U.S. ENVIRONMENTAL PROTECTION AGENCY
NATIONAL EUTROPHICAT10N SURVEY
WORKING PAPER SERIES
REPORT
ON
LAKE LAMOILLE
LAMOILLE COUNIY
VERMONT
EPA REGION I
WORKING PAPER No, 16
PACIFIC NORTHWEST ENVIRONMENTAL RESEARCH LABORATORY
An Associate Laboratory of the
NATIONAL ENVIRONMENTAL RESEARCH CENTER • CORVALLIS, OREGON
and
NATIONAL ENVIRONMENTAL RESEARCH CENTER - LAS VEGAS, NEVADA
it GPO 697.032
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REPORT
ON
LAKELAMOILLE
LATOILLE COUNIY
VERMONT
EPA REGION I
WORKING PAPER No, 16
WITH THE COOPERATION OF THE
VERMONT AGENCY OF ENVIRONMENTAL CONSERVATION
AND THE
VERMONT NATIONAL GUARD
JULY,
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1
CONTENTS
Page
Foreword ii
List of Vermont Study Lakes iv
Lake and Drainage Area Maps v, vi
Sections
I. Conclusions 1
II. Introduction 3
III. Lake and Drainage Basin Characteristics 4
IV. Lake Water Quality Summary 5
V. Nutrient Loadings 10
VI. Literature Reviewed 17
VII. Appendices 18
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11
FOREWORD
The National Eutrophication Survey was initiated in 1972 as a
research project in response to an Administration commitment to
investigate the nationwide 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 fresh water 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, in fact, 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
This report documents the first stage of evaluation of lake and
watershed data collected from the study lake and its drainage basin.
It is formatted to provide state environmental agencies with specific
information for basin planning [ 3O3(e)J, water quality criteria!
standards review [ g303(c)}, clean lakes [ 5314(a,b)], and water quality
monitoring [ flO6 and §305(b)] activities mandated by the Federal Water
Pollution Control Act Amendments of 1972.
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111
Beyond the single lake analysis, broader based correlations
between nutrient concentrations (and loading) and trophic
condition 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.
AC KNOWL EDGMENT
The staff of the National Eutrophication Survey (Office of
Research & Development, U. S. Environmental Protection Agency)
expresses sincere appreciation to the Vermont Agency of Environmental
Conservation for professional involvement and to the Vermont National
Guard for conduct of the tributary sampling phase of the Survey.
Martin L. Johnson, Secretary of the Vermont Agency of Environmental
Conservation; Gordon R. Ryper, Commissioner of the Water Quality
Division; David L. dough, Director, James W. Morse II, Biologist, and
Wally McLean, Sanitary Engineer of the Water Quality Division, provided
invaluable lake documentation and counsel during the study. Reginald
A. LaRosa, Director of the Water Supply and Pollution Control Division,
and James F. Agan, Chief of the Operations Section of the Environmental
Engineering Division, were most helpful in arranging for the sampling
of wastewater treatment plants involved in the Survey.
Major General Reginald M. Cram, the Adjutant General of Vermont,
and Project Officer Major Howard Buxton, who directed the volunteer
efforts of the Vermont National Guardsmen, are also gratefully
acknowledged for their assistance to the Survey.
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iv
NATIONAL EUTROPHICATION SURVEY
STUDY LAKES
STATE OF VERMONT
LAKE NAME COUNTY
Arrowhead Mountain Lake Chittenden, Franklin
Clyde Pond Orleans
Harriman Reservoir Windham
Lake Champlain Addison, Chittenden,
Franklin
Lake Lamoille Lamoille
Lake Memphremagog Orleans
Waterbury Reservoir Washington, Lamoille
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V
LAKE LAMOILLE
Tributary Sampling Site
Lake Sampling Site
Map Location
440 28’
720 34
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v i
LAKE LAMOILLE
® Tributary San 1ing Site
X Lake Sampling Site
,‘ Direct Drainage Area Limits
0 1 2 3M
Scale
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LAKE LAMOILLE
STORET NO. 5007
I. CONCLUSIONS
A. Trophic Condition:
Survey data show that Lake Lamoille is eutrophic. The lake
had moderate nutrient and chlorophyll a values and only fair
Secchi disc readings. The algal assay test indicated the poten-
tial primary productivity in Lake Lamoille was moderately high
when sampled, and algal blooms have been noted. During the time
of maximum growth, an estimated 20 percent of the lake bottom
supported rooted aquatic plants.
The apparent trophic condition of Lake Lamoille is greatly
influenced by the very short hydraulic detention time of one
day which suppresses the effects of very high nutrient loading
rates.
B. Rate-Limiting Nutrient:
The algal assay test indicates the rate-limiting nutrient
in Lake Lamoille was phosphorus. Nitrogen-to-phosphorus ratios
observed during lake sampling support this conclusion.
C. Nutrient Controllability:
1. Point sources--During the sampling year, Lake Lamoille
received a total phosphorus load at a rate more than five times
greater than a eutrophic rate (see page 14). Of this load, it
is estimated that the villages of Hardwick and Morrisville
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2
contributed about 29%. However, it is calculated that even
complete removal of phosphorus at these point sources would
still leave a loading rate nearly four times greater than a
eutrophic rate, and it is concluded that point-source control
would not result in a significant improvement in the trophic
condition of Lake Lamoille unless non—point export loads can
be reduced.
At this time, construction of secondary treatment facilities
at Morrisville has been completed, and plans have been approved
for secondary treatment at Hardwick.
2. Non-point sources--The mean non-point phosphorus exports
of the streams tributary to Lake Lamoille are somewhat higher
than the tributary exports of other Vermont lakes studied (see
pages 14 and 15).
The very high export rate of the unnamed brook indicates an
urban drainage impact or possibly sewage discharges or septic tank
overflows. On the other hand, there are no population centers
in the Ryder Brook drainage, and the relatively high phosphorus
export rate at least in part is probably due to agricultural prac-
tices in the drainage.
The very high drainage area/lake area ratio of 1,121/1 will
insure an excessive phosphorus load to Lake Lamoille unless non—
point phosphorus sources can be controlled.
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3
II. INTRODUCTION
Lake Lamoille is a relatively small impoundment of the Lamoille River
located in Lamoille County ,just northwest of the village of Morrisville.
The lake was formed in 1942 by the construction of a 25-foot head dam by
the Morrisville Light Company for the generation of hydroelectric power.
There is practically no development on the shoreline of Lake Lamoille,
and the lake has limited recreational use. In a recent report (Anderson,
1971), it is noted that the lake supports very little fishing and that it
is a poor fishery resource.
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4
III. LAKE AND DRAINAGE BASIN CHARACTERISTICS
A. Lake Morphometry:
1. Surface area: 153 acres.
2. Mean depth: 5.5 feet.
3. Maximum depth: 21 feet.
4. Volume: 842 acre/feet.
5. Mean hydraulic retention time: 1 day.
B. Tributary and Outlet:
(See Appendix A for flow data)
1 . Tributaries -
Name Drainage area* Mean flow*
Lamoille River 238.0 mi 2 388.0 cfs
Ryder Brook 18.7 mi 2 30.5 cfs
Unnamed Brook 7.6 mi 2 12.4 cfs
Minor tributaries & 2
immediate drainage - 3.5 mi - 6.0 cfs
Totals 267.8 mi 2 436.9 cfs
2. Outlet -
Lamoille River 268.0 mi 2 ** 436.9 cfs
C. Precipitationi
1. Year of sampling: 52.2 inches.
2. Mean annual: 41.2 inches.
Drainage areas are accurate within ±1%; gaged flows are accurate within
±15%, and ungaged flows are accurate within ±20%.
** Includes area of lake.
t See Working Paper No. 1, ‘Survey Methods”.
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5
IV. LAKE WATER QUALITY SUMMARY
Lake Lamoille was sampled three times during the open-water season
of 1972 by means of a pontoon-equipped Huey helicopter. Each time, sam-
ples for physical and chemical parameters were collected from two stations
on the lake and from two or more depths at each station (see map, page v).
During each visit, a single depth-integrated (near bottom to surface) sam-
ple was collected from the stations for phytoplankton identification and
enumeration; and during the last visit, a single five-gallon depth-integrated
sample was collected for algal assays (this sample was lost in shipment; and
in May, 1973, personnel of the Vermont Department of Water Resources collected
a similar sample for algal assays). Also each time, a depth-integrated
sample was collected from each of the stations for chlorophyll a analysis.
Maximum depths sampled were 5 feet at station 1 and 18 feet at station 2.
The results obtained are presented in full in Appendix B; and the data
for the fall sampling period, when the lake was essentially well-mixed,
are summarized below. Note, however, the Secchi disc summary is based on
aall values.
For differences in the various parameters at the other sampling times,
refer to Appendix B.
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6
A. Physical and chemical characteristics:
FALL VALUES
(10/05/72)
Median Maximum
Secchi disc (inches)
B. Biological characteristics:
1 . Phytoplankton -
Sampling
Date
06/02/ 72
46 59
Domi nant
Genera
1. Fragilaria
2. Synedra
3. Cymbelia
4. Dinobryon
5. Navicula
57 72
Number
per ml
940
886
705
579
217
470
3,797
1 . Dinobryon
2. Anabaena
3. Navicula
4. Cymbelia
5. Polycystis
Other genera
1 ,320
1 ,085
.., -I
452
325
1 ,429
Parameter
Minimum
Mean
Temperature (Cent.)
11.1
12.1
11.5
13.5
Dissolved oxygen (mg/i) 9.6
9.9
9.8
10.2
Conductivity (j.imhos)
128
135
138
140
pH (units)
7.0
7.2
7.1
7.3
Alkalinity (mg/i)
38
40
41
41
Total P (mg/i)
0.013
0.019
0.019
0.026
Dissolved P (mg/i)
0.007
0.009
0.009
0.010
NO + NO (mg/i)
Am onia mg/l)
0.210
0.040
0.230
0.060
0.230
0.060
0.250
0.080
ALL VALUES
Total
Other genera
08/02/72
Total
5,208
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7
Sampling
Date
10/05/7 2
Dominant
Genera
1. Dinobryon
2. Achnanthes
3. Cymbella
4. Flagellates
5. Fragilaria
Other genera
Number
per ml
1 ,262
565
471
414
301
2,015
5,028
2. Chlorophyll a -
(Because of instrumentation problems
the following values may be in error
during the
by plus or
1972 sampling,
minus 20 percent.)
Sampling
Date
06/02/72
08/02/72
10/05/72
Station
Number
01
02
01
02
01
02
Chlorophyll a
(pg/l)
6.2
not done
3.0
6.6
1.0
0.9
C. Limiting Nutrient Study:
1. Autoclaved, filtered, and nutrient spiked -
Total
Ortho
P
Inorganic N
Maximum yield
N/P
Conc.
(mg/l)
Conc. (mg/l)
(mg/i-dry wt.)
Ratio
Spike (mg/l )
Control
0.010 p
0.020 P
0.050 P
0.050 P + 5.0 N
0.050 P + 10.0 N
10.0 N
0.014
0.024
O . 034
0.064
0.064
0.064
0.014
O . 500
O . 500
0.500
0.500
5.500
10.500
10.500
1.9
5.8
8.0
9.9
19.9
22.3
1.5
36/1
21/1
15/1
8/1
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8
2. Discussion -
The control yield of the assay alga, Selenastrum capri-
cornutum , indicates that the potential primary productivity
of Lake Lamoille was moderately high at the time the sample
was collected. Also, the increased yields with increased
levels of orthophosphorus (to about 36 pg/i--an N/P ratio of
14/1) indicates that the lake was phosphorus limited. Note
that the addition of only nitrgen resulted in a yield not
significantly different than the control yield.
The lake data indicate phosphorus limitation in June and
August as well (N/P ratios were 19/1 and 20/1 , respectively,
and phosphorus limitation would be expected).
D. Trophic Condition:
Survey data and the records of others show that Lake Lamoille
is eutrophic. Chlorophyll a values were moderate, Secchi disc
readings were only fair, nutrient concentrations were moderate, and
the algal assay indicated a moderately high potential for primary
production (the mean hydraulic retention time of the lake is a
very short one day; this accounts for the moderate nutrient con-
centrations in spite of very high nutrient loading rates).
Survey limnologists observed an algal bloom in progress in
August, 1972, and noted that aquatic vegetation was common in
the shallow areas of the lake.
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9
Survey sampling at depth was somewhat limited, but some
depression of dissolved oxygen occurred at station 2 in July,
1972. However, in another study (Anderson, 1971), marked
dissolved oxygen depression with depth (to 3.8 mg/i at 20
feet) was observed.
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10
V. NUTRIENT LOADINGS
(See Appendix C for data)
For the determination of nutrient loadings, the Vermont National
Guard collected monthly near-surface grab samples from each of the tribu-
tary sites indicated on the map (page vi), except for the high runoff
months of April and May when two samples were collected. Sampling was
begun in July, 1972, and was completed in June, 1973.
Through an interagency agreement, stream flow estimates for the year
of sampling and a ‘normalized” or average year were provided by the New
England District Office of the U.S. Geological Survey for the tributary
sites nearest the lake.
In this report, nutrient loads for sampled tributaries were deter-
mined by using a modification of the U.S. Geological Survey computer
program for calculating stream loadings (IISTATPAC”)*. Nutrient loadings
for unsampled “minor tributaries and immediate drainage” (“72” of U.S.G.S.)
were estimated by using the nutrient loads, in lbs/mi 2 /year, in Ryder Brook
at station 31 and multiplying by the 77 area in mi 2 .
The villages of Hardwick and Morrisville did not participate in the
Survey, and nutrient loads were estimated*.
The Village of Hardwick is about 16 stream miles above Lake Lamoille,
and Hardwick Lake and two small impoundments intervene. Consequently, in
this report, it is assumed that 50% of the estimated total phosphorus
* See Working Paper No. 1, “Survey Methods”.
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11
load and 10% of the estimated total nitrogen load from Hardwick were
sedimented and/or biologically assimilated in the intervening waters during
the sampling year. In the following tables, the nutrient loads attributed
to the Lanioille River are those measured at station 26 minus the esti-
mated Hardwick loads.
A. Waste Sources:
1. Known municipal -
Name
Pop.*
Served
Treatment
Flow (mgd)
Hardwick
1 ,503
None
0.150
Morrisville
2,116
None
0.212
2. Known md
ustrial -
None
Recel vi ng
Water
Lanioille River
& Cooper Brook
Lake Lamoille
* Estimated; see Working Paper No. 1, “Survey Methods”.
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12
B. Annual Total Phosphorus Loading - Average Year:
1. Inputs -
lbs P/ % of
Source yr total
a. Tributaries (non—point load) —
Lamoille River 20,230 58.8
Ryder Brook 1,810 5.3
Unnamed Brook 1,970 5.7
b. Minor tributaries & immediate
drainage (non-point load) - 340 1.0
c. Known municipal —
Hardwick 2,630 7.6
Morrisville 7,410 21.5
d. Septic tanks - None known —
e. Known industrial - None -
f. Direct precipitation* - 20 < 0.1
Total 34,410 100.0
2. Outputs -
Lake outlet - Lamoille River 27,390
3. Net annual P accumulation - 7,020 pounds
* Estimated; see Working Paper No. 1, “Survey Methods”.
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13
C. Annual Total Nitrogen Loading - Average Year:
1 . Inputs —
lbsN/ %of
Source yr total
a. Tributaries (non-point load) -
Lamoille River 549,880 78.2
Ryder Brook 71,600 10.2
Unnamed Brook 34,550 4.9
b. Minor tributaries & immediate
drainage (non-point load) - 13,400 1.9
c. Known municipal -
Hardwick 12,720 1.8
Morrisville 19,890 2.8
d. Septic tanks - None known
e. Known industrial — None -
f. Direct precipitation* - 1 ,470 0.2
Total 703,510 100.0
2. Outputs -
Lake outlet - Lamoille River 667,070
3. Net annual N accumulation - 36,440 pounds
* Estimated; see Working Paper No. 1, Survey Methods”.
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14
D. Mean Annual Non-point Nutrient Export by Subdrainage Area:
Tributary lbs P/mi 2 /yr lbs N/mi 2 /yr
Lamoille River 85 2,310
Ryder Brook 97 3,829
Unnamed Brook 259 4,550
E. Yearly Loading Rates:
In the following table, the existing phosphorus loading
rates are compared to those proposed by Vollenweider (1973).
Essentially, his “dangerous” rate is the rate at which the
receiving waters would become eutrophic or remain eutrophic;
his “permissible” rate is that which would result in the
receiving water remaining oligotrophic or becoming oligo-
trophic if morphometry permitted. A mesotrophic rate would
be considered one between “dangerous” and “permissible”.
Total Phosphorus Total Nitrogen
Units Total Accumulated Total Accumulated
lbs/acr /yr 224.9 45.9 4,598.1 238.2
grams/rn /yr 25.21 5.14 515.4 26.7
Vol1e weider loading rates for phosphorus
(g/m /yr) based on mean depth and mean
hydraulic retention time of Lake Lamoille:
“Dangerous” (eutrophic rate) 4.60
“Permissible” (oligotrophic rate) 2.30
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15
F. Nutrient Controllability:
1. Point sources--During the sampling year, Lake Lamoille
received a total phosphorus load at a rate more than five times
that proposed by Vollenweider as dangerous (i.e., a eutrophic
rate). Of this load, it is calculated that the villages of Hard-
wick and Morrisville contributed about 29%.
It is estimated that even 100% phosphorus removal at the above
sources would still leave a loading rate in excess of 158 lbs/acre!
yr or 17.8 g/m 2 /yr (nearly four times greater than the eutrophic
rate). Therefore, it is concluded that phosphorus control at the
villages of Hardwick and Morrisville would not result in a signifi-
cant improvement in the trophic condition of Lake Lamoille.
At the time of preparation of this report, construction of
secondary wastewater treatment facilities at the Village of Morris-
yule has been completed, and plans for the construction of second-
ary facilities at the Village of Hardwick have been approved.
2. Non-point sources--The mean non-point phosphorus exports
of the streams tributary to Lake Lamoille were somewhat higher
than the tributary exports of other Vermont lakes studied (mean
= 52 lbs/mi 2 /yr; range 30-65 lbs/mi 2 /yr).
The unnamed brook had a mean phosphorus export about three times
the exports of the Lamoille River and Ryder Brook (see page 14).
The lower portion of the brook flows through the Village of
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16
Morrisville, and the high phosphorus load may have been due to
urban drainage (storm drains and/or street drainage) but is indi-
cative of sewage discharges or septic tank overflows to the brook.
The Ryder Brook drainage has no population centers, and the
relatively high phosphorus export rate at least in part reflects
the agricultural practices in the drainage.
It appears that the very high drainage area/lake area ratio
of 1,121/1 will insure an excessive phosphorus load to Lake Lamoille
unless non-point phosphorus sources are amenable to control . it is
calculated that the phosphorus export of the Lamoille River alone
would result in a loading rate to the lake of more than 130 lbs/
acre/yr or nearly 15 g/m 2 /yr (more than three times the eutrophic
rate).
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17
VI. LITERATURE REVIEWED
Anonymous, 1968. Report on water quality and pollution control of
the Lamoille River basin. VT Dept. Water Resources, Montpelier.
Anderson, Jon K., 1971. Fisheries resources of Lake Lamoille. Publ.
#7, VT Dept. Fish & Game, Montpelier.
Farnum, Will, 1973. Personal comunication (status of Morse Dairy,
Morrisville). VT Dept. Water Resources, Montpelier.
Morse, James W., 1974. Personal communication (status of Vermont
water pollution control facilities, Jan., 1974). VT Dept.
Water Resources, Montpelier.
Vollenweider, Richard A., 1973. Input-output models. Canada Centre
for Inland Waters, Burlington, Ontario.
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18
VII. APPENDICES
APPENDIX A
TRIBUTARY FLOW DATA
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1R19’JTA9Y FLOW INFORMATION FO VERMONT 7/9/74
LA
-------
1 I 3IITA ’( FL0 INFOr MAT1ON FO ? V kMONT
1/9/ 74
LA
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APPENDIX B
PHYSICAL and CHEMICAL DATA
K — Value is less than indicated
J - Value known to be in error
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STORET RETRIEVAL DATE 74/07/02
500701
44 34 00.0 072 36 26.0
LAMOILLE LAI(E
SO VERMONT
IIEPALES 2111202
0005 FEET
DATE TIME DEPTH
FROM OF
TO DAY FEET
72/06/02 14 36 0000
14 36 0005
72/08/02 18 40 0000
18 40 0004
72/10/05 13 30 0000
13 30 0004
DATE TIME DEPTH
FROM OF
TO DAY FEET
32217
CHLRPHYL
A
UG/L
00665 00666
PHOS—TOT PHOS—DIS
MG/I P MG/ I. P
72/06/02 14 36 0000
72/08/02 18 40 0000
72/10/05 13 30 0000
6. 2J
3.OJ
1 • OJ
3
WATER
DO
TRANSP
CNDUCTVY
PH
7
ALK
NO2&NO3
NH3-N
TEMP
SECCHI
FIELD
CACO3
N—TOTAL
TOTAL
CENT
MG/L
INCHES
HICRONHO
SU
DEPTH
14.7
9.4
60
120
7.60
40
0.150
0.010
14.0
10.2
48
iao
160
7.65
7.10
45
59
0.150
0.200
0.010
0.060
0.018
0.012
0.012
19.3
9.5
72
160
128
7.70
7.15
59
38
0.190
0.210
0.060
0.050
0.026
0.018
0.016
11.5
9.8
128
7.15
0.008
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STr)qET WEIHIEVAL UATE 74/01/02
-‘00 fOP
4’. 3’. 24.0 01? 1 , ‘p.o
LA ’4’)ILLE LA’ F
50
72/06/0? 1’ 55 0000
14 55 0018
72/07/31 18 50 0000
18 50 000’.
18 50 0011
72/10/05 13 50 0000
13 50 0004
13 50 0014
17.6
16.6 8.8
21.5 9.6
70.0 7.6
13.5 10.2
11.1 9.6
I IFPALFS
3
2111202
0016 FF T flF?TH
32717
DATE TIME DE 8 TH CHLMPHYL
FROM OF A
TO DAY FEET DOlL
DATE
TIME DEPTH WATEP
no
TPANSP
CNDUCTVY
4
T ALPS
‘d025H(j3
“DST(JI
P”- ,OS-uIS
FPO’4
OF
TFMP
SECCHI
FIELD
CACOT
H—TOTAL
TOTAL
To
DAY
FEET
CENT
M( /L
INCHES
MICPOMHO
SD
4’,/L
‘ 4 f’IL
-lO/L
‘IO/L
‘.‘
U
‘
54
160
7.80
48
O.I’lO
0.040
0.01?
0.008
140
1.70
50
O.IMO
0.080
0.02j
0.008
46
ISO
8.10
47
0.1’.0
0.060
0.017
0.Olt)
150
7.70
49
0.190
0.070
0.018
0.010
155
7.80
49
0.240
0.110
‘).017
0.OLO
72
140
7.30
‘.1
0.250
0.060
0.02j
0.010
138
7.30
41
v.240
0.040
0.01’.
0.009
140
7.05
41
3.230
0.080
0.026
0.010
77/07/31 lB 50 0000
72/ 10/OS 13 50 0000
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APPENDIX C
TRIBUTARY and WASTEWATER
TREATMENT PLANT DATA
K - Value is less than indicated
J - Value known to be in error
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STORET RETRIEVAL DATE 74/07/02
500721 LS500721
44 33 30.0 072 37 00.0
EAST BRANCH (LAMOILLE R)
50 15/HYDE PARK
I/LAKE LAMOILLE
THIRD BRIDGE WEST OF MORRISVILLE
11EPALES 2111204
4 0000 FEET DEPTH
00630 00625 00610 00671 00665
DATE TIME DEPTH NO2 NO3 TOT KJEL NH3—N PHOS—DIS PHOS—TOT
FROM OF N—TOTAL N TOTAL ORTHO
TO DAY FEET MG/L MG/L MG/L MG/L P MG/L P
7?/07/15 11 30 0.236 0.500 0.024 0.007 0.035
7?/OR/12 09 15 0.290 0.870 0.075 0.018 0.085
72/09/10 08 17 0.170 0.850 0.080 0.013 0.062
72/10/15 08 20 0.310 0.350 0.100 0.007 0.033
7?/11/05 09 35 0.220 0.600 0.063 0.006 0.023
7?/i2/03 09 05 0.680 0.480 0.040 0.011 0.048
73/02/03 09 00 0.830 0.660 0.240 0.006
73/04/08 12 40 0.570 0.630 0.160 0.011 0.030
73/04/21 13 35 0.520 0.370 0.040 0.007 0.020
73/05/05 15 15 0.240 0.540 0.072 0.014 0.060
71/05/05 0.231 0.350 0.034 0.006 0.020
73/06/24 12 35 0.170 0.560 0.066 0.005K 0.045
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STORET RETRIEVAL DATE 74/07/02
500722 LS500722
44 33 30.0 072 37 30.0
WEST BRANCH (LAMOILLE R)
50 15/HYDE PARK
I/LAKE LAMOILLE
BRIDGE W OF MORRISVILLE
1LEPALES 2111204
4 0000 FEET DEPTH
00630 00625 00610 00671 00665
DATE TIME DEPTH NO2 NO3 TOT KJEL NH3—N PHOS—DIS PHOS—TOT
FROM OF N—TOTAL N TOTAL ORTHO
TO DAY FEET MG/L MG/L MG/L MG/L P MG/L P
7?/07/15 0.143 0.687 0.041 0.013 0.036
7?/08/12 09 55 0.156 0.390 0.040 0.012 0.025
7?/09/10 08 35 0.299 0.500 0.075 0.019 0.036
7?/10/15 09 15 0.300 0.350 0.100 0.006 0.025
7?/I1/05 09 30 0.560 0.520 0.084 0.006 0.024
7?/12/03 11 05 0.336 0.710 0.025 0.010 0.042
73/02/03 09 15 0.430 0.520 0.220 0.007 0.010
73/04/08 12 65 0.340 0.280 0.040 0.010 0.020
73/04/21 13 45 0.250 0.480 0.063 0.007 0.025
73/05/05 15 25 0.198 0.3’O 0.023 0.006 0.025
73/05/20 11 20 0.168 0.310 0.014 0.006 0.020
71/06/24 12 55 0.460 0.540 0.088 0.006 0.035
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STORET RETRIEVAL DATE 74/07/02
500723 LS500723
44 3’. 30.0 072 37 30.0
LAMOILLE RIVER MAIN STREAM
50 15/HYDE PARK
0/LAKE LAMOILLE
HWY BRIDGE IN CADYS FALLS
11EPALES 2111204
4 0000 FEET DEPTH
00630 00625 00610 00671 00665
DATE TIME DEPTH N02&N03 TOT KJEL NH3—N PHOS—DIS PHOS—TOT
FROM OF N—TOTAL N TOTAL ORTHO
TO DAY FEET MG/L MG/L MG/L MG/L P HG/L P
72/07/15 10 00 0.104 0.675 0.057 0.012 0.051
72/08/12 09 05 0.185 0.920 0.059 0.0 12 0.050
77/09/10 08 25 0.200 0.500 0.085 0.011 0.046
77/10/15 08 25 0.260 0.300 0.110 0.008 0.032
7?/11/05 10 00 0.210 0.340 0.063 0.008 0.028
7?/!2/03 OR 35 0.320 0.310 0.026 0.010 0.019
73/01/06 09 25 0.690 0.500 0.054 0.009 0.030
73/02/03 09 45 0.399 0.580 0.176 0.007 0.010
73/03/03 09 10 0.420 0.380 0.147 0.009 0.030
73/04/08 12 35 0.340 0.690 0.160 0.010 0.020
73/04/21 13 40 0.250 0.480 0.056 0.007 0.030
73/ 5/05 14 55 0.189 0.420 0.039 0.005K 0.035
73/05/20 11 10 0.176 0.355 0.022 0.006 0.020
73/06/24 12 46 0.160 0.500 0.044 0.00 5K 0.045
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STORET RETRIEVAL DATE 74/07/02
500726 LS500726
44 33 25.0 07? 34 00.0
LAMOILLE RIVER MAIM STREAM
50 15/HYDE PARK
I/LAKE LAMOILLE
ST RI 15A BRIDGE E OF MOPRISVILLE
11EPALES 2111204
4 0000 FEET DEPTH
00630 00625 00610 00671 00665
DATE TIME DEPTH NO2&N03 TOT KJEL NH3—N PHOS—DIS PHOS—TOT
FROM OF N-TOTAL N TOTAL ORTHO
TO DAY FEET MG/L MG/L MG/L MG/L P MG/L P
72/08/1? 09 30 0.130 1.230 0.034 0.005K 0.020
72/09/10 08 50 0.240 0.375 0.042 0.009 0.019
72/10/15 08 50 0.280 0.250 0.088 0.005K 0.016
72/11/05 09 00 0.211 0.840 0.083 0.009 0.085
72/12/03 08 05 0.294 0.280 0.012 0.006 0.006
73/02/03 08 25 0.390 0.305 0.048 0.009 0.065
73/03/03 08 05 0.378 0.007 0.030
73/04/OR 1 30 0.330 0.520 0.081 0.014 0.015
73/04/21 13 25 0.240 0.580 0.120 0.007
73/05/05 14 45 0.180 0.290 0.015 0.005K 0.020
7V05/20 11 00 0.147 0.300 0.008 0.00 5K 0.015
73/06/24 12 10 0.160 0.480 0.039 0.005K 0.035
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STORET RETRIEVAL DATE 74/07/02
500731 LS500731
44 33 00.0 072 37 30.0
RYDER BROOK
50 15/HYDE PARK
T/LAKE LAMOILLE
1ST CONCRETE BRIDGE AbOVE MOUTH
11EPALES 2111204
4 0000 FEET DEPTH
00630 00625 00610 00671 00665
DATE TIME DEPTH NO? .NO3 TOT KJEL NH3—N PHOS—DIS PHOS-TOT
FROM OF N—TOTAL N TOTAL ORTHO
TO DAY FEET MG/L MG/L MG/L MG/L P MG/L P
72/07/15 0.813 1.550 0.044 0.018 0.037
7?/08/12 09 45 0.447 0.915 0.075 0.015 0.041
7?/09/10 08 15 0.950 0.300 0.056 0.015 0.027
72/10/15 08 05 0.600 0.950 0.087 0.008 0.048
7?/lI/05 09 20 0.590 0.300 0.058 0.007 0.025
72/12/03 09 30 0.610 0.400 0.028 0.008 0.014
73/01/06 08 45 0.370 0.260 0.042 0.009 0.020
73/02/03 0.790 0.540 0.069 0.006 0.050
73/03/03 08 45 0.990 0.390 0.189 0.006 0.040
73/04/OR 12 48 0.550 0.500 0.063 0.018 0.020
73/04/21 14 05 0.520 0.500 0.031 0.007 0.020
73/05/05 15 10 0.410 0.340 0.021 0.005K 0.025
73/05/20 11 40 0.410 0.500 0.056 0.006 0.015
73/06/24 13 05 0.460 0.600 0.067 0.005K 0.035
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STORET RETRIEVAL DATE 74/07/02
500741 LS500741
44 33 00.0 072 36 30.0
NO 4AME
50 15/HYDE PARK
T/LAKE LAMOILLE
ST RI 100 BRIDGE S OF MORRISVILLE
1 IEPALES 2111204
4 0000 FEET DEPTH
00630 00625 00610 00671 00665
DATE TI’4E DEPTH NO? NO3 TOT KJEL NH3—N PHOS—DIS PHOS—TOT
FROM OF N-TOTAL N TOTAL ORTHO
TO DAY FEET MG/L MG/L MG/L MG/I P MG/L P
7?/07/15 09 55 0.563 1.150 0.088 0.082 0.170
72/08/12 08 50 0.475 1.150 0.145 0.040 0.146
7?/09/10 08 04 0.930 0.750 0.231 0.048 0.110
72/10/15 08 00 0.600 0.650 0.140 0.022 0.069
72/11/05 09 10 0.672 0.630 0.147 0.027 0.065
72/12/03 09 41 0.780 0.640 0.069 0.024 0.058
73/01/06 08 35 0.820 0.460 0.080 0.021 0.055
73/02/03 08 45 0.830 0.950 0.115 0.021 0.125
73/03/03 08 30 1.100 0.760 0.273 0.044 0.100
73/04/08 12 50 0.650 0.690 0.147 0.021 0.045
73/04/21 13 55 0.560 O.4 0 0.063 0.015 0.035
73/05/05 15 00 0.520 0.380 0.058 0.013 0.035
73/05/20 11 33 0.S10 0.390 0.038 0.013 0.035
73/06/24 13 12 0.420 1.130 0.440 0.011 0.060
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