U.S. ENVIRONMENTAL PROTECTION AGENCY
NATIONAL EUTROPHICATION SURVEY
WORKING PAPER SERIES
REPORT
ON
GULL LAKE (SOUTH BASIN)
CASS AND CROW WING COUNTIES
MINNESOTA
EPA REGION V
WORKING PAPER No, 102
PACIFIC NORTHWEST ENVIRONMENTAL RESEARCH LABORATORY
An Associate Laboratory of the
NATIONAL ENVIRONMENTAL RESEARCH CENTER - CORVALLIS, OREGON
and
NATIONAL ENVIRONMENTAL RESEARCH CENTER - LAS VEGAS, NEVADA
ifOPO— C97.O3Z
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REPORT
ON
GULL LAIC (SOUTH BASIN)
CASS AND CR3W WING COUNTIES
MINNESOTA
EPA REGION V
WORKING PAPER No, 102
WITH THE COOPERATION OF THE
MINNESOTA POLLUTION CONTROL AGENCY
AND THE
MINNESOTA NATIONAL GUARD
JULY, 1975
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1
CONTENTS
Page
Foreword ii
List of Minnesota Study Lakes tv, v
Lake and Drainage Area Map vi
Sections
I. Conclusions 1
II. Lake and Drainage Basin Characteristics 3
III. Lake Water Quality Summary 4
IV. Nutrient Loadings 9
V. Literature Reviewed 13
VI. Appendices 14
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ii
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 [ 5106 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 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 Beltrami
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
Embarass St. Louis
Fall Lake
Forest Washington
Green Kandiyohi
Gull Cass
Heron Jackson
Leech Cass
Le Hornme Dieu Douglas
Lily Blue Earth
Little Grant
Lost St. Louis
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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
Walimark Chisago
White Bear Washington
Winona Douglas
Wolf Beltranii, Hubbard
Woodcock Kandiyohi
Zumbro Olmstead, Wabasha
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Lake Shore S
Map Location
GULL LAKE
Tributary Sampi I ng
Lake Sampling Site
I-
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GULL LAKE (SOUTH BASIN)
STORET NO. 2737
I. CONCLUSIONS
A. Trophic Condition:
Survey data indicate that the south basin of Gull Lake is
eutrophic. Of the 60 Minnesota lakes on which sampling was
completed, 18 had less and one the same mean total phos-
phorus, 27 had less and one the same mean dissolved phosphorus,
23 had less mean inorganic nitrogen, 27 had less and one the
same mean chlorophyll a, but only eight had greater mean Secchi
disc transparency. Hypolimnetic dissolved oxygen was markedly
depressed at all three sampling stations in July and was depleted
or nearly so below 30 feet in depth in September, 1972.
While phytoplankton numbers were not exceptionally high, blue-
green algae were prominent in all samples.
B. Rate-Limiting Nutrient:
The algal assay results indicate Gull Lake was nitrogen
limited at the time the sample was taken (10/24/72). The lake
data also indicate nitrogen limitation at that time but indicate
phosphorus limitation in July and September.
C. Nutrient Controllability:
1. Point sources--There were no known municipal wastewater
treatment plants impacting Gull Lake during the sampling year.
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2
The Village of Pequot Lakes, about 8 miles north of Gull Lake,
is served by stabilization ponds, but there is no discharge
from the system (Schilling, 1975).
Septic tanks serving shoreline dwellings were estimated to
have contributed about 4% of the total phosphorus load to the
lake, but a shoreline survey would be necessary to determine
the actual significance of these sources.
It is calculated that Gull Lake received a total phosphorus
load at a rate less than that proposed by Vollenweider (in press)
as an oligotrophic rate (see page 12). However, the existing
trophic condition of the lake indicates that either the loading
rate must have been higher in the past or the true loading rate
was not determined by Survey sampling. It seems more likely
that the latter is the case, and a need for further study of the
lake is indicated.
2. Non-point sources--Survey data indicate that upper Gull
Lake contributed nearly 51% of the total annual phosphorus load
to the south basin of Gull Lake. The origin of the phosphorus
load from upper Gull Lake is not known; but if the load could be
significantly reduced, it is believed the water quality of the
south basin of Gull Lake would be improved.
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II. LAKE AND DRAINAGE BASIN CHARACTERISTICS
A. Lake Morphometry :
1. Surface area: 9,540 acres.
2. Mean depth: 30 feet.
3. Maximum depth: 86 feet.
4. Volume: 286,200 acre-feet.
5. Mean hydraulic retention time: 2.9 years.
B. Tributary and Outlet:
(See Appendix A for flow data)
1. Tributaries -
Drainage Mean
Name area (mi2)* flow (cfs)*
Dade Lake connection 8.5 3.7
Upper Gull Lake connection 200.0 98.2
Round Lake connection 52.6 19.9
Minor tributaries &
immediate drainage - 20.0 13.0
Totals 281.1 134.8
2. Outlet -
Gull River 296.0** 134.9
C. Precipitation***:
1. Year of sampling: 32.7 inches.
2. Mean annual: 27.5 inches.
t Affeldt. 1971.
* Drainage areas are accurate within ±5%; mean daily flows are accurate
within ±10%; and ungaged flows are accurate within ±10 to 25% for
drainage areas greater than 10 mi2.
** Includes area of lake.
*** See Working Paper No. 1, "Survey Methods, 1972".
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4
III. LAKE WATER QUALITY SUMMARY
Gull 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 three 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, a single five-gallon depth-
integrated sample was composited for algal assays. Also each time, a
depth-integrated sample was collected at each of the stations for chloro-
phyll a analysis. The maximum depths sampled were 60 feet at station 1,
40 feet at station 2, and 66 feet at station 3.
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 in the following table. Note, however, the Secchi
disc summary is based on all samples.
For differences in the various parameters at the other sampling times,
refer to Appendix B.
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5
A. Physical and chemical characteristics:
FALL VALUES
(10/24/72)
Parameter Minimum Mean Median Maximum
Temperature (Cent.) 7.3 7.6 7.7 7.8
Dissolved oxygen (mg/i) 9.4 10.6 10.2 12.4
Conductivity ( imhos) 208 214 212 220
pH (units) 7.7 7.8 7.8 7.9
Alkalinity (mg/i) 99 105 105 107
Total P (mg/i) 0.017 0.034 0.037 0.052
Dissolved P (mg/i) 0.010 0.024 0.027 0.036
NO 2 + NO 3 (mg/i) 0.030 0.040 0.040 0.050
Ammonia (mg/i) 0.110 0.120 0.120 0.160
ALL VALUES
Secchi disc (inches)
77 91
84 120
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6
B. Biological characteristics:
1. Phytoplankton —
Sampling Dominant Number
Date Genera per ml
07/02/72 1. Tabellaria 1,392
2. Microcystis 958
3. Fragilaria 416
4. Oocystis 307
5. Flagellates 271
Other genera 688
Total 4,032
09/05/72 1. Microcystis 714
2. Anabaena 542
3. Dinobryon 443
4. Lyngbya 344
5. Aphanocapsa 316
Other genera 498
Total 2,857
10/24/72 1. Flagellates 2,906
2. Dinobryon 1 ,358
3. Fragilaria 981
4. Anabaena 868
5. Chroococcus 490
Other genera 2,831
Total 9,434
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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 )
07/02/72 01 17.6
02 13.1
03 10.2
09/05/72
Spike (mg/i )
Control
0.005 P
0.010 P
0.020 P
0.050 P
0.050 P + 10.0 N
10.0 N
Maximum yield
( mg/i-dry wt. )
2.4
2.3
2.5
2.6
2.7
29.5
5.4
2. Discussion -
The control yield of the assay alga, Selenastrum capri-
cornutum , indicates that the potential primary productivity
of Lower Gull Lake was moderate at the time of sampling
(10/24/72). Also, the results indicate the lake was nitrogen
10/24/72
01 8.3
02 4.8
03 8.8
01 19.1
02 16.3
03 14.0
C. Limiting Nutrient Study:
1. Autoclaved, filtered, and nutrient spiked -
Ortho P Inorganic N
___________ Conc. (mg/i) Conc. (mg/i )
0.029 0.131
0.034 0.131
0.039 0.131
0.049 0.131
0.079 0.131
0.079 10.131
0.029 10.131
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8
limited at that time. No growth response accompanied spikes
of phosphorus alone, but the addition of nitrogen alone stimu-
lated growth significantly.
The lake data substantiate nitrogen limitation at the time
of assay sample collection (the N/P ratio was 6/1) but indicate
phosphorus limitation In July (N/P 16/1) and September (N/P =
16/1).
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9
IV. NUTRIENT LOADINGS
(See Appendix C for data)
For the determination of nutrient loadings, the Minnesota National
Guard collected monthly near-surface grab samples from each of the
tributary sites indicated on the map (page vi), except for the high
runoff months of April and May when two samples were collected. Samp-
ling was begun in October, 1972, and was completed in September, 1973.
Through an interagency agreement, stream flow estimates for the
year of sampling and a “normalized” or average year were provided by
the Minnesota District Office of the U.S. Geological Survey for the
tributary sites nearest the lake.
In this report, nutrient loads for sampled tributaries were calcu-
lated from mean annual concentrations and mean annual flows. Nutrient
loadings for “minor tributaries and immediate drainage” (“ZZ” of U.S.G.S.)
were estimated by using the means of the nutrient concentrations in the
Dade Lake connection (station B—i) and the Round Lake connection (station
D-i) and the mean annual ZZ flow.
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10
A. Annual Total Phosphorus Loading - Average Year:
1. Inputs —
lbsP/ %of
Source yr total
a. Tributaries (non-point load)
Dade Lake connection 120 1.5
Upper Gull Lake connection 5,220 64.5
Round Lake connection 550 6.8
b. Minor tributaries & immediate
drainage (non-point load) - 380 4.7
c. Known municipal STP’s - None —
d. Septic tanks* - 330 4.1
e. Known industrial - None -
f. Direct precipjtation** - 1,490 18.4
Total 8,090 100.0
2. Outputs -
Lake outlet - Gull River 5,050
3. Net annual P accumulation — 3,040 pounds
* Estimate based on 285 lakeshore dwellings and 25 resorts (Affeldt, 1971);
see Working Paper No. 1.
** See Working Paper No. 1.
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11
B. Annual Total Nitrogen Loading - Average Year:
1. Inputs —
lbsN/ %of
Source yr total
a. Tributaries (non-point load)
Dade Lake connection 5,670 1.8
Upper Gull Lake connection 158,720 50.7
Round Lake connection 25,780 8.2
b. Minor tributaries & immediate
drainage (non-point load) - 18,380 5.9
c. Known municipal STP’s - None - -
d. Septic tanks* - 12,570 4.0
e. Known industrial - None - -
f. Direct precipitation** - 91,910 29.4
Total 313,030 100.0
2. Outputs —
Lake outlet - Gull River 193,070
3. Net annual N accumulation - 119,960 pounds
* Estimate based on 285 lakeshore dwellings and 25 resorts (Affeldt, 1971);
see Working Paper No. 1.
** See Working Paper No. 1.
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12
C. Mean Annual Non-point Nutrient Export by Subdrainage Area:
In butary 1 bs P/mi 2 /yr 1 bs N/mi 2 /yr
Dade Lake connection 14 667
Upper Gull Lake connection 26 794
Round Lake connection 10 490
D. 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 waters would become eutrophic or remain eutrophic; his
“permissible” rate is that which would result in the receiving
water remaining oligotrophic or becoming oligotrophic if mor-
phometry permitted. A mesotrophic rate would be considered one
between “dangerous” and “permissible”.
Total Phosphorus Total Nitrogen
Total Accumulated Total Accumulated
lbs/acre/yr 0.85 0.32 32.8 12.6
grams/m 2 /yr 0.10 0.04 3.7 1.4
Vollenweider loading rates for phosphorus
(g/m 2 /yr) based on mean depth and mean
hydraulic retention time of Gull Lake:
“Dangerous” (eutrophic rate) 0.34
“Permissible” (oligotrophic rate) 0.17
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13
V. LITERATURE REVIEWED
Affeldt, Craig, 1971. Report on investigation of water quality
of the Gull Lake Chain, Cass and Crow Wing Counties. MPCA,
Minneapolis.
Schilling, Joel, 1975. Personal communication (Pequot Lakes
wastewater treatment system). MPCA, Minneapolis.
Vollenweider, Richard A. (in press). Input-output models. Schweiz.
Z. Hydrol.
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VI APPENDICES
APPENDIX A
TRIBUTARY FLOW DATA
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TP1HUTA Y FLOw iNFO MAT1ON FOP MINNESOTA 10/30/74
LAKE CODE 2737 GULL LAKE
TOTAL DRAINAGE AREA OF LAKE 2q6.00
SUB—DRAINAGE NORMALIZED FLOWS
TRIBUTARY AREA JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC MEAN
2737A 1 296,00 125.20 123.80 131.90 197.20 186.70 189.40 129.00 91.50 97.60 106.30 108.90 131.90 134.90
273781 8.50 1.26 l.6 2.26 5.97 5.6 5.26 3.69 3.36 3.02 5.90 4.07 2.61 3.74
2737C 1 200.00 6.50 98.00 83.60 162.00 148.00 129.00 93.40 94.50 65.00 140.00 11.40 86.80 98.25
2737D1 52.60 4.33 6.39 10.30 39.60 33.80 32.80 22.10 17.80 14.40 26.50 20.00 10.00 19.87
2737ZZ 35.20 5.30 7.18 8.71 24.90 20.30 21.80 13.10 10.30 9.07 15.70 11.30 8.68 13.04
SUMMARY
TOTAL DRAINAGE AREA OF LAKE 296.00 TOTAL FLOW IN = 1617.30
SUN OF SUB—DRAINAGE AREAS 296.30 TOTAL FLOW OUT = 1619.40
MEAN MONTHLY FLOWS AND DAILY FLOWS
TRIBUTARY MONTH YEAR MEAN FLOW DAY FLOW DAY FLOW DAY FLOW
2737A1 10 72 111.00 15 BQ.00
11 72 359.00 18 370.00
1? 72 194.00 22 177.00
1 73 162.00 6 320.00
2 73 99.00 4 120.00
3 73 163.00 26 165.00
4 73 101.00 9 75.00 24 180.00
5 73 234.00 4 2 Q.00 20 100.00
6 73 97.00 11 180.00
7 73 162.00 13 100.00
8 73 218.00 17 340.00
9 73 94.90 17 40.00
273781 10 72 3.25 15 3.30
11 72 5.17 18 4.80
12 72 3.14 22 3.10
1 73 2.21 6 2.20
2 73 1.66 4 1.70
3 73 6.78 26 8.80
4 73 4.98 9 4.70 24 5.80
5 73 6.30 4 6.30 20 5.60
6 73 4.50 11 4.90
7 73 3.91 13 3.80
8 73 1.68 17 1.80
9 71 2.36 17 2.20
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T’JIr4IITARY FLU ’ 1 fO -1ATIUN FO ‘\iINNESOTA
10/30/74
A’(F CO )F 2717
ILL LAKE
MEL bJ M J’JT— LY L ) ‘‘- A i;) IL ‘
T IPJTA Y
‘-I3NTH
Yt.A -
ft A FL H
‘AY
FL J
DAY
FLOW DAY FLOW
7737C1
10
7
77•’fl
1
79.0)
J
7
14c. 0
I L
!3 -.0 ’ )
1’
77
1O- .(.,fl
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10 ,.C0
1
73
114.”’
117.0i
2
7 1
- “. (
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3
3
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2
3? • (j
4
73
1 3 . O
9
12 .0O
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1 7.00
73
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4
16S.00
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147.00
7
11.’ (‘
1)
120.00
7
73
‘ °.O0
13
47.00
73
47.2C
17
‘ 0.00
9
73
“.7O
17
+l.00
?737fl 1
10
11
1
1
7
1
4
S
6
7
Q
72
72
72
73
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73
73
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7
71
71
73
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7.
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3 .L0
33 .’Q
37•. 0
2 -4.13
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11.?0
1
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4
9
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11
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17
17
IS.0’)
? +,Oo
12.00
7.60
e.60
40.0’)
11.00
3fj.00
31.00
23.00
9.40
10.0
24
20
38.00
34.00
273777
JO
11
J7
1
7
3
4
5
6
7
7 - ’
77
73
71
71
71
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34.0)
1 i.00
23.00
20.00
1’+.0 )
5.50
6.E0
24
2C
2’..00
20.00
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APPENDIX B
PHYSICAL and CHEMICAL DATA
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STORET RETRIEVAL DATE 74/10/30
273701
46 28 42.0 094 19 12.0
GULL LAKE
27 MINNESOTA
11EPALES 2111202
3 0060 FEET DEPTH
00010 00300 00077 00094 00400 00410 00630 00610 00665 00666
DATE TIME DEPTH WATER DO TRANSP CNDUCTVY PH T ALK NO2 NO3 NH3—N PHOS—TOT PHOS—DIS
FROM OF TEMP SECCHI FIELD CACO3 N—TOTAL TOTAL
TO DAY FEET CENT MG/L INCHES MICROMHO SU MG/L MG/L MG/L MG/L P MG/I P
72/07/02 11 05 0000 21.0 8.2 120 190 8.50 100 0.040 0.040 0.022 0.009
11 05 0015 17.5 8.2 195 7.90 101 0.040 0.040 0.022 0.009
11 05 0030 11.5 4.3 205 7.30 104 0.160 0.040 0.014 0.010
11 05 0060 8.0 1.0 210 7.00 118 0.300 0.160 0.049 0.029
72/09/05 13 27 0000 18.8 108 195 8.55 95 0.050 0.070 0.013 0.008
13 27 0004 18.8 8.5 190 8.55 93 0.040 0.060 0.013 0.007
13 27 0015 18.4 8,0 190 8.55 94 0.040 0.050 0.011 0.007
13 27 0030 17.4 6.4 195 8.15 119 0.040 0.050 0.011 0.007
13 27 0045 11.3 0.4 218 7.30 123 0.050 0.240 0.045 0.013
72/10/24 13 30 0000 77 210 7.80 106 0.040 0.120 0.017 0.010
13 30 0004 7.7 9.9 208 7.80 105 0.040 0.120 0.034 0.025
13 30 0015 7.7 10.2 208 7.80 107 0.040 0.120 0.043 0.029
13 30 0025 7.5 10.2 210 7.80 107 0.040 0.120 0.041 0.030
13 30 0035 7.3 9.4 208 7.70 107 0.040 0.120 0.044 0.032
13 30 0046 7.5 10.0 212 7.70 107 0.040 0.120 0.052 0.036
32217
DATE TIME DEPTH CHLRPHYL
FROM OF A
TO DAY FEET UG/L
72/07/02 11 05 0000 17.6J
72/09/05 13 27 0000 8.3J
72/10/24 13 30 0000 19. IJ
J VALUE KNOWN TO BE IN ERROR
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ST3PET ‘ ETR1FvAL DATE 74/10/30
‘7370?
46 ? 4M.0 094 20 3’..0
hULL LAXE
27 M INNFSOTA
1IEPALES 2111202
3 0045 FEET DEPTH
00010 00 0 00077 00094 00400 00410 00630 00 ’St O 00665 00666
OATF TIu r)FPT-4 ATE 1)0 19AJ’ISP CNDIICTVY Pr4 r ALt( NO2 NO3 NH3-N P’iOS—TOT Pi- OS—L)1S
FROM OF TEMP SECCHI FIFLI) CACO3 N—TOTAL TOTAL
TO DAY FET CENT M( /L INC’4ES MICROMI-40 SU M6/L MG/L MG/L H&/L P MG/L P
7?/07/07 11 30 0000 ‘l. 7. P4 190 99 0.050 0.040 0.020 0.010
11 10 0024 15.0 7.0 200 104 0.060 0.050 0.023 0.010
11 30 0040 9•5 1.2 ?OS 104 0.260 0.080 0.154 0.012
7?/o9/O 11 01 0000 IM.’ 9f 190 8.50 Il ? 0.040 0.060 0.018 0.010
13 01 0004 1 .S 187 8.50 112 0.040 0.040 0.017 0.008
13 03 0015 !F .0 7.6 19C 8.40 110 0.040 0.050 0.012 0.008
I] 03 0030 17. ‘.6 195 4.3O 111 0.040 0.050 0.013 0.007
7?/I0/?4 14 05 00’ 0 78 220 7.90 105 0.040 0.110 0.017 0.011
1’. 05 0004 7. 12.4 21? 7.90 106 0.040 0.110 0.034 0.023
14 05 0015 7.5 11.0 218 7.90 105 0.040 0.110 0.030 0.022
3??1 7
nATE TIME OEQTH CHL PHYL
FPOM OF A
T ) hAY FFFT ‘JG/L
7?/07/0’ II 10 0000 13.LJ
7?/09/OS I l 01 0000 4.HJ
72/10/24 14 05 0000 1€.3J
J ALIJE KNOWN TO E I ’i F.? Q).
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STORET RETRIEVAL DATE 74/10/30
273703
46 25 42.0 094 21 57.0
GULL LAKE
27 MINNESOTA
1 1EPALES 2111202
3 0050 FEET DEPTH
00010 00300 00077 00094 00400 00410 00630 00610 00665 00666
DATE TIME DEPTH WATER DO TRANSP CNDUCTVY PH T ALK P’402&N03 NH3—N PHOS—TOT PHOS—OIS
FROM OF TEMP SECCHI FIELD CACO3 N—TOTAL TOTAL
TO DAY FEET CENT MG/L INCHES MICROMHO SU MG/L MG/L MG/I MG/I P MG/L P
72/Ô7/02 12 00 0000 21.5 8.8 78 195 8.40 98 0.040 0.050 0.015 0.010
12 00 0015 21.0 8.6 107 0.040 0.060 0.026 0.015
12 00 0040 9.0 1.8 210 7.20 107 0.310 0.040 0.015 0.011
72/09/05 11 55 0000 18.2 96 190 8.40 108 0.050 0.120 0.014 0.011
11 55 0004 18.2 6.7 190 8.45 108 0.040 0.050 0.014 0.008
11 55 0015 17.9 8.0 185 8.40 108 0.050 0.050 0.014 0.007
11 55 0030 16.3 3.1 215 7.30 118 0.030 0.050 0.013 0.009
11 55 0045 11.1 0.4 220 7.20 119 0.030 0.270 0.040 0.031
11 55 0066 9.7 0.0 200 7.50 119 0.070 0.850 0.082 0.020
7?/10/24 14 30 0000 84 220 7.80 99 0.040 0.120 0.019 0.011
14 30 0004 7.8 10.3 212 7.80 99 0.040 0.110 0.032 0.023
14 30 0015 7.7 9.9 220 7.80 99 0.030 0.110 0.036 0.027
14 30 0025 7.7 9.9 210 7.80 105 0.040 0.130 0.037 0.025
16 30 0035 7.7 10.2 210 7.80
14 30 0045 7.7 10.3 212 7.80 105 0.040 0.130 0.041 0.028
14 30 0055 7.7 9.6 220 7.80 105 0.040 0.140 0.037 0.028
14 30 0062 7.7 10.4 220 7.70 106 0.050 0.160 0.047 0.035
32217
DATE TIME DEPTH CHLRPHYL
FROM OF A
TO DAY FEET UG/L
72/07/02 12 00 0000 10.2J
72/09/05 11 55 0000 R.8J
72/10/24 14 30 0000 14.OJ
J VALUE K 4O W TO F t QPQ
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APPENDIX C
TRIBUTARY DATA
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ST jQET ETQIEVAL DATE 74/101)0
2737A1 LS273741
46 25 00.0 094 21 30.0
GULL RIVER
27 Co 011, SHEET 01
0/GULL LAPcF (CASS CO)
CO HWY 105 1 PDG N OF EAST GULL LAKE
1 1EPALES 2111204
4 0000 FEET DEPTH
OOe,30 006?S 00610 00671 00665
DATE TIME DEPTH N02 NO3 TOT KJEL NHI—N PHOS—DIS PHOS—TOT
FROM 0 N-TOTAL N TOTAL ORTHO
TO DAY FEET MG/L 1G/L HG/L MG/L P MG/L P
72/10/15 10 50 0.0 6 0.450 0.044 0.005K 0.019
7?/11/18 1400 0.020 0.c40 0.019 0.005K 0.018
7?/I?/?? 09 40 0.0)5 0.560 0.034 0.005K 0.013
71/01/06 09 15 0.037 0.S 0 0.058 0.005K 0.020
73/O?/04 10 0’) 0.048 0.690 0.039 0.005K 0.010
71/03/?6 14 45 0.072 1.050 0.0 0 0.015 0.020
71/04/09 14 IS 0.025 2.100 0.039 0.005K 0.020
73/04/24 14 25 0.015 0.440 0.008 0.005K 0.020
73/05/04 10 20 ( 1.015 0.480 0.006 0.011 0.020
71/05/20 13 30 0.010K 0.610 0.006 0.007 0e025
73/06/11 10 55 0.010K 0.720 0.010 0.005P 0.020
73/07/13 15 35 0.010K 0.580 0.017 0.005K 0.015
71/08/17 14 10 0.010K 0.330 0.020 0.014 0.020
71/09/17 13 50 0.025 0.670 0.050 0.009 0.025
K VALUE r NOt N TO r3E LESS
THAN INDICATED
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STOPET r ETR1EVAL DATE’ 7 ./19/30
2737 3 1
‘.6 23
LOwER
27
TI GULL
Co HWY
1 IEPALES
4
L52737 U
00.0 094 22 00.0
GULL UK/DADE LAKE CONNECT!
Co Wil, SHEET *1
LAKE (CASS CO)
77 XING SW OF EAST GULL LAKE
2111204
0000 FEET DEPTH
00h3
00675
00610
00671
00665
DATE
TIME
DEPTH
NO?€ !O3
TOT KJEL
NH3—N
PHOS—DIS
PHOS—TOT
FPC)M
(W
N-TOTAL
N
TOTAL
OPT’-40
TO
DA
FEET
MG/L
AG/L
MC /L
Mc /L P
MG/L P
7?/)0/15
10
30
0.6 5
0.056
0.005K
0.014
7 2/Il/l U
13
50
0.011
0.760
0.06?
0.005K
0.011
7?/I2/2?
I I
45
O. ?0
0.043
0.005K
0.01
71/0l/0
10
0()
C.014
0.B40
0.04
0.005K
0.010
71/02/04
13
( 10
0.01
1.100
0.071
0.00 5K
0.010
71/03/?
l’
30
.0 70
1.750
0.078
0.010
0.020
71/04/09
14
00
0.010K
1. 60
0.010
0.00 5K
0.070
73/04/24
11
10
0.010K
0.5 O
0.00 5K
0.005K
0.020
71/05/0’
10
00
0.010K
0.665
0.005K
0.006
0.02SK
71/05/20
10
00
3.0 )0K
0.570
0.011
0.006
0.01 ,
71/06/11
10
35
( 1 . O1OK
0.790
0.009
0.005K
0.015
71/07/13
14
Of)
0.01 0K
0.700
0.014
0.00 5K
0.020
71/0 4/17
14
00
0.013K
0.660
0.030
0.020
0.030
71/09/17
11
00
0.010’(
0.-30
0.029
0.007
0.010
1< VALUI- NOt TO BE LESS
P-1i N I OIC TED
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STOPET PETPIF.VAL DATE 74/10/30
2737C1 LS2737C1
46 30 30.0 094 20 30.0
UPPER GULL LK/GULL LK CONNECTION
27 Co #11, SHEET $1
1/GULL LAKE (CASS CO)
CO HWY 77 BROG AT VLG OF LAKE SHORE
I IEPALES 2111204
4 0000 FEET DEPTH
00630 00625 00610 00671 00665
DATE TIME 1)EPTr4 NO2 ,NO3 TOT KJEL NH3-N Pr-40S—DIS PHOS—TOT
FROM OF N—TOTAL N TOTAL URTHO
TO DAY FEET MG/L - HG/L MG/I MG/L P MG/L P
7?/I0/15 11 10 0.0’+5 0.700 0.060 0.005 k 0.O2f,
7?/Il/ IM 14 30 0.065 0.5 0 0.056 0.006 0.021
7?/I2/ 2 10 00 0.115 0.560 0.048 0.005K 0.016
73/01/06 09 00 0.189 0.7 0 0.057 0.005K 0.020
73/0?/04 14 00 0.252 0.540 0.027 0.005K 0.015
73/O4/0 14 40 0.010< 1.000 0.011 0.008 0.050
71/04/?4 14 00 0.08? 0.660 0.032 0.005K 0.040
71/05/04 10 50 0.010K 0.640 0.005K 0.006 0.030
73/05/20 11 10 0.010K 0.650 0.008 0.007 0.025
73/06/11 11 20 0.010K 1.600 0.084 0.005K 0.020
71/07/13 15 00 0.010K 0.780 0.010 0.00 5K 0.025
71/08/17 14 30 0.010K 0.700 0.018 0.012 0.035
73/09/17 13 75 0.010K 0.7’0 0.024 0.008 0.025
K VALUE KNOWN TO BE LESS
THAN INDICATED
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STOPET I T IEVAL OAT 74/10/30
2737D1 LS2737D1
41 ’ 2 00.0 094 1R 00.0
( ULL LK/ROUND LK CONNECTION
27 CO S’-IEET #2
1/ OLL LAKE (CASS CO)
US i- WY 371 XING
1 1FPALES
£4
2111204
0000 FEET DEPTH
oO 3J
OOf ’!S
Or,610
00671
00665
DATE
TIME
DFPr-4
JO? ,MO3
TOl KJEL
Nr-13N
HOS—D!S
PHOSTOT
p?OM
1W
N—TOTAL
N
TOTAL
OPTHO
TO
DAY
FFET
1C,/L
iG/L
f4 /L
MG/L P
MG/L r
7? /1O/15
ii
00
0.070
O.4’ S
.066
0.005K
0.u1S
77/1I/1
14
15
0.010K
0.46 0
0.01
0.005K
o.eoa
7?/I?/27
10
30
C.OlDrc
0.400
0.001’
0.005K
0.012
73/01/01’
09
30
fl.O1O’
0.440
C..C?0
O.00 K
0.015
73/02/04
13
45
•D. O lcic
0. ’0O
0.017
0.005K
0.005K
73/01/21’
15
00
0.O ljK
1.000
0.046
0.007
0.010
71/0 /0
14
30
0.010 K
1.760
0.009
0.005K
0.010
73/ 4/?4
14
00
o.Oi0c
0.400
0.005K
0.005K
0.015
71/0S/0 ’
10
11’
0.010K
0. ’” 0
0.005K
0.006
0.020
73/0 ,120
10
40
.01OK
0. 40
0.005K
0.006
0.015
71/01’/11
11
07
0.010K
1.100
0.010
0.005K
0.015
73/07/1 )
15
15
0.010K
0.540
0.009
0.005K
0.015
71/OR/17
14
20
0.010K
0.500
0.016
0.00
0.0?0
73/09/li
13
35
0.010K
0.5’O
0.012
0.005K
0.015
K Vf,LUE r’NO NJ TO BE LESS
T- A J INDIC TEI)
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