U.S. ENVIRONMENTAL PROTECTION AGENCY
NATIONAL EUTROPHICATION SURVEY
WORKING PAPER SERIES
REPORT
ON
ROCK LAKE
JEFFERSON COUNTY
WISCONSIN
EPA REGION V
WORKING PAPER No,
PACIFIC NORTHWEST ENVIRONMENTAL RESEARCH LABORATORY
An Associate Laboratory of the
NATIONAL ENVIRONMENTAL RESEARCH CENTER - CORVALLIS, OREGON
and
NATIONAL ENVIRONMENTAL RESEARCH CENTER - LAS VEGAS, NEVADA
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REPORT
ON
ROCK LAKE
JEFFERSON COUNTY
WISCONSIN
EPA REGION V
WORKING PAPER No, 46
WITH THE COOPERATION OF THE
WISCONSIN DEPARTMENT OF NATURAL RESOURCES
AND THE
WISCONSIN NATIONAL GUARD
OCTOBER, 1974
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CONTENTS
Page
Foreword ii
List of Wisconsin Study Lakes iv, v
Lake and Drainage Area Map vi
Sections
I. Conclusions 1
II. Introduction 2
III. Lake and Drainage Basin Characteristics 3
IV. Lake Water Quality Summary 4
V. Nutrient Loadings 9
VI. Literature Reviewed 14
VII. Appendices 15
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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 [ g3l4(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.
ACKNOWL EDGMENT
The staff of the National Eutrophication Survey (Office of
Research & Development, U. S. Environmental Protection Agency)
expresses sincere appreciation to the Wisconsin Department of
Natural Resources for professional involvement and to the Wis-
consin National Guard for conduct of the tributary sampling
phase of the Survey.
Francis H. Schraufnagel, Acting Assistant Director, and Joseph
R. Ball of the Bureau of Water Quality, and Donald R. Winter, Lake
Rehabilitation Program, provided invaluable lake documentation and
counsel during the Survey. Central Office and District Office per-
sonnel of the Department of Natural Resources reviewed the prelim-
inary reports and provided critiques most useful in the preparation
of this Working Paper series.
Major General James J. Lison, Jr., the Adjutant General of
Wisconsin, and Project Officer CW-4 Donald D. Erickson, who directed
the volunteer efforts of the Wisconsin National Guardsmen, are also
gratefully acknowledged for their assistance to the Survey.
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iv
NATIONAL EUTROPHICATION SURVEY
STUDY LAKES
STATE OF WISCONSIN
LAKE NAME COUNTY
Altoona Eau Claire
Beaver Dam Barron
Beaver Dam Dodge
Big Eau Pleine Marathon
Browns Racine
Butte des Morts Winnebago
Butternut Price, Ashland
Castle Rock Flowage Juneau
Como Walworth
Crystal Vilas
Delavan Walworth
Eau Claire Eau Claire
Elk Price
Geneva Walworth
Grand Green Lake
Green Green Lake
Kegonsa Dane
Koshkonong Jefferson, Rock, Dane
Lac La Belle Waukesha
Long Price
Middle Walworth
Nagawicka Waukesha
Oconomowoc Waukesha
Okauchee Waukesha
Petenwell Flowage Juneau
Pewaukee Waukesha
Pigeon Waupaca
Pine Waukesha
Poygan Winnebago, Waushara
Rock Jefferson
Rome Pond Jefferson, Waukesha
Round Waupaca
Shawano Shawano
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V
LAKE NAME COUNTY
Sinnissippi Dodge
Swan Columbia
Tainter Dunn
Tichigan Racine
Townline Oneida
Trout Vilas
Wapogassett Polk
Wausau Marathon
Willow Oneida
Winnebago Winnebago, Fond Du Lac,
Calumet
Wisconsin Columbia
Wissota Chippewa
Yellow Burnett
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vi
ROCK
)
( .
Map Location
ROCK LAKE
® Tributary Sampling Site
X Lake Sampling Site
Direct Drain qe Area Boundary
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ROCK LAKE
STORET NO. 5564
I. CONCLUSIONS
A. Trophic Condition:
Survey data indicate Rock Lake is in a relatively good tro-
phic condition, and it is concluded the lake is mesotrophic.
B. Rate-Limiting Nutrient:
Algal assay results indicate Rock Lake was phosphorus limited
at the time the sample was collected. Lake data indicate Rock
Lake may be nitrogen limited at times.
C. Nutrient Controllability:
There are no known point sources contributing nutrients to
Rock Lake, and there are no major tributaries.
It is noted that the estimated phosphorus loading rate during
the year of sampling was less than that proposed by Vollenweider
(in press) as “permissible”; i.e., an oligotrophic rate (see page
13).
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2
II. INTRODUCTION
Rock Lake was included in the National Eutrophication Survey because
of the special interest of personnel of the Wisconsin Department of Natural
Resources. There are no known point sources of nutrients to the lake, and
there are no major tributaries. Survey sampling of Rock Creek was related
to impacts on Koshkonong Lake downstream in the Rock River drainage.
Although a natural lake, the water level of Rock Lake was altered con-
siderably by the construction of an outlet dam (10-foot head) in 1865.
The drainage basin is quite small, and much of it is wetlands. The pri-
mary land use is agricultural--mainly dairying. The City of Lake Mills
borders most of the east shore.
Rock Lake is intensively used for recreation, and swirnning, boating,
and fishing are popular. Game fish present include northern pike, wall-
eye, large- and smallmouth bass, and panfish; carp are also present but,
reportedly, not in problem numbers (Poff, et al., 1968).
Much of the shoreline is privately owned, but a city park and a county
park permit public access. Boat launching facilities are provided, and
commercial facilities provide services.
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3
III. LAKE AND DRAINAGE BASIN CHARACTERISTICS
A. Lake Morphometry*:
1. Surface area: 1,161 acres.
2. Mean depth: 18.4 feet.
3. Maximum depth: 56 feet.
4. Volume: 21 ,342 acre/feet.
5. Mean hydraulic retention time: 3.6 years.
B. Tributary and Outlet:
(See Appendix A for flow data)
1 . Tributaries -
Name Drainage area Mean f1ow
(No major tributaries)
Minor tributaries & 2
immediate drainage - 12.0 mi 8.2 cfs
Totals 12.0 mi 2 8.2 cfs
2. Outlet -
Rock Creek 14.1 mi 2 8.2 cfs
C. Precipitationttt:
1. Year of sampling: 37.7 inches.
2. Mean annual: 30.2 inches.
* Dept. of Natural Resources lake survey map (1955).
t Drainage areas are accurate within ±0.5%; mean daily flows are accurate
within ±40%; mean monthly flows are accurate within ±35%; and normalized
monthly flows are accurate within ±35%.
±1 Includes area of lake.
tt1 See Worki ng Paper No. 1 , “Survey Methods”. /
- nv,ronxn i”al Roeo3xQh C i
35th 5r et
Co Orc; n 97 O
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4
IV. LAKE WATER QUALITY SUMMARY
Rock 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 one
station on the lake and from a number of depths (see map, page vi).
During each visit, a single depth-integrated (15 feet or near bottom
to surface) sample was collected for phytoplankton identification and
enumeration; and during the last visit, a single five-gallon depth-
integrated sample was collected for algal assays. The maximum depth sam-
pled was 22 feet.
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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5
A. Physical and chemical characteristics:
FALL VALUES
(11/10/72)
Parameter Minimum Mean Median Maximum
Temperature (Cent.) 7.2 7.2 7.2 7.2
Dissolved oxygen (mg/i) 10.9 10.9 10.9 11.0
Conductivity (pnihos) 380 387 380 400
pH (units) 8.4 8.4 8.4 8.4
Alkalinity (mg/i) 167 173 172 179
Total P (mg/i) 0.012 0.016 0.017 0.018
Dissolved P (mg/i) 0.007 0.008 0.008 0.009
NO + NO (mg/i) 0.110 0.110 0.110 0.110
Ani onia mg/l) 0.100 0.110 0.110 0.120
ALL VALUES
Secchi disc (inches)
72 91
94 108
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6
B. Biolooical characteristics:
1. Phytoplankton -
Sampling Dominant Number
Date Genera per ml
06/23/72*
08/20/72 1. Chroococcus 1,519
2. Fragilaria 040
3. Gloeocapsa 452
4. Dinobryon 145
5. Scenedesnius 145
Other aenera 361
Total 3,562
11/10/72 1. Microcystis 1,468
2. Synedra 3C4
3. Dinobryon 282
4. Melosira 202
5. Flagellates 58
Other genera 354
Total 2,668
* Sample lost in shipment.
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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 )
06/23/72 01 7.9
08/20/72 01 4.8
11/10/72 01 11.7
C. Limiting Nutrient Study:
1. Autoclaved, filtered, and nutrient spiked -
Ortho P Inorganic N
___________ Conc. (mg/l) Conc. (mg/i ) _____________
0.007 0.136
0.013 0.136
0.019 0.136
0.031 0.136
0.067 0.136
0.067 10.136
0.007 10.136
Spike (mg/i )
Control
0.006 P
0.012 P
0.024 P
0.060 P
0.060 P + 10.0 N
10.0 N
2. Di
Maximum yield
( mg/i-dry wt. )
0.3
3.2
4.2
4.3
4.5
31 .3
0.8
scussion —
The control yield of the assay alga, Selenastrum capri-
cornutum , indicates that the potential primary productivity
of Rock Lake was relatively low at the time the sample was
collected.
It is noted that there was some loss of nitrogen between
sample collection and the beginning of the assay, but this
is unlikely to have affected the control yield because the
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8
sample was phosphorus limited. Note the increased yields
with increased levels of orthophosphorus (to about 0.020 mg/i)
and the lack of significant response to the addition of only
nitrogen.
The lake data also indicate phosphorus limitation at
the time the sample was collected as well as during the
August sampling. The N/P ratio was 28/i both times. How-
ever, in June the ratio was only 5/1 , and nitrogen limita-
tion would be expected at that time.
D. Trophic Condition:
Survey data indicate Rock Lake to be in a relatively good
trophic condition. Of the 46 Wisconsin lakes studied, 37 had
greater mean total phosphorus, 36 had greater mean dissolved
phosphorus, and 38 had greater mean inorganic nitrogen. Although
18 of the study lakes had less mean chlorophyll a, only 7 had
greater Secchi disc transparency. Some depression of dissolved
oxygen with depth was noted during the August Survey sampling.
It is noted that sampling in 1960 by the Department of Natural
Resources (Poff, et al ., 1968) showed distinctly higher levels of
phosphorus and nitrogen than were measured during the Survey; how-
ever, the differences may be due to elimination of or changes in
nutrient sources in the intervening 12 years.
On the basis of the Survey data, it is concluded that Rock Lake
is mesotrophic.
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9
V. NUTRIENT LOADINGS
(See Appendix C for data)
For the determination of nutrient loadings, the Wisconsin National
Guard collected a monthly near-surface grab sample from the outlet site
indicated on the map (page vi), except for the high runoff months of April
and May when two samples were collected. The other Rock Creek sites were
sampled in relation to Koshkonong Lake. Sampling was begun in September,
1972, and was completed in August, 1973.
Through an interagency agreement estimates of the outlet and ini iediate
drainage flows for the year of sampling and a “normalized” or average year
were provided by the Wisconsin District Office of the U.S. Geological Sur-
vey.
In this report the nutrient loadings were determined for station A l
by using a modification of a U.S. Geological Survey computer program for
calculating stream loadings*.
Nutrient loads for “minor tributaries and immediate drainage” (“ZZ”
of IJ.S.G.S) were determined by using the pounds per square mile per year
calculated for station A-i and multiplying that by the ZZ area in square
miles. It is recognized that the phosphorus loads estimated for ZZ in
this way are conservative, since a significant but unknown portion of
the phosphorus reaching the lake via the immediate drainage would be
trapped in the lake and thus would not be included in the load at A-l
* See Working Paper No. 1.
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10
In the preliminary version of this report, estimates of septic tank
nutrient contributions were included. However, personnel of the Wisconsin
Department of Natural Resources advise that the lakeshore area is sewered
(Narf, 1974).
A. Waste Sources:
1 . Known municipal - None
2. Known industrial - None
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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) -
(No major tributaries)
b. Minor tributaries & immediate
drainage (non-point load) - 310 63.3
c. Known municipal STP’s - None
d. Septic tanks - None known
e. Known industrial - None -
f. Direct precipitation* - 180 36.7
Total 490 100.0
2. Outputs -
Lake outlet - Rock Creek 360
3. Net annual P accumulation - 130 pounds.
* See Working Paper No. 1.
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12
C. Annual Total Nitrogen Loading - Average Year:
1. Inputs -
lbs N I % of
Source _______ total
a. Tributaries (non-point load)-
(No major tributaries)
b. Minor tributaries & immediate
drainage (non—point load)- 15,720 58.4
c. Known municipal STP’s — None
d. Septic tanks - None known
e. Known industrial - None - -
f. Direct precipitation* - 11,190 41.6
Total 26,910 100.0
2. Outputs -
Lake outlet - Rock Creek 18,470
3. Net annual N accumulation - 8,440 pounds.
* See Working Paper No. 1.
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13
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 “permi ssi ble”.
Total Phosphorus Total Nitrogen
Units Total Accumulated Total Accumulated
1bs/acr /yr 0.4 0.1 23.2 7.3
grams/rn /yr 0.05 0.01 2.6 0.8
Volle weider loading rates for phosphorus
(g/m /yr) based on mean depth and mean
hydraulic retention time of Rock Lake:
“Dangerous” (eutrophic rate) 0.24
“Permissible” (oligotrophic rate) 0.12
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14
VI. LITERATURE REVIEWED
Anonymous, 1972. Wisconsin lakes. Pubi. 218-72, Dept. of Natural
Resources, Madison.
Lueschow, Lloyd A., 1972. Biology and control of selected aquatic
nuisances in recreational waters. Techn. Bull. #57, Dept. of
Natural Resources, Madison.
Narf, Richard P., 1974. DNR intra-department memorandum (review of
preliminary Rock Lake report). Dept of Natural Resources, Madison.
Stautz, Floyd, Dick Narf, Jerome McKersie, and George Hansel , 1969.
Report on an investigation of the pollution in the Upper Rock
River drainage basin made during 1967-68. Dept. of Natural
Resources, Madison.
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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TRIBUTARY FLOW INFORMATION FOR WISCONSIN
9/30/74
NOTE °‘° NO SITE AT INLET —
MEAN MONTHLY FLOWS AND
TRIBUTARY MONTH YEAR
5566A1 9 72
10 72
11 72
12 72
73
2 73
3 73
4 73
5 73
6 73
7 73
B 73
TOTAL DRAINAGE AREA OF LAKE =
SUM OF SUB-DRAINAGE AREAS =
INFLOWS NOT CALCULATED
DAILY FLOWS
MEAN FLOW DAY
5.40 23
6.00 22
5.30 26
1.80 16
33.00
42.00 11
60.00 18
32.00 6
39.00 4
11.00 16
0.90 1
0.50 26
26 36.00
25 30.00
TOTAL FLOW IN =
TOTAL FLOW OUT =
LAKE CODE
5564 ROCK
LAKE
TOTAL OPAINAGE AREA
OF
LAKE
14.10
TRIBUTARY
SUB—DRAINAGE
AREA
JAN
FEB
MAR
APR
MAY
NORMALIZED
JUN JUL
FLOWS
AUG
SEP
OCT
NOV
DEC
MEAN
5S64A1
5564ZZ
14.10
0.0
4.90
0.0
6.50
0.0
15.00
0.0
17.00
0.0
9.10
0.0
12.00 6.10
0.0 0.0
4.60
0.0
5.70
0.0
6.00
0.0
7.10
0.0
4.80
0.0
8.22
0.0
SUMMARY
14.10
0.0
DAY
0.0
98.80
FLOW DAY FLOW
FLOW
9.20
3 • 40
2.90
1.60
50.00
82.00
26.00
49.00
9.80
1.50
0.70
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APPENDIX B
PHYSICAL and CHEMICAL DATA
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STORET RETRIEVAL DATE 74/09/30
556401
43 05 00.0 088 55 30.0
ROCK LAKE
55 WISCONSIN
11EPALES 2111202
0012 FEET
DATE
FROM
TO
7?/ OF,/23
72/08/20
72/ I 1110
TIME DEPTH
OF
DAY FEET
13 05 0000
10 45 0000
iS 30 0000
32217
CHLRPHYL
A
UG/L
7.9J
4.RJ
11 • 7J
5
DEPTH
00010
00300
00077
00094
00400
00410
00630
00610
00665
00666
DATE
TIME
DEPTH
WATER
DO
TRANSP
CHD(JCTVY
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
StJ
MG/I.
MG/L
HG/L
HG/L P
MG/L P
72/06/23
13 05 0000
19.0
8.6
72
385
8.30
184
0.100
0.070
0.038
0.033
13 05 0008
19.2
8.8
355
8.40
183
0.100
0.040
0.043
0.027
72/08/20
10 45 0000
94
370
8.45
173
0.080
0.100
0.013
0.007
10 45 0004
25.7
9.0
370
8.50
174
0.100
0.090
0.010
0.006
10 45 0015
23.5
7.9
380
8.40
176
0.070
0.080
0.011
0.007
10 45 0022
20.8
6.2
380
8.30
179
0.090
0.180
0.013
0.007
72/11/10
15 30 0000
108
400
8.40
167
0.110
0.120
0.012
0.008
15 30 0004
7.2
11.0
380
8.40
172
0.110
0.110
0.017
0.007
15 30 0015
7.2
10.9
380
8.40
179
0.110
0.100
0.018
J VALUE KNOWN TO BE IN ERROR
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APPENDIX C
TRIBUTARY DATA
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ST’)PET RETPIEVAL DATE 74/lt)/02
LS5564A1
‘ .3 05 00.0 0R 55 Ofl.0
OCt C EEK
55 15 ‘ TEI LOO
O/QOCrc LArSF
EA) OF CRFEK IN LAKESIDE PAPK
11E ALFS ?111204
4 3000 FEET 1)EPT -1
00633 006?R 00610 00671 006t5
1)ATE T1 1 [ DEPT -I NO2 .’JO3 TOT KJEL N’-43—N PriflS—flI Pi-i0S—T )T
rPO’i O - N—TOTAL N TOTAL OPT D
TO DAY FFFT M(,/j M(/L
7 / q/ 3 10 10 0.0 1 .000 0.135 0.005K 0.034
7?/IC/?’ 1 27 0.034 0. 60 ( .066 0.005K ( ‘.025
72/fl/ 16 55 0.061 0.Q 70 0.0 3 0.005K 0.01
72/12/16 1350 0.073 0. 10 0.06 1 0. OC SK 1.017
73/0l/?3 15 05 0.13M 0. 60 0.07 0.006 0.010
71/02/11 1645 0.11 0.750 0.0k’. 0.005K
73/fl/1 09 25 0.160 1.200 0.147 0.005
71/16/06 1? 15 0.176 1.150 0.054 0.005K 0.015
73/fl’./. ” 3 00 0.1’ 9 0.’ 30 0.033 0.00 ’ 3.01
71/05/0 16 35 0.270 1.150 0.07? 0.007 0.025K
71/05/25 11 45 0.730 1.’60 0.07? 0.00 5K 0.015
73/06/16 13 ?0 0.154 1.150 0.062 0.005K 0.020
73/07/01 0.060 1.470 1. 0R4 0.016 0.047
73/0 / 6 1? S$ 0.0? O.M40 1.01 0.00 0.0 1 ’
K VALU- r NO ’N TO -4 LE
T \N 1 ”D1C. TFI)
-------
STD ET PF:TP!FVAL DATF 74/10/0?
S5 ,4A2
1.1 0’-, 00.0 04? 54 00.0
ROCK C ’EEK
cc-;
IS WATERLOo
L 55564A ?
1/ jCr LA F
LA E r X1NC E EO(,L LK MILLS AHOVE STP
1 1EPALES 2111204
4 3000 FEET DEPTH
0U 63 J
fl06?c
00610
00 67J
006f
r)ATE
TIHE
DFI’TM
NO 2 O3
TOT KJEL
N -i3 i
r4OS—r)IS
PHOS—TOT
FQOM
c
N—TOTAL
N
TOTAL
OPT’ -”3
TO
DAY
FEET
MO/L
UG/t
M(,/
Mr /L P
M(/L
1?/09/?3
10
00
C.1?0
0. 50
0.13?
0.005K
0.2P0
7?/10/2
11
‘3
0.240
0.° . 0
fl.OSP
0.2e0
0.4 0
7?/I1/?6
17
05
0.260
1.?60
0.157
0.015
0.100
77/12/I f ’
13
40
O.2P)
1.)fl)
0.23f’
0.01?
0.0- ,’
73/01/?3
15
00
3. 2 +0
1.540
0.1?0
3.0J
0.050
73/02/11
16
51
0. Illi
0.750
0.0 4M
0.0)2
0.015
73 / 33 f 1
09
20
0.1 6
0. ’.0
0.140
3.00 5k
3.J3
73/)4/0”
1’
04
3.?10
1.470
1.36 0
0.007
71/04/?f’
0
15
0.149
1.400
0.049
0.001
0.030
71/05/0 ’
16
‘0
0.200
1.600
0.079
0.013
0.035
71/05/25
)1
‘5
0.211)
1.470
0.OSP
O.00 ’ - ’K
0.010
73/06/lb
13
29
0.5 20
2.00 ’)
0.530
Q. 07R
0.210
71/07/01
0.07?
1.15’)
0.1)5?
0.011
0.065
73/05/76
13
03
0.250
1.470
C. )6R
0.0??
0.125
VALU ’ NO N TO LS
T ’-4 N 11,.JICATE1)
-------
STET RETP!FVAL DATE 74/10/02
c 64a3 LS5564A3
“3 )5 30.0 08 53 30.0
POCK C EFK
5c I’i ATF LO’)
T/ OCK LAKE
SI 30 x.ING NE OF LK 1LLS
1lE ALES 2111204
4 0000 FEET
AELO SIP
DEPTH
00630
006 S
00610
00671
00665
DATE
Tr’ E
DE T’i
r. O7 NO3
TOT KJEL
-I3—N
PHOS —flIS
P O —TOT
PDM
OF
N—TOTAL
“
TOTAL
()PTkO
TO
DAY
FFFT
Mc,/L
ic /t
‘i i/L
M /L P
7?/09/?1
09
45
0.550
0.S?0
0.I ’.5
0.230
72’/IO/??
1)
16
1.460
7.6 0
0.650
o.cs O
(i.’ 25
72/11/26
17
15
1.960
4.?00
0.P40
1.04w?
1.370
7?/1?/16
13
30
0.770
8.7 0
5.300
1.670
1.6 5
71/31/23
14
65
1.600
3.300
1.470
O.5 ?
0.7 0
71/0?/11
16
57
i.3 4 )
1.1 0
0. 50
0. 13B
o.i’ c
71/ 3/1’
3
15
3.57)
0.9 ’ 0
.1 +7
3.03
O . 2?0
71/04/06
11
55
0.700
7.900
0.630
0.374
0.500
73/04/?6
OP
23
0.460
?.qoo
0.?40
0.13?
0.1’ 0
73/C5/04
16
‘5
3.630
7.300
0. IPO
0.140
0.250
71/05/26
11
35
0.500
?.‘0O
0.376
0.750
0.’i 0
73/06/16
13
IS
1.9’O
3.360
1.3’S
0. O5
1. ISJ
7 3/37/•) 1
1. IPO
i.CoO
0.79 o
0.760
1.100
71/0’ /26
13
?.000
1. 90C
?.C00
O . 1O
1.653
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