U.S. ENVIRONMENTAL PROTECTION AGENCY
NATIONAL EUTROPHICATION SURVEY
WORKING PAPER SERIES
REPORT
ON
ZUMBROLAKE
LWTED AND WABASHA COMES
MINNESOTA
EPA REGION V
WORKING PAPER No, 137
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
ZUMBROLAKE
OLMSTH) AND WABASHA COUNTIES
MINNESOTA
EPA REGION V
WORKING PAPER No, 137
WITH THE COOPERATION OF THE
MINNESOTA POLLUTION CONTROL AGENCY
AND THE
MINNESOTA NATIONAL GUARD
JULY, 1975
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1
CONT ENTS
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 5
III. Lake Water Quality Summary 6
IV. Nutrient Loadings 10
V. Literature Reviewed 15
VI. Appendices 16
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11
FOREWORD
The National Eutrophication Survey was initiated in 1972 in
response to an Administration conimitment to investigate the nation-
wide threat of accelerated eutrophication to fresh water lakes and
reservoi 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 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 1ake, 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 ofi ke 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 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.
AC KNOWLEDGMENT
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 Home Dieu Douglas
Lily Blue Earth
Little Grant
Lost St. Louis
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V
LAKE NAME COUNTY
Madison Blue Earth
Mal medal Pope
Mashkenode St. Louis
McQuade St. Louis
Minnetonka Hennepin
Minnewaska Pope
Mud Itasca
Nest Kandlyohi
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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____ WA•ASHA Co .
OLM$rEc, co
:‘-‘
..—..
I
vi
ZUMBRO LAKE
x Lake Sampling Site
/
— . .
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Map Location.
ZUMBRO LAKE
Lake Sampling Site
Tributary Sampling Site
Sewage Treatment Facility
Direct Drainage Area Boundary
-j.
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ZUMBRO LAKE
STORET NO. 27A5
I. CONCLUSIONS
A. Trophic Condition:
Survey data show that Zumbro Lake is eutrophic. Of the 60
Minnesota lakes sampled in the fall of 1972 when essentially
all were well-mixed, 49 had less mean total phosphorus, 51 had
less mean dissolved phosphorus, and all had less mean inorganic
nitrogen. For all Minnesota data, 31 lakes had less mean
chlorophyll a, and 30 had a greater mean Secchi disc transparency.
Survey limnologists noted intensive algal blooms in progress
during the June and August sampling visits.
B. Rate—Limiting Nutrient:
A significant loss of nutrients occurred in the algal assay
sample between the time of collection and the beginning of the
assay, and the results are not representative of conditions in
the lake at the time the sample was taken (11/03/72). The lake
data indicate nitrogen limitation during the June and August
sampling periods and phosphorus limitation during the November
sampling.
C. Nutrient Controllability:
1. Point sources--During the sampling year, Zumbro Lake
received a total phosphorus load at a rate 52 times the rate
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2
proposed by Vollenweider (in press) as “dangerous”; i.e., a
eutrophic rate (see page 14). However, the mean hydraulic
retention time of Zumbro Lake is less than ten days, and it
is likely that Vollenweider’s model does not apply. Nonetheless,
the existing trophic condition of the lake is evidence of excessive
nutrient loads.
It is calculated that the City of Rochester and the villages
of Byron and Pine Island collectively contributed nearly 83% of
the total phosphorus load to Zumbro Lake. In the following table,
the total phosphorus loading rates that can be achieved by speci-
fied levels of phosphorus removal at all three point sources are
shown and compared to Vollenweider’s suggested rates.
Total P Loading
% P Removal lbs/acre/yr g/m 2 /yr
Existing 1,159.9 130.00
50 680.4 76.27
70 488.7 54.77
80 392.8 44.03
90 296.9 33.28
100 201.0 22.53
Voll enweider:
Eutrophic rate 2.50
Oligotrophic rate 1.25
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It will be noted that none of the removal options given
above would result in an optimal loading rate. In fact, even
with 100% removal at the point sources, the loading would be
about nine times the eutrophic rate. However, in view of the
questionable applicability of Vollenweider's model to Zumbro
Lake, it is likely that a high degree of point-source phosphorus
removal would result in persistent phosphorus limitation in the
lake and a significant reduction in the incidence and severity
of nuisance algal blooms.
Attention is called to the exceptionally large phosphorus
load measured at the Pine Island wastewater treatment plant
(equivalent to more than 15 pounds per capita per year). As
far as is known, a creamery is the only industrial nutrient
source contributing to the treatment plant (Schilling, 1974).
Further study is needed to identify the source of this excess
phosphorus.
2. Non-point sources—The mean phosphorus export rate of
2
the Zumbro Lake tributaries was 93 Ibs/mi /yr and ranged from
91 pounds to 95 pounds (see page 14). The export rates compare
very well with the mean export of tributaries to nearby Lake
Pepin* (154 Ibs/mi2/yr).
* Working Paper No. 119.
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4
In all, it is calculated that non-point sources, excluding
precipitation, contributed about 17% of the total phosphorus
load to Zumbro Lake during the Survey sampling year.
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5
II. LAKE AND DRAINAGE BASIN CHARACTERISTICS
A. Lake Morphometryt:
1. Surface area:
2. Mean depth: 1
3. Maximum depth:
4. Volume: 3,910
5. Mean hydraulic
B. Tributary and Outlet:
(See Appendix A for flow data)
1. Tributaries —
Name
S. Fork, Zumbro River
Middle Fork, Zumbro River
Dry Run Creek
Minor tributaries &
imediate drainage -
Totals
391 acres.
0 feet.
48 feet.
acre-feet.
retention time: 6.5 days.
Drainage area*
365.0 mi 2
441.0 mi
29.0 mi
16.4 mi 2
851.4 mi 2
Mean flow*
131.5 cfs
154.8 cfs
9.5 cfs
6.4 cfs
302.2 cfs
2. Outlet -
Zumbro River 852.0 mi 2 ** 302.2 cfs**
C. Precipitation***:
1. Year of sampling: 36.6 inches.
2. Mean annual 28.5 inches.
t McGuire, 1973.
* Drainage areas are accurate within ±5%; mean daily flows are accurate
within ±10%; and ungaged flows ar accurate within ±10 to 25% for
drainage areas greater than 10 mit.
** Includes area of lake; outflow adjusted to equal sum of inflows.
See Working Paper No. 1, “Survey Methods, 1972”.
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6
III. LAKE WATER QUALITY SUMMARY
Zumbro 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 two
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 two 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 sta-
tions for chlorophyll a analysis. The maximum depths sampled were 30
feet at station 1 and 40 feet at station 2.
The results obtained are presented in full in Appendix B and the
data for the fall sampling period, when the lake essentially was well-
mixed, are summarized 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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7
A. Physical and chemical characteristics:
FALL VALUES
(11/03/72)
Parameter Minimum Mean Median Maximum
Temperature (Cent.) 6.6 6.8 6.9 7.0
Dissolved oxygen (mg/i) 9.0 9.5 9.4 10.0
Conductivity ( mhos) 570 578 570 600
pH (units) 7.5 7.6 7.6 7.8
Alkalinity (mg/i) 160 186 183 232
Total P (mg/i) 0.300 0.311 0.310 0.329
Dissolved P (mg/i) 0.254 0.268 0.265 0.280
NO + NO (mg/i) 4.940 5.380 5.305 6.250
Am onia mg/1) 0.250 0.372 0.420 0.440
ALL VALUES
Secchi disc (inches) 10 59 44 118
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8
B. Biological characteristics:
1. Phytoplankton -
Sampling Dominant Number
Date Genera per ml
06/28/72 1 . Anabaena 8,840
2. Melosira 688
3. Stephanodiscus 652
4. Dinobryon 652
5. Cryptomonas 362
Other genera 1 ,089
Total 12,283
08/27/72 1 . Mel osira 1 ,474
2. Stephanodiscus 271
3. Flagellates 126
4. Anabaena 108
5. Navicula 72
Other genera 426
Total 2,477
11/03/72 1. Cylindrocystis 4,171
2. Flagellates 1,407
3. Anabaena 754
4. Dinobryon 754
5. Microcystis 603
Other genera 3,668
Total 11 ,357
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/l )
06/28/72 01 38.6
02 25.1
08/27/72 01 0.5
02 6.0
11/03/72 01 2.6
02 2.0
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9
C. Limiting Nutrient Study:
A 53% loss of dissolved phosphorus occurred in the algal
assay sample between the time of collection and the beginning
of the assay, and the results are not representative of condi-
tions in the lake at the time the sample was taken (11/03/72).
The lake data indicate nitrogen limitation during the June and
August sampling periods (N/P ratios were 5/1) and phosphorus
limitation during the November sampling (N/P = 21/1).
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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 vii), except for the high runoff
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 tribu-
tary sites nearest the lake.
In this report, nutrient loads for sampled tributaries were calcu-
lated using mean concentrations at unimpacted sampling stations (e.g.,
stations D-3, F-i, E—2, and G-l) and the mean flows. Nutrient loadings
for unsampled “minor tributaries and immediate drainage” (“ZZ” of U.S.G.S.)
were estimated by using the nutrient loads, in lbs/m1 2 /year, in Dry Run
Creek at station G-1 and multiplying by the ZZ area in mi 2 .
The operators of the wastewater treatment plants at the City of
Rochester and the villages of Byron and Pine Island provided monthly
effluent samples and corresponding flow data. Nutrient loadings for the
Village of Oronoco were estimated as septic tank loads.
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2. Known industrial** -
Name
?Creaniery
Treatment
Pine Island SIP
Mean
Flow (mgd )
0.230
Receiving
Water
Middle Fk.,
Zumbro River
A. Waste Sources:
1. Known municipal* -
Name
Pop.
Served
Treatment
Mean
Flow (mgd)
Receiving
Water
Rochester
Pine Island
53,766
1,640
trickling
filter
act. sludge
8.714
0.469
S. Fk.,
Zumbro
Middle
Zumbro
River
Fk.,
River
Byron
1,419
act. sludge
0.175
Middle
Zumbro
Fk.,
River
Oronoco
564
septic tanks
unknown
Middle
Zumbro
Fk.,
River
* Anonymous, 1974.
Schilling, 1974.
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B. Annual Total Phosphorus Loading - Average Year:
1 . Inputs -
lbsP/ %of
Source yr total
a. Tributaries (non-point load) -
S. Fk., Zumbro River 34,120 7.5
Middle Fk., Zumbro River 39,970 8.8
Dry Run Creek 2,750 0.6
b. Minor tributaries & immediate
drainage (non-point load) - 1,560 0.3
c. Known municipal STP’s -
Rochester 345,930 76.3
Pine Island 25,000 5.5
Byron 3,980 0.9
d. Septic tanks* - 140 <0.1
e. Known industrial —
Creamery (to Pine Island STP) -
f. Direct precipitation** - 60 < 0.1
Total 453,510 100.0
2. Outputs -
Lake outlet - Zumbro River 200,490
3. Net annual P accumulation - 253,020 pounds
Estimate based on a population of 564 at Oronoco; see Working Paper
No. 1.
** See Working Paper No. 1.
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C. Annual Total Nitrogen Loading - Average Year:
1. Inputs -
lbs N I % of
Source yr total
a. Tributaries (non—point load) -
S. 1k., Zumbro River 1,051,880 33.9
Middle Fk., Zumbro River 1,411,540 45.6
Dry Run Creek 68,280 2.2
b. Minor tributaries & immediate
drainage (non—point load) - 38,610 1.2
c. Known municipal -
Rochester 500,340 16.2
Pine Island 5,570 0.2
Byron 10,540 0.4
d. Septic tanks* - 5,300 0.2
e. Known industrial -
Creamery (to Pine Island STP) - -
f. Direct precipitation** - 3,770 0.1
Total 3,095,830 100.0
2. Outputs -
Lake outlet - Zumbro River 2,927,600
3. Net annual N accumulation — 168,230 pounds
* Estimate based on a population of 564 at Oronoco; see Working Paper
No. 1.
** See Working Paper No. 1.
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Vollenweider loading rates for phosphorus
(g/m 2 /yr) based on mean depth and mean
hydraulic retention time of Zumbro Lake:
“Dangerous” (eutrophic rate) 2.50
“Permissible” (oligotrophic rate) 1.25
D.
Mean Annual Non-point Nutrient Export by Subdrainage Area:
Tributary lbs P/mi 2 /yr lbs N/mi 2 /yr
S. Fk., Zumbro River 93 2,882
Middle Fk., Zumbro River 91 3,201
Dry Run Creek 95 2,354
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 nor-
phometry permitted. A mesotrophic rate would be considered one
between “dangerous” and “permissi ble”.
Note that Vollenweider’s model may not be applicable to
water bodies with short hydraulic retention times.
Total Phosphorus Total Nitrogen
Units Total Accumulated Total Accumulated
lbs/acr /yr 1,159.9 647.1 7,917.7 430.3
grams/m’/yr 130.00 72.53 887.5 48.2
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V. LITERATURE REVIEWED
Anonymous, 1974. Wastewater disposal facilities inventory. MPCA,
Minneapolis.
McGuire, John F., 1973. Personal communication (lake morphometry).
MPCA, Minneapolis.
Schilling, Joel, 1974. Personal communication (lake map; industrial
wastes). MPCA, Minneapolis.
Vollenweider, Richard A. (in press). Input-output models. Schweiz.
Z. Hydrol.
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VI. APPENDICES
APPENDIX A
TRIBUTARY FLOW DATA
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1U1. lJ1A V LOn’ TSs 4 FO MaTLUN (i 1NNFSOT4 10/30/74
LA(E C0l)E 7A5 7tIM U) LAKE
TOTAL DRAINAGE AREA (iF LAKE R52.O0
SUB—DRAINAGE NORMALIZED FLOWS
TRIBUTARY AREA JAN FEP MAR AP ( MAY JUN JUL AUG SEP OCT NOV DEC MEAN
2745A1 852.00 110.50 163.00 721.10 701.80 379.50 462.30 269.90 209.10 159.30 158.40 147.40 132.60 301.65
27A5 01 365.00 42.50 61.70 303.00 312.00 174.00 217.00 121.00 86.20 68.80 71.40 63.40 54.30 131.47
27A5E1 441.00 45.90 69.10 366.00 3B2.00 205.00 256.00 140.00 99.70 75.60 81.80 73.20 61.00 154.85
27A5G1 29.00 2.41 2.96 21.10 21.90 13.30 17.70 9.66 5.72 5.98 4.96 3.88 3.66 9.46
27A5ZZ 17.10 2.52 3.26 12.40 12.40 R.62 10.40 6.39 4.56 4.58 4.14 3.17 3.58 6.35
SUMMARY
TOTAL DRAINAGE AREA OF LAKE = 852.00 TOTAL FLOW IN = 3619.85
SUM OF SUB—DRAINAGE AREAS 852.10 TOTAL FLOW OUT = 3614.90
MEAN MONTHLY FLOWS AND DAILY FLOWS
TRIBUTARY MONTH YEAR MEAN FLOW DAY FLOW DAY FLOW DAY FLOW
?7A SA1 10 72 513.00 15 282.00
11 72 540.00 5 702.00
12 72 436.00 3 266.00
1 73 828.00
2 73 320.00 4 397.00
3 73 2540.00 4 4140.00
4 73 1890.00 8 794.00 20 2230.00
5 73 239 .00 S 2510.00 20 860.00
6 73 668.00 2 895.00
7 73 646.00 14 329.00
8 73 725.00 26 1290.00
9 73 819.00 19 286.00
27A5D1 10 72 213.00 15 117.00
11 72 214.00 5 278.00
12 72 164.00 3 100.00
1 73 293.00
2 73 112.00 4 143.00
3 73 976.flO 1590.00
4 73 774.00 325.00 20 913.00
5 73 1010.00 5 1060.00 20 364.00
6 73 289.00 2 387.00
7 73 ?84.00 14 144.00
8 73 299.00 ?f, 469.00
9 73 354.00 16 124.00
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TRIBUTARY FLO 1NFO- MATJON FO 4INNFSOTA
10/30/74
LAKE CODE 27A5 ZtJMBRO LAKE
MEAN MONTHLY FLOWS AND DAILY FLOWS
TRIBUTARY MONTH YEAI MEAN FLOW )AY FLOW DAY FLOW ThY FLOw
2745E1 10 72 ‘44.00 15 134.00
ii 7? 248.00 5 322.00
1? 72 1 4.D0 3 112.00
1 73 317.30
2 73 125.C0 4 160.00
3 73 1180.00 4 1920.00
4 73 947.(:0 8 39 .0O 20 11 ’O. OO
5 73 1190.00 5 1?50.00 20 4.00
73 340.00 2 ‘.56.00
7 73 3?9.flO 14 168.00
8 73 246.00 26 543.00
9 73 389.00 19 136.00
?7A5G1 10 72 14. 0 15 8.14
11 72 13.10 5 17.00
1 72 11.00 3 6.70
1 73 16.’ 0
2 73 5. 6 4 6.90
3 73 67.Q0 4 111.00
4 71 54.30 8 23.00 20
5 73 77.30 5 81.00 20
6 73 23.50 2 32.0’)
7 73 “.70 14 11.60
73 19.c 0 26 31.10
9 73 30.80 16 1O. 0
?7A57Z 10 7 1?.?0 15 6.70
11 7? 9.96 5 13.00
72 12.10 3 7.40
1 73 17.40
2 73 5.90 4 7.60
3 73 10.90 4 65.00
4 73 30.P0 8 13.00 20 36.00
5 73 50.10 5 53.Ou 20 18.00
6 73 13.PO 2 1 . .00
7 71 ic.oo 1 ’. 7.65
8 73 15.8’) 26 24.8)
9 73 ‘3.60 16
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APPENDIX B
PHYSICAL and CHEMICAL DATA
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STORET RETRIEVAL DATE 74/10/30
27A501
44 40 00.0 093 10 00.0
ZUMBRO LAKE
27 MINNESOTA
1IEPALES 2111202
6 0030 FEET DEPTH
00010 00300 00077 00094 00400 00410 00630 00610 00665 00666
DATE TIME DEPTH WATER DO TRANSP C JDIJCTVY PH 1 ALK NO2 .NO3 NH3—N PHOS—TOT PHOS—DIS
FROM OF TEMP SECCHI FIELD CACO3 N—TOTAL TOTAL
TO DAY FEET CENT PIG/L INCHES MICROMMO SU MG/L MG/L MG/L MG/L P MG/L P
72/06/29 14 30 0000 23.7 18.0 48 420 8.40 208 1.200 0.050 0.214 0.167
14 30 0015 ?0.5 19.0
14 30 0030 16.3 0.4 520 7.39 262 0.880 1.700 0.710 0.694
72/08/27 14 30 0000 118 510 8.05 200 1.420 0.750 0.393 0.384
14 30 0004 ?2.6 5.6 580 8.10 220 1.740 0.710 0.417 0.398
14 30 0015 21.9 1.4 599 7.60 205 1.300 1.060 0.660 0.630
14 30 0022 21.3 1.5 599 7.60 238 1.630 1.230 0.660 0.620
14 30 0029 19.4 3.6 610 7.50 238 1.250 1.530 1.010 0.910
72/11/03 11 40 0000 10 580 7.80 216 4.940 0.250 0.309 0.265
11 40 0004 6.6 10.0 570 7.80 192 5.120 0.250 0.320 0.254
11 40 0018 6.7 10.0 600 7.80 232 5.540 0.360 0.321 0.280
32217
DATE TIME DEPTH CHLPPHYL
FROM OF A
TO DAY FEET UG/L
72/06/2q 14 30 0000 38.6J
72/08/27 14 30 0000 0. SJ
7?/11/03 11 40 0000 2.6J
J VALUE KNOWN TO RE IN ERROR
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STO ET RETRIEVAL DAIF 74/10/30
27 A 502
44 40 00.0 093 10 00.0
ZtJM RO LAKE
27 MINNESOTA
1IEPALES 2111202
6 0022 FEET DEPTH
00010 00300 00077 00094 00400 00410 00630 00610 00665 00666
DATE TIME DEPTH WATER DO TRANSP CNDUCTVY PH T ALK NO2&N03 NH3—N PHOS—TOT PHOS—DIS
FROM OF TEMP SECCHI FIELD CACO3 N—TOTAL TOTAL
TO DAY FEET CENT MG/L INCHES MICROMNO SD MG/L MG/L MG/L MG/L P MG/L P
7?/06/28 14 55 0000 23.0 16.2 40 450 8.35 224 1.200 0.040 0.266 0.228
14 55 0020 20.8 4.7 520 7.72 254 1.200 0.690 0.490 0.414
72/08/27 14 10 0000 118 560 7.85 170 1.410 0.870 0.410 0.409
14 10 0004 ‘2.5 4.4 550 7.85 200 1.540 0.870 0.424 0.381
14 10 0015 21.9 2.7 590 7.75 200 1.420 0.990 0.540 0.488
14 10 0022 21.6 1.4 600 7.60 200 1.400 0.020 0.590 0.520
14 10 0030 19.2 2.1 600 7.50 245 1.640 0.020 0.660 0.253
7?/11/03 11 15 0000 20 570 7.60 186 6.250 0.420 0.311 0.280
11 15 0004 6.9 9.4 570 7.60 180 5.410 0.420 0.300 0.267
11 15 0015 6.9 .4 570 7.60 160 5.170 0.420 0.329 0.266
11 15 0025 6.9 9.4 570 7.50 160 5.400 0.420 0.301 0.265
11 15 0040 7.0 9.0 590 7.50 160 5.210 0.440 0.301 0.265
3?217
DATE TIME DEPTH CHLRPHYL
FROM OF A
TO DAY FEET UG/L
7?/06/28 14 55 0000 ?5. 1J
7?/08/27 14 10 0000 6.OJ
7?/fl/03 11 15 0000 2.OJ
J VALUE KNOWN TO HE IN ERROR
-------
APPENDIX C
TRIBUTARY and WASTEWATER
TREATMENT PLANT DATA
-------
STORET RETRIEVAL DATE 74/10/30
2745A1 LS2745A1
44 14 00.0 09? 29 00.0
ZUMBRO RIVER
27 15 ROCHESTER
0/ZUMbRO LAKE
Co HWY 7 W DG ABOUT .5 MI NZUMBRO LK OTL
11EPALES 2111204
0000 FEET DEPTH
00630 00625 00610 00671 00665
DATE TIME DEPTH N02&N03 TOT KJEL N 13—N PHOS—DIS PHOS—TOT
FROM OF N—TOTAL N TOTAL ORT’-40
TO DAY FEET MG/L MG/L MG/L MG/L P MG/L P
7?/I0/15 10 10 3.?00 0.850 0.25? 0.250 0.310
72/11/05 10 15 3.400 1.260 0.170 0.180 0.300
7?/12/03 10 25 5.000 0.180 0.180 0.260 0.300
71/01/07 13 50 3.600 1.000 0.440 0.520 0.590
73/0?/04 10 45 3.200 1.?00 0.570 0.400 0.440
73/03/04 10 00 3.200 1.700 0.640 0.580 0.630
73/04/08 10 35 4.400 1.500 0.210 0.210 0.250
73/04/20 08 ?5 5.000 3.000 0.600 0.13? 0.260
73/05/05 08 50 ‘..600 1.’,00 0.105 0.130 0.260
73/05/20 09 40 4.900 0.250 0.110 0.160 0.200
73/06/02 11 45 3.000 1.400 0.15? 0.123 0.220
73/07/14 11 35 2.400 2.100 0.252 0.210 0.270
73/08/26 11 00 1.880 1.470 0.190 0.260 0.350
73/09/16 09 25 2.900 0.710 0.110 0.300 0.340
-------
STOPET RETRIEVAL DATE 74/10/30
?7A501 LS27A5D1
+4 08 00.0 09? 27 30.0
S FORK ZUM RO R1VEI
27 15 ROCHESTER
I/?UMt3PO LAKE
Co HwY 21 R’ OG S M N ‘ OCHESTEP
IIEPALES 2111204
4 0000 FEET DEPTH
00630 00625 00610 00671 00665
OATE TIME DEPTH NO?&N03 TOT KJEL NH3—N PhOS—DIS PHOS-TOT
FROM OF N—TOTAL N TOTAL ORTHO
TO DAY FEET MG/L ‘1C /L M(/L MG/L P MG/L P
72/10/15 09 10 3.000 1.500 0.540 1.020
72/11/05 09 45 3.800 1.050 0.230 0.310 0.430
7?/1?/03 09 55 4.700 0.720 0.950 1.040
73/02/04 10 70 1.700 0.760 0.520 0.850 0.915
73/03/04 09 30 1.760 p.500 2.500 0.520 0.945
73/04/08 10 10 3.300 1.?60 0.350 0.530 0.610
73/04/20 08 05 4.200 1.950 0.?20 0.?30 0.320
73/05/05 08 30 4.500 1.000 0.120 0.190 0.280
73/05/20 09 10 4.100 0.600 0.273 0.470 0.525
73/06/02 11 25 4.000 2.310 0.200 0.370 0.470
73/07/14 11 O 3.800 ?.400 0.310 0.710 0.920
71/08/76 10 05 3.000 1.470 0.??0 0.330 0.440
71/09/16 09 05 3.900 1.150 0.?97 0.960 1.050
-------
STORET RETRIEVAL DATE 74/10/30
27A5D2 LS27A5D2
44 06 30.0 092 27 00.0
SOUTH FONK ZUMBRO RIVER
27 15 ROCHESTER
T/ZUMBRO LAKE
CO HWY 14 BROG 2.5 MI W OF RINGE
I1EPALES 2111204
4 0000 FEET DEPTH
00630 00625 00610 00671 00665
DATE TIME DEPTH NO?&N03 TOT KJEL NH3—N PHOS—DIS PHOS—TOT
FROM OF N—TOTAL N TOTAL ORTHO
TO DAY FEET MG/L MG/L MG/I MG/L P MG/L P
7?/10/15 09 15 2.300 2.900 0.530 0.130 0.870
7?/1J/05 09 30 3.300 1.000 0.220 0.260 0.359
7?/l2/03 09 45 4.700 0.540 0.680 0.850 0.940
73/01/07 13 15 4.300 0.780 0.322 0.500 0.560
73/02/04 10 00 3.700 0.930 0.410 0.710 0.750
73/03/04 09 30 1.740 6.100 1.680 0.500 0.900
73/04/05 09 55 3.300 1.470 0.370 0.560 0.660
73/04/20 07 55 4.400 1.350 0.300 0.200 0.280
73/05/05 08 20 4.600 0.500 0.105 0.159 0.280
71/05/20 09 00 4.100 1.760 0.252 0.390 0.450
71/06/02 11 05 4.000 1.700 0.198 0.370 0.470
73/07/14 10 55 3.700 2.300 0.245 0.595 0.760
73/08/26 09 50 3.000 1.600 0.220 0.320 0.440
73/09/16 08 50 3.800 0.690 0.273 0.750 0.830
-------
STORET PETRIEVAL DATE 74/10/30
77A5D3 LS27A5 03
+4 02 30.0 092 28 00.0
SOUTH FORK LUMBRO RIVER
27 15 POCHESTE
T/ZUMBPO LAKE
Co HwY 2 BROG N POCI-,ESTER ABV STP
1 1EPALES 2111204
4 0000 FEET DEPTH
0063J 006?5 00610 00671 00665
r)ATE TIME DFPTH NO7 NO3 TOT KJEL NH3—N PHOSDIS PHOS—TOT
FROM OF N-TOTAL N TOTAL ORTHO
TO DAY FEET MG/L ‘16/1 MG/L MG/L P MG/L ?
7?/10/14 11 00 0.065 0.700 0.064 0.052 0.092
7?/11/05 09 05 4.000 O.M4 0 0.066 0.066 0.126
7?/l?/03 09 30 4.400 0.100K 0.09? 0.038 0.0R5
71/01/07 13 00 4.200 0.310 0.100 0.050 0.090
71/02/04 09 50 3.500 0.350 0.075 0.035 0.085
71/03/0” 0 00 1.700 6.200 1.680 0.430 0.760
71/04/OR 09 50 3.200 1.150 0.031 0.024 0.045
71/04/20 07 45 5. lc,0 1.3E 0 0.063 0.048 0.105
73/05/05 03 05 4.600 0.540 0.0 52 0.054 0.110
73/05/?0 OR 40 3.900 0.230 0.027 0.031 0.060
71/06/0? 10 50 3.900 0.440 0.023 0.032 0.065
73/07/14 10 35 3.000 1.470 0.154 0.092 0.155
73/OR/26 09 30 :1.000 1.700 0.091 0.092 0.165
71/09/16 OR ‘0 3.300 0.675 0.063 0.058 0.1?0
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
STORET RETRIEVAL DATE 74/10/30
27A5E1 LS27A5E1
44 10 00.0 092 32 00.0
MIDDLE FORK ZUMBRO RIVER
27 7.5 ORONOCO
T/ZUMBRO LAKE
Co HWY 18 RDG AT ORONOCO
11EPALES 2111204
4 0000 FEET DEPTH
00630 00625 00610 00671 00665
DATE TIME DEPTH N02&N03 TOT KJEL NH3—N PHOS—DIS PHOS—TOT
FROM OF N—TOTAL N TOTAL ORTrIO
TO DAY FEET MG/L MG/L MG/L MG/L P MG/L P
72/10/15 11 00 1.240 0.100K 0.096 0.130 0.189
72/Il/OS 10 50 4.500 0.170 0.113 0.093 0.168
72/12/03 10 50 6.100 0.100K 0.063 0.115 0.132
73/02/04 11 15 3.500 0.270 0.160 0.126 0.145
73/03/04 10 35 2.200 7.400 2.300 0.650 1.050
73/04/08 11 00 5.500 0.670 0.023 0.063 0.085
73/04/20 08 40 7.000 2.400 0.110 0.075 0.135
73/05/05 09 15 7.300 0.100K 0.031 0.078 0.160
73/05/20 10 05 4.700 0.610 0.046 0.050 0.110
73/06/02 12 10 4.400 0.750 0.025 0.058 0.118
73/07/14 12 05 1.880 1.950 . 0.220 0.132 0.230
73/08/26 11 35 5.200 1.470 0.088 0.147 0.260
73/09/16 09 55 2.700 1.680 0.085 0.105 0.160
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
STORET RETRIEVAL DATE 74/10/30
?7A5E? LS27A5E2
44 12 00.0 09? 38 30.0
MIDDLE FORK ?UMBRO RIVER
27 7.5 PINE ISLAND
T/7UMI3RO LAKE
() HRDG SE PINE IS & A 3OVE STP
1 IEPALES 2111204
4 0000 FEET DEPTH
00630 00625 00610 00671 00665
DATE TIME DEPTH N02&N03 TOT KJEL NH3-N PHOS—DIS PHOS-TOT
FROM OF N—TOTAL N TOTAL ORTHO
TO DAY FEET MG/L IG/L MG/L MG/L P MG/L P
72/10/15 11 40 1.420 0.100K 0.048 0.045 0.069
72/11/05 11 30 4.500 0.452 0.037 0.056 0.120
7?/i2/03 11 15 7.580 0.100K 0.019 0.031 0.044
73/03/04 11 05 ‘.300 7.350 2.900 0.560 0.H80
73/04/08 11 25 6.900 0.100K 0.010 0.019 0.025
73/04/20 09 10 8.600 2.520 0.120 0.042 0.090
73/05/05 09 40 9.600 0.150 0.030 0.060 0.145
73/05/20 11 00 5.800 0.420 0.009 0.019 0.040
73/06/0? 13 10 S.600 0.PM0 0.022 0.015 0.040
71/07/14 13 25 2.100 3.700 0.105 0.063 0.085
73/08/26 13 10 8.300 2.700 0.300 0.091 0.145
73/09/16 10 30 2.700 1.380 0.064 0.037 0.045
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
STOPET RETRIEVAL )AT 74/10/30
27A5E3 LS27A5E3
44 10 00.0 092 34 00.0
MIDDLE FORK ZUMBRO RIVER
27 7.5 ORONOCO
T/LUMBRO LAKE
e O BRDG UPSTRM US 52 8RDG WORONOCO
11EPALES 2111204
4 0000 FEET DEPTH
00630 00625 00610 00671 00665
DATE TIME DE 1H NO?F NO3 TOT KJEL NH3-N PHOS—DIS PFIOS—TOT
FPO’i OF N—TOTAL N TOTAL ORTHO
TO DAY FEET MG/L 4G/L M(i/L MG/L P MG/L P
7?/10/1c 11 70 1.200 0.420 0.082 0.140 0.180
72/11/OS 11 10 1.M00 O.?70 0.071 0.084 0.176
7?/1?/03 11 00 .10O 0.100K 0.021 0.132 0.154
71/02/04 11 25 3.600 0.? 30 0.091 0.132 0.160
71/01/04 10 45 ?.000 7.200 2.700 0.620 1.050
73/O /0 ii 10 .7OO 0 . 00 0.018 0.060 0.087
73/04/20 O 55 p.700 1.540 0.100 0.042 0.170
73/05/05 09 ‘5 7.700 1.100 3.032 0.084 0.192
73/05/20 10 25 4.600 0.100K 0.011 0.060 0.095
71/06/0? 12 25 4. 0O 0.140 0.012 0.078 0.125
73/ )7/1 1 0 2.200 ?.400 0.105 0.180 0.270
71/0 /26 1 00 6.500 1.940 0.131 0.147 0.250
71/09/16 10 15 2.600 0.440 0.160 O.?60 0.290
K VALUE VNOWN TO E LESS
THAN INDICATED
-------
STORET RETRIEVAL DATE 74/10/30
?7A5F1 LS?7A5F1
44 02 30.0 092 39 00.0
UNNAMED STi EAt 4 TRIP TO ZUMBRO RV
27 7.5 BYRON
T/7UMBRO LAKE
CO H Y 5 BROG N BYRON AROVFSTP
11EPALES 2111204
4 0000 FEET DEPTH
00630 00625 00610 00671 00665
DATE TIME DEPTH N02&N03 TOT KJEL NH3-r J PHOS—DIS PHOS—TOT
FROM OF N—TOTAL N TOTAL ORTHO
TO DAY FEET MG/L MG/L MG/L MG/L P MG/L P
7?/10/15 12 15 0.585 0.450 0.075 0.054 0.082
72/11/05 09 20 0.470 0.380 0.042 0.061 0.075
72/12/03 10 15 1.660 0.100K 0.014 0.034 0.045
73/03/04 12 15 0.890 3.990 0.780 0.198 0.290
73/04/OR 12 30 1.360 1.260 0.03b 0.032 0.035
73/04/20 09 45 0.378 1.980 0.068 0.056 0.?55
73/05/05 10 10 0.450 0.380 0.014 0.041 0.070
73/05/20 11 35 0.770 2.100 0.025 0.035 0.095
73/06/02 13 40 0.740 1.900 0.037 0.048 0.105
73/07/14 14 05 1.760 1.200 0.023 0.056 0.240
71/08/26 14 05 0.840 0.600 0.029 0.066 0.070
73/09/16 12 00 1.000 1.380 0.044 0.069 0.0 5
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
STO :T FT !FVAL flATs 74/10/30
?7A5F2 LS27A SF2
44 03 30.0 09? 38 30.0
UNNAMEE) STRM TRIB TO ZUMBRO RV
7.5 BYRON
T/ZUMBRO LAI
-------
STORET RETRIEVAL DATE 74/10/30
27A5G1 LS27A5G1
44 11 30.0 092 30 00.0
DRY RUN CREEK
27 7.5 ORONOCO
T/ZUMBRO LAKE
Co HWY 127 BRDG 2 MI NE OF ORONOCO
11EPALES 2111204
4 0000 FEET DEPTH
00630 00625 00610 00671 00665
DATE TIME DEPTH N02&N03 TOT KJEL NH3—N PHOS—DIS PHOS-TOT
FROM OF N—TOTAL N TOTAL ORTHO
TO DAY FEET MG/L MG/L MG/L MG/L P MG/L P
72/10/15 10 40 0.560 0.100K 0.050 0.044 0.046
72/11/05 10 30 2.160 0.730 0.066 0.092 0. 52
72/12/03 10 35 1.300 0.100K 0.005K 0.037 0.044
13/01/07 14 05 2.800 0.022 0.049 0.060
73/02/04 11 00 2.700 0.100K 0.015 0.031 0.035
73/03/04 10 15 1.800 7.500 2.800 0.780 1.000
73/04/08 10 50 2.200 1.050 0.017 0.046 0.063
73/04/20 08 35 2.900 2.250 0.058 0.054 0.065
73/05/05 09 05 3.700 0.320 0.018 0.075 0.090
73/05/20 09 50 2.700 0.140 0.013 0.043 0.065
73/06/02 12 00 2.500 2.000 0.033 0.051 0.080
73/07/14 11 55 2.800 1.150 0.043 0.037 0.050
73/08/26 11 20 2.600 0.100K 0.040 0.074 0.085
73/09/16 09 40 3.100 0.900 0.038 0.110 0.220
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
STOPET RETRIEVAL DATE 74/10/30
274551 AS27A551 P053766
44 04 00.0 092 28 00.0
ROCHESTER
27 15 ROCHESTER
T/ZIJMBRO LAKE
S FORK ZUMBRO
IIEPALES 2141204
4 0000 FEET DEPTH
00630 006? 5 00610 00671 00665 50051 50053
DATE TIME DEPTH NO? .NO3 TOT KJEL NH3—N PI-sOS—DIS PHOS—TOT FLOW CONDUIT
FROM OF N—TOTAL N TOTAL ORTHO RATE FLOW—MGD
TO DAY FEET MG/L AG/L MG/L MG/L P MG/L P INST MGD MONTHLY
73/01/25 OR 00
CP(T)— 4.600 13.000 2.600 10.400 12.600 8.540 8.240
73/01/26 08 00
73/02/27 08 00
CPT)— 3.300 16.400 4.100 14.000 14.000 8.420 8.080
73/0?/? 08 00
73/03/2P OR 00
CP(T)— 1.900 19.000 5.900 14.000 14.500 6.120 9.580
73/03/29 08 00
73/04/29 OR 00
CP(T)— 3.800 1S.( 00 2.300 7.715 13.500 8.390 8.670
73/04/30 08 00
73/07/04 OR 00
CP(T)— 4.500 11.000 0.320 10.400 11.000 7.350 9.020
73/07/OS OR 00
73/OR/14 OR 00
CP(T)— 2.500 13.200 0.770 6.200 9.900 9.040 8.340
73/OR/IS OR 00
73/09/13 08 00
CP(T)— 5.200 13.ROO 3.280 13.200 13.600 8.850 9.320
73/09/14 08 00
73/10/15 OR 00
CP(T)— 4.900 15.000 4.450 5.300 10.500 12.600 9.280
73/10/16 OP 00
73/1 1/14 08 00
CP(T)— ?.800 17.000 3.900 9.200 14.000 9.280 8.820
71/Il/iS 08 00
71/1 2/I’ OR 00
CP(T)— 1.680 19.500 5.850 9.800 16.500 7.790 8.500
73/12/15 08 00
74/O?/?7 24 00
O.6U0 18.500 4.400 10.500 15.000 8.230 8.000
74/07/28 24 00
74/08/06 08 00
CD(T)— 3.840 13.000 0.790 5.200 11.500 8.810 8.000
74/08/07 08 (10
-------
STORET PETpIEV I DATE 7 /10/3Q
?7A552 AS?7A55? P001419
44 02 30.0 09? 39 00.0
HYRON
27 7.5 F yRON
T/ZUME3RO LAi(F
UNNAMED STREAM
1 1EPALES 2141204
4 0000 FEET DEPTH
50051 50053
FLOW CONDUIT
RATE FLOW—MGO
INST MOD MONTHLY
00630
00625
00610
00671
00665
DATE
TIME
DEPTH
N02SN03
TOT KJEL
NH3-N
PHOS-DIS
P 1-lOS-TOT
FROM
OF
N—TOTAL
N
TOTAL
ORTHO
TO
DAY
FEET
MG/L
‘iG/L
MG/L
MG/L P
MG/L P
73/01/31
11 00
CPU)—
0.060
23.000
8.540
6.360
7.800
0.150
73/91/31
13 00
73/03/09
11 00
CP(T)—
0.090
20.500
5.PO0
6.400
7.500
0.160
0.150
73/03/09
13 00
73/03/30
11 00
CP(T)—
2.300
23.100
4.500
3.550
7.250
0.150
0.160
73/03/30
13 00
73/04/27
11 00
CP(T)—
2.600
17.700
1.630
2.700
7.100
0.180
0.170
73/04/27
13 00
73/06/05
11 00
CP(T)—
2.200
15.000
1.100
2.200
0.180
0.200
73/06/05
13 00
73/06/29
11 00
CP(T)—
0.220
16.800
5.300
4.500
6.700
0.165
0.170
73/06/29
13 00
73/08/01
11 00
CPU)—
0.150
19.800
4.450
3.150
8.000
0.170
0.175
73/98/01
13 00
73/08/31
11 00
CP(T)—
18.900
2.700
6.520
8.050
0.200
0.180
73/08/31
13 00
73/10/01
11 00
CP(T)—
0.030
14.000
2.600
3.000
7.400
0.200
0.180
73/10/01
13 00
73/11/01
11 00
CP(T)—
0.100
25.000
5.600
4.100
9.100
0.180
0.180
73/11/01
13 00
73/11/30
11 00
CP(T)—
0.090
17.000
2.520
3.000
7.100
0.180
0.190
73/11/30
13 00
73/12/28
11 00
CP(T)—
1.600
18.500
1.200
3.360
5.000
0.170
0.180
73/12/25
13 00
------- |