U.S. ENVIRONMENTAL PROTECTION AGENCY
NATIONAL EUTROPHICATION SURVEY
WORKING PAPER SERIES
REPORT
ON
MUD LAKE
ITASCA COUNTY
MINNESOTA
EPA REGION V
WORKING PAPER No, 115
PACIFIC NORTHWEST ENVIRONMENTAL RESEARCH LABORATORY
An Associate Laboratory of the
NATIONAL ENVIRONMENTAL RESEARCH CENTER • CORVALLIS, OREGON
and
NATIONAL ENVIRONMENTAL RESEARCH CENTER - LAS VEGAS, NEVADA
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REPORT
ON
MUD LAKE
ITASCA COUNTY
MINNESOTA
EPA REGION V
WORKING PAPER No, 115
WITH THE COOPERATION OF THE
MINNESOTA POLLUTION CONTROL AGENCY
AND THE
MINNESOTA NATIONAL GUARD
JANUARY, 1975
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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 Summary 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 [ 5303(e)], water
quality criteria/standards review [ 5303(c)], clean lakes [ 53l4(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 Nationss
fresh water lakes. Likewise, rnultivariate 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 3. 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
Bi ackduck Bel trami
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 Home 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
Wailmark Chisago
White Bear Washington
Winona Douglas
Wolf Beltrami, Hubbard
Woodcock Kandiyohi
Zumbro Olmstead, Wabasha
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Map Location
Upper
Pan aca
I Lake
MUD LAKE
0 Tributary Sampling Site
X Lake Samplinçi Site
Sewage
Treatment Facility
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MUD LAKE, ITASCA COUNTY
STORET NO. 27C2
I. CONCLUSIONS
A. Trophic Condition:
Survey data show that Mud Lake is eutrophic. Of the 60
Minnesota lakes sampled in the fall of 1972 when essentially
all were well-mixed, 12 had greater mean total and dissolved
phosphorus, and 11 had greater mean inorganic nitrogen. Of
all 80 Minnesota lakes sampled, 7 had greater chlorophyll a
values, and all but one had greater Secchi disc transparency.
B. Rate—Limiting Nutrient:
Based on the results of the algal assay, nitrogen was the
limiting nutrient at the time the sample was collected. Nitro-
gen limitation is also indicated by the lake data; i.e., the
nitrogen to phosphorus ratios were less than 5/1 on both samp-
ling occasions.
C. Nutrient Controllability:
1. Point sources--The phosphorus load from the Marble
wastewater treatment plant was over 98% of the total load
reaching Mud Lake during the sampling year.
The present loading rate of 4.96 g P/m 2 /yr is over 17
times that proposed by Vollenweider (in press) as “dangerous”;
i.e., a eutrophic rate (see page 12). Because of the small
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2
volume of Mud Lake, it is calculated that only complete
removal of the phosphorus load from the Marble wastewater
treatment plant will achieve an acceptable loading rate
(0.06 g/m 2 /yr).
2. Non-point sources--The mean annual phosphorus load
from non-point sources amounted to 1.2% of the total load.
The tributary load was estimated to be less than 1% of the
total.
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II. LAKE AND DRAINAGE BASIN CHARACTERISTICS
A. Lake Morphometry :
1. Surface area: 56 acres.
2. Mean depth: 4.3 feet.
3. Maximum depth: 9 feet.
4. Volume: 241 acre-feet.
5. Mean hydraulic retention time: 243 days.
B. Tributary and Outlet:
(See Appendix A for flow data)
1. Tributaries -
Name Drainage area* Mean flow*
Unnamed Creek (A-l) 0.6 mi2 0.2 cfs
Minor tributaries & 2
immediate drainage - 0.5 mi 0.3 cfs
Totals 1.1 mi2 0.5 cfs
2. Outlet -
Unnamed Creek (B-l)** 1.2 mi2 0.5 cfs
C. Precipitation***:
1. Year of sampling: 22.6 inches.
2. Mean annual: 25.6 inches.
t Schilling, 1974; 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 mi2.
** Includes area of lake; outflow adjusted to equal the sum of the inflow.
*** See Working Paper No. 1, "Survey Methods".
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4
III. LAKE WATER QUALITY SUMMARY
Mud Lake was sampled twice 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 one station on
the lake and from a number of depths (see map, page vi). During each
visit, a single depth-integrated (near bottom to surface) sample was
composited for phytoplankton identification and enumeration; and during
the last visit, a single five-gallon depth-integrated sample was corn—
posited for algal assays. Also each time, a depth—integrated sample
was collected for chlorophyll a analysis. The maximum depth sampled
was 9 feet.
The results obtained are presented in full in Appendix B, and the
data for the fall sampling period, when the lake esentially 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
(10/22/72)
Parameter Minimum Mean Median Maximum
Temperature (Cent.) 3.5 3.5 3.5 3.5
Dissolved oxygen (mg/i) 8.1 8.1 8.1 8.1
Conductivity ( imhos) 330 330 330 330
pH (units) 8.5 8.5 8.5 8.5
Alkalinity (mg/i) 115 117 117 118
Total P (mg/i) 0.246 0.281 0.281 0.316
Dissolved P (mg/i) 0.169 0.171 0.171 0.173
NO + NO (mg/i) 0.390 0.415 0.415 0.440
Mi onia mg/1) 0.380 0.400 0.400 0.420
ALL VALUES
Secchi disc (inches) 6 9 9 11
B. Biological characteristics:
1. Phytoplankton* -
Sampling Dominant Number
Date Genera per ml
10/22/72 1. Anabaena 3,072
2. Flagellates 2,048
3. Chroococcus 1,386
4. Microcystis 392
5. Dinobryon 271
Other genera 873
Total 8,042
* The July sample was lost in shipment.
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6
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 )
07/12/72 01 34.8
10/22/72 01 139.9
C. Limiting Nutrient Study:
1. Autociaved, filtered, and nutrient spiked -
Ortho P Inorganic N Maximum yield
Spike (mg/i) Conc. (mg/i) Conc. (mg/i) ( mg/i—dry wt. )
Control 0.160 1.060 30.1
0.005 P 0.165 1.060 31.6
o.oio P 0.170 1.060 29.9
0.020 p 0.080 1.060 30.6
0.050 P 0.210 1.060 34.9
0.050 P + 10.0 N 0.210 11.060 92.6
10.0 N 0.160 11.060 78.4
2. Discussion -
The control yield of the assay alga, Selenastrum capri-
cornutum , indicates that the potential primary productivity
of Mud Lake was very high at the time the sample was col-
lected. Also the lack of any significant change in yields
with increased levels of orthophosphate until nitrogen was
also added indicates nitrogen limitation. Note that the
addition of only nitrogen resulted in a yield significantly
greater than that of the control yield.
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7
Nitrogen limitation is also indicated by the lake data
for each of the sampling periods; i.e., the nitrogen to phos-
phorus ratios were ,less than 5/1 on both occasions.
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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
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 deter-
mined by using a modification of a U.S. Geological Survey computer
program for calculating stream loadings*. Stream loadings shown are
those measured minus point source loads, if any.
Nutrient loadings for unsampled “minor tributaries and immediate
drainage” (“ZZ” of U.S.G.S.) were estimated using the means of the
nutrient loads, in lbs/mi 2 /yr, at station A-i and multiplying the
means by the ZZ area in m1 2 .
The operator of the Marble wastewater treatment plant provided
monthly effluent samples and corresponding flow data.
* See Working Paper No. 1.
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9
A. Waste Sources:
1. Known muncipal* -
Pop. Mean Flow Receiving
Name Served Treatment ( mgd) Water
Marble 682 act. sludge 0.141 Mud Lake
2. Known industrial - None
* Anonymous, 1974.
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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 Creek (A-i) 10 0.4
b. Minor tributaries & immediate
drainage (non-point load) - 10 0.4
c. Known municipal SIP’s -
Marble 2,450 98.8
d. Septic tanks - Unknown
e. Known industrial - None
f. Direct precipitation* — 10 0.4
Total 2,480 100.0
2. Outputs —
Lake outlet - Unnamed Creek (B-i) 130
3. Net annual P accumulation - 2,340 pounds
* See Working Paper No. 1.
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11
C. Annual Total Nitrogen Loading — Average Year:
1. Inputs -
lbs NI % of
Source yr total
a. Tributaries (non-point load) —
Unnamed Creek (A-i) 500 6.6
b. Minor tributaries & immediate
drainage (non-point load) — 420 5.6
c. Known municipal SIP’s —
Marble 6,190 81.9
d. Septic tanks - Unknown
e. Known industrial - None - -
f. Direct precipitation* - 540 5.9
Total 7,650 100.0
2. Outputs -
Lake outlet — Unnamed Creek (B-i) 1 ,500
3. Net annual N accumulation — 6,150 pounds
* See Working Paper No. 1.
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12
D. Mean Annual Non-point Nutrient Export by Subdrainage Area:
Tributary lbs P/m1 2 /yr lbs N/mi 2 /yr
Unnamed Creek (A-i) 23 831
E. Yearly Loading Rates:
In the following table, the existing phosphorus loading
rates are compared to those proposed by Vollenwelder (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 oligotrophic
if morphometry permitted. A mesotrophic rate would be consid-
ered one between “dangerous” and “permissible”.
Total Phosphorus Total Nitrogen
Units Total Accumulated Total Accumulated
1bs/acr /yr 44.3 41.8 137.0 110.2
grams/rn /yr 4.96 4.68 15.4 12.3
Vollenweider loading rates for phosphorus
(gfm 2 /yr) based on mean depth and mean
hydraulic retention time of Mud Lake:
“Dangerous” (eutrophic rate) 0.28
“Permissible” (oligotrophic rate) 0.14
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13
V. LITERATURE REVIEWED
Anonymous, 1974. Wastewater disposal facilities inventory. MPCA,
Minneapolis.
Schilling, Joel, 1974. Personal communication (lake map). MPCA,
Minneapolis.
Vollenweider, Richard A., (in press). Input-output models. Schweiz.
Z. Hydrol.
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VII. APPENDICES
APPENDIX A
TRIBUTARY FLOW DATA
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FRP3tJTA Y FLOW 1’iFO MAE10N FOP qN 1EsoTA 10/30/7 ’ .
LAKE C0’W ?7r7 A Jf) LAKF (ITAC.,CA CO.)
TOTAL th ATN ( F Ai I O LAM 1.1?
SJk—I)PA1NM, E ?!O AL1ZED FLOwS
TPTU PT4 Y AP tj JA, i MAP 4PM MAY JUN JUL AUG SEP OCT NOV DEC MEAN
27C2A ) 0.c6 O.0 0.t 0.17 O. 6 ‘L’,t3 u.52 0.L 3 0.06 0.10 0.13 0.04 0.10 0.24
?7C?3 1 1. 1’ 0.11 0.10 0.29 1. O 1.31 1.03 (J.’sO 0.17 0.25 0.44 0.24 0.27 0.54
?7C27Z fl .6 0.17 0.10 0.20 0.M 0. ’6 0.S2 0.20 0.04 0.14 0.23 0.12 0.20 0.29
SUMMARY
TOTAL ‘) A1NA0E AREA OF LAKE 1.12 TOTAL FLOw IN = 6.36
SUM lF SJ _r)RA1NAGF AREAS = 1.12 TOTAL FLOw OUT 6.47
MO”JTH( Y FL )* AND AILV FLOWS
TPT’3JTA’ Y r.IO”jJ-4 Yt.AM ‘AlAN FLOW DAY FIO J DAY 1L0W DAY 1104
?7C. ’A l II ) 7? 0.Cl 14 0.05
I I 7 O.J 19 0.04
12 72 0.13 9 0.10
I 73 O.1 ‘ 0.10
7 73 0.04 1 0.04
1 71 0.3k 17 0.50
73 0. 6 0.30
5 73 fl.4M 5 0.30 20 0.60
71 fl 4? 14 0.40
13 0.36 2’. 0.14
9 73 0.13 20 0.14
73 0.13
10 73 0.13
?7C? 3I 10 77 U. 0 14 0.20
II 7 0.?” 19 0.? ’ )
37 7? 0.14 c
7 0.31
2 73 0.19 1 0.? ’ )
3 73 ).“1 17 0.M0
4 71 0.54 S 0.60 19 0.50
5 71 1.09 ‘- 0.70 20 1.00
6 13 14 0.70
7 73 0.15 26 0.40
9 73 0.17 2C 0.33
9 71 0.31
10 73 (.31
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TPI’ IiTAPY FLOW 1NFO MATION FO MINNESOTA 10/30/74
L F COflF ‘7C? m LA F (ITASCA CO.)
‘FAN lONTHLY FLO9S P ii) JAILY FLOWS
T 1 tiTAPY MONI-4 YE ’ MEA,sJ PLOW PAY FLOW AY FLOW DAY FLOW
?7C??7 10 72 0.11 14
H 72 0.13 19 0.10
1’ 7? O. 5 9 0.70
1 73 0.33
7 0.1 1W 0.20
1 71 Q•4 7 17 3.10
4 73 i.2 0.30 19 0.?O
S 73 o•sc 0.30 ‘0 0.S0
71 0.4’ 14 0,40
7 73 O.1 0.21
73 0.1R ?0 0.19
9 73
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APPENDIX B
PHYSICAL and CHEMICAL DATA
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Sr3’ ET PETP!FV I ) T ./1 1 b/iO
27 C 201
47 1R Sc .0 093 17
MO LApSE
27 MINNESOTA
I IEPALES 211120?
3 0009 FEET OEPTH
OATF
F P.) fl U
TO
TPAF 1)F’-’T”l
OF
i)AY FFFT
10.0
7?/01/l’ 1 45 flf)fl()
IQ 4 •)004
1 Q 6’5 ( rp.),&
7?/I0/?2 15 (U) 0(U)’)
15 flfl • 0)F
(jfl,
))1 ’t
C P7
( U )1-)4
00400
00410
00630
00610
00665
00666
wAl
[ ()
1 A (?SP
C 1flIJCTVY
Pb- )
I ALP
NO? NO3
Ni-t3—N
PHOS—TOT
Pt-40S—DIS
T MP
S CCHI
FIFLi)
CACO3
N—TOTAL
TOTAL
CENT
IC ,/I
IN( - S
UCPOM-iO
SU
MC,/L
M(,/L
MG/L
M6/L P
MG/L P
.O
2 5 0
3.OO
84
0.160
0.180
0.500
0.330
300
33C
6.70
8.50
132
118
0.140
0.440
3.600
0.420
1.710
0.316
1.280
0.169
4 j
33)
R.5Q
115
0.390
0.380
0.246
0.173
73• )
I 7 A
1•5
‘I 7
C.-1L- HYL
34 • -P
c.
F P0
10
TP -W flF’ T’-i
1.A’i ’ FFFT
7?107117 I - 45 30)0
77/I0/? 1 . uO )fl1O
J VALUE KNOwN TO 3E IN EPP.iO
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APPENDIX C
TRIBUTARY and WASTEWATER
TREATMENT PLANT DATA
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STO?FT ?FT .TFVAI rAT 7 /1”/
?7C2A1 LS27C2A1
47 1’ 00.0 093 17 30.0
UNNAMED T 1-3 TO MU LK FPOM N
7.S CALUMFT
1/MUD LAKE
lj XIN 1wEEN CALUMETAND MA PL
I IEPALES 2111204
4 0000 FEET DEPTH
00671 0Cb65
DATF T T ‘-‘T ‘k’ C 3 Ti) r ‘ J - L ‘ -i’3—N P’-sOS— ’1S riOS—tUT
FPI)M OF — VT Li IThAL uP IHO
ro PAY F1 T 4 ’ ’/L ‘ ( ‘ / L I’J/L HG/L P
7?/I0/16 09 0 O.HO ( .0 S 0.006 0.U Ih
7?/)I/1Q 11 .P fl.I0 K o.C4C, .004’ o.i#so
7 ?fI?/0 1 00 l.l ()CK ).u?? u.O0c)K C.OOSK
71/01/0 s t 4C I.&f-’t ‘,.C ’7t 0.0C5 u.01c)
71/o’/l lo c I.c?u L .ICCt\ ).311 IJ.0 I)SK 0.010
7 /o /17 11 1c C. “.( ‘ ‘1 0.01? u.040
71/’JA/0 17 ?fl 3. 4J j.Cfl7 ‘).0J5r 0.0?O
7 fJ5/QS 1 O ..3’-i i. ?.7 i G.39 ) 0.009 0.025
71/05/?0 14 ) ) . 77’s . , (.0?? U .‘)i) 0.035
71/0 /16 j? 70 ) .5 p . ) O.OOc
71/ 7/2’, ?) 1.231 C.uH 0.007 0.025
71/0 ’4/?fl 1617 .11’ .. 1O C.3? 0.015 0.010
71f10/0 16 07 ‘j.3 ’ r .)- U 0.01’)
t( VALUE KNOWN TO NF LESS
THAN Ii’JDICATEi)
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STOPET PFTPIEVAL OAT 7 /10/ 30
??C2 31 LS27C2B1
47 1H 30.0 093 16 30.0
STP1 TO SE OUT OF MUD LAKE
27 7.5 CALUMET
O/ 1JD LAtSE
1 MI S Co ‘-IWY 12 US 169 JCT
11 F ’ ALES 2111204
4 0000 FEET DEPTH
0 ’ 1610 00671 00f 6S
DATE TIME DFPTH JU NO3 TOT KJEL NH3—N PHOS—Dic u-’HOS—TOT
FPOM OF N—TOTAL N TOTAL OPTMO
TO DAY FEET MG/L ‘ ( /L MG/L M(/ P MG/L P
7?/I0/ 14 0.400 1.700 0.?52 0.09P 0.350
7?/II/ 1430 l.51 ) 1. 1 0 0.510 0.025 0.110
7?/1?/0 ii 45 0.M?0 1.?03 0.210 0.01 0.015
73/01/06 1’. 00 0.960 G.500 j.?30 0.02 0.060
71/0?/IM 10 47 1.00t 0.170 0.?05 0.023 0.05?
73/01/17 1400 0.6-u 0.610 0.130 0.050 0.110
71/Q4/05 10 00 0.01)K 1.700 ( .O?’ 0.007 U.0 0
71/04/lu tO 05 i).0I0r 0 . -9S 0. O Ob 0.00 0.0)5
73/05/05 10 75 0.01 0.500 0.00 0.054 u. Of,5
71/05/20 Ii 20 3.01w 0.1) u.130 0.026 0.110
71/06/14 tO 20 Q.r46 p.300 f1.M60 0.0 0 0.1)5
73/07/26 19 50 0.113 0. I0 0.150 0.070 0.130
71/o8/2O 14 05 0.016 j. 7 5t) ‘1.043 fl.12M 0.290
71/10/01 IL. 79 0.’ ’ 0 0.110 0.037 0.0F 0
K VI LUE KNOWN TO BE LESS
THAN II’!DICATED
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STOPET RETRIEVAL DATE 74/10/30
?7C25) AS27C251 P000682
47 19 00.0 093 17 30.0
MARBLE
27 7.5 CALUMET
D/MUD LAKE
MUD LAKE
I IEPALES 2141204
4 0000 FEET DEPTH
00630 00625 00610 00671 00665 50051 50053
DATE TIME DEPTH NO2 .NO3 TOT KJEL NH3-N PHOS-DIS PHOS—TOT FLOW CONDUIT
FROM OF N—TOTAL N TOTAL ORTHO RATE FLOW—MOD
TO DAY FEET MG/L HG/L MG/L MG/L P MG/L P INST HOD MONTHLY
73/01/25 11 00
CPU)— 11.800 1.200 0.110 3.800 3.800 0.115 0.139
73/01/25 13 00
73/02/19 II 00
CPU)— 10.500 0.700 0.165 4.600 4.900 0.142 0.129
71/O?/19 13 00
73/03/19 11 00
CP(T)— 12.800 2.400 0.910 4.800 5.600 0.127 0.144
73/03/19 13 00
73/04/11, II 00
CPU)— l?.800 0.1 ,90 0.290 3.900 4.500
73/04/11, 13 00
73/05/21 11 00
CPU)— 15.650 0.600 0.240 5.900 6.900
73/05/21 13 00
73/07/19 II 00
CPU)— 19.000 0. 100K 0.086 7.100 7.500 0.330 0.450
73/07/19 13 00
73/08/22 Il 00
CPU)— 12.100 0.695 0.105 7.700 0.060 0.080
73/08/22 13 00
73/09/17 II 00
CPU)— 14.000 2.500 0.210 4.520 5.200 0.050 0.055
73/09/17 13 00
73/ 10/15 II 00
CP(T)— 10.200 1.100 0.026 2.700 3.500 0.127 0.115
73/l0/I 13 00
73/12/17 II 00
CP(T)— 12.1,00 3.700 0.072 4.400 6.400 0.075 0.052
73/12/17 13 00
74/01/21 II 00
C (T)— 7.400 0.500K 0.040K 2.900 3.200 0.119 0.102
74/01/21 13 00
74/02/IP II 00
CP(T)— 9.300 1.000K 0.040K 3.120 3.700 0.075 0.071
74/02/18 13 00
K VALUE KNOWN TO BE LESS
THAN INDICATED
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