U.S. ENVIRONMENTAL PROTECTION AGENCY
NATIONAL EUTROPHICATION SURVEY
WORKING PAPER SERIES
REPORT
ON
LAKE fllNNEWASKA
POPE COUNTY
MINNESOTA
EPA REGION V
WORKING PAPER No, U4
PACIFIC NORTHWEST ENVIRONMENTAL RESEARCH LABORATORY
An Associate Laboratory of the
NATIONAL ENVIRONMENTAL RESEARCH CENTER - CORVALLIS, OREGON
and
NATIONAL ENVIRONMENTAL RESEARCH CENTER - LAS VEGAS, NEVADA
•foOPO 697.O32
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REPORT
ON
LAKE niNNEWASKA
POPE COUNTY
MINNESOTA
EPA REGION V
WORKING PAPER No,
WITH THE COOPERATION OF THE
MINNESOTA POLLUTION CONTROL AGENCY
AND THE
MINNESOTA NATIONAL GUARD
DECEMBER, 1974
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1
CONTENTS
Page
Foreword ii
List of Minnesota Study Lakes iv, v
Lake and Drainage Area Map vi
Sections
I. Conclusions 1
II. Lake and Drainage Basin Characteristics 3
III. Lake Water Quality Sumniary 4
IV. Nutrient Loadings 8
V. Literature Reviewed 13
VI. Appendices 14
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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.
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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
Mi nnetonka Hennepi n
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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H
‘p
4
Minnesota
Map Locatf on
LAKE MINNEWASKA
Direct Drainage Area Boundary
? Sewage Treataient Facility
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LAKE MINNEWASKA
STORET NO. 2761
I. CONCLUSIONS
A. Trophic Condition:
Survey data show that Lake Minnewaska is eutrophic. Of the
60 Minnesota lakes sampled in the fall of 1972, when essentially
all were well—mixed, 22 had less mean total phosphorus, 21 had
less mean dissolved phosphorus, and 17 had less mean inorganic
nitrogen. Of the 80 Minnesota lakes sampled, 15 had less mean
chlorophyll a, and 27 had greater mean Secchi disc transparency.
Survey limnologists noted an algal bloom in progress in
September.
B. Rate-Limiting Nutrient:
There was a significant loss of nutrients in the assay sample
between the time of collection and the beginning of the assay, and
the results are not indicative of lake conditions at the time of
sampling. However, based on the level of nutrients observed at
the time the sample was collected, the potential primary produc-
tivity would have been moderate.
The lake data indicate nitrogen limitation during July and
October and phosphorus limitation in September.
C. Nutrient Controllability:
1. Point sources--During the sampling year, Lake Minnewaska
received a total phosphorus load at a rate slightly above the rate
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2
proposed by Vollenweider (in press) as dangerous; i.e., a eu-
trophic rate (see page 12). It is estimated that the City of
Glenwood contributed about 69% of the total load.
Removal of 80% of the phosphorus at Glenwood would reduce
the loading rate to 0.07 g/m 2 /yr (an oligotrophic rate) and
should improve the trophic condition of the lake.
2. Non-point sources--With a very small drainage area to
lake area ratio (85/1), areal nutrient input was small compared
to point-source loads; the mean annual phosphorus load from
non-point sources amounted to 26.5% of the total load reaching
the lake.
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II. LAKE AND DRAINAGE BASIN CHARACTERISTICS
A. Lake Morphometry :
1. Surface area: 7,110 acres.
2. Mean depth: 19.6 feet.
3. Maximum depth: 32 feet.
4. Volume: 139,356 acre/feet.
5. Mean hydraulic retention time: 12.7 years.
B. Tributary and Outlet:
(See Appendix A for flow data)
1. Tributaries -
Name Drainage area* Mean flow*
(
Unnamed Ditch (B-l) 2.6 mi2 0.5 cfs
Pelican Lake outlet 46.2 mi2 8.1 cfs
Minor tributaries & ~
immediate drainage - 28.0 mi 6.5 cfs
Totals 76.8 mi2 15.1 cfs
2. Outlet -
Outlet Creek 88.0 mi2** 15.1 cfs
C. Precipitation***:
1. Year of sampling: 22.4 inches.
2. Mean annual: 22.7 inches.
t DNR lake survey map (1963); 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 .
** Includes area of lake.
*** See Working Paper No. 1, "Survey Methods".
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4
III. LAKE WATER QUALITY SUMMARY
Lake Minnewaska 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 three 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 from each of the stations for chlorophyll a analysis.
The maximum depths sampled were 18 feet at station 1, 24 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 essentially was well-mixed,
are sumarized 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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5
A. Physical and chemical characteristics:
FALL VALUES
(10/25/72)
Parameter Minimum Mean Median Maximum
Temperature (Cent.) 5.9 6.2 6.2 6.3
Dissolved oxygen (mg/i) 10.0 10.6 10.8 11.2
Conductivity ( imhos) 650 666 650 750
pH (units) 8.6 8.6 8.6 8.7
Alkalinity (mg/i) 180 211 210 240
Total P (mg/i) 0.030 0.040 0.038 0.048
Dissolved P (mg/i) 0.014 0.021 0.020 0.032
NO + NO (mg/i) 0.050 0.061 0.060 0.070
Am onia mg/1) 0.060 0.069 0.070 0.080
ALL VALUES
Secchi disc (inches) 38 67 68 98
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6
B. Biological characteristics:
1. Phytoplanktori -
Sampling Dominant Number
Date Genera per ml
07/06/72 1. Dinobryon 1,031
2. Microcystis 940
3. Fragilaria 850
4. Anabaena 796
5. Melosira 380
Other genera 687
Total 4,684
09/01/72 1. Microcystis 5,797
2. Merismopedia 616
3. Aphanocapsa 543
4. Dinobryon 290
5. Anabaena 181
Other genera 1,015
Total 8,442
10/25/72 1. Fragilaria 3,268
2. Asterionella 1,205
3. Dinobryon 602
4. Microcystis 331
5. Gomphosphaeria 226
Other genera 512
Total 6,144
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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 ( ig/l )
07/06/72 01 10.9
02 9.5
03 9.3
09/09/72 01 9.3
02 8.8
03 8.4
10/25/72 01 4.6
02 3.4
03 4.4
C. Limiting Nutrient Study:
There was a significant loss of nutrients in the assay sample
between the time of collection and the beginning of the assay, and
the results are not indicative of lake conditions at the time of
sampling. However, based on the level of nutrients measured at
the time the sample was collected, the potential primary produc-
tivity would have been moderate.
The lake data indicate nitrogen limitation during July (N/P
ratio = 4/1) and October (N/P = 6/1) and phosphorus limitation
in September (N/P = 14/1).
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8
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 tribu-
tary sites indicated on the map (page vi), except for the months of
April and May when two samples were collected. Sampling 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 determined
by using a modification of a U.S. Geological Survey computer program for
calculating stream loadings*. Nutrient loadings for unsampled “minor
tributaries and immediate drainage” (“ZZ” of U.S.G.S.) were estimated by
using nutrient loads, in lbs/mi 2 /year, at station C—l and multiplying by
the ZZ area in mi 2 .
The City of Glenwood did not participate in the Survey, and nutrient
loadings were estimated at 2.5 lbs P and 7.5 lbs N/capita/year. The
estimated Glenwood nutrient loads exceeded the loads measured in the
unnamed ditch at station B-l, and the non-point loads of the ditch were
estimated in the same way as the ZZ loads.
* See Working Paper No. 1.
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9
A. Waste Sources:
1. Known municipal* -
Pop. Mean Receiving
Name Served Treatment Flow (mgd) Water
Glenwood 2,584 act. sludge O.258** ditch to
Lake Minnewaska
2. Known industrial - None
* Anonymous, 1974.
** Breimhurst, 1965.
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10
B. Annual Total Phosphorus Loading - Average Year:
1. Inputs -
lbsP/ %of
Source yr total
a. Tributaries (non-point load) -
Unnamed Ditch (B-i) 50 0.5
Pelican Lake outlet 830 8.9
b. Minor tributaries & immediate
drainage (non—point load) - 500 5.3
c. Known municipal -
Glenwood 6,460 69.2
d. Septic tanks* - 390 4.2
e. Known industrial - None - -
f. Direct precipitation** - 1,110 11.9
Total 9,340 100.0
2. Outputs —
Lake outlet - 940
3. Net annual P accumulation - 8,400 pounds
* Estimate based on 351 seasonal, 91 permanent homes, and 12 resorts
on the lakeshore; see Working Paper No. 1.
** See Working Paper No. 1.
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11
C. Annual Total Nitrogen Loading - Average Year:
1 . Inputs —
lbs N! % of
Source yr total
a. Tributaries (non-point load) -
Unnamed Ditch (B-l) 1,490 1.0
Pelican Lake outlet 26,410 18.1
b. Flinor tributaries & immediate
drainage (non-point load) - 16,020 10.9
c. Known municipal -
Glenwood 19,380 13.2
d. Septic tanks* - 14,490 9.9
e. Known industrial - None -
f. Direct precipitation** - 68,500 46.8
Total 146,290 100.0
2. Outputs -
Lake outlet 31,270
3. Net annual N accumulation - 115,020 pounds
Estimate based on 351 seasonal, 91 permanent homes, and 12 resorts
on the lakeshore; see Working Paper No. 1.
** See Working Paper No. 1.
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12
D. Mean Annual Non-point Nutrient Export by Subdrainage Area:
Tributary lbs P/mi 2 /y ’ lbs NJmi 2 /yr
Pelican Lake outlet 18 572
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 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
Units Total Accumulated Total Accumulated
lbs/acre/yr 1.3 1.2 20.6 16.2
grams/m 2 /yr 0.15 0.13 2.3 1.8
Volle 2 weider loading rates for phosphorus
(g/m /yr) based on mean depth and mean
hydraulic retention time of Lake Minnewaska:
“Dangerous” (eutrophic rate) 0.14
“Permissible” (oligotrophic rate) 0.07
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13
V. LITERATURE REVIEWED
Anonymous, 1974. Wastewater disposal facilities inventory. MPCA,
Minneapolis.
Breimhurst, Lawrence H., 1965. Report on operation of oxidation
ditch sewage treatment plant, Glenwood, Minnesota. MN Dept.
of Health, Minneapolis.
Peterson, George, and Kyle Bishop, 1971. Report on investigation
of water quality of Lake Minneswaska, Pope County. MPCA,
Minneapolis.
Schilling, Joel, 1974. Personal communication (lake map). MPCA,
Minneapolis.
Vollenweider, Richard A., (in press). Input-output models. Schweiz
A. Hydrol.
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VII. APPENDICES
APPENDIX A
TRIBUTARY FLOW DATA
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T IBIjTA Y FLOW INFOPMAT!ON FOR ‘4INNESOTA
10/30/74
LA (E CODE ‘7#5 1
M1NN ’ A 4 LA’c
TOTAL AtNAC 4 CA OF LAKE
(4. 00
TOTAL P AIWA(E A iA OF LA
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I ‘ - ‘ JT - “ ‘1 I iNF(- F ATE 0 ‘4 r.9 NNFSQT
10/30/74
L
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APPENDIX B
PHYSICAL and CHEMICAL DATA
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STr)RET ‘ FjT FvnI OAT 7 ./1 /30
?7—1C1
4 - 07.0 095 )3 56.9
INWF AS 4 LA
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STOPET PET tEVAL OAT 74/Io/30
276102
‘.5 36 12.0 095 28 30.0
MINNEWASKA LAP(E
27 MINNESOTA
DATE
FPOM
TO
TIME DEPTH
OF
DAY FEET
UEPALES 2111202
3 0025 FEET DEPTH
72/07/06 17 15 0000
17 IS 0010
17 15 0023
72/09/01 14 20 0000
14 20 0004
14 70 0015
14 20 0024
72/10/25 13 40 0000
LI 40 0004
13 40 0015
13 40 0024
8?
72
00010
00300
00077
0009’.
00400
00410
00630
00610
00665
00666
WATER
00
IRANSP
CNDUCTVY
PPI
I ALK
N02&N03
NI13—N
PHOS—TOT
PHOS—DIS
TF iP
SECCHI
FIELD
CACO3
N—TOTAL
TOTAL
CENT
MG/L
INCHES
MICPOMHO
SU
MG/L
M&/L
MG/L
MG/L P
MG/I P
11.0
590
8.40
242
0.030
0.030
0.028
0.014
14.0
580
8.40
230
0.030
0.030
0.027
0.014
4.4
595
640
8.20
8.55
250
228
0.050
0.080
0.150
0.120
0.039
0.031
0.130
0.030
F •7
640
8.55
212
0.080
0.130
0.029
0.019
7.?
645
8.50
220
0.100
0.130
0.044
0.016
.7
645
675
8.45
8.60
230
180
0.120
0.070
0.150
0.070
0.030
0.030
0.013
0.014
10.0
650
8.60
240
0.050
0.060
0.037
0.019
lfl.1
660
8.60
220
0.060
0.070
0.048
0.028
10.0
6S0
8.60
200
0.060
0.070
0.047
0.025
21.5
20.0
‘O.S
70.5
‘0 • I
19.8
6.?
6.2
3”I I
(‘.-IL.)DI-l “L
C’
q•c,j
& .( J
3•4J
)ATE
FR 01
TO
72/07/06
72/09/0 1
7 2/I 0/?
TIME 0EDT
0F
flAY FEET
17 15 0000
4 70 ?000
11 ‘0 0000
J Vi LUE KNOWN TO BE I’) FRRO
-------
ST’)’4E1 T 1EVAI OATP 7 /1 ’’3C
r * T
T
‘
I • Y r—
‘7 n 11) 3
4 6 P 5.0 tp II ‘)O.()
M1?’J.\J ASKA LA
I II- P ( S
3
72/ rI 7/.p,
77/39/0 I
72/ 10/25
37 45 1 1)9(1
I’ . 0 10fi
14 30 (10 1))
•1• J
?l I 1202
Ulb 1• FEI T 1)EPT,-I
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7 AL ”
N (Jr’*.N(j3
NH3—N
-‘NOS—TOt
PHOS—DIS
F 0r.
flF
F I -
5ECC -!
F IFLU
CACO1
N—I i)TAL
TOT 4L
7’)
I>AY
Fr T
( IT
“.‘I
INS
‘1IC ’0MHO
S(J
G/L
M! 3 /L
1iG/L
MG/L P
MG/L
72/07/0 ’-
Il 45 U0 0
‘ .‘
q(,
60 ( 1
R.40
?? I
0.050
0.040
0.025
0.011
I? 5 “fl1 ’
590
)- .49
0
0.030
u.04 0
0.031
0.012
37 e5 )?l
‘9.
.4
6 )1 ))
R.30
22’.
0.060
0.060
0. O4u
0.014
72/09/0 1
34 613 300)1
‘0 .
630
S. ,?
2I
0.100
0.330
0.02
0.014
1 4)1 P 1 ’
20.1
6’+0
r .S?
0.09t
0.120
0.033
0.013
I ’. -.0 0i
7 .-i
40
.59
.fl ’
u.09 0
0.130
0.033
0.015
1’. 4)1
(•)‘O
70.3
7.’
790
c4•5
2-.?
0.0 0
0.150
0.030
0.016
7?/Ir)/2
3 .
“‘)09
650
0.060
0.070
0.03?
0.017
I’. 00 091’
‘.
I . ‘
‘ -C’
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200
0.0-,0
0.0e O
0.03 1 )
0.022
i . ‘0 “.33 ’-
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0.043
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I l
J ViLU KNI1 . N rr3 h 1 - FR4f -
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APPENDIX C
TRIBUTARY DATA
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STOPET r ETRIFVAL DATE 74/10/30
276141 LS276141
45 36 30.0 095 32 00.0
OUTLET CREEK
27019 7.5 STARBUCK
0/LAKE MINNEWASKA
ST HWY 29 BPDC S OF STARBUCPc
I IEPALES 2111204
4 0000 FEET DEPTH
006)0 00671 006o5
DATE TIME DF Tr4 JO? NOJ TOT KJFL Nr-13—N P’-iOS—DIS PHOS—TOT
FPOM OF i 1—1DTAL N TOTAL OPT’-lO
ID DAY FEFT Mfl/L ‘-lO/L M /L MG/L P PO/L P
72/ )0/15 09 30 0.104 0. 60 0.126 0.009 0.017
7?/I1/10 10 6P 0.04? 0.050 0.006K 0.005K 0.037
7?/I?/0 1230 C .01? 0.f’70 0.011 0.005K 0.016
73/01/27 17 23 ,.115 0.960 0.169 0.025
71/02/0 ii 20 ‘).0 1 0. L+0 0.0?Q 0.005K 0.0)5
73/01/10 10 45 0.056 1.’-0O 0.154 0.023 0.023
73/04/16 10 66 0.013 0.090 0.056 0.005K 0.030
71/04/10 (? 10 0.010 K 1.70 0.026 0.008 0.040
73/06/20 1? 10 1’. O ) l 1.200 0.054 0.005K 0.030
71/06/11 1300 ).0 )Cs 0.060 0.011 0.040
73/07/17 11 30 f.0ll 1. 50 0.0)9 0.008 0.036
71/08/07 11 30 0.O Iuc C.940 0.1?0 0.018 0.040
71/09/10 14 45 0.010K 1.000 0.038 0.012 0.050
K V. LUF KNOWN TO F E LESS
THAN INDICATED
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STO ET FTr’ [ E iAI i)AT T 7’e/1 I/ i C
7 1H1 LS276l 1
45 19 30.0 095 24 00.0
UNNAMED DITCh TO L 11NNE AS A
27 7. (,LENWOOI)
1/LAKE MINNtWASKA
r1 Y5 2 /29 W GLENW000 BELOWSTP
11 PALES 2111204
4 0000 FEET DEPTH
(“‘63C 30 - 061() 00671 00655
r ArF: TIMF fWPT-l ‘IO? .NO3 TOT KJFL ‘i3-N Pr-tQS—’) [ S PHOS—TOT
F’ OM O ‘ J—TOTAL N TOTA l OPt -’fl
TO OAY FEET ‘ /L 4r /L ‘ i3/L MG/L P MG/L P
7?/ 10/ 1’-,Oq OO ). 23 1’ J. 1 54 i. IOIi 1.130
72/11/U) 10 IP I.71cp 5• f) (. ‘i.C54
71/0’/O . II 00 4.7 0 ‘.“7( 0. ’ 0 1.100
73/ f l/Il ) 10 30 .1C) 0.-i ) C.l3 0. 305
71/04/15 10 35 0.710 1.00” 1.?00
73/04/10 11 40 ‘.10) 3•L l )) 1. ” O 1.57’)
73/05/20 ii 40 1.’IO 1. ’40 1.415 1.f00
71/05/30 Ii 40 1.750 1.300 1.570
71/0’/l1 J7 30 .30O 3• ’_)1 1. 5 )0 1. s00 2.000
71/07/17 11 eC ‘.300 ‘.7w) 1. t,0 1.740
73/0 l/07 12 0 7.10U 3.10 1. 7C, 2.000 2.100
7 1 /QQ/jO 14 ?5 4.100 1.000 7.100 3.15.)
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ST’)PET RETP TEVAL DATE 7L,/l0/J0
?7t- 1C1 L3?761C1
45 39 00.0 095 25 00 0
PELICAN LAKE fLAKE MINNEwASKA CN
7.5 C,LENWOQ [ )
T/LAtSE M!NNFWASKA
2ND ROAD XING SW OF LONG BEACH
IIFPALES 2111204
4 0000 FEET DEPTH
oo 30 ‘ ( 1 ( 5 00 10 0 ( 1 7I 0o66c
DATE TIME DE TH N07&N03 TOT KJFL N -l3-N PhOS—DIS PHOS-TOT
FROM OF N—TOTAL N TOTAL OPT O
TO DAY FFFT -1Cj/L r,/i MG/L MG/L P MG/L P
7 2 ,10/ic 09 10 0.IS 5 1. 0fl 0.19P 0.019 0.048
72/fl/Il) 1(145 0 . 77 1 .’ 4Q 0.008 0.017 0.040
72/12/08 }? f, 1 . :H 1. 40 0.231 0.008 0.04?
73/02/06 H ( 15 ).120 1.7(10 0.490 0.005K 0.035
73/01/10 10 40 j.4 70 3.Q90 1.7’40 0.110 0.155
71/i)Le/15 10 40 0.010K 1.470 0.09 0.011 0.065
73/04/30 I I 50 i.0l? 1.’ 0 0.0 ’0 0.050
73/Q5/7fl U 50 C.013 1. 4 O ‘ .05 ’ s 0.005K 0.065
71/05/30 II 50 ( 1.016 1.300 0.060 0.011 0.055
71/0 /1I 17 45 0.0 fl 1.3B0 0.075 0.015 0.040
71/07/1 ii 05 o.03 1.540 0.u56 0.015 0.065
71/08/07 1750 ‘ .016 l. ’l’) 0.189 0. O1P 0.060
73/09/10 1435 1.0I ?.700 0.013 0.050
K VALUE KNOWN TO iE LFSS
THPN II11)ICATED
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