U.S. ENVIRONMENTAL PROTECTION AGENCY
NATIONAL EUTROPHICATION SURVEY
WORKING PAPER SERIES
REPORT
ON
DEVILS LAKE
BEMSON AND RAMSEY COUNTIES
NORTH DAM3TA
EPA REGION VI11
WORKING PAPER No, 569
CORVALLIS ENVIRONMENTAL RESEARCH LABORATORY - CORVALLIS, OREGON
and
ENVIRONMENTAL MONITORING & SUPPORT LABORATORY - LAS VEGAS, NEVADA
699-440
-------
REPORT
ON
DEVILS LAKE
BENSON AND RAMSEY COUNTIES
NORTH DAKOTA
EPA REGION VI11
WORKING PAPER No, 569
WITH THE COOPERATION OF THE
NORTH DAKOTA STATE DEPARTMENT OF HEALTH
AND THE
NORTH DAKOTA NATIONAL GUARD
SEPTEMBER, 1376
-------
CONTENTS
Page
Foreword i i
List of North Dakota Study Lakes and Reservoirs iv
Lake and Drainage Area Map v
Sections
I. Introduction 1
II. Conclusions 1
HI. Lake Characteristics 3
IV. Lake Water Quality Summary 4
V. Literature Reviewed 8
VI. Appendices 9
-------
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.
-------
m
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 North Dakota State Depart-
ment of Health for professional involvement, to the North Dakota
National Guard for conducting the tributary sampling phase of the
Survey, and to those North Dakota wastewater treatment plant oper-
ators who voluntarily provided effluent samples and flow data.
Norman L. Peterson, Director, and the staff of the Division
of Water Supply and Pollution Control of the Department of Health,
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 LaClair A. Melhouse, the Adjutant General of
North Dakota, and Project Officer Colonel Irvin M. Sande, who
directed the volunteer efforts of the North Dakota National
Guardsmen, are also gratefully acknowledged for their assistance
to the Survey.
-------
IV
NATIONAL EUTROPHICATION SURVEY
STUDY LAKES AND RESERVOIRS
STATE OF NORTH DAKOTA
NAME COUNTY
Ashtabula Barnes, Griggs
Audubon McLean
Brush McLean
Darling Renville, Ward
Devils Benson, Ramsey
Jamestown Stutsman
LaMoure LaMoure
Matejcek Walsh
Metigoshe Bottineau
Pelican Bottineau
Sakakawea Dunn, McKenzie,
McLean, Mercer,
Mountrail, Wil-
liams
Spiritwood Stutsman
Sweet Briar Morton
Whitman Nelson, Walsh
-------
— 48 10'
\
\
*. ~ '" * jr '
- ~l
-.•*- - • -
— 4800
N. Dak.
X
DEVILS LAKE
Lake Sampling Site
Sewage Treatment Plant
Km.
10
Fort Totten
Map Location
99.10
99,00'
9850'
-------
DEVILS LAKE
STORE! NO. 3805
I. INTRODUCTION
Devils Lake was included in the National Eutrophication Survey as
a water body of interest to the North Dakota Department of Health.
Tributaries and nutrient sources were not sampled, and this report
relates only to the lake sampling data.
Devils Lake is in a closed basin, is relatively shallow, and gener-
ally remains thoroughly-mixed and well-oxygenated during ice-free months.
Thermal stratification is temporary and is readily disrupted by wind which
has an average annual velocity of 16 km/hr.
Devils Lake has a high concentration of total dissolved salts (14,000-
18,000 mg/1) as well as high organic nitrogen and phosphorus resulting
from sewage effluents and agricultural drainage into the lake (Armstrong,
Anderson, and Callender, 1966).
II. CONCLUSIONS
A. Trophic Condition:
Survey data indicate that Devils Lake is eutrophic. It ranked
thirteenth in overall trophic quality when the 14 North Dakota
lakes sampled in 1974 were compared using a combination of six
parameters*. All of the other lakes had less median total and
dissolved phosphorus, four had less median inorganic nitrogen,
ten had less mean chlorophyll a_, and nine had greater mean Secchi
disc transparency.
Survey limnologists noted large blooms of filamentous algae
* See Appendix A.
-------
2
as well as submerged and emergent macrophytes at all stations.
B. Rate-Limiting Nutrient:
The algal assay results indicate that Devils Lake was nitrogen
limited at the time the sample was collected (09/16/74). The lake
data indicate nitrogen limitation at all sampling times.
-------
III. LAKE CHARACTERISTICS1"
ii
A. Lake Morphometry :
1. Surface area: 48.00 kilometers2.
2. Mean depth: 2.6 meters.
3. Maximum depth: 9.1 meters*.
4. Volume: 124.800 x 106 m3.
B. Precipitation**:
1. Year of sampling: 35.0 centimeters.
2. Mean annual: 30.0 centimeters.
t Table of metric equivalents—Appendix B.
tt Armstrong, Anderson, and Callender, 1966.
* Henegar, 1975.
** See Working Paper No. 175, "...Survey Methods, 1973-76"
-------
4
IV. LAKE WATER QUALITY SUMMARY
Devils Lake 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 four
stations on the lake and from two or more depths at each station
(see map, page v). During each visit, a single depth-integrated (4.6
m or near bottom to surface) sample was composited from the stations
for phytoplankton identification and enumeration; and during the third
visit, a single 18.9-liter depth-integrated sample was composited
for algal assays. Also each time, a depth-integrated sample was collected
from each of the stations for chlorophyll a_ analysis. The maximum
depths sampled were 5.8 meters at stations 1 and 2, 6.1 meters at
station 3, and 3.0 meters at station 4.
The sampling results are presented in full in Appendix C and are
summarized in the following table.
-------
PARAMETER
TEMP (C)
DISS OXY (MG/L)
CNDCTVY (MCROMO)
PH (STAND UNITS)
TOT ALK (MG/L)
TOT P (MG/L)
OHTHO P (MG/D
N02*N03 (MG/L)
AMMONIA (MG/L)
KJEL N (MG/L)
INORG N (MG/L)
TOTAL N (MG/L)
CHLRPYL A (UG/L)
SECCMI (METERS)
A. SUMMARY OF PHYSICAL AND
1ST SAMPLING ( 4/29/74)
4 SITES
RANGE MEAM MEDIAN
2.8 - 7.5 4.6 4.3
0.4 - 10.8 6.4 7.b
2530. - 4440. 3646. 3637.
8.4 - 8.6 8.6 8.6
288. - 610. 420. 420.
0.434 - 1.560 0.890 0.845
0.355 - 0.924 0.713 0.765
0.320 - 0.620 0.<*62 0.480
0.050 - 0.320 0.139 0.090
1.800 - 3.600 2.855 2.700
0.370 - 0.800 0.601 0.590
2.160 - 4.080 3.316 3.200
3.6 - 21.6 8.7 4.8
0.9 - 2.3 1.7 1.8
CHEMICAL CriA^ACTEPISTlCS FUK OLVILS LAKE
STO*ET COOE 3H05
2ND SAMPLING ( 7/16/74)
4 SITES
RANGE
22.4 - 23.7
5.4 - 7.0
3115. - 5040.
8.6 - 8.9
290. - 460.
0.536 - 0.788
0.333 - 0.568
0.030 - 0.070
0.050 - 0.100
2.200 - 3.200
0.110 - 0.160
2.270 - 3.260
2.7 - 109.0
0.9 - 2.1
MEAN
23.3
6.3
4632.
8.8
390.
0.648
0.461
0.059
0.073
2.527
0.132
2.586
42.2
1.7
MEDIAN
23. J
6.4
4959.
8.8
398.
0.652
0.474
0.060
0.07U
2.400
0.130
2.460
2a.5
1.8
3HD SAMPLING ( 9/16/74)
<• SITES
KANfaE MEAN MEDIAN
12.8 - 14.9 13.5 13. 4
f.4 - 12.6 8.9 8.7
275d. - 3793. 3b39. 3672.
8.8 - 9.1 8.9 8.9
465. - 635. 548. 535.
0.360 - 0.770 0.475 0.461
0.191 - 0.340 0.301 0.320
0.020 - 0.080 0.035 0.02S
0.040 - 0.150 0.069 0.060
2.800 - 5.100 3.375 3.200
0.040 - 0.23U 0.104 0.090
2.820 - 5.120 3.410 3.23b
49.0 - 89.4 64.6 60.1
0.3 - O.to 0.5 0.6
-------
B. Biological characteristics:
1. Phytoplankton -
Sampli ng
Date
04/29/74
07/16/74
09/16/74
2. Chlorophyll a_ -
Sampling
Date
04/29/74
07/16/74
09/16/74
Dominant
Genera
1.
2.
3.
4.
5.
1.
2.
3.
4.
5.
1.
2.
3.
4.
5.
Flagellates
Dactlyococcopsis sp.
Chlorophytan lunate
Chroomonas sp_.
Cryptomonas s£.
Other genera
Total
Stephanodiscus sp.
Aphanizomenon sp.
Microcystis sp.
Phormidium sp.
Schroederia sjj.
Other genera
Total
Aphanizomenon sp.
Microcystis sp.
Schroederia sp.
Oocysti s sp.
Stephanodiscus sp_.
Other genera
Algal Units
per ml
1,004
521
cells 409
186
112
446
2,678
748
721
480
27
27
8J_
2,084
6,330
245
70
35
35
-
Total
Station
Number
1
2
3
4
1
2
3
4
1
2
3
4
6,715
Chlorophyll a
(ug/1)
5.7
3.9
3.6
21.6
2.7
30.
26.
109.0
89.4
49.0
67.3
52.9
-------
0.330
0.380
0.380
0.330
0.545
0.545
1.545
1.545
15.3
16.2
42.1
37.9
7
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/1-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 Devils Lake was high at the time the sample was collected
(09/16/74). The lack of an increase in yield with increased
orthophosphorus until nitrogen was also added and the sig-
nificant increase in yield when nitrogen alone was added
indicate nitrogen limitation.
The lake data indicate nitrogen limitation at all sampling
times; i.e., the mean inorganic nitrogen/orthophosphorus
ratios were less than 1/1 at all sampling times, and nitrogen
limitation would be expected.
Nitrogen limitation, as indicated by the algal assay or
by in-lake nitrogen to phosphorus ratios, does not necessarily
mean that the trophic condition of the lake can be improved
by controlling nitrogen inputs. In many cases, the apparent
condition of nitrogen-limitation results from excessive phos-
phorus input from point sources and is often accompanied by a
corresponding increase in primary production. In such cases,
the reversal of the enriched condition depends upon phos-
phorus control, not nitrogen control.
-------
8
V. LITERATURE REVIEWED
Armstrong, Richard, David W. Anderson, and Edward Callender, 1966.
Primary productivity measurements at Devils Lake, North Dakota.
Proc. ND Acad. Sci., vol 20, pp. 136-149.
Henegar, Dale, 1975. Personal communication (lake morphometry).
ND Game & Fish Dept., Bismarck.
Shubert, L. Elliot, 1976. The algal growth potential of Devils Lake,
North Dakota, 1974-1975. Dept. Biol., U. of ND (U.S. Bur. Reclam.
Research Contract 14-06-600-959A).
-------
VI. APPENDICES
APPENDIX A
LAKE RANKINGS
-------
LAKE DATA TO BE USED IN RANKINGS
LA
-------
PERCENT OF LAKES WITH HIGHER VALUES (NUMBEH OF LAKES WITH HIGrIEK VALUES)
LAKE
CODE LAKt NAME
3801 LAKE ASMTAbULA
380? LAKE AUDUdON
3803 B^Uiri LAKE
380«i LAKE JAILING
3805 DEVILS LAKE
380(1 JAMESTOWN RESERVOIR
38U7 LAKE LA MOURE
3808 HATEJCEK LAKE
3809 LAKE METIGOSME
3811 PELICAN LAKE
3812 LAKE SAKAKAWEA (GARRISON
381J SPIRIT WOOD LAKE
3810 SWEET BRIAR RESEKVOIR
3815 WHITMAN LAKE
MEDIAN
TOTAL P
27
69
77
15
0
54
8
38
92
as
100
46
62
27
<
(
(
(
<
(
(
(
(
(
(
(
(
(
3)
9>
10)
2>
0)
7)
1)
5>
12)
11)
13)
6)
8)
3)
MEDIAN
INOUG
54 (
46 <
77 (
38 (
69 (
15 (
8 (
0 (
92 <
100 (
62 <
23 (
85 (
31 (
N
7)
b)
10)
5)
9)
2)
1)
0)
12)
13)
8>
3)
11)
4)
500-
MEAN
MEAN SEC
IS (
46 (
38 (
23 <
31 (
62 1
69 (
8 1
92 1
100 1
85 1
77 1
54 1
0 i
2)
b)
b>
3)
4)
: 8)
: 9>
; i)
[ 12)
E 13)
C ID
E 10)
[ 7)
( 0)
CHLOKA
a (
69 I
38 <
0 (
23 <
62 (
b4 (
100 I
Ob (
77 (
92 (
31 (
15 <
46 (
1>
9)
5)
0)
3>
B)
7)
13)
11)
10)
12)
4)
2)
6)
15-
MIN
62 (
46 (
81 <
38 <
15 <
96 <
4 (
23 <
81 1
31 1
54 1
4 1
96 I
69 <
00
8)
b)
10)
5)
; 2>
: 12)
: o>
1 3)
! 10)
1 4)
: 7)
1 0)
t 12)
( 9)
MEDIAN
DISS 0
38 (
69 (
81 (
23 (
0 <
54 <
8 1
31 1
81 <
100 I
92 1
46 I
62 i
lb <
"*™° **
5)
9)
10)
3)
0)
: 7)
; i)
; 4)
[ 10)
: 13)
1 12)
1 6)
I 8)
C 2)
INOLX
NO
204
345
342
137
138
343
151
200
523
493
485
227
374
188
-------
LAKES RANKED BY INDE* NOS.
RAN* LAKE CODE LAKE NAME JNOE* NO
1 3n09 LAr.E ML T luOSnE 523
2 3fjll •'ELICAN LAr,tL
J 3612 LAf^E 5AKAl\A«EA
2. 3B03 BRUSH LAKE 39Z
s 3^1^ SWEET O^IAR RESERVOIR
6 3602 LAKL AUOUBGM
7 3806 JAMESTOWN RESERVOIR 343
8 3bl3 SPIRIT WOOD LAKE 2?7
9 3801 LAKt ASHTABULA 204
10 3808 MATEJCEK LAKE 200
11 3815 WHITMAN LAKE: IBS
12 3807 LAKE LA MOURt 151
13 3 BO 5 DEVILS LAKE 138
1<> 3804 LAKE DARLING 137
-------
APPENDIX B
CONVERSION FACTORS
-------
CONVERSION FACTORS
Hectares x 2.471 = acres
Kilometers x 0.6214 = miles
Meters x 3.281 = feet
-4
Cubic meters x 8.107 x 10 = 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
-------
STORE! RETRIEVAL DATE 75/11/0?
380501
43 01 52.0 098 5- 37.0
UEVILS LAKE
38071 NOKTH uAKOTA
DATE
FROM
TO
74/04/29
74/0 7/1&
74/09/16
00010
TIME DEPTH HATER
OF TEMP
DAY FEET
14
14
14
11
11
11
15
15
15
15
10
10
10
10
to
10
35
35
35
35
0000
0005
0014
0000
0005
0018
0000
0007
0015
0019
CENT
4.3
4.3
4.3
23.3
23.3
22.4
14.9
13.7
13.5
13.5
00300
DO
MG/L
9.0
7.6
6.6
6.4
6.2
12.6
9.6
9.0
8.4
11EPALES
00077
TRANSP
SECCHI
INCHES
90
72
12
00094
CNOUCTVY
FIELO
M1C30MHO
2530
3090
4180
5036
5034
4986
3793
3697
3681
3685
J
00400
PH
SU
8.60
8.60
8.55
8.60
8.80
8.80
9.07
8.91
8.97
9.05
00410
T ALI\
CACO3
MG/L
288
368
420
380
380
402
520
blO
500
465
211
001B
00610
NM3-N
TOTAL
MG/L
0.090
0.080
0.110
0.070
0.07C
0.080
0.050
0.040
0.060
0.040
1202
FEET DE
00625
TOT KJEL
N
MG/L
1.800
2.400
3.100
2.500
3.000
2.400
5.100
3.000
2.800
2.800
00630 00071
N02&N03 PnOS-UlS
N-TOTAL ORTHO
MG/L MG/L P
O.J60
0.400
0.590
0.070
0.060
0.070
0.020
0.020K
0.030
0.02UK
0. J55
0.470
0.672
0.474
U.t77
G.<*69
0.323
O.J26
0.340
0.317
DATE TIKE DEPTH
FROM OF
TO DAY FEET
74/04/29 14 10 0000
14 10 0005
14 10 0014
74/07/lb II 10 0000
11 10 0005
11 10 0010
11 10 0018
74/09/16 15 35 0000
15 35 0007
15 35 0015
15 35 0019
0665
iS-TOT
i/L P
0.434
0.578
0.755
0.652
0.666
0.546
0.770
0.463
0.470
0.432
32217
CrtLRPHYL
A
UG/L
5.7
2.7
89.4
00031
INCDT LT
HEMMING
PERCENT
l.C
K VALUE KNOWN TO BE
LESS THAN JNOICATEO
-------
iTORET RETRIEVAL DATE 75/11/07
380502
48 03 38.0 C<36 56 47.0
UtVILb LAKE
33071 NOHln OAKOTA
DATE
FROM
TO
74/04/29
74/0 7/io
74/09/16
TIME DEPTH
OF
DAY FEET
14 30 0000
14 30 0005
14 30 0013
10 30 0000
10 30 0005
10 30 0016
10 55 0000
10 55 001S
10 55 0019
00010
HATER
TEMP
CENT
4.0
3.7
2.8
23.5
23.5
23.4
13.5
13.3
13.3
00300
00
MG/L
5.2
0.4
6.6
6.4
6.2
8.4
8.0
8.0
00077
TflANSP
SECCHI
INCHES
66
72
24
00094
CNDUCTVY
FIELD
MICROMHO
4394
4308
4400
4873
4871
5040
3629
3616
3685
11EPALES
3
00400
Pri
S(J
8.50
6.50
8.45
8.90
8.90
8.90
B.93
8.96
8.95
00410
T ALK
CAC03
MG/L
445
460
530
398
390
tOO
525
550
535
211
0017
00610
NH3-N
TOTAL
MG/L
0.130
0.150
0.320
0.060
0.07U
0.070
0.060
0.070
0.080
1202
FEET OEPTri
00625
TOT KJEL
N
MG/L
3.300
3.300
3.600
2.400
2.200
2.300
3.300
2.900
3.100
00630
NO iff. NO 3
N-TOTAL
MG/L
0.550
0.620
0.483
0.060
0.070
0.060
0.020
0.020
0.050
00671
PhQS-uIS
OHTrtO
MG/L P
0.784
0.765
0.875
0.474
0.471
0.480
0.329
0.333
0.323
00665
DATE TIME DEPTH PHOS-TOT
FROM OF
TO DAY FEET MG/L P
74/04/29 14 30 0000
14 30 0005
14 30 0013
74/07/16 10 30 0000
10 30 0005
10 30 0016
74/09/16 10 55 0000
10 55 0015
10 55 0019
32217
CHLRPHVL
A
UG/L
0.655
0.845
0.960
0.668
0.636
0.644
0.460
0.457
0.454
3.9
30.5
49.0
00031
INCOT LT
WEMNING
PERCENT
-------
>TORET ,?ETaiEVAL DATE 75/11/07
330503
48 02 13.0 098 58 03.0
UEVILS LAK.E
38071 NOrfTH DAKOTA
DATE
FROM
TO
74/04/29
74/07/16
74/09/16
DATE
FROM
TO
74/04/29
74/07/lb
74/09/16
TIME DEPTH
OF
DAY FEET
16 20 0000
16 20 0005
16 20 0016
10 50 0000
iO 50 0005
10 50 0014
10 30 0000
10 30 0005
10 30 0015
10 30 0020
TIME DEPTH
OF
DAY FEET
16 20 0000
16 20 0005
16 20 0016
10 SO 0000
10 50 0005
10 50 0012
10 50 0014
10 30 0000
10 30 0015
10 30 0020
oOOlO
WATtR
TEMP
CENT
4.6
4.5
3.0
23.1
23.1
23.1
13.5
13.4
13.3
13.4
00665
PHOS-TOT
MG/L P
0.625
0.655
0.960
0.720
0.788
0.674
G.511
0.482
0.466
00300
00
MG/L
8.6
3.2
5.6
5.8
5.4
9.2
9.4
9.0
32217
CHLRPHYL
A
UG/L
3.6
26.5
67.3
00077
TRANSP
SECCHI
INCHES
72
84
22
00031
INCOT LT
REMNING
PERCENT
1.0
00094
CNOUCTVY
FIELD
MICKOMHO
3615
3637
4440
4961
4959
4959
3680
3669
3669
3672
11EPALES
3
00400
HH
su
8.60
8.60
8. 50
8.9Q
8.90
8.80
8.9]
8.89
8.94
a. 96
00410
T ALK
CAC03
MG/L
415
450
610
445
4bO
435
580
620
635
2111202
0019
00610
NH3-N
TOTAL
MG/L
0.090
0.080
0.320
0.080
0.090
0.100
0.060
0.050
0.060
FEET DEPTrl
00625
TOT KJEL
N
MG/L
2.700
2.700
3.600
2.600
2.400
2.400
4.400
3.400
3.300
00630
N02&NO3
N-TOTAL
MG/L
0.500
0.500
0.430
0.030
0.050
0.060
0.030
0.020K
0.030
006M
PnOS-uIS
UHTHU
MG/L P
0.584
0.606
0.894
0.502
0.568
0.457
0.311
0.310
0.311
K VALUE KNOWN TO HE
LESS THAN INDICATED
-------
5TDRET RETRIEVAL DATE 75/11/07
380504
48 03 31.0 099 01 t7.0
UEVILS LAKE
38071 MUrtH DAHOTA
11EPALE5
3
2111202
0006 FEET
DEPTH
DATE
FROM
TO
74/04/29
74/07/16
74/09/16
DATE
FROM
TO
74/04/29
74/07/16
74/09/16
TIME DEPTH
OF
DAY FEET
16 45 0000
16 45 0004
10 10 0000
10 10 OOOb
09 55 0000
09 55 0010
TIME DEPTH
OF
DAY FEET
16 45 0000
16 45 0004
10 10 0000
10 10 0006
09 55 0000
09 55 0010
00010
WATER
TEMP
CENT
7.5
7.5
23.7
23.7
12.8
12.8
00665
PHOS-TOT
MG/L P
1.560
1.560
0.600
0.536
0.370
0.360
00300
00
MG/L
10.8
7.0
7.0
8.0
7.4
32217
CHLRPHYL
A
UG/L
21.6
109.0
52.9
00077
TRANSP
SECCHI
INCHEb
36
36
22
00031
1NCDT LT
REMNING
PERCENT
1*0
00094
CNDUCTVY
FIELD
MICROMHO
2810
2801
3115
3115
2778
2758
7
P
I
b
36
36
22
00094
CNOUCTVY
FIELD
MICROMHO
2810
2801
3115
3115
2778
2758
00400
Pri
SU
8.60
8.60
8.80
8.80
8.83
8.83
00410
T ALK
CAC03
MG/L
314
324
314
?90
535
60S
00610
NH3-N
TOTAL
MG/L
0.050
0.060
0.060
O.ObO
0.110
0.150
00625
TOT KJEL
N
MG/L
2.500
2.400
3.200
2.400
2.900
3.500
00630
N02&N03
N-TOTAL
MG/L
0.320
0.330
0.060
0.060
0.080
0.080
00671
PriOS-OIS
URTHO
MG/L P
0.912
0.924
0.370
0.333
0.195
0.191
------- |