U.S. ENVIRONMENTAL PROTECTION AGENCY
NATIONAL EUTROPHICATION SURVEY
WORKING PAPER SERIES
PACIFIC NORTHWEST ENVIRONMENTAL RESEARCH LABORATORY
An Associate Laboratory of the
NATIONAL ENVIRONMENTAL RESEARCH CENTER - CORVALLIS, OREGON
and
NATIONAL ENVIRONMENTAL RESEARCH CENTER - LAS VEGAS, NEVADA
A GPO 697.032
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REPORT
ON
CASSLAKE
BELTRAMI AND CASS COUNTIES
MINNESOTA
EPA REGION V
WORKING PAPER No, 92
WITH THE COOPERATION OF THE
MINNESOTA POLLUTION CONTROL AGENCY
AND THE
MINNESOTA NATIONAL GUARD
NOVEMBER, 1971
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1
C ONTEN IS
Page
Foreword ii
List of Minnesota Study Lakes iv, v
Lake and Drainage Area Maps vi , vii
Sections
I. Conclusions 1
II. Lake and Drainage Basin Characteristics 4
III. Lake Water Quality Summary 5
IV. Nutrient Loadings 9
V. Literature Reviewed 14
VI. Appendices 15
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11
FOR EWORD
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
reservol rs.
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 abatementJn 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 [ g106 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 Homme 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 Kandlyohi
Wailmark Chisago
White Bear Washington
Winona Douglas
Wolf Beltrami, Hubbard
Woodcock Kandiyohi
Zumbro Olmstead, Wabasha
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940 40’
1av nia j
Map Location
Q
WOL
L AKi
27A2C
BEMIDJI, WOLF, ANDRUSIA
& CASS LAKES
Tributary Sampling Site
Lake Sampling Site
Sewage Treatment Facility
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Location
CASS
LAKE
Tributary Sampling Site
Lake Sampling Site
Sewage Treatment Facility
Direct Drainage Area Boundary
Mi.
-------
CASS LAKE
STORET NO. 2715
I. CONCLUSIONS
A. Trophic Condition:
Survey data indicate that the main body of Cass Lake is
mesotrophic. Reportedly, the only portion of the lake exhib-
iting nuisance conditions of any kind is Allen’s Bay near the
Lake Andrusia outlet channel (Lang, et al., 1969). Less than
½ acre of the lake was chemically treated for the control of
rooted aquatic vegetation in 1971 (Bonnema and Johnson, 1972).
Of the 60 Minnesota lakes sampled in the fall when essen-
tially all were well-mixed, only 6 exhibited better overall
water quality based on the parameters measured during the
Survey.
B. Rate-Limiting Nutrient:
Because of a loss of phosphorus in the sample, the algal
assay results are not reliable.
Lake data indicate nitrogen limitation in October but
phosphorus limitation in July and September of 1972.
C. Nutrient Controllability:
1. Point sources—-During the sampling year, Cass Lake
received a total phosphorus loading at a rate less than that
proposed by Vollenweider (in press) as dangerous but greater
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2
than the permissible rate; i.e., a mesotrophic rate (see page
13). Of this load, it is estimated that the Bemidji STP con-
tributed almost 34% (see “Report on Wolf Lake”, Working Paper
No. 136), and the Cass Lake STP contributed about 7%.
When the phosphorus removal facilities at Bemidji become
operational, it is calculated that the total phosphorus load
to Cass Lake will be reduced by about 28%. This will reduce
the loading rate from the existing 3.1 lbs/acre/yr (0.35 g/m 2 /
yr) to about 2.3 lbs/acre/yr or 0.26 g/m 2 /yr.
The new loading rate will be less than Vollenweider’s
permissible rate and should result in improvement of the tro-
phic state of Cass Lake.
During the sampling year, it did not appear that the
nutrients from the Cass Lake SIP had a direct effect on
Cass Lake; however, the receiving water--Pike Bay-- was
not sampled. The discharge may be significant in the Bay.
2. Non-point sources (see page 13)--The phosphorus
exports of the Cass Lake drainage were very similar to those
of the drainages of the other lakes in this upper Mississippi
River chain of lakes. The relatively low exports probably
result from the near-headwaters location of the lakes as well
as land-use practices in this largely-forested area of Minne-
sota.
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3
In all, it is estimated that non-point sources contributed
about 60% of the total phosphorus load reaching Cass Lake during
the sampling year.
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4
Mean flow*
421.3 cfs
20.0 cfs
168.6 cfs
17.2 cfs
627.1 cfs
II. LAKE AND DRAINAGE BASIN CHARACTERISTICS
A. Lake Morphometryt:
1. Surface area: 15,596 acres.
2. Mean depth: 25 feet.
3. Maximum depth: 120 feet.
4. Volume: 389,900 acre/feet.
5. Mean hydraulic retention time: 313 days.
B. Tributary and Outlet:
(See Appendix A for flow data)
1. Tributaries -
Name Drainage area*
Mississippi River 732.0 mi
Pike Bay outlet 37.7 mi
Kitchi Lake outlet 302.0 ml
Minor tributaries & 2
immediate drainage - 33.9 ml
Totals 1,105.6 mi 2
2. Outlet -
Mississippi River** 1,130.0 mi 2 627.1 cfs
C. Precipitation***:
1. Year of sampling: 26.7 inches.
2. Mean annual: 23.8 inches.
t DNR lake survey map (no date), not including Pike ; mean depth
by random-dot method.
* 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 mi 2 .
** Outflow adjusted to equal sum of inflows; area includes that of
the lake.
*** See Working Paper No. 1, “Survey Methods”.
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5
III. LAKE WATER QUALITY SUMMARY
Cass lake, one of a chain of upper Mississippi River lakes (see map,
page vi), 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 two or more depths at each station (see map, page vii).
During each visit a single depth-integrated (15 feet or near bottom to
surface) sample was composited from the three stations for phytoplankton
identification and enumeration; and during the last visit, a single five—
gallon depth-integrated sample was composited from the three stations for
algal assays. Also each time, a depth-integrated sample was collected
at each station for chlorophyll a analysis. The maximum depths sampled
were 41 feet at station 1, 15 feet at station 2, and 21 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 was essentially 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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6
A. Physical and chemical characteristics:
FALL VALUES
(10/21/72)
Parameter Minimum Mean Median Maximum
Temperature (Cent.) 5.2 5.9 5.8 6.6
Dissolved oxygen (mg/i) 9.8 10.6 10.8 11.0
Conductivity ( .imhos) 280 287 288 298
pH (units) 8.2 8.3 8.3 8.4
Alkalinity (mg/l) 135 139 140 142
Total P (mg/i) 0.012 0.022 0.023 0.031
Dissolved P (mg/i) 0.006 0.011 0.011 0.016
NO + NO (mg/i) 0.010 0.029 0.025 0.050
Ani onia mg/l) 0.030 0.048 0.045 0.070
ALL VALUES
Secchi disc (inches) 42 74 68 123
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7
B. Biological characteristics:
1. Phytoplankton -
Sampling Dominant Number
Date Genera per ml
07/11/72 1. Dinobryon 593
2. Anabaena 441
3. Cyclotella 116
4. Synedra 87
5. Microcystis 80
Other genera 333
Total 1 ,650
09/07/72 1. Microcystis 2,495
2. Anabaena 452
3. Dinobryon 434
4. Chroococcus 380
5. Flagellates 163
Other genera 922
Total 4,846
10/21/72 1. Fragilaria 2,415
2. Dinobryon 1,849
3. Flagellates 1,358
4. Scenedesmus 1,358
5. Melosira 1,019
Other genera 3,284
Total 11,283
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8
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 ( fig/i )
07/11/72 01 13.4
02 7.0
03 3.2
09/07/72 01 6.6
02 5.0
03 4.6
10/21/72 01 16.4
02 15.9
03 6.4
C. Limiting Nutrient Study:
There was a significant loss of about 54% of the dissolved
phosphorus in the assay sample between the time of collection
and the beginning of the assay. Had this loss not occurred,
the expected control yield would have been about 3 mg/i dry
weight.
The lake data indicate nitrogen limitation in October (N/P
ratio = 7/i) but phosphorus limitation in July (N/P ratio = 19/1)
and in September (N/P ratio = 28/i).
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9
IV. NUTRIENT LOADINGS
(See Appendix C for data)
For the determination of nutrient loadings, from October, 1972,
through September, 1973, the Minnesota National Guard collected monthly
near-surface grab samples from each of the tributary sites indicated on
the map (page vii), except for the high runoff month of April, when two
samples were collected, and the colder months when samples were not
collected at several sites because of ice cover and low flows.
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 tribu-
tary 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 loadings*. Nutrient loadings for unsampled “minor tribu-
taries and immediate drainage” (“ZZ” of U.S.G.S.) were estimated by using
the mean concentrations in the unnamed tributary to Pike Bay at station B-i
and the mean ZZ flow.
The operator of the Village of Cass Lake wastewater treatment plant
did not provide sufficient flow data to permit calculation of nutrient
loads, and nutrient loads from that source were estimated at 2.5 lbs P
and 7.5 lbs N/capita/year. In this report, these loads were assumed to
have reached Cass Lake.
* See Working Paper No. 1.
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10
The Bemidji wastewater treatment plant is an indirect source of nu-
trients to Cass Lake. During the sampling year, Wolf Lake retained 12%
of the total phosphorus and none of the inorganic nitrogen loadt, and
Lake Andrusia retained about 37% of the total phosphorus load estimated
to have been received from the Bemidji SIP and about 12% of the inorganic
nitrogentt. Therefore, in the following tables, the loads attributed to
the indirect point source (Bemidji STP) were estimated on the basis of
retentions in Wolf and Andrusia lakes. The loads attributed to the Cass
Lake inlet at station 2715D-l are those measured minus the indirect
Bemidji STP loads.
A. Waste Sources:
1. Known municipal -
Pop. Mean Receiving
Name Served Treatment Flow (mgd) Water
Cass Lake 1,317* Imhoff 0.132** Pike Bay
Bemidji*** 11,400 trickling 0.942 Mississippi
filter River
2. Known industrial - None
1- See “Report on Wolf Lake”, Working Paper No. 136.
-M See “Report on Lake Andrusia”, Working Paper No. 81.
* 1970 Census.
** Estimated at 100 gal/capita/day.
Indirect.
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11
B. Annual Total Phosphorus Loading - Average Year:
1. Inputs -
lbs P/ % of
Source yr total
a. Tributaries (non—point load) -
Mississippi River 17,800 36.3
Pike Bay outlet 1,050 2.2
Kitchi Lake outlet 7,010 14.3
b. Minor tributaries & immediate
drainage (non-point load) - 950 1.9
c. Known municipal -
Cass Lake 3,290 6.7
Bemidji (indirect) 16,480 33.6
d. Septic tanks — Unknown
e. Known industrial - None -
f. Direct precipitation* - 2,430 5.0
Total 49,010 100.0
2. Outputs -
Lake outlet - Mississippi River 17,900
3. Net annual P accumulation - 31,110 pounds
* See Working Paper No. 1.
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12
C. Annual Total Nitrogen Loading - Average Year:
1 . Inputs —
Source _______ ______
a. Tributaries (non-point load) -
Mississippi River
Pike Bay outlet
Kitchi Lake outlet
b. Minor tributaries & immediate
drainage (non-point load) -
c. Known municipal -
Cass Lake
Bemidji (indirect)
d. Septic tanks - Unknown
e. Known industrial - None
f. Direct precipitation* - _________ 12.3
Total 100.0
2. Outputs -
Lake outlet - Mississippi River 994,010
3. Net annual N accumulation - 223,940 pounds
lbs N I
yr
611,010
47,170
270,320
% of
total
50.2
3.9
22.2
36,910 3.0
9,880
92,410
0.8
7.6
150,250
1,217,950
* See Working Paper No. 1.
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13
0. Mean Annual Non-point Nutrient Export by Subdrainage Area:
Tributary lbs P/mi 2 /yr lbs N/mi 2 /yr
Mississippi River 24 835
Pike Bay outlet 28 1,251
Kitchi Lake outlet 23 895
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 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/acre/yr 3.1 2.0 78.1 14.4
grams/m 2 /yr 0.35 0.22 8.8 1.6
Vollenweider loading rates for phosphorus
(g/m 2 /yr) based on mean depth and mean
hydraulic retention time of Cass Lake:
“Dangerous” (eutrophic rate) 0.58
“Permissible” (oligotrophic rate) 0.29
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14
V. LITERATURE REVIEWED
Anonymous, 1973. Wastewater disposal facilities inventory. MPCA,
Minneapolis.
Bonnema, Kenneth, and William G. Johnson, 1972. Control of aquatic
vegetation, algae, leeches and swimmer’s itch in 1971. Dept.
Nat. Resources, St. Paul.
Lang, D. E., J. F. McGuire, and K. M. Bishop; 1969. Report on
investigation of water quality of Wolf, Andrusia and Cass lakes.
MPCA, Minneapolis.
Schilling, Joel, 1974. Personal communication (lake map; treatment
requirements at Bemidji). MPCA, Minneapolis.
Vollenweider, Richard A., (in press). Input-output models. Schweiz.
A. Hydrol.
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15
VII. APPENDICES
APPENDIX A
TRIBUTARY FLOW DATA
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T 714-4’jTA’4Y VLO.J INFOQMATION FOP MINNESOTA
10/30/74
LA F corw 71S
r( 5 LAKi-
TOTAL )‘ ATtjAC, j E A OF LAKF 11 10.00
NOTF ** TPI’i 1 -”)1=CuC1
MEMJ P4ONTHLY FLOWS AND DAILY FLOWS
TQ1NLJIA Y ‘OMTH YE
‘lEAN FLOW ‘)AY FLOW DA’
FLOW DAY FLOW
?71 5A 1
1110.00
3?1.3
2715Cl
37.73
5•74
271501
717.00
61.03
?71 5F 1
107.00
9.10
271577
54.70
7 3
6.14
204.00
S’ .2O
1 .55
330 • 30
7 • 95
2L.6. 00
70.90
4 • 79
1323.20
40.40
837.00
160.(,0
46 • 40
1595. 0
5560
1054.00
474.00
47 •MQ
SIJ 0Pft1”A’,F
NOPMALIZEO
FLOWS
TP1NJTA Y AP’-A
JAN
F -
N4-
AP4
M4
JUN
JUL
AUG
TOT L 0 ?A1NAC,L A E4 OF LA cE
UA OF SUf —flWA1JAGE AP AS
=
=
1130.00
1125.90
TOTAL
TOTAL
FLOW
FLOW
IN
OUT
7513.87
7507.99
1174.50
43.60
78’i.O0
351.00
51.40
628.60
21 • 9C
417.00
16 L00
19.80
SEP OCT NOV DEC MEAN
374.20
11.20
240.00
85.20
6.03
438.10
18.80
313.00
105.00
12.90
S OHM A P Y
452.00
14.60
295.00
132.00
7.55
284 • 40
7.60
181 .00
77.00
3.75
300.40
8.16
212.00
68.00
3.56
626.50
20.01
421 .25
168.58
17.25
?7 1 5A1
10
7?
415.00
14
54 .00
11
77
35 .”3
5
3-2.0O
1’
72
453. 0
10
419.00
1
71
365. fl
?Ci
31 .00
7
71
306.0)
IN
106.00
3
73
O07. ’O
17
2730.00
4
73
lN1. 0
1
?O?.0)
5
73
207.0’)
1’
I 9.O3
)
73
? ‘ l0.()
7
74
300.00
?57.OO
9
71
I3’. O
I I
13 1.00
9
73
660.iO
16
SJ’ .O0
?71 5C1
}fl
II
1?
I
2
1
4
5
6
7
9
9
7)
7
72
73
71
71
71
73
7
77
71
7’
13.40
17. JO
‘ .31
4.43
71.60
1 .5)
15.03
12.60
10•’ O
9.73
I5. i0
1’
S
10
?(i
IN
17
1
19
Il
lb
Ib.0O
#.40
12.00
.90
4.40
f ’..Ou
16.00
16.00
.90
‘4.70
17.00
14 176.00
14 14.00
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TW1BUTA Y FLOW INF0 MAT1ON FOF MINNESOTA
10/30/74
LAKE CODE ?7I5 CASS LAKE
MEAN MONTHLY FLOWS AND 1)AJLY FLOWS
TP1 UTA Y MONTH YE A iEA FL1 W DAY FLOW DAY FLOW OAY FLOW
271501 10 7? 270.00 14 156.00
11 77 ??3.00 5 223.00
12 72 319.00 10 309.00
I 7 1 ?07.’)O 20 250.00
7 73 210.00 10 218.00
3 73 67?.DO 17 2020.00
4 73 ?70.O0 1 286.00 14 248.00
73 264.30 19 240.00
6 73 230.00
7 73 ?05.Ofl 0 1 2.00
73 ?0O.&0 11 p00.00
9 73 300.00 16 348.00
2715 1 10 77 1?1.0O 14 160.00
11 72 95.60 5 95.00
12 7 ’ 1O?.00 10 99.00
71 76.00 20 66.00
73 61.10 18 63.00
3 73 194.00 17 584.00
4 73 123.c)O 1 130.00 14 113.00
5 73 120.00 19 109.00
6 73 90.00
7 73 00.00 0 71.00
0 73 70.60 11 70.00
9 73 10.00 16 139.00
271577 10 7 6.9? 14 9.10
11 7? 4.63 5 4.60
17 7 5.16 10 5.20
1 73 2.62 20 2.30
2 73 1.f 6 10 1.70
1 73 1 .10 17 39.00
4 73 22.30 1 24.00 14 21.00
S 73 21.70 19 20.00
6 73 10.00
7 73 14.00 8 13.00
0 73 13.00 11 13.00
9 73 27.00 16 25.00
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APPENDIX B
PHYSICAL and CHEMICAL DATA
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STOPEI QFTPTLVAL rJ8TE 74/II /3J
27l 0l
47 24 45.0 094 37 40.0
CASS LAKE
27 MINNESOTA
I IEPALES
1•
21) 1202
0044 FEET DEPTH
00100 00077
DO TI 4 A ’.JSP
SECCH I
MG/I INCHES
00094
C’lr)uCT 99
FIELD
MICROMMO
00630
NO2&N03
N-TOTAL
MG/L
00610
NH3-N
TOTAL
MG /L
u 00 I 7’
DATE TIME DEPTH wATER
FPOu r r T HP
TO 1)49 FEFT CENT
00400 00410
T ALK
C ACO 3
SU HG/I
00665 00666
PHOS—TOT PHOS-DIS
MG/L P MG/I P
72/07/Il
19 30
0000
‘2
18 30
0004
23.0
10.1
280
8.40
138
0.060
0.070
0.020
0.000
18 30
0015
0.H
5•6
290
.?0
150
0.070
0.080
0.016
0.009
IS 10
0020
8.4
‘.4
300
7.70
156
0.050
0.070
0.018
0.013
IS 19
001°
12.4
0.2
330
7.30
172
0.050
0.230
0.024
0.015
18 30
0041
8.1
0.
340
7.20
175
0.080
0.580
0.120
0.025
72/09/07
15 00
0000
68
248
8.25
133
0.050
0.150
0.026
0.010
IS 00
0001.
I7.
5.9
248
8.25
132
0.040
0.150
0.026
0.010
IS 00
0010
I7.M
7.4
?48
8.25
136
0.060
0.150
0.020
0.009
IS 00
0015
17.7
‘.4
250
8.25
136
0.060
0.150
0.020
0.008
15 00
0020
17.7
N. H
248
8.2S
137
0.060
0.150
0.023
0.009
IS 00
00’S
17.7
5.3
250
8.29
140
0.060
0.160
0.020
0.009
IS flO
0030
17.1
4.1
250
M.2 0
140
0.050
0.200
0.024
0.010
IS 00
0015
13.7
0.1
29 5
7.40
169
0.050
0.880
0.083
0.029
IS 00
0060
10.1
0.0’.
110
7.35
173
0.090
1.290
0.160
0.025
77/10/21
II 00
000°
59
298
8.40
136
0.020
0.030
0.025
0.010
II 00
0004
5. . ’
0.9
280
8.40
135
0.020
0.030
0.031
0.016
II 00
0015
5.8
9.8
280
8.40
136
0.020
0.040
0.027
0.015
II 00
0070
5. 5
10.9
280
8.40
139
0.020
0.040
0.025
0.012
Il 00
0025
5• H
10..’
280
8.40
140
0.030
0.040
0.023
0.OU
11 00
001’)
5.4
13.1’
290
8.40
141
0.050
0.060
0.027
0.01*
II 00
0015
c. ’
11.0
290
8.30
140
0.020
0.060
0.023
0.015
II 00
0040
5.
10.9
290
8.30
140
0.020
0.060
0.020
0.013
OATF
uHF
GEPI) -)
3’? Ii
CHLPL H L
FPQ 4
or
A
TO
049
FErT
UG/L
7 7/07/Il
IS 10
0000
13.1.1
7 ?’0Q/07
IS 00
0000
4.61
72/10/21
II 09
000°
16.4.1
J V. LUE KNOW,) TO HE jN E°qO ’
-------
STORET RETRIEVAL DATE 74/1(,/30
271502
47 23 30.0 094 35 06.0
CASS LAKE
27 MINNESOTA
11EPALES 2111202
4 0019 FEET DEPTH
00010 O(Y 0O 00077 00094 00400 00410 00630 00610 00665 00666
DATE TIMF 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 FEFT CENT MG/L INCHES MICROMHO SU MG/1 MG/L MG/I MG/I P MG/I P
7 2/07/lI 19 15 0000
19 15 0004 21.7 1 ).6 290 8.30 140 0.060 0.080 0.012 0.005
72/09/07 10 20 0000 87 250 8.30 143 0.070 0.140 0.016 0.008
10 20 0004 17.4 7.6 250 8.30 138 0.060 0.120 0.016 0.008
10 20 0015 16.9 7.? 250 8.30 141 0.060 0.120 0.014 0.008
7?/10/21 09 45 0000 48 298 8.20 140 0.040 0.060 0.020 0.009
09 45 0004 5.2 11.0 290 8.20 140 0.050 0.070 0.019 0.014
32217
DATE uHF DF°TH CHLRPMYL
FROM OF A
TO PAY FEET UG/L
72/07/11 19 15 0000 7. .)J
72/09/07 10 0 0000 $.OJ
72/10/?1 09 45 0000 15.)J
J VALUE KNOWN TO 3E IN €PPOI<
-------
STOPET RETPTEVAt DATE 74/10/30
271503
‘.7 26 50.0 094 31 00.0
CASS LAKE
27 MINNESOTA
1 1EPALES 2111202
4 0022 FEET DEPTH
00010 3C P0 00077 00094 00400 00410 00630 00610 00665 00666
DATE TIME DEPTH WATEP DO TPANSP CNDIJCTVY PH T ALK N02&N03 NIH3—N PHOS—TOT PPIOS—DIS
FROM OF TEMP SECCHI FIELD CACO3 N—TOTAL TOTAL
TO DAY FEET CENT ‘iG,’L INCHES MICROMHO SU M(,/L MG/L MG/L MG/L P MG/L P
72/07/11 19 30 0000 7?
19 30 0004 73•9 P . - ’ 290 8.20 144 0.040 0.050 0.010 0.006
19 30 0015 ?0.’ 9.2 300 8.20 143 0.040 0.050 0.011 0.005
19 30 0071 19.4 P.4 30 8.10 146 0.040 0.050 0.010 0.006
72/09/07 09 45 0000 123 258 8.50 142 0.060 0.090 0.013 0.007
09 45 0004 17.8 7.4 258 8.50 141 0.060 0.080 0.011 0.006
09 45 0015 17.4 .3 260 8.45 139 0.060 0.080 0.011 0.006
09 45 0014 17.3 8.3 260 8.50 140 0.060 0.080 0.011 0.007
72/10/21 10 75 0000 10? 285 8.30 138 0.010 0.050 0.014 0.006
10 75 0004 6.6 10.9 280 8.30 140 0.030 0.040 0.012 0.007
10 25 0015 6. 10. 280 8.30 142 0.040 0.050 0.016 0.009
10 25 0018 6. 10.4 290 8.20 140 0.030 0.040 0.017 0.009
J?21 7
DATE TI W DFPTM CHLRPNYL
FROM OF
TO DAY F T U’ /L
72/07/11 19 30 0000 3 .2J
72/09/07 09 ‘ .5 0000 4.6J
72/10/21 10 25 0000 6.4
J VALUE KNOWN TO PE IN EPROP
-------
APPENDIX C
TRIBUTARY and WASTEWATER
TREATMENT PLANT DATA
-------
STORET RETRIEVAL r)ATE 74/10/JO
K VALUE KNOWN TO BE LESS
THAN INDICATED
?71541 LS2715A1
47 27 00.0 094 28 30.0
MISSISSIPPI RIVER
27 Co 4v SHEET #1
0/CASS LAKE
CO HWY 39 B DG .5 MI DOWNSTREAM OF LAKE
11EPALES 2111204
0000 FEET DEPTH
00630
006 ’ S
00610
00671
00665
DATE
TIME
DEPTrI
‘JO NO3
TOT KJEL
NrI3N
PHOSDIS
PHOSTOT
FROM
OF
N—TOTAL
N
TOTAL
OPTt-iO
TO
DAY
FEET
MG/L
lG/L
M(/L
MCi/L P
MG/L P
72/10/14
11
30
0.040
0.550
0.063
0.005K
0.01 .
72/11/0 5
1?
77
O.010c
0.L+00
(1.0?0
0.005K
0.016
71/01/20
11
40
O.0?()
0.440
0.044
0.015
73/07/1
14
00
0.015
0.S ’ O
0.065
0.013
0.013
71/01/17
10
47
0.07?
0. 10
0.028
0.00 5K
0.010
73/04/01
15
30
0.040
1.260
0.019
0.005K
0.015
71/04/14
10
45
O.0 4
0.460
0.007
0.005K
0.015
7l/O5/1
11
40
0.010r
0.4R0
0.00 K
0.005K
0.015
71/06/03
11
40
0.010K
1.050
0.010
0.005K
0.020
73/07/08
1?
05
0.010K
2.400
0.015
0.00 5K
0.010
73/0 /l1
10
35
0.210
0.570
0.014
0.030
71/09/1
11
15
0.010K
0.750
0.020
0.005K
0.015
-------
ST9RET PETRIEVAI DATE 74/11/30
2715A2 LS2715A2
47 30 00.0 094 4 00.0
MTSSISSIPPI RIVEI
27 7.5 BEMIDJI EAST
TICASS LAKF
Lr DTY RD RDG 1.5 MI E OF MEMIDJI LAr E
11EP LES 2111204
4 0000 FEET DEPTH
00 10 00e 71 00665
r)ATE TTMF DE°T’-l JO NO3 TOT KJFL NH3-N PHOS—DIS PHOS—TOT
FPQM OF N—TOTAL TUT L OPTHO
TI) UAY FEET MC,/L 1(,/L M(;,L iG/L P MG/L P
7?/11/0 10 45 !.070 0.660 0.13 0.110 0.130
7?/12/10 10 30 O.0t5 4 0.°00 0.?30 0.092 0.110
71/01/20 09 50 0.9 0 0.189 0.099 0.110
71/01/170902 .09 0.-6U 0.039 0.014 0.025
71/04/01 1150 ‘).027 0. 80 0.007 0.005 K 0.020
71/04/14 09 15 3.O10 1. 4() 0.04P 0.066 0.155
73/04/1 12 55 0.7’-e O 7.600 0.074 0.005K 0.015
71/05/1Q 09 ( 5 0.01i K 1.10’) 0.058 0.130
71/06/03 09 55 C .014 2.?f” ) 0.054 0.13? 0.2 0
71/07/08 09 55 0.017 0.Y’ O 0.OSP 0.062 0.115
71/08/110810 0.210 0.680 0.090 0.110 0.130
73/0 f1’ OQ 45 0.050 0.640 0.044 0.028 0.050
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
STOPET PETPIFVAL DATE 74/10/ 40
2715A3 L52715A3
‘+7 29 00.0 09’. 43 30.0
MISSJSSIP I RIVER
27 Co # ‘ .. SHEET 1
T/CASS LAKE
Co HWY 12 RRDC’ HELO I4EMIDJI SIP
1 IFPALES 2111204
4 0000 FEET DEPTH
O i630 00625 00610 00671 00665
DATE TP E DEPTH NO2 NO3 TOT KJEL NH3N r1OS1)IS PHOS—TOT
FPOM N—TOTAL TOTAL URTHO
TO DAY FEET MG/L i1,/L MG/L M(/L P MG/L P
72/10/14 j7 00 0.017 0.575 0.044 0.044 0.080
72/11/05 10 5 0.017 0.540 0.025 0.061 0.105
72/12/10 10 45 0.0 ’ 0.690 0.154 0.088 0.115
71/01/20 10 10 C.0- 0.630 0.170 0.0 2 0.100
71/02/1 ’4 1? 10 0.140 0.78t) 0.190 0.110 0.130
73/01/17 09 15 O.12 - ?.? Ofl 0.198 0.072 0.095
71/04/01 14 00 0.042 0.600 0.005K 0.006 0.047
73/04/14 0’.) 75 0.010K 0. R0 0.005K 0.007 0.055
73/05/19 10 05 0.010K 0.560 0.005K 0.021 0.050
71/06/03 10 00 0.010K 0.720 0.017 0.038 0.07-,
71/07/08 10 05 0.01 0K 0.580 0.007 0.034 0.075
73/OR/ Il 08 40 0.010 K 0.630 0.023 0.056 0.085
73/09/16 0 55 0.050 0. 2U 0.115 0.044 0.070
K VALUE KNOWN TO HE LESS
THAN INDICATED
-------
STOPET PETFUEVAL ‘)AIF 7 4/10/JO
271581 LS27 1 581
47 22 30.0 094 36 30.0
UNNAMED TRIB TO PIKE BAY
27 Co p11 . SHEET 4
T/CASS LA cF
Co HWY 146 8ROG ABOVE CASS LAKE SIP
1 IEPALES 2111204
4 0000 FEET DEPTH
09 1 )3 006?5 00610 00671 00665
DATE TIME DEPT’-4 NO7kNO3 TOT KJEL NH3—N PHOS—DIS PHOS—TOT
FROM OF N—TOTAL N TOTAL ORTHO
TO DAY FEET MG/L Mc /L M&/L MG/L P MG/L P
7?/I0/ 14 0.700 0.’7 5 0.075 0.009 0.027
7?/lI/0 1? 00 0.850 0.270 0.044 0.008 0.016
73101/20 11 70 0.870 0.370 0.160 0.015 0.020
73/03/17 10 15 0.740 0.720 0.189 0.015 0.035
73/04/01 15 00 0.1)00 0. 80 0.023 0.005K 0.005K
73/04/14 10 ?5 0.740 0.33C 0.015 0.006 0.020
73/05/IQ 11 14 0.280 0.480 0.021 0.012 0.065
73/06/03 11 15 i’.3CYJ 0. ’0 0.044 0.014 0.040
73/07/OR Ii 45 0.1M9 0.580 0.ORR 0.006 0.030
73/OR/il 09 10 0.”80 0. 4O 0.054 0.017 0.030
73/09/16 10 45 0.600 0.400 0.056 0.010 0.020
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
STOPET PETPIEVAL DATE 7 ”’1 /30
2715C1 LS271 SC 1
47 ?3 00.0 094 35 30.0
CASS LK/PIKE B Y NARROWS
27 Co 411. SHEET 4
T/CASS LAKE
US ? R DG ELO CASS LAKE SIP
1 IEPALES 2111204
4 0000 FEET DEPTH
uO6?5 00610 00671 00665
DATE TIME OEPTrI ‘ 1O7 O3 TOT KJEL N,13N HOS—DIS PHOSTOT
FROM OF ‘1—TOTAL N TOTAL OPTrIO
TO DAY FEET MG/L 4(/L MG/C MC./L
7?/I0/14 1? 30 0.500 0.052 0.005K 0.036
7?/H/O5 17 ( ‘7 0.015 0.’+60 0.039 0.005K 0.025
71/03/17 10 25 0.560 0.069 0.007 0.017
71/04/01 15 10 0.01e 1 .l0C. fl.O3 0.005K 0.020
71/04/1” 10 30 0.013K 1 .’OO 0.005K 0.005K 0.025
7 /35/1 11 25 0.010K 0.540 0.005K 0.005K 0.030
73/06/01 11 70 U.010 c 0.7’O 0.016 0.006 0.035
73/07/0’4 ii 0.010K l. ’0C 0.021 0.00 5K 0.015
73/OR/Il 10 15 0. 60 0.015 0.007 0.025
73/09/16 1.1 00 0.02? 0.630 0.015 0.005K 0.015
K VALUE KNOWN TO E LESS
THAN INDICATED
-------
ST )RET PETPIEVAL DATF 74/l’)/30
27 15E1
47 29 00.0 094
KITCHI LK/CASS
27 Co 44,
T/C4SS LAKE
CO HwY 12 8RDG
1 1EPALFS
4
LS?715E1
31 30.0
L CONNECTION
SHEET 41
2 MI w OF PENNINC’TON
2111204
0000 FEET DEPTH
K VALUE KNOWN TO BE LESS
THAN INDICATED
O0’,30
00625
O Oe10
00671
00665
r)ATE
T1r*:
DE’ TH
‘JO? .NO1
TOT KJ L
NH3—N
PrIOSI)IS
‘HOS—TOT
FROM
OF
N—TOTAL
N
TOTAL
OPTHO
TO
fAY
FEET
MG/L
MG/L
MG/I
Mc,/L P
MG/L P
72/1 )114
ti.0??
0.P’5
0.042
0.005K
0.033
72/11/05
1?
16
0.019
3. ’70
0.04?
0.007
0.025
72/12/10
12
70
(1.021
0.720
0.044
0.006
0.018
71/01/20
ii
.5
0.099
0.710
0.037
0.010
0.015
73/0?/19
14
70
O.16P
0.690
O.02P
0.011
0.015
73/01/17
10
55
0.200
0.800
(1.026
0.005K
0.015
73/04/01
15
40
0.147
0.750
0.008
0.005K
0.015
71/04/14
10
56
0.0)8
0.7R0
0.014
0.005k
0.025
71/05/19
11
55
(1.010K
1.10
0.046
0.046
0.085
73/06/03
11
S5
o.oioc
0.720
0.025
0.006
o.02s
73/07/08
12
15
0.010K
0.840
0.009
0.005K
O.0 5
73/O /11
10
40
( 1.05
0.840
0.046
0.007
0.030
73/09/l
11
30
0.010K
0.R?0
0.021
0.007
0.035
-------
STOPET RETRTEVAL DATE 74/10/30
271551
47 22 30.0 094
CASS LAKE
27 Co 11
T/CASS LAKE
CASS LAKE/PIKE
I 1EPALES
4
1P271551
35 30.0
SHEET #4
BAY NARROWS
2141204
0000 FEET
P00 1317
DEPTH
00630
006?S
00610
00671
00666
50051
50053
r)ATE
TrMF
r)E2TH
NO2F..N03
TOT KJEL
NH3—N
PHOS—DIS
PHOS-TOT
FLOW
CONDUIT
FROM
OF
N—TOTAL
N
TOTAL
OPTHO
PATE
FLOw—MGD
TO
DAY
FEET
MG/L
MG/L
MC,/L
MG/L P
MG/L P
INST MGD
MONTHLY
71/01/17
13
00
0.810
33.500
11.800
4.600
7.200
1.000
71/02/07
0.115
41.000
20.000
8.800
13.500
73/03/07
0.165
35.700
15.800
7.300
10.500
71/04/04
0.020
47.000
4.000
9.900
13.000
71/05/22
0.070
47.000
15.600
22.000
73/06/26
0.130
39.600
23.?00
10.800
11.500
71/OR/29
10
00
43.100
20.300
10.200
15.000
0.024
0.025
73/IO/OQ
09
00
0.070
27.000
24.000
7.600
9.900
0.024
71/10/16
13
30
u.040
40.000
30.000
10.400
14.000
0.024
71/11/14
11
00
0.110
37.600
17.000
6.150
9.600
0.024
73/12/12
10
00
0.180
40.000
23.000
8.500
12.000
74/01/21
10
00
0.760
46.000
22.000
9.900
13.000
-------
STOPET ETR1F V ‘)4T 74/11/14
?7C OCI 271501
47 26 30.0 094 38 30.0
LK ANOPUSIA/CASS LAKE CONNECTION
27 Co #4. ShEET 1
0/LAKE AND1 USIA
Co HWY 33 HPDG 3.5 MI NW OF CASS LAKE
1 IFPALES 2111?04
4 0000 FEET DEPTH
00630 0062 5 00610 00671 00665
DAT TTM flE T-I U02&N03 TOT KJEL NH3-N PHOS—r)IS PHOS-TOT
FROM OF N—TOTAL N roTAL OPTHO
TO 1)Ay FEET MG/L iC/L M /L M( ,/L P MG/L P
7?/I0/14 1? 30 C.110 1.050 0. ORA 0.010 0.069
7?/1I/0 11 10 0.045 3.7?0 0.052 3.024 0.031
7?/l’/lO 11 11 u.0” 0.630 0.054 0. O1H 0.033
73/01/20 10 40 0.065 0. 10 0.1?6 0.039 0.050
73/0?/LH 12 0 0.091 0.670 0.115 0.042 0.065
71/flh/1 0 17 0.176 0.630 0.074 0.034 0.055
73/04/01 14 15 0.120 0.690 0.016 0.008 0.055
71/04/14 O 45 u.014 ‘.000 0.058 0.007 0.050
73/05/19 10 30 0.0l0 c 0.600. 0.005K 0 .005K 0.035
71/06/03 10 pc 0.019K 0.580 0.009 0.005K 0.030
71/07/0 tO 0 0.0 10K 0.940 9.012 0.007 0.030
71/O /JI 09 If) .01OK 1.CF 0 0.019 0.00 0.050
71/0 /l6 1015 ).313” 1.100 0.024 0.014 0.070
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
STORFT PFTIJTEVAL 1)ATE F4/1I/ 14
?7A251 TF27A25 1
P011690
47 29 30.0 096 50 00.0
bE 1 I L)J I
27 Co d4 SHEET #1
T/ OLF LAKE
MISSISSIPPI RIVEI
IIEPALES 2141204
4 0000 FEET
DEPTH
00(-31)
00625
0u610
00671
0066 5 50051 50053
DATE
TI’ W
DE T-4
, 1)? iO3
TOT KJEL
NH3-N
PHO5-DIS
PHOS—TOT FLOW CONDUIT
F OM
O
i—TOTAL
N
TOTAL
OPTIlO
RATE FLOW—MGD
TO
DAY
FFET
MG/L
MG/I
MG/I
MG/L P
MG/L P INST MGD MONTHLY
71/01/29
11 60
CP(T)—
1.250
39.900
22.000
5.400
8.400 0.785 0.984
71/01/20
Ii 00
71/02/?’3
10 30
C”(T)—
1.260
41.000
?4.000
8.200
9.000 1.000 0.900
71/)?/?
12 30
71/03/30
10 30
CPU)—
?.300
26.000
11.600
9.200
9.600 0.900 0.866
71/03/36
13 00
73/04/30
11 00
CP(T)—
7.100
30.000
13.200
6.200
10.300 1.000 0.846
73/04/10
Ii 00
73/05/31
11 00
CP(T)—
?.M?0
47.C00
2S.100
R.R90
11.500 1.350 1.000
71/05/31
13 00
71/06/2’
II 00
CP(T) -
‘.200
31.000
16.400
6.600
9.900 1.200 1.200
71/06/29
13 00
73/07/31
11 00
CP(T)—
2.800
26.000
7.000
3.300
9.680 1.000 1.000
71/07/31
13 00
71/04/04
10 30
CPU)—
2.030
? . ‘O0
.100
1.200 1.000
73/OM/04
17 30
73/10/01
II 00
CPU)—
1.050
31.500
20.000
1.000
0.500 0.925 0.900
71/10/0)
13 00
71/10/3)
)? 00
CPU)—
0.540
40.000
14.000
6.000
12.000 0.950 0.900
73/10/31
)4 00
73/11/30
II GO
CP(T)—
0.063
49.000
28.000
4.900
11.000 0.870 0.790
71/11/10
13 00
74/01/0?
I I 00
CPU)—
2.000
31.500
21.000
10.600
11.500 0.900 0.977
74/01/0.’
Il 00
-------
STO T PETpJFV L OATE 74/11/14
?74251 tF27A251 PO1I4’ 0
47 29 30.0 094 50 00.0
hEM ID J I
27 Co 44 SHEET #1
T/WOLF LAKt-
MISSISSIPPI RIVER
11E’ ALES 2141204
4 0000 FEET DEPTH
3 3O 0O6 5 00610 00671 00665 50051 50053
naru TJMF DEPT-I NO?F NO1 TOT KJFL NH3—N PHOS—DIS PHOS—TOT FLOW CONDUIT
FROM OF \j-TOTAL N TOTAL ORTHO RATE FLO W—MGD
TO ) Y FFET “l(,/L ‘l&/L M’3/L MG/L P M&/L INST MGD MONTHLY
7’ /O?/04 10 00
17.600 17.600 ‘ .600 12.500 0.950 0.932
74/0?/04 12 00
------- |