/11/37
090451 SF090451 P000500
41 46 00.0 072 18 30.0
MANSFIELD
09 7.5 S COVENTRY
T/EAGLEVILLE LAKE
WILLIMANTIE RIVER
11EPALES 2141204
4 0000 FEET DEPTH
DATE
FROM
TO
73/01/02
CP(T)-
73/01/02
73/02/06
CP(T)-
73/02/06
73/03/06
CP-
73/03/06
73/04/06
CP(T)-
73/04/06
73/04/30
CP(T)-
73/05/01
7.1/06/05
cpm-
73/06/05
73/07/03
CP(T)-
73/07/03
73/08/07
73/09/04
73/10/02
73/11/06
73/12/05
74/01/21
00630
TIME DEPTH N02&N03
OF N-TOTAL
DAY FEET MG/L
08
15
09
14
08
16
08
15
09
15
09
15
Ofl
15
10
10
14
11
10
00
00
10
20
00
00
00
00
00
00
00
00
00
00
30
30
10
00
00
0
0
1
0
3
3
6
5
Q
3
9
0
1
.930
.430
.470
.760
.100
.260
.400
.500
.400
.900
.300
.440
.920
00625
TOT KJEL
N
MG/L
11
6
11
16
3
20
2
1
0
7
0
15
8
.500
.500
.800
.100
.570
.000
.940
.030
.620
.000
.700
.000
.900
00610 00671
NH3-N PHOS-DIS
TOTAL OPTHO
MG/L MG/L P
1.400
1.370
7.980
6.200
1.745
3.180
1.010
0.280
3.400
0.300
5.000
2.400
1.800
3.700
3.800
3.600
5.200
7.530
5.500
3.300
5.520
7.200
4.900
6.200
2.240
00665 50051 50053
PHOS-TOT FLOW CONDUIT
RATE FLOW-MGD
MG/L P INST MGD MONTHLY
3.100
4.300
4.300
5.000
5.450
7.900
5.700
7.300
5.900
10.500
5.200
7.200
3.500
0.394
0.489
0.359
0.410
0.298
0.289
0.263
0.225
0.225
0.235
0.230
0.232
0.500
0.355
0.391
0.407
0.421
0.365
0.310
0.241
0.381
0.300
0.300
0.220
0.300
0.350
------- |