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

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                                   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

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                                   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

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                          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.

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                                 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.

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                                    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

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— 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'

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                                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.

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                                 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.

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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"

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                                      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.

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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

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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.

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                                     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).

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VI.  APPENDICES
                                   APPENDIX A
                                  LAKE RANKINGS

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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

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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

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    APPENDIX B
CONVERSION FACTORS

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                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

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        APPENDIX C
PHYSICAL and CHEMICAL DATA

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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

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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

-------