U.S. ENVIRONMENTAL PROTECTION AGENCY
NATIONAL EUTROPHICATION SURVEY
WORKING PAPER SERIES
n
REPORT
ON
LAKENORIBl
HAftlN COUNTY
SOUTH DAKOTA
EPA REGION VI11
WORKING PAPER No, 61/J
CORVALLIS ENVIRONMENTAL RESEARCH LABORATORY - CORVALLIS, OREGON
and
ENVIRONMENTAL MONITORING & SUPPORT LABORATORY - LAS VEGAS, NEVADA
•&G.P.O. 699-440
-------
REPORT
ON
LAKENORDBJ
HAFtIN COIMY
SOUTH DAKOTA
EPA REGION VI11
WORKING PAPER No,
WITH THE COOPERATION OF THE
SOUTH DAKOTA DEPARTMENT OF ENVIRONMENTAL PROTECTION
AND THE
SOUTH DAKOTA NATIONAL GUARD
JANUARY/ 1977
-------
CONTENTS
Foreward ii
List of South Dakota Study Lakes iv
Lake and Drainage Area Map v
Sections
I. Conclusions 1
II. Lake and Drainage Basin Characteristics 1
III. Lake Water Quality Summary 2
IV. Nutrient Loadings 3
V. Literature Reviewed „ 7
VI. Appendices 8
-------
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 freshwater 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 [§303(e)], water
quality criteria/standards review [§303(c)], clean lakes [§314(a,b)],
and water quality monitoring [§106 and §305(b)] activities mandated
by the Federal Water Pollution Control Act Amendments of 1972.
-------
Ill
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
freshwater 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 South Dakota Departments of
Environmental Protection and Game, Fish and Parks for professional
involvement, to the South Dakota National Guard for conducting the
tributary sampling phase of the Survey, and to those wastewater
treatment plant operators who voluntarily provided effluent samples.
Allyn Lockner, Secretary, and Blaine Barker and Duane Murphy,
Department of Environmental Quality; Douglas Hansen, Department
of Game, Fish and Parks; and James Hayden, Director, State Lakes
Preservation Committee provided invaluable lake documentation and
counsel during the Survey, reviewed the preliminary reports, and
provided critiques most useful in the preparation of this Working
Paper series.
Major General Duane L. Corning, the Adjutant General of South
Dakota, and Project Officer Colonel Robert D. Chalberg, who directed
the volunteer efforts of the South Dakota National Guardsmen, are also
gratefully acknowledged for their assistance to the Survey.
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1v
NATIONAL EUTROPHICATION SURVEY
STUDY LAKES
STATE OF SOUTH DAKOTA
LAKE NAME
Albert
Alvin
Angostura
Brant
Byron
Clear
Clear
Cochrane
Cottonwood
Deerfield
Enemy Swim
Herman
John
Kampeska
Madison
Mi tchel1
Norden
East Oakwood
West Oakwood
Pactola
Pickerel
Poinsett
Red Iron South
Richmond
Roy
Sand
Sheridan
Stockdale
East Vermillion
Wall
Waubay
COUNTY
Kingsbury
Lincoln
Fall River
Lake
Beadle
Marshall
Minnehaha
Deuel
Spink
Pennington
Day
Lake
Hamlin
Codington
Lake
Davidson
Hamlin
Brookings
Brookings
Pennington
Day
Brookings,
Marshall
Brown
Marshall
Brown
Pennington
Custer
McCook
Minnehaha
Day
Lake
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S. Dak.
Map Location
Dolph
97.14
\
LAKE NORDEN
X Lake Sampling Site
97 13
97*12
97 11
44-36-
4435—
9710
-------
LAKE NORDEN
STORE! NO. 4617
I. INTRODUCTION
Lake Norden was included in the National Eutrophication Survey as
a water body of interest to the South Dakota Departments of Environ-
mental Protection and Game, Fish and Parks. Tributaries and nutrient
sources were not sampled, and this report relates only to the lake
sampling data.
II. CONCLUSIONS
A. Trophic Condition:
Survey data indicate that Lake Norden is eutrophic. It
ranked twenty-seventh in overall trophic quality when the 31
South Dakota lakes sampled in 1974 were compared using a com-
bination of six parameters*. Twenty-three of the lakes had
less median total phosphorus and median inorganic nitrogen,
18 had less median dissolved orthophosphorus and mean chloro-
phyll a_, and 26 had greater mean Secchi transparency.
Survey limnologists noted that the lake was turbid and
reported on algal bloom in progress in July.
B. Rate-Limiting Nutrient:
The algal assay results indicate Lake Norden was nitrogen
limited at the time the sample was collected (04/23/74). The
lake data indicate nitrogen limitation at the other sampling
times as well.
See Appendix A.
-------
III. LAKE AND DRAINAGE BASIN CHARACTERISTICS1"
A. Lake Morphometry :
1. Surface area: 3.02 kilometers2.
2. Mean depth: 2.1 meters.
3. Maximum depth: 4.6 meters.
4. Volume 6.342 x 106 m3.
B. Precipitation*:
1. Year of sampling: 39.1 centimeters.
2. Mean annual: 56.3 centimeters.
t Table of metric equivalents—Appendix B.
tt Murphey, 1974.
* See Working Paper No. 175, "...Survey Methods, 1973-1976",
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IV. LAKE WATER QUALITY SUMMARY
Lake Norden was sampled three times during the open-water season
of 1974 by means of a pontoon-equipped Huey helicopter. Each time,
samples for physical and chemical parameters were collected from one
or more depths at a single station on the lake (see map, page v).
During each visit, a depth-integrated (near bottom to surface)
sample was collected for phytoplankton identification and enumeration;
and a similar sample was collected for chlorophyll a_ analysis. During
the first visit, an 18.9-liter depth-integrated sample was taken for
algal assays. The maximum depth sampled was 0.9 meters.
The sampling results are presented in full in Appendix C and are
summarized in the following table.
-------
A. SUMMARY OF PHYSICAL AMU
CHEMICAL CHARACTERISTICS FOK LAK.E NO*DEN
STOrtET CODE 4617
PARAMETER
TEMP (C)
DISS OXY
CNDCTVY (MCROMO)
PH (STAND UNITS)
TOT ALK (MG/L)
TOT P (MG/D
ORTHO P (MG/L)
N02»N03 (MG/L)
AMMONIA (MG/L)
KJEL N (MG/L)
INOKG N (MG/L)
TOTAL N (MG/L)
CHLRPYL A (UO/L)
SECCHI (METERS)
1ST SAMPLING ( 4/23/74)
1 SITES
RANGE MEAN. MEDIAN
9.2 - 9.2 9.2 9.2
10.0 - 10.0 10.0 10.0
664. - 684. 684. 684.
8.3 - 8.3 8.3 8.3
183. - 183. 183. 183.
0.258 - 0.258 0.258 0.258
0.018 - 0.018 0.018 0.018
0.040 - 0.040 0.040 0.040
0.080 - 0.080 0.080 0.080
1.600 - 1.600 1.600 1.600
0.120 - 0.120 0.120 0.120
1.640 - 1.640 1.640 1.640
28.5 - 28. S 28.5 2a.b
0.3 - 0.3 0.3 0.3
2ND SAMPLING (
25.0
5.0
1511.
8.6
234.
0.255
0.083
0.060
0.150
1.800
0.210
1.870
60.6
0.3
1
ANGE
- 25.1
6.0
- 1512.
6.7
- 240.
- 0.281
- 0.096
- 0.070
- 0.170
- 2.100
- 0.230
- 2.1bO
- 60.6
0.3
SITES
MEAN
25.1
5.8
1511.
8.6
237.
0.266
0.091
0.063
0,157
1.967
0.220
2.030
60.6
0.3
7/12/74)
MEDIAN
25.1
b.8
1511.
ft. 6
236.
0.262
0.094
0.060
0.150
2.000
0.220
2.060
60.6
0.3
3RD SAMPLING < 9/19/74)
1 SITES
rtANGE MEAN MEDIAN
l/.O - 17.0 17.0 17.0
8.6 - 8.8 8.7 8.7
1426. - 1426. 1426. 1426.
8.1 - B.I 8.1 8.1
193. - 196. 195. 195.
0.161 - 0.182 0.171 0.171
0.006 - 0.007 0.006 0.006
0.020 - 0.020 0.020 0.020
0.040 - 0.040 0.040 0.040
2.200 - 2.200 2.200 2.200
0.060 - 0.060 0.060 0.060
2.220 - 2.220 2.220 2.220
51.3 - SI.3 51.3 51.3
0.3 - 0.3 0.3 0.3
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B. Biological characteristics:
1. Phytoplankton -
Sampling
Date
04/23/74
07/12/74
09/19/74
2. Chlorophyll a^ -
Sampling
Date
04/23/74
07/12/74
09/19/74
Dominant
Genera
1 . Chroomonas sp.
2. Synedra sp.
3. Ankistrodesmus sp.
4. Cryptomonas sp.
5. Melosira sp.
Other genera
Total
1. Crucigenia sp.
2. Aphanizdmehon sp.
3. Oocystis sp.
4. Chroomonas sp.
5. Cymbella sp.
Other genera
Total
1 . Melosira sp.
2. Aphanizomenon sp.
3. Chlorophytan filaments
4. Synedra sp.
5. Stephanodiscus sp.
Other genera
Total
Station
Number
1
1
1
Algal Units
per ml
30,800
9,774
1,524
1,255
1,210
2,243
46,806
10,706
1,798
1,389
1,144
1,062
3,229
19,328
7,307
2,036
1,437
898
659
4,074
16,411
Chlorophyll a
(yg/D
28.5
60.6
51.3
-------
0.040
0.090
0.090
0.040
0.108
0.108
1.108
1.108
4.7
4.3
29.5
20.9
C. Limiting Nutrient Study:
1. Autoclaved, filtered, and nutrient spiked -
Ortho P Inorganic N Maximum yield
Spike (mg/1) Cone, (mg/1) Cone, (mg/1) (mg/l-dry wt.)
Control
0.050 P
0.050 P + 1.0 N
1.0 N
2. Discussion -
The control yield of the assay alga, Selenastrum capri-
cornutum, indicates that the potential primary productivity
of Lake Norden was high at the time the assay sample was
collected (04/23/74). The increase in yield with the
addition of nitrogen alone and the lack of such response
when only orthophosphorus was added indicate nitrogen
limitation.
The lake data indicate nitrogen limitation at all
sampling times; i.e., the mean inorganic nitrogen/ortho-
phosphorus ratios were 10/1 or less, and nitrogen limitation
would be expected.
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V. LITERATURE REVIEWED
Murphey, Duane G.» 1974. Personal communication (lake morphometry),
SD Dept. of Env. Prot., Pierre.
Petri, Lester R., and L. Rodney Larson, 1966(7). Quality of water
in selected lakes of eastern South Dakota. Rept. of Inv. #1,
SD Water Res. Comm., Pierre.
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VI. APPENDICES
8
APPENDIX A
LAKE RANKINGS
-------
LAKE DATA TO BE USED IN RANKINGS
LAKE
CODE LAKE NAME
4601 LAKE ALBERT
4602 ALVIN LAKE
4603 ANGOSTURA RESERVOIR
4604 BRANT LAKE
4605 LAKE BYRON
4606 CLEAR LAKE
4607 CLEAR LAKE
4608 COCHRANE LAKE
4609 COTTONWOOO LAKE
4610 DEERFIELD RESERVOIR
4611 ENEMY SWIM LAKE
4612 LAKE HERMAN
4613 ST JOHN LAKE
4614 LAKE KAMPESKA
4615 MADISON LAKE
4616 LAKE MITCHELL
4617 LAKE NORDEN
4618 OAKWOOn LAKE EAST
4619 OAKWOOD LAKE WEST
4620 PACTOLA RESERVOIR
4621 PICKEREL LAKE
4622 LAKE POINSETT
4623 LAKE RED IRON SOUTH
4624 RICHMOND LAKE
4625 ROY LAKE
4626 SAND LAKE
4627 SHERIDAN LAKE
4628 STOCKA.DE LAKE.
MEDIAN
TOTAL P
0.321
0.067
0.019
0.194
0.443
0.027
1.400
0.037
0.685
0.033
0.037
0.340
0.348
0.220
0.250
0.099
0.256
0.146
0.181
0.011
0.049
0.115
0.042
0.187
0.034
0.489
0.053
0.233
MEDIAN
INORG N
0.170
0.970
0.160
0.130
0.370
0.075
0.270
0.150
0.265
0.080
0.085
- 0.155
0.080
0.105
0.090
0.085
0.165
0.175
0.135
0.070
0.095
0.315
0.110
0.150
0.070
0.110
0.105
0.150
500-
.MEAN SEC
489.111
442,833
423.333
432.833
488.333
430.167
495.333
446.000
490.333
303.333
442.600
485.000
489.400
468.889
445.555
465.833
488.667
487.000
485.833
248.444
439.833
468.444
430.333
410.000
431.000
471.800
394.000
432.000
MEAN
CHLORA
106.289
4.700
3.717
34.150
149.350
11.983
691.000
15.683
112.017
3.650
14.200
58.733
120.880
20.567
22.578
14.883
46.800
113.600
159.667
1.478
15.833
40.211
6.883
18.467
13.333
65.790
15.433
25.400
15-
MIN DO
9.200
9.400
13.000
11.800
9.000
8.800
7.000
15.000
8.600
15.000
8.200
8.600
9.800
8.200
14.000
13.800
10.000
10.000
9.600
11.000
9.600
10.000
7.600
10.000
11.000
12.800
15.000
15.000
MEDIAN
DISS ORTHO P
0.019
0.017
0.005
0.113
0.146
0.009
0.468
0.008
0.417
0.022
0.013
0.174
0.025
0.128
0.107
0.015
0.050
0.009
0.021
0.006
0.009
0.023
0.010
0.144
0.010
0.288
0.016
0.109
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.AKE DATA TO BE USED IN RANKINGS
.AKE
CODE LAKE NAME
4629 LAKE VERMILLION
4630 WALL LAKE
4631 WAU8AY LAKE NORTH
MEDIAN
TOTAL P
0.211
0.194
0.093
MEDIAN
INORG N
0.100
0.160
0.145
500-
MEAN SEC
472.833
441.667
469.555
MEAN
CH^ORA
100.800
55.267
127.033
15-
MIN DO
9.200
7.400
11.400
MEDIAN
DISS ORTHO
0.092
0.076
0.023
P
-------
PERCENT OF LAKES WITH HIGHER VALUES (NUMBER OF LAKES WITH HIGHER VALUES)
LAKE
CODE LAKE NAME
4601 LAKE ALBERT
4602 ALVIN LAKE
4603 ANGOSTURA RESERVOIR
4604 BRANT LAKE
4605 LAKE BYRON
4606 CLEAR LAKE
4607 CLEAR LAKE
4608 COCHRANE LAKE
4609 COTTONWOOD LAKE
4610 OEERFIELD RESERVOIR
4611 ENEMY SWIM LAKE
4612 LAKE HERMAN
4613 ST JOHN LAKE
4614 LAKE KAMPESKA
4615 MADISON LAKE
4616 LAKE MITCHELL
4617 LAKE NORDEN
4618 OAKWOOD LAKE EAST
4619 OAKWOOD LAKE WEST
4620 PACTOLA RESERVOIR
4621 PICKEREL LAKE
4622 LAKE POINSETT
4623 LAKE RED IRON SOUTH
4624 RICHMOND LAKE
4625 ROY LAKE
4626 SANO LAKE
4627 SHERIDAN LAKE
4628 STOCKADE LAKE
MEDIAN
TOTAL P
20 (
67 (
97 (
40 (
10 (
93 <
0 (
83 (
3 (
90 <
80 (
17 (
13 <
33 <
27 <
60 <
23 (
53 <
50 (
100 (
73 (
57 (
77 <
47 (
87 (
7 (
70 <
30 <
6)
20)
29)
12)
3)
28)
0)
25)
1)
27)
24)
5)
4)
10)
8)
18)
7)
16)
15)
30)
22)
17)
23)
14)
26)
2)
21)
9)
MEDIAN
INORG N
20
0
30
53
3
93
10
40
13
88
82
33
88
65
77
82
23
17
50
98
73
7
58
40
98
58
65
40
< 6)
( 0)
( 9)
( 16)
< 1)
( 28)
< 3)
< 11)
< 4)
( 26)
( 24)
< 10)
( 26)
< 19)
< 23)
( 24)
< 7)
( 5)
( 15)
i 29)
( 22)
( 2)
< 17)
( 11)
( 29)
( 17)
( 19)
( 11)
500-
MEAN SEC
10 I
57 (
87 <
70 <
17 (
83 (
0 (
50 (
3 (
97 (
60 (
27 1
7 1
40 (
53 1
47 (
13 1
20 1
23 I
100 1
67 1
43 i
60 i
90 i
77
33
93
73
: 3)
17)
; 26)
: 21)
5)
; 25>
; o)
15)
: i)
; 29)
I 16)
: e>
I 2)
[ 12)
! 16)
; 14)
[ 4)
[ 6)
I 7)
I 30)
[ 20)
t 13)
[ 24)
t 27)
( 23)
( 10)
( 26)
( 22)
MEAN
CHLORA
23
90
93
47
7
83
0
67
20
97
77
33
13
57
53
73
40
17
3
100
63
43
87
60
80
30
70
50
(
(
<
(
(
(
<
(
(
(
(
(
(
(
(
(
(
(
(
(
(
(
(
(
(
(
(
(
7)
27)
28)
14)
2)
25)
0)
20)
6)
29)
23)
10)
4)
17)
16)
22)
12)
5)
1)
30)
19)
13)
26)
18)
24)
9)
21>
15)
15-
MIN DO
68 (
63 (
20 (
27 (
73 <
77 <
100 <
5 <
82 1
5 <
68 1
82 1
53 (
88 1
13 (
17 1
45 I
45 1
58 i
35 i
58 i
45 i
93
45
35
23
5
5
: 20)
: 19)
: 6)
8)
: 22)
: 23)
: 30)
: o)
[ 24)
! 0)
I 26)
I 24)
: 16)
1 26)
I 4)
t 5)
I 12)
I 12)
I 17)
( 10)
1 17)
( 12)
( 28)
I 12)
t 10)
( 7)
( 0)
( 0)
MEDIAN
OISS ORTHO P
60 1
63 (
100 1
23 <
13 (
90 (
0 1
93 1
3 (
53 <
73 (
10 (
43 1
20 1
30 1
70 I
40 <
85 i
57 I
97 i
85 i
47 i
78
17
78
7
67
27
1 18)
I 19)
, 30)
; 7)
: 4)
1 27)
: o>
; 28)
: i)
[ 16)
I 22)
1 3)
I 13)
I 6)
[ 9)
I 21)
I 12)
t 25)
I 17)
I 29)
t 25)
( 14)
t 23)
( 5)
( 23)
( 2)
( 20)
( 8)
INDEX
NO
201
340
427
260
123
519
110
338
124
430
460
202
217
303
253
349
184
237
241
530
419
242
473
299
455
158
370
225
-------
PERCENT OF LAKES WITH HIGHER VALUES (NUMSER OF LAKES WITH HIGHER VALUES)
LAKE
CODE LAKE NAME
4639 LAKE VERMILLION
4*,30 WALL LAKE
4631 WAUBAY LAKE NORTH
MEDIAN
TOTAL P
37 (
43 (
63 (
11)
13)
19)
MEDIAN
INORG N
70
27
47
< 21)
< 8)
( 14)
500-
MEAN SEC
30 (
63 (
37 (
9)
19)
11)
MEAN
CHLORA
27
37
10
( 8)
( 11)
( 3)
15-
MIN DO
68
97
30
( 20)
( 29)
( 9)
MEDIAN
DISS ORTHO P
33 (
37 <
50 (
10)
11)
15)
INDE:
NO
265
304
237
-------
LAKES RANKED BY INDEX NOS,
RANK LAKE CODE LAKE NAME
INDEX NO
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
IB
19
20
21
22
23
24
25
26
27
28
4620
4606
4623
4611
4625
4610
4603
4621
4627
4616
4602
4608
4630
4614
4624
4629
4604
4615
4622
4619
4631
4618
4628
4613
46.12
4601
4617
4626
PACTOLA RESERVOIR
CLEAR LAKE
LAKE RED IRON SOUTH
ENEMY SWIM LAKE
ROY LAKE
DEERFIELD RESERVOIR
ANGOSTURA RESERVOIR
PICKEREL LAKE
SHERIDAN LAKE
LAKE MITCHELL
ALVIN LAKE
COCHRANE LAKE
WALL LAKE
LAKE KAMPESKA
RICHMOND LAKE
LAKE VERMILLION
BRANT LAKE
MADISON LAKE
LAKE POINSETT
OAKWOOD LAKE WEST
WAUBAY LAKE NORTH
OAKWOOD LAKE EAST
STOCKADE LAKE
ST JOHN LAKE
LAKE HERMAN
LAKE ALBERT
LAKE NOROEN
SAND LAKE
530
519
473
460
455
430
427
419
370
349
340.
338
304
303
299
265
260
253
242
241
237
237
225
217
202
201
184
158
-------
LAKES RANKED BY INDEX NOS.
RANK LAKE CODE LAKE NAME INDEX NO
39 4609 COTTONWOOD LAKE 124
30 4605 LAKE BYRON 123
31 4607 CLEAR LAKE 110
-------
APPENDIX B
CONVERSION FACTORS
-------
.CONVERSION FACTORS
Hectares x 2.471 = acres
Kilometers x 0.6214 = miles
Meters x 3.281 = feet
Cubic meters x 8.107 x 10~4 = acre/feet
Square kilometers x 0.3861 = square miles
Cubic meters/sec x 35.315 = cubic feet/sec
Centimeters x 0.3937 = inches
Kilograms x 2.205 = pounds
Kilograms/square kilometer x 5.711 = Ibs/square mile
-------
APPENDIX C
PHYSICAL and CHEMICAL DATA
-------
STOrfET RETRIEVAL DATE 75/11/25
461701
44 35 35.0 097 12 00.0
LAKE NOftOEN
46057 SOUTH DAKOTA
DATE
FROM
TO
74/04/23
74/07/12
74/09/19
TIME DEPTH
OF
DAY FEET
13 45 0000
12 40 0000
12 40 0001
12 40 0003
15 55 0000
15 55 0002
00010
WATER
TcMP
CENT
• 9.2
25,1
25.1
25.0
17.0
17.0
003CO
00
MG/L
10.0
6.6
5.0
8.8
8.6
00077 00094
TfcANSP CNDUCTVY
SECCHI FIELD
INCHES MICROMHO
10
12
12
684
1511
1511
1512
1426
1426
HEP ALES
4
00400
PH
SU
8.30
8.70
8.60
8.60
8.11
8.11
00410
T ALK
CAC03
MG/L
183
236
240
234
196
193
2111202
0006
00610
NH3-N
TOTAL
Mb/L
0.080
0.170
0.150
0.150
0.040
0.040
FEET DEPT*
00625
TOT KJEL
N
MG/L
1.600
2.100
2.000
1.800
2.200
2.200
00630
N02«.N03
N-TOTAL
MG/L
0.040
0.060
0.060
0.070
0.020K
0.020K
00671
PHOS-OIS
ORTHO
MG/L P
0.018
0.096
0.094
0.083
0.006
0.007
DATE
FROM
TO
74/04/23
74/07/12
74/09/19
TIME
OF
DAY
13
12
12
12
15
15
45
40
40
40
55
55
DEPTH
FEET
0000
0000
0001
0003
0000
0002
00665
PHOS-TOT
MG/L
0.
0.
0.
0.
0.
0.
P
258
281
262
255
161
182
32217
CHLRPHYL
A
UG/L
28
60
51
.5
.6
.3
00031
INCDT LT
REMNING
PERCENT
1.
1.
0
0
K VALUE KNOWN TO BE
LESS THAN INDICATED
------- |