U.S. ENVIRONMENTAL PROTECTION AGENCY
NATIONAL EUTROPHICATION SURVEY
WORKING PAPER SERIES
REPORT
ON
LAKE MINNEJONKA
MINNESOTA
EPA REGION V
WORKING PAPER No,
PACIFIC NORTHWEST ENVIRONMENTAL RESEARCH LABORATORY
An Associate Laboratory of the
NATIONAL ENVIRONMENTAL RESEARCH CENTER - CORVALLIS, OREGON
and
NATIONAL ENVIRONMENTAL RESEARCH CENTER - LAS VEGAS, NEVADA
697.032
-------
REPORT
ON
LAKE MINNETONKA
MINNESOTA
EPA REGION V
WORKING PAPER No,
WITH THE COOPERATION OF THE
MINNESOTA POLLUTION CONTROL AGENCY
AND THE
MINNESOTA NATIONAL GUARD
JULY, 1975
-------
1
CONTENTS
Page
Foreword ii
List of Minnesota Study Lakes iv, v
Lake and Drainage Area Map vi
Sections
I. Introduction 1
II. Conclusions 1
III. Lake Characteristics, 3
IV. Lake Water Quality Summary 4
V. Algal Assay 8
VI. Waste Sources 10
VII. Literature Reviewed 11
VIII. Appendices 12
-------
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 [ 3O3(e)], water
quality criteria/standards review [ 3O3(c)], clean lakes [ 3l4(a,b)],
and water quality monitoring [ lO6 and §305(b)] activities mandated
by the Federal Water Pollution Control Act Amendments of 1972.
* The lake discussed in this report was included in the National
Eutrophication Survey as a water body of interest to the Minnesota
Pollution Control Agency. Tributaries were not sampled, and this
report relates only to the data obtained from lake sampling.
-------
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 Minnesota Pollution Control
Agency for professional involvement and to the Minnesota National
Guard for conducting the tributary sampling phase of the Survey.
Grant J. Merritt, Director of the Minnesota Pollution Control
Agency, John F. McGuire, Chief, and Joel G. Schilling, Biologist,
of the Section of Surface and Groundwater, Division of Water Quality,
provided invaluable lake documentation and counsel during the course
of the Survey; and the staff of the Section of Municipal Works, Divi-
sion of Water Quality, were most helpful in identifying point sources
and soliciting municipal participation in the Survey.
Major General Chester J. Moeglein, the Adjutant General of
Minnesota, and Project Officer Major Adrian Beltrand, who directed
the volunteer efforts of the Minnesota National Guardsmen, are also
gratefully acknowledged for their assistance to the Survey.
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iv
NATIONAL EUTROPHICATION SURVEY
STUDY LAKES
STATE OF MINNESOTA
LAKE NAME COUNTY
Albert Lea Freeborn
Andrusia Beltrarni
Badger Polk
Bartlett Koochiching
Bear Freeborn
Bemidji Beltrami
Big Stearns
Big Stone Big Stone, MN; Roberts,
Grant, SD
Birch Cass
Blackduck Beltrami
Blackhoof Crow Wing
Budd Martin
Buffalo Wright
Calhoun Hennepin
Carlos Douglas
Carrigan Wright
Cass Beltrami, Cass
Clearwater Wright, Stearns
Cokato Wright
Cranberry Crow Wing
Darling Douglas
Elbow St. Louis
Enibarass St. Louis
Fall Lake
Forest Washington
Green Kandiyohi
Gull Cass
Heron Jackson
Leech Cass
Le Honime Dieu Douglas
Lily Blue Earth
Little Grant
Lost St. Louis
-------
V
LAKE NAME COUNTY
Madison Blue Earth
Malmedal Pope
Mashkenode St. Louis
McQuade St. Louis
Minnetonka Hennepin
Minnewaska Pope
Mud Itasca
Nest Kandiyohi
Pelican St. Louis
Pepin Goodhue, Wabasha, MN;
Pierce, Pepin, WI
Rabbit Crow Wing
Sakatah Le Sueur
Shagawa St. Louis
Silver McLeod
Six Mile St. Louis
Spring Washington, Dakota
St. Croix Washington, MN; St. Croix,
Pierce, WI
St. Louis Bay St. Louis, MN; Douglas, WI
Superior Bay St. Louis, MN; Douglas, WI
Swan Itasca
Trace Todd
Trout Itasca
Wagonga Kandiyohi
Wailmark Chisago
White Bear Washington
Winona Douglas
Wolf Beltrami, Hubbard
Woodcock Kandiyohi
Zunibro Olmstead, Wabasha
-------
Map Location
LAKE MINNETONKA
X Lake Sampling Site
Sewage Treatment Plant
-------
LAKE MINNETONKA
STORET NO. 2760
I. INTRODUCTION
Lake Minnetonka was included in the National Eutrophication Survey
as a water body of interest to the Minnesota Pollution Control Agency.
Tributaries were not sampled; and although the con iunlties of Long Lake,
Maple Plain, Mound, and Orono provided monthly wastewater treatment
plant samples and flow data, other nutrient sources were not evaluated.
Therefore, this report primarily relates to the lake sampling data.
Several comprehensive studies of Lake Minnetonka have been done
(Megard, 1970, 1972; Sorensen, 1970, 1971) and provide detailed informa-
tion on the lake.
II. CONCLUSIONS
A. Trophic condition:
Survey data and the reports indicated above show that Lake
Minnetonka is eutrophic. Of the 60 Minnesota lakes sampled in
the fall of 1972 when essentially all were well-mixed, 34 had
less mean total phosphorus, 32 had less mean dissolved phosphorus,
and 40 had less mean inorganic nitrogen. For all samplings of
the 60 lakes, 37 had less mean chlorophyll a, and 29 had greater
mean Secchi disc transparency. Hypolimnetic dissolved oxygen
was markedly depressed or depleted at all of the deeper sampling
stations in June and September.
-------
2
Blue—green algae were dominant in all phytoplankton samples,
and problem algal blooms and rooted aquatic vegetation have been
reported (Ketelle and Uttormark, 1971).
B. Rate—Limiting Nutrient:
The algal assay results indicate Lake Minnetonka was phos-
phorus limited at the time the sample was taken (10/30/72). The
lake data indicate phosphorus limitation in September as well
but nitrogen limitation in June.
C. Point-Source Nutrient Contributions:
Reportedly, six municipal wastewater treatment plants con-
tributed nutrients to Lake Minnetonka during the Survey sampling
year (Megard, 1972). Of these, four provided effluent samples
and flow data (Appendix B), and the calculated annual nutrient
loads contributed by these plants are tabulated below.
Community Total P (ibs) Total N (lbs )
Long Lake 2,470 6,750
Maple Plain 4,010 5,030
Mound 35,510 99,620
Orono 2,320 5,460
-------
III. LAKE CHARACTERISTICS
A. Morphometry*:
1. Surface area: 14,475 acres.
2. Mean depth: 22.5 feet.
3. Maximum depth: 91 feet.
4. Volume: 325,690 acre-feet.
B. Precipitation**:
1. Year of sampling: 24.3 inches,
2. Mean annual: 28.8 inches.
* Megard, 1972.
** See Working Paper No. 1, "Survey Methods, 1972".
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4
IV. LAKE WATER QUALITY SUMMARY
Lake Minnetonka 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 eight stations on
the lake and from a number of depths’ at each station (see map, page vi).
During each visit, a single depth-integrated (15 feet to surface) sample
was composited from the stations for phytoplankton identification and
enumeration; and during the last visit, two five-gallon depth—integrated
samples were composited for algal assays (stations 1, 6, 7, and 8 were
combined, and stations 2, 3, 4, and 5 were combined). Also each time, a
depth-integrated sample was collected from each of the stations for chloro-
phyll a analysis. The maximum depths sampled were 33 feet at station 1,
45 feet at station 2, 22 feet at station 3, 40 feet at station 4, 53 feet
at station 5, 19 feet at station 6, 28 feet at station 7, and 65 feet at
station 8.
The results obtained are presented in full in Appendix A, and the
data for the fall sampling period, when the lake essentially was well-
mixed, are summarized in the following table. 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 A.
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5
A. Physical and chemical characteristics:
FALL VALUES
(10/30/7 2)
Parameter Minimum Mean Median Maximum
Temperature (Cent.) 6.2 7.1 7.3 7.8
Dissolved oxygen (mg/l) 5.0 9.6 10.2 11.6
Conductivity (iimhos) 320 367 370 400
pH (units) 7.3 7.8 7.9 8.1
Alkalinity (mg/i) 126 132 132 137
Total P (mg/l) 0.026 0.065 0.056 0.143
Dissolved P (mg/i) 0.011 0.028 0.021 0.054
NO 2 + N03 (mg/i) 0.020 0.063 0.050 0.190
Ammonia (mg/i) 0.060 0.345 0.370 0.920
ALL VALUES
Secchi disc (inches) 26 54 57 74
-------
6
B. Biological characteristics:
1. Phytoplankton -
Sampling Dominant Number
Date Genera per ml
06/29/72 1. Microcystis 2,767
2. Anabaena 1 ,356
3. Dinobryon 380
4. Chroococcus 362
5. Flagellates 289
Other genera 651
Total 5,805
09/05/72 1. Anabaena 1 ,844
2. Microcystis 741
3. Dictyosphaerium 271
4. Coelosphaerium 271
5. Melosira 217
Other genera 833
Total 4,177
10/29/72 1 . Anabaena 1 ,962
2. Dinobryon 1,358
3. Melosira 528
4. Fragilaria 453
5. Scenedesmus 415
Other genera 1 ,208
Total 5,924
-------
7
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 ( pg/i )
06/29/72 01 26.3
02 12.7
03 12.6
04 14.7
05 15.0
06 13.3
07 12.8
08 9.5
09/05/72 01 11.0
02 11.8
03 12.3
04 8.2
05 14.2
06 14.1
07 24.9
08 9.1
10/29-30/72 01 27.1
02 14.9
03 16.5
04 14.1
05 17.4
06 28.8
07 48.5
08 8.1
-------
8
Spike (mu/i )
Control
0.006
0.012
0.024
0.060
0.060
10.0 N
b. Stations
Spike (mull )
Control
0.006
0.012
0.024
0.060
0.060
10.0 N
Inorganic N
Conc. Lmg/1 )
0.332
0.332
0.332
0.332
0.332
10.332
10.332
Maximum yield
( mg/i-dry wt. )
2.1
5.2
6.3
11.6
11.1
6.6
2.0
Maximum yield
( mg/i-dry wt. )
0.4
5.2
5.2
12.9
14.5
33.7
2.5
V. ALGAL ASSAY
A. Limiting Nutrient Study:
1. Autoclaved, filtered, and nutrient spiked -
a. Stations 1, 6, 7, and 8 -
Ortho P Inorganic N
___________ Conc. (mg/i) Conc. (mg/i )
0.023 0.403
p 0.029 0.403
p 0.033 0.403
p 0.047 0.403
p 0.083 0.403
P + 10.0 N 0.083 10.403
0.023 10.403
2, 3, 4, and 5 —
Ortho P
____________ Conc. (mg/i ) _________
0.022
0.028
0.034
0.046
0.082
0.082
0.082
p
p
p
p
P + 10.0 N
2. Discussion -
The control yields of the autoclaved, filtered assays with
Seienastrum capricornutum , indicate that the potential primary
productivity of Lake Minnetonka was relatively moderate at the
time of the autumn sample collection. The results of the algal
assays suggest that phosphorus was the limiting nutrient in the
-------
9
sample. Increasing phosphorus spikes to about 0.047 mg/i,
increased maximum yields in both algal assays. No growth
response accompanied spikes of nitrogen alone, nor did the
expected yield increase with the simultaneous addition of
phosphorus and nitrogen occur in the first sample.
Phosphorus limitation is not inconsistent with the fall
field samples which had a 14 to 1 ratio of inorganic nitrogen
to dissolved phosphorus.
-------
10
VI. WASTE SOURCES
A. Known municipal* -
Pop. Mean Receiving
Name Served Treatment Flow (mgd) Water
Long Lake 1,506 trickling 0.158 Long Lake Creek
filter
Maple Plain 1,169 act. sludge 0.220 Painter Creek
+ pond
Mound** 7,572 act. sludge 1.287 Lake Langdon
+ pond
Orono 6,787 act. sludge 0.274 French Lake
+ pond
B. Industrial - Unknown
* Anonymous, 1974.
** Connected to the Metropolitan Sewer Board Blue Lake wastewater treatment
plant in 1974; plant discharges to the Minnesota River (Anonymous, 1974).
-------
11
VII. LITERATURE REVIEWED
Anonymous, 1974. Wastewater disposal facilities inventory. MPCA,
Minneapolis.
Ketelle, Martha J., and Paul D. Uttormark, 1971. Problem lakes in
the United States. EPA Water Poll. Contr. Res. Ser., Proj.
16010 EHR.
Megard, Robert 0., 1970. Lake Minnetonka: nutrients, nutrient
abatement, and the photosynthetic system of the phytoplankton.
Interim Rept. 7, U. of Minn. Limnol. Res. Ctr., Minneapolis.
____________ 1972. Phytoplankton, photosynthesis, and phosphorus
in Lake Minnetonka, Minnesota. Limnol. & Oceanogr., vol. 17,
pp. 68-87.
Sorensen, Kenneth E., 1970. Lake Minnetonka comprehensive study;
interim report. Harza Engr. Co., Chicago, for MPCA, Minneapolis.
_______ 1971. A program for preserving the quality of Lake
Minnetonka. Rept. for MPCA, Minneapolis.
-------
VIII. APPENDICES
APPENDIX A
PHYSICAL and CHEMICAL DATA
-------
STORET ETRILVAL r)ATE 74/10/30
276001
44 57 42.0 093 30 36.0
LAKE MINNETONKA
27 MINNESOTA
I1EPALES
2111202
3
0028
FEET DEPTH
DATE
FROM
TO
TIME DF°T -s
OF
DAY FEET
72/06/29
72/09/OS
72/10/30
15 35 0000
15 35 0015
15 35 0025
17 25 0000
12 25 0004
1? 75 0015
12 25 O0 4
09 35 0000
09 35 0004
09 35 0015
09 35 0072
09 35 0033
DATE
FROM
TO
TIME DEPTH
OF
DAY FEET
3’?! 7
Ct-ILP HYL
A
UG/L
72/06/29
72/09/OS
72/10/30
15 35 0000
12 75 0000
09 35 0000
?6.3J
11. OJ
27.IJ
00010
00300
00077
00094
00400
00410
00630
00610
00665
00666
WATER
DO
TRANSP
CNDUCTVY
P1-4
1 ALK
NO2 .NO3
NH3—N
PIIOS—TOT
PHOS-DIS
TEMP
SECCI-41
FIELD
CACO3
N—TOTAL
TOTAL
CENT
MG/L
INCHES
MICROMHO
SU
MG/L
MG/L
MG/L
MG/L P
MG/L P
?2.5
11.0
6P
335
8.40
119
0.060
0.050
0.020
0.014
19.5
140
8.30
122
0.070
0.060
0.032
0.018
13.0
1.2
7?
350
310
7.30
8.35
134
114
0.100
0.050
0.150
0.060
0.032
0.024
0.020
0.010
20.6
4.7
320
8.45
115
0.050
0.070
0.027
0.015
?0.4
7.5
170
8.40
116
0.060
0.090
0.022
0.011
?0.1
7.2
60
140
380
8.50
7.90
119
126
0.060
0.030
0.100
0.120
0.022
0.042
0.012
0.015
7.1
10.2
380
7.90
127
0.030
0.120
0.038
0.011
7.3
10.2
370
7.90
126
0.020
0.120
0.043
0.013
7.5
10.?
360
7.90
127
0.030
0.130
0.042
0.012
7.4
10.2
370
7.90
128
0.030
0.130
0.040
0.013
J VALIW KNOWN TO HE I” ERWOP
-------
STORET RETRIEVAL DATE 74/10/30
276002
44 56 25.0 093 33 36.0
LApcE MINNETONI
-------
STORET RETRIEVAL DATE 74/10/30
276003
44 54 50.0 093 33 57.0
LAKE MINNETONKA
27 MINNESOTA
I IE”ALES
3
2111202
0022 FEET DEPTH
DATE
F ROM
TO
00010
WATER
TEMP
CENT
00300 00077
DO TRANSP
SECCHI
MG/L INCHES
00094
CMDUCTVY
F IELD
MICROMHO
00630
N02&N03
N—TOTAL
MG/L
00610
NH3-N
TOTAL
MG/L
TIME DEPTH
OF
DAY FEET
7?/06/29 16 30 0000
16 30 0020
7?/09/05 13 35 0000
13 35 0004
13 35 0015
13 35 OO1R
77/10/29 16 05 0000
16 05 0004
16 05 0015
16 05 0022
00400 00410
PH T ALK
CACO3
SU MG/L
00665 0061 ,6
P 1OS-TOT PHOS—DIS
MG/L P MG/L P
24.0
74
350
8.40
122
0.100
0.060
0.025
0.014
18.5
5.8
63
360
325
8.00
8.50
129
115
0.080
0.060
0.060
0.070
0.032
0.030
0.013
0.013
70.3
6.4
455
€ .5O
115
0.050
0.060
0.032
0.013
20.0
7.2
325
8.35
114
0.050
0.070
0.025
0.011
70.0
7.4
60
360
180
8.35
7.90
115
131
0.040
0.040
0.070
0.160
0.042
0.048
0.011
0.011
7.4
10.6
400
8.00
128
0.060
0.170
0.054
0.014
7.4
10.4
400
8.00
132
0.040
0.160
0.047
0.015
7.4
10.5
380
8.00
133
0.050
0.160
0.046
0.014
DATE
FROM
To
77/06/29
77/09/OS
72/10/29
TIME DEPTH
OF•
DAY FEET
16 30 0000
13 35 0000
16 05 0000
32217
C HL P H Y L
A
UG/L
1’. 6J
12. 3J
16.5J
J VALUE KNOWN TO BE IN ERROR
-------
STORET RETRIEVAL DATE 74/10/30
276004
44 54 55.0 093 36 48.0
LAKE MINNETONKA
27 MINNESOTA
1 1EPALES
3
2111202
0045 FEET DEPTH
DATE
FROM
TO
72/06/29
72/09/05
72/10/29
TIME DEPTH
OF
DAY FEET
17 00 0000
14 05 0000
15 45 0000
32217
C HL P PH YL
A
(J(,/L
14. 7J
8. J
14. IJ
00010
00300
00077
00094
00400
00410
00630
00610
00665
00666
DATE
TIME
DEPTH
WATER
DO
TRANSP
CNDUCTVY
PH
T
ALK
N02&.N03
NH3—N
PHOS—TOT
PHOS—DIS
FROM
OF
TEMP
SECCHI
FIELD
CACO3
N—TOTAL
TOTAL
TO
DAY
FEET
CENT
MG/L
INCHES
MICROMNO
SI)
MG/L
MG/L
MG/L
MG/L P
HG/L P
72/06/29
17 00 0000
24.0
72
340
8.30
131
0.120
0.060
0.027
0.011
17 00 0020
17.0
360
7.70
135
0.130
0.070
0.028
0.012
17 00 0040
9.0
0.0
390
7.20
148
0.060
0.900
0.216
0.068
7?/09/05
14 05 0000
72
420
8.65
119
0.050
0.060
0.018
0.010
14 05 0004
70.5
6.8
39R
8.70
118
0.060
0.090
0.023
0.012
14 05 0015
20.1
8.1
310
8.55
117
0.060
0.070
0.026
0.015
14 05 0022
20.1
6.6
355
8.30
116
0.050
0.100
0.020
0.011
14 OS 0030
15.7
0.0
360
7.40
143
0.070
0.780
0.031
0.014
14 05 0036
11.7
0.0
440
7.25
1 SB
0.130
2.190
0.245
0.035
7?/10/29
15 45 0000
60
370
8.10
132
0.040
0.060
0.028
0.012
iS 45 0004
6.9
11.2
380
8.10
128
0.050
0.080
0.026
0.012
15 45 0015
7.0
11.2
365
8.10
128
0.040
0.070
0.030
0.012
15 45 0024
7.0
11.0
360
8.10
127
0.040
0.070
0.028
0.012
15 45 0036
7.0
11.2
380
8.10
128
0.040
0.070
0.032
0.013
J VALIW KNOWN TO BE IN ERRON
-------
STORET RETp IEVAL OArE 74/10/10
DATE
FROM
TO
TIME DEPTH
OF
DAY FEET
32217
CHL RPHYL
A
UC ./L
276005
‘.4 54 27.0 093 39 54.0
LAKE MINNETONKA
27 MINNESOTA
I I EPALES
3
72/06/29
7 2/0 9/05
72/10/29
17 20 0000
14 45 0000
15 20 0000
2111202
0025 FEET DEPTH
00010
00300
00077
00094
00400
00410
00630
00610
00665
00666
DATE
TIME
DEPTH
WATER
DO
TRAtsJSP
CNDUCTVY
PH
T ALK
NO2I ,NO3
NH3—N
Pi-IOS—TOT
PHOS—DIS
FROM
OF
TEMP
SECCHI
FIELD
CACO3
N—TOTAL
TOTAL
TO
DAY
FEET
CENT
MG/L
INCHES
MICROMNO
SU
MG/L
MG/L
MG/L
MG/L P
MG/L P
72/06/29
17 20 0000
23.5
42
325
8.60
122
0.200
0.080
0.034
0.015
17 70 0012
21.0
325
8.30
118
0.060
0.070
0.027
0.014
17 70 0025
13.0
0.6
170
7.30
147
0.520
0.100
0.105
0.090
72/09/05
14 45 0000
54
420
8.80
116
0.060
0.070
0.029
0.015
14 45 0004
?0.?
9.5
310
8.75
114
0.060
0.080
0.031
0.017
14 45 0015
19.9
7.5
315
8.07
114
0.050
0.090
0.032
0.015
14 45 0027
19.7
4.4
370
7.75
117
0.050
0.220
0.040
0.020
14 45 0030
13.6
0.0
370
7.55
140
0.160
0.930
0.181
0.120
14 45 0041
8.2
0.0
375
7.40
143
0.140
0.220
0.270
0.199
14 45 0051
7.3
0.0
385
7.30
158
0.160
2.430
0.398
0.348
72/10/29
15 20 0000
52
400
7.80
131
0.070
0.440
0.106
0.048
15 20 000’.
7.7
9.6
400
7.80
133
0.060
0.440
0.103
0.046
15 20 0015
7.6
9.6
400
7.80
132
0.070
0.440
0.118
0.050
15 ?0 0022
7.6
9.6
390
7.80
133
0.070
0.450
0.108
0.050
iS 20 0030
7.6
9.6
400
7.30
134
0.060
0.460
0.114
0.029
15 20 0040
7.6
9.4
380
7.70
133
0.060
0.440
0.111
0.051
15 ?0 0051
7.5
9.1
400
7.70
133
0.070
0.460
0.118
0.054
lS.OJ
14.2J
17 • 4J
J V. L(J — KNO NI It) 3E I
-------
STORET RETRIEVAL DATE 74/1 (1/30
276006
44 55 03.0 093 41 30.0
LAKE MINNETONKA
27 MINNESOTA
L1EPALES 2111202
3 0020 FEET DEPTH
DATE
FROM
TO
TIME DEPTH
OF
DAY FEET
72/06/29 17 45 0000
17 45 0015
72/09/05 15 25 0000
15 25 0004
15 25 0015
15 25 0019
72/10/30 07 35 0000
07 35 0004
07 35 0012
07 35 0018
?3.O
19.0
20.2
19.9
19.9
6.4
6.4
6.4
26
35
48
00010
00300
00077
00094
00400
00410
00630
00610
00665
00666
WATER
DO
TRANSP
CNDUCTVY
PH
1
ALK
N02&N03
NH3-N
PHOS—TOT
PHOS—DIS
TEMP
SECCHI
FIELD
CACO3
N—TOTAL
TOTAL
CENT
MG/L
INCHES
MICPOMHO
SU
MG/L
MG/L
MG/L
MG/L P
MG/L P
0.4
300
350
335
8.50
7.50
8.00
122
150
127
0.110
0.050
0.070
0.100
0.470
0.240
0.055
0.085
0.111
0.028
0.069
0.027
5.5
285
8.00
126
0.080
0.250
0.080
0.027
4.2
300
7.75
128
0.070
0.340
0.099
0.035
4.2
295
340
7.80
7.60
127
133
0.070
0.170
0.320
0.910
0.099
0.073
0.030
0.037
9.0
330
7.60
132
0.170
0.920
0.067
0.037
9.0
320
7.50
134
0.180
0.910
0.081
0.039
8.9
320
7.50
134
0.190
0.920
0.087
0.042
TIME
OF
DAY
DATE
F ROM
TO
72/ 0 6/29
72/ 09/05
7?/ 10/30
32217
DEPTH CHLRPHYL
A
FEET tJG/L
17 45 0000
15 25 0000
07 35 0000
13.3J
14. 1J
2R.8J
J- VALUE KNOWN TO BE IN ERROR
-------
STOPET RETRIEVAL DATE 74/10/30
276007
44 So 45.0 093 38
LAKE MINNEFONKA
27 MINNESOTA
2111202
0024 FEET DEPTH
DATE
FROM
TO
TIME DEPT,-1
OF
DAY FEET
12.0
I LEPALES
3
72/06/29 18 05 0000
18 05 0020
72/09/OS 15 50 0000
15 50 0004
15 50 0015
IS 50 0021
15 50 0078
72/10/30 08 00 0000
08 00 0004
08 00 0015
OR 00 0019
40
29
30
00010
00300
00077
00094
00400
00410
00630
00610
00665
00666
WATER
DO
T ANSP
CNDIJCTVY
‘I- l
T ALK
NO2 .NO3
NH3—N
P1-lOS—TOT
PHOS—DIS
TEMP
SECCI-4 1
FIELD
CACO3
N—TOTAL
TOTAL
CENT
lG/L
INCHES
MICROMHO
SU
MG/L
MG/L
MG/L
MG/L P
MG/L P
1.0
350
395
325
8.50
7.30
8.65
136
157
128
0.060
0.070
0.100
0.050
0.530
0.120
0.039
0.062
0.066
0.019
0.035
0.023
6.6
328
8.30
131
0.080
0.120
0.058
0.027
5.4
328
8.20
131
0.060
0.560
0.067
0.034
1.4
440
7.05
133
0.060
0.580
0.077
0.033
0.0
430
360
7.05
8.00
198
136
0.170
0.100
6.300
0.390
0.665
0.072
0.449
0.022
11.t
340
8.00
135
0.080
0.370
0.055
0.019
11.0
350
8.10
135
0.080
0.360
0.070
0.022
11.6
350
8.10
133
0.110
0.390
0.073
0.021
24.0
16.0
p0.4
19.8
19.5
35.2
6.2
6.2
32217
CHLPP I-UVL
A
IJC,/L
12.RJ
24 • 9J
4%.SJ
DATE
FROM
TO
72/06/29
72/09/OS
77/ 10/30
TIME OE TN
OF
DAY FEET
18 05 0000
15 50 0000
08 00 0000
J V’ LLJ KNOWN TO RE IN ERROR
-------
STOPET PETRIEVAL DATF 7’/1O/30
276008
44 56 36.0 093 36 30.0
LAKE MINNETONKA
27 MINNESOTA
1 IEPALES
3
2111202
0062 FEET DEPTH
DATE
FROM
TO
7?/06/29
72/09/05
72/10/30
TIME DEPTH
0F
DAY FEET
18 15 0000
17 10 0000
08 20 0000
32217
CHLR°I-IYL
A
UG/L
9.5J
9. IJ
8. IJ
00010
00300
00077
00094
00400
00410
00630
00610
00665
00666
DATE
TIME
DEPTH
WATFR
DO
TRANSP
CNDUCTVY
PH
T
ALK
NO? .NO3
NH3—N
PHOS-TOT
PHOS—DIS
FROM
OF
TEMP
SECCHI
FIELD
CACO3
N—TOTAL
TOTAL
TO
DAY
FEET
CENT
MG/L
INCHES
MICPOMHO
SIJ
MG/L
MG/L
MG/I
MG/L P
MG/L P
72/06/29
18 15 0000
23.5
46
330
8.30
117
0.070
0.060
0.025
0.013
18 15 0010
22.0
335
8.30
121
0.060
0.070
0.032
0.014
18 15 0025
7.0
380
7.30
147
0.210
0.120
0.025
0.016
18 15 0060
5.0
0.2
400
7.10
157
0.060
1.100
0.212
0.204
72/09/05
17 30 0000
68
325
8.70
17 30 0004
11.’
9.0
323
8.70
17 30 0015
8.0
2.6
400
7.50
17 30 0024
0.’
0.1
380
7.55
152
0.060
0.340
0.027
0.013
72/10/30
08 20 0000
3f
380
7.40
136
0.040
0.430
0.061
0.040
08 20 0004
6.8
8.2
360
7.30
137
0.040
0.440
0.062
0.050
08 20 0015
6.8
8.2
340
7.30
136
0.040
0.430
0.056
0.039
08 20 0025
6.8
8.0
340
7.30
135
0.040
0.430
0.062
0.041
08 20 0035
6.
7.8
340
7.30
135
0.040
0.440
0.066
0.043
08 20 0045
6.8
5.0
350
7.30
136
0.040
0.440
0.061
0.041
08 20 0055
6.6
5.0
360
7.30
135
0.040
0.430
0.062
0.042
08 20 0065
6.3
7,8
360
7.40
135
0.080
0.500
0.143
0.039
J VALUE KNOWN TO BE IN ERROR
-------
APPENDIX B
SEWAGE TREATMENT PLANT
DATA
-------
STORET RETRIEVAL DATE 74/10/30
276051 6S27 ( ’051 P001169
45 00 00.0 093 39 00.0
MAPLE PLAIN
21019 15 POCI
-------
STORET RFT IEVA1 DATh 7 ./10/30
76052 AS276 052
44 57 30.0 095 35 00.0
OR 0 NO
27 15 LK MINNETONKA
T/LAISE MINNETONKA
UNNAMEI) T I
11 EPALES
4
P0 00350
DEPTH
2141204
0000 FEET
00430
006 ?5
00610
00671
00665
50051
50053
DATF
TIME
1)E TH
‘ O? NO
TOT KJFL
N’-13-N
PIIOS—DIS
PHOS-TOT
FLOW
CONDUIT
FROM
OF
\J—TOTI IL
N
TOTAL
OPT 1-10
RATE
FLOW—M&D
TO
nAY
FEFT
‘ iG/L
Mç,/p
MG/L
MC’/L P
MG/L
INST MGf)
MONTHLY
71/0?/26
11
00
C (T)—
1’.600
10.1100
0.60(1
4.100
0.249
0.264
73/O2/2f
13
00
73/03/06
11
00
CP(T)—
8.1’JJ
6.900
0. 90
2.500
?.7 00
0.333
0.257
71/03/06
13
00
7l/06/0 .
11
no
4.300
‘. 00
0.039
?.000
2.200
0.301
0.392
73/05/03
11
00
0.515
1.C00
0.390
1.260
1.400
0.365
0.327
71/06/01
11
00
CP(T)—
3.656
.“O0
0.126
1.141
1.200
0.312
0.308
73/06/01
13
00
71/07/0?
ii
00
0.190
1.100
0.180
0.R?0
1.100
0.281
0.280
71/0 /07
11
00
CP(T)—
0.061
1.760
0.054
0.535
1.100
0.273
0.235
73/0 /07
1.3
00
73/09/OS
1.1
00
CP(T)—
3.800
0.255
0.240
7 /09/05
ii
no
73/10/04
11
00
CP(T)—
0.2Y1
3.000
0.075
4.700
4.800
0. S0
0.225
73/10/04
1.3
00
73/11/0’
11
00
CP(T)—
2.310
i. ’ - 00
0.110
3.600
3.900
0.250
0.235
73fl1/0
13
00
73/1?/03
11
00
CD(T)_
9fl1)
73/1?/03
1.3
00
1.500 0.’?0 3.100 3.400
0.280 0.250
-------
ST )PET 2ETPIFVAI flAT 1’ /1U/30
71/02/? 11 10
CP (T) -
73/02/2 13 00
73/01/0 - ii 0 ’
73/0’./04 -
73/05/01 11 30
7i/Q - /Qi Ii 0(1
CP (1) —
71/06/01 t 00
71/07/02 II 0
71/04/07 II 00
CP (T) -
71/OM/07 Il (‘0
71/09/05 ii 00
CP (1)—
7 3 /Q /Ø 13 00
71/10/04 11 00
CP (T) -
73/10/04 13 00
71/11/0? II 00
C (TI —
71/1l/0 11 00
71/12/01 1) 00
CP (T) -
73/17/03 11 00
?7b 053 TF?76053
44 5’4 00.0 O’ 3 33 10.0
LO J6 LAKE
?7 IS LK r4INNETUNKA
f/LAKE MINNETONKA
L0N( LAKt CPEEK
1 1EPALES
4
DATE
FROM
TO
(i U 43 (
TIME DIPTH NO NO3
or N—TOTAL
r)AY FEET MG/L
P001506
0 0 6 /1
P-,OS—f)IS
T Hr)
MC,/L P
TOT KJEL
4G/L
3?. 10 1.
I • ‘00
. 250
2141204
0000 FEET DEPTH
O I f-)t)
NH 1-N
TOTAL
1 6 / t
? I • 000
17.?o0
• 35()
(..034
0oet 5 50051
HOS-TOT FLOW
PATE
MG/L P INST M6D
0 • 0 ‘40
I .0’ J
• 3’90
0 • 11 )
• 4 r
• 440
50053
CONOULT
FLOw-MGD
MONTHLY
p1.000 10.250
10 .‘00
1 .050
I • 750
0.122
0 • 20 1
0.195
0.204
10.500
7.100 u. 4 8 0
0.140 10.000 0.?40
Q.30 fl.500 O. 20
3.100 0.108
1 I) • 00 (
0.71?
1.500
2.640
1 • 760
1.540
1.600
0.153
0.155
0.180
0.156
0.220
2.900
0.150
4.200
0.134
0.150
7.100
0. 138
0.1 ,0
4.100
0.221
0.143
L•5Ø)
0.125
0.120
‘ .17’) 17.010 1.7M0 3.570
0.150 0.160
-------
STOPET RETRIEVAL DATE 74/10/30
276054 AS276054 P007572
44 5 00.0 093 40 00.0
MO(JND
27 iS LI< HINNETONKA
7/LAKE MINNETONKA
LAN000N LAP(E
1 IEPALES 2141204
4 0000 FEET DEPTH
00630 00625 00610 00671 00665 50051 50053
DATE TINE DEPTH NO2ANO3 TOT KJEL NH3-N PHOS—DIS PHOS—TOT FLOW CONDUIT
FROM OF N—TOTAL N TOTAL O Tt-IO RATE FLOW—MOD
TO DAY FEET NG/L MG/L MG/L MG/L P MG/L P INST MOD MONTHLY
73/02/26 11 00
CP(T)— 0.020 32.000 14.700 7.800 8.150 1.100 1.120
73/02/26 13 00
73/03/06 11 00
CP(T)— 0.010K 25.000 12.200 7.000 7.800 1.350 1.260
73/03/06 13 00
73/04/04 ii 00
CP(T)— 0.050 22.000 9.100 2.520 6.800 1.260 1.270
73/04/04 13 00
73/05/03 11 00
CP(T)— 0.050 24.000 8.300 2.915 7.700 1.370 1.310
73/05/03 13 00
73/06/01 ii 00
CP(T)— 0.190 24.000 9.350 6.950 8.600 1.330 1.240
73/06/01 13 00
73/07/02 11 00
CP IT)— 0.100 25.200 6.200 5.590 9.600 1.140 1.130
73/Q7/02 13 00
73/08/14 II 00
CP(T)— 0.020 23.000 2.000 3.000 12.500 1.190 1.120
73/08/14 13 00
73/09/05 II 00
CP(T)— 0.042 24.700 4.500 6.000 1.270 1.220
73/09/05 13 00
73/10/05 Ii 00
CP(T)— 0.090 31.000 7.925 2.255 9.950 1.500 1.580
73/10/OS 13 00
73/11/02 ii 00
CP(T)— 0.150 28.000 13.000 2.400 10.000 1.540 1.550
73/11/02 13 00
73/12/03 ii 00
CP(T)— 0.140 26.000 13.000 7.600 9.100 1.240 1.250
73/12/03 13 00
76/0I/O 11 00
CP(T)— 0.200 19.000 i3. 0O 9.000 9.450 1.430 1.390
74/01/On 13 00
K VALUE KNOWN TO BE LESS
THAN INDICATED
------- |