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Concentrations of Selected Herbicides, Herbicide Metabolites, and Nutrients in Outflow from Selected Midwestern Reservoirs, April 1992 through September 1993
By ELISABETH A. SCRIBNER, DONALD A. GOOLSBY, E. MICHAEL THURMAN, MICHAEL T MEYER, and WILLIAM A. BATTAGLIN
U.S. GEOLOGICAL SURVEY
Open-File Report 96-393
Prepared as part of theTOXIC SUBSTANCES HYDROLOGY PROGRAM
Lawrence, Kansas 1996
U.S. DEPARTMENT OF THE INTERIOR
BRUCE BABBITT, Secretary
U.S. GEOLOGICAL SURVEY
Gordon P. Eaton, Director
The use of firm, trade, and brand names in this report is for identification purposes only and does not constitute endorsement by the U.S. Geological Survey.
For additional information write to: Copies of this report can be purchased from:
District Chief U.S. Geological Survey 4821 Quail Crest Place Lawrence, Kansas 66049-3839
U.S. Geological Survey Branch of Information Services Box 25286 Denver, CO 80225-0286
CONTENTS
Abstract..............................................................................................................................................................................^ 1Introduction ........................................................ 1
Purpose and Scope....................................................................................................................................................... 4Objectives of Study ..................................................................................................................................................... 4
Description of Study Area..................................................................................................................................................... 4Selection of Reservoirs.......................................................................................................................................................... 5Methods.............................................................................................................................................................^ 5
Sample-Collection Schedule........................................................................................................................................ 5Sample-Collection Methods........................................................................................................................................ 5Sample Preparation...................................................................................................................................................... 10Laboratory Methods.................................................................................................................................................... 10
Gas Chromatography/Mass Spectrometry......................................................................................................... 10Solid-Phase Extraction and Enzyme-Linked Immunosorbent Assay for Alachlor Ethane
Sulfonic Acid............................................................................................................................................... 11Nutrients............................................................................................................................................................ 11
Quality Assurance.................................................................................................................................................................. 11Decontamination Procedures....................................................................................................................................... 11Sample Collection and Analysis.................................................................................................................................. 11GasChromatographyMassSpectrometry..............................» 12Solid-Phase Extraction and Enzyme-Linked Immunosorbent Assay for Alachlor Ethane Sulfonic Acid.................. 12
Ancillary Data........................................................................................................................................................................ 12Analytical Results................................................. 12References Cited..................................................................^ 14
FIGURES
1. Maps showing location of study area and selected reservoirs in the Midwestern United States............................ 22. Maps showing distribution of herbicide detections in selected Midwestern reservoirs and reservoirs in
which one or more herbicides exceeded U.S. Environmental Protection Agency Maximum Contaminant Levels or Health Advisory Levels for drinking water during late April through mid-May and late June through early July 1992........................................................................................................................................... 15
3. Boxplots showing the concentrations of alachlor, alachlor ethane sulfonic acid, atrazine, cyanazine, andmetolachlor during eight sampling periods in 1992-93.......................................................................................... 16
TABLES
1. Atrazine concentrations in water samples collected from selected Midwestern reservoirs during wintermonths, 1990-92..................................................................................................................................................... 4
2. Selected characteristics of reservoirs sampled for this study.................................................................................. 63. Concentrations of selected herbicides and metabolites in quality-assurance samples, 1992.................................. 134. Reservoir volume, evaporation, discharge, and stage measurements, April 1992 through September 1993......... 195. Analytical results for selected herbicides and six metabolites in samples collected from 76 reservoirs in the
Midwestern United States, April 1992 through September 1993 ........................................................................... 646. Analytical results for selected herbicides and six metabolites in samples collected from top and bottom of
17 reservoirs in the Midwestern United States, April 1992 through September 1993............................................ 937. Herbicide compounds analyzed and percentage of detections in 76 reservoirs for eight sampling periods
during April 1992 through September 1993 ........................................................................................................... 95
Contents
TABLES Continued
8. Physical properties and analytical results for nutrients collected from 76 reservoirs in the MidwesternUnited States, April 1992 through September 1993............................................................................................... 96
9. Physical properties and analytical results for nutrients collected from top and bottom of 17 reservoirs inthe Midwestern United States, April 1992 through September 1993..................................................................... 127
CONVERSION FACTORS, MISCELLANEOUS ABBREVIATIONS, AND ABBREVIATED WATER-QUALITY UNITS
Multiplyacre
acre-foot (acre-ft)acre-foot per acre (acre-ft/acre)
foot (ft)mile (mi)
pound (Ib)square mile (mi2)
ton
By4,0471,233
0.30480.30481.609
453.62.5900.9072
To obtainsquare metercubic metercubic meter per square metermeterkilometergramsquare kilometermegagram
Temperature can be converted to degrees Celsius (°C) or degrees Fahrenheit (°F) by the equations:
°C=5/9 (°F-32) °F=9/5 (°C)+32.
Miscellaneous Abbreviations
electronvolt (eV)inside diameter (id)mass to charge (m/z)millisecond (ms)milliseconds per ion (ms/ion)volt (V)volume-to-drainage-area ratio (Vol/DA)
Abbreviated Water-Quality Units
kilopascal (kPa)liter (L)meter (m)microgram per liter (|ig/L)microliter (uL)micrometer (urn)milligram per liter (mg/L)milliliter (mL)milliliter per minute (mL/min)millimeter (mm)nanogram (ng)nanogram per microliter (ng/uL)
IV Concentrations of Selected Herbicides, Herbicide Metabolites, and Nutrients in Outflow from Selected Midwestern Reservoir, April 1992 through September 1992
Concentrations of Selected Herbicides, Herbicide Metabolites, and Nutrients in Outflow From Selected Midwestern Reservoirs, April 1992 through September 1993By Elisabeth A. Scribner, Donald A. Goolsby, E. Michael Thurman, Michael T. Meyer, and William A. Battaglin
Abstract
Water samples were collected from 76 reser voirs in the Midwestern United States from April 1992 through September 1993 for the analy sis of selected herbicides, herbicide metabolites, and nutrients. This report presents a description of the study area, selection of reservoirs, sample- collection methods, sample preparation, labora tory methods, herbicide, nutrient, and quality- assurance data, and analytical results. Reservoir sites were sampled in 1992 during early spring before application of herbicides, during the first major runoff after application of herbicides and after significant flushing of the reservoir during late summer, and during early fall. In 1993, sam ples were collected during early winter, late win ter, and midsummer and during September following the 1993 flood. During August 1992, water temperature and dissolved-oxygen profiles were obtained from 17 selected reservoirs to investigate the effect of stratification on herbicide concentrations. Samples were analyzed by gas chromatography/mass spectrometry for 11 herbi cides and 6 metabolites and by solid-phase extrac tion and enzyme-linked immunosorbent assay for alachlor ethane sulfonic acid.
The data from the reservoir study have been useful in determining the occurrence and tempo ral distribution of selected herbicides and their metabolites in outflow from selected reservoirs in
the upper Midwest. The reservoir study also pro vided data to determine if the persistence of large concentrations of herbicides in reservoir outflow can be quantified on the basis of reservoir and drainage-basin characteristics, water and land use, herbicide use, and climate.
INTRODUCTION
This is the fifth in a series of water-quality reports intended to present the analytical results from studies of herbicides and nutrients in water resources of the Midwestern United States. This report presents the analytical results from a study of 11 preemergent her bicides, six triazine metabolites, and nutrients in out flow from 76 reservoirs located in 11 Midwestern States (fig. 1). Previous reports have presented analyt ical results from regional studies of herbicides and nutrients in ground water (Kolpin and others, 1993), surface water (Scribner and others, 1993), storm run off (Scribner and others, 1994), and precipitation (Goolsby and others, 1995). This study of herbicides and nutrients in reservoirs was conducted during 1992-93 and is one of several regional-scale studies conducted by the U.S. Geological Survey (USGS) as part of the Toxic Substances Hydrology Program.
Modern agricultural practices in the United States often require extensive use of herbicides for produc tion of corn, soybeans, sorghum, and other row crops. Data compiled by Gianessi and Puffer (1991) indicate that about two-thirds of the 628 million Ib of
Introduction
100°
EXPLANATION
Reservoir selected for study Number corresponds to map number used in tables
200 MILES I
I 80°
I
Base from U.S. Geological Survey digital survey, 1 :2,000,000, 1972Albers Equal-Area Conic projectionStandard parallels 39°30' and 43°30', central meridian -90°30'
Figure 1. Location of study area and selected reservoirs in the Midwestern United States.
herbicides applied annually in the United States (Aspelin and others, 1992) are used in crop production in the Midwestern United States. As a result, the Mid west is a major source area for transport of herbicides into the atmosphere, ground water, and streams. A summary of agricultural practices and herbicide and
land use for the Midwestern United States, by county, can be found in Battaglin and Goolsby (1995).
Reservoirs are an important part of hydrologic systems in the Midwestern United States. According to data compiled by Ruddy and Hitt (1990), about 440 large reservoirs in 11 upper Midwestern States
2 Concentrations of Selected Herbicides, Herbicide Metabolites, and Nutrients in Outflow from Selected Midwestern Reservoirs, April 1992 Through September 1993 ,
discharge streamflow to the Mississippi River. The function of these reservoirs is to impound surface water for many uses, including flood control, hydro- power, navigation, recreation, and aquatic life habi tat. These large reservoirs and numerous small reservoirs also serve as sources of drinking water for public supplies.
In addition to storing surface water, reservoirs also store undesirable substances such as sediment and toxic chemicals including pesticides. Much of the sediment entering reservoirs is deposited on the bot tom of the reservoirs. However, chemicals such as soluble herbicides generally remain in the water col umn and are stored only temporarily until they are flushed from the reservoir or removed from solution by biotic and abiotic processes.
Storage of herbicides is a potential problem in res ervoirs that receive drainage from agricultural areas in the upper Midwest. Recent studies by the USGS (Thurman and others, 1991,1992; Goolsby and others, 1993; Goolsby and Battaglin, 1995) have shown that most streams in the upper Midwest contain herbicides at some time during the year. Large quantities of her bicides are flushed from agricultural fields each spring and summer during rainfall following application of herbicides. Goolsby and Battaglin (1995) showed that median concentrations of the herbicides alachlor, atra- zine, cyanazine, and metolachlor in streams increased from March 1989 to July 1989. Also, Thurman and others (1991) showed that the median concentrations of herbicides in Midwestern streams in 1989 ranged from less than 0.30 |J,g/L before planting to as much as 3.0 (ig/L after planting and that the maximum concen trations in a few small streams reached 100 (ig/L. During late spring and early summer, concentrations of atrazine can exceed the U.S. Environmental Protec tion Agency's (1992) Maximum Contaminant Level (MCL) for finished drinking water of 3.0 (ig/L for sev eral weeks to several months in both small streams and large rivers, such as the Mississippi River (Goolsby and others, 1993).
Because reservoirs collect and store water, they can be affected by storm runoff that contains large concentrations of herbicides for a much longer period of time than the streams that supply the reservoirs (Stamer and Zelt, 1992; Stamer and others, 1995). This can substantially affect the water quality of streams downstream from reservoirs.
The length of time that reservoirs discharge water with increased concentrations of herbicides depends
on a number of factors, including residence time of water in the reservoir, timing of inflow to the reservoir, land use and herbicide use in the contributing drainage area, and the timing and intensity of rainfall. Unregu lated streams exhibit the flush effect (Thurman and others, 1991), which can produce high concentrations of herbicides for short periods of time. In contrast, maximum concentrations of herbicides in streams reg ulated by reservoirs are much lower, but increased concentrations can persist for much longer periods of time. Stamer and Zelt (1992) have shown that atrazine concentrations in Perry Lake, Kansas, remained near or greater than the MCL of 3.0 |ag/L from March 1989 through October 1989 and were greater than 1.0 |J,g/L through February 1990, whereas atrazine concentra tions in the principal tributary to Perry Lake exceeded the MCL for only a few months during late spring. Atrazine concentrations in some samples collected from the tributaries exceeded 10 [ig/L during late spring. Most of the water in Perry Lake was replaced with spring runoff containing these increased atrazine concentrations. Because little additional inflow to Perry Lake occurred after early summer, this "herbi cide-enriched" water was stored in the reservoir until the next spring when the cycle was repeated.
The process of storage and attenuation of herbi cides documented in Perry Lake occurs in most other Midwestern reservoirs to a greater or lesser degree depending on the physical and hydrologic characteris tics of the reservoirs and land use in the reservoir drainage basins. Data on file at USGS, Lawrence, Kansas, show atrazine concentrations in mid-winter samples collected during 1990-92 from several large reservoirs in Illinois, Iowa, Kansas, and Missouri (table 1). Water samples collected at the outflow from many of these reservoirs had atrazine concentrations of at least 2.0 |j,g/L during this time, which likely reflected the storage of herbicide-enriched inflow orig inating from the spring flush.
Processes such as microbial degradation, hydroly sis, photolysis, sorption, and volatilization could serve to remove herbicides from solution in reservoirs (Paris and Lewis, 1973; Butler and others, 1975; Geller, 1980; Jones and others, 1982; Jones and Winchell, 1984; Dries and others, 1987; Pelizzetti and Tosato, 1990; Plimmer, 1990; Goldberg and others, 1991; Kolpin and Kalkhoff, 1993). The rates at which these processes may occur vary for each herbicide and are a function of many factors including water temperature, pH, and dissolved oxygen. Herbicide metabolites
Introduction
Table 1. Atrazine concentrations in water samples collected from Midwestern reservoirs during winter months, 1990-92
[Data on file with U.S. Geoloigcal Survey, Lawrence, Kansas. Vol/DA, volume-to-drainage-area ratio; acre-ft, acre-feet; GC/MS, gas chromatography/mass spectrometry; ELISA, enzyme-linked immunosorbent assay; (ig/L, micrograms per liter, --, not data]
Map no. (fig. 1) Reservoir name
1458----
2022232324--
29
4346
Carlyle Lake outflowLake Decatur outflowLake Shelbyville outflowRend Lake spillwayLake Springfield at Spaulding DamLake Springfield at Sugar Creek
Coralville LakeLake Red RockRathbun LakeRathbun LakeSaylorville LakeCorydon Reservoir
Perry Lake
Long Branch LakeSmithville Lake
Sample Atrazine date concentration
(month/day Vol/DA by GC/MS /year) (acre-ft/acre) ftig/L)
Illinois
01/03/9201/08/9201/08/9201/02/9201/30/9201/30/92
Iowa
02/21/9202/12/9212/01/9002/20/9202/12/9202/01/92
Kansas
02/03/91Missouri
12/01/9012/01/90
0.14.05.31.59.34.34
.01
.01
.58 3.7
.58
.02--
.34 3.9
.50 2.01.1 4.0
Atrazine concentration
by ELISA (H9/L)
2.3.20
1.1.60
4.02.5
.20
.20--
2.8.10
10
--
----
such as deethylatrazine and deispropylatrazine (Thur- man and others, 1991), cyanazine amide, deethylcy- anazine, and deethylcyanazine amide (Meyer, 1994), and alachlor metabolites (Pereira and Rostad, 1990; Aga and others, 1994; Thurman and others, 1996) have been detected in samples from streams. Addi tional metabolites are likely to be present, but suitable analytical methods are not presently available to test for all of them.
Purpose and Scope
The purpose of this report is to describe the data- collection and analytical methods, the onsite and labo ratory quality-assurance procedures, the reservoir vol ume, evaporation, and stage measurements, and to present the results of analyses for 11 herbicides, 6 metabolites, and nutrients. These data were derived from samples collected at 76 Midwestern reservoirs during April 1992 through September 1993.
Objectives of Study
ie primary objectives of the study were to deter- the occurrence and temporal distribution of
selected herbicides, herbicide metabolites, and nutri ents in the outflow from selected reservoirs in the upper Midwest and to determine if the persistence of large concentrations of herbicides in reservoir outflow coulp be related on the basis of reservoir and drainage- basift characteristics, water and land use, herbicide use, and climate.
DESCRIPTION OF STUDY AREA
The study area (fig. 1) is defined as all hydrologic units in parts of 11 States (Illinois, Indiana, Iowa, Kan sas, Minnesota, Missouri, Nebraska, North Dakota, Ohio], South Dakota, and Wisconsin) that drain to the Ohio], upper Mississippi, and lower Missouri Rivers. Thisjarea comprises about 450,000 mi2 and is virtually
Concentrations of Selected Herbicides, Herbicide Metabolites, and Nutrients in Outflow from Selected Midwestern Reservoirs, April 1992 Through September 1993
the same area covered by the 1989-90 reconnaissance of herbicides in streams (Thurman and others, 1991, 1992; Scribner and others, 1993).
SELECTION OF RESERVOIRS
Reservoirs studied were selected from the reser voir data base compiled by Ruddy and Hitt (1990). This data base contains information for about 440 res ervoirs in the study area that have a normal storage volume of 5,000 acre-ft or maximum capacities of at least 25,000 acre-ft. To meet the objectives of the study, data on reservoir volume and reservoir dis charge (on at least a monthly frequency) were needed to determine the residence time of water in the reser voir and the timing of outflow. In addition, the reser voir outflow had to be accessible for sampling. These data were screened, with the assistance of USGS dis trict offices, to determine which reservoirs met the selection criteria. As a result of this screening, 74 res ervoirs in the reservoir data base were selected for sampling. Two additional reservoirs, Lakes Monona and Waubesa in Wisconsin (map numbers 71 and 72, fig. 1) which form a chain of reservoirs receiving out flow from Lake Mendota (map number 69, fig. 1) were also sampled. These three reservoirs were treated as a single unit. A listing of all 76 reservoirs that were sampled, along with selected characteristics, are given in table 2. The location of these reservoirs is shown in figure 1.
METHODS
Sample-Collection Schedule
Outflow from each reservoir was sampled eight times (approximately bimonthly) from April 1992 through September 1993. The timing and frequency of these samples made it possible to determine approx imately when maximum and minimum concentrations of herbicides occurred in the reservoir outflow.
The time of sample collections were:(1) Late April or early May 1992 Samples were col
lected before significant postplanting reservoir discharge occurred.
(2) Late June or early July 1992 Samples were col lected after significant postplanting runoff and flushing of the reservoir had occurred.
(3) Late summer or late August 1992.(4) Early fall or mid-October 1992.(5) Early winter or early January 1993.(6) Late winter or mid-March 1993.(7) Midsummer 1993.(8) September 1993 following the 1993 flood.
Sample-Collection Methods
Water samples were collected downstream from each reservoir near the centroid of flow or at other out flow points that would provide a representative sample of reservoir discharge. If the reservoir had both a top and bottom release, the sample was collected at a suffi cient distance downstream to ensure adequate mixing, or an equal-width increment, depth-integrated sam pling technique was used (Ward and Hair, 1990). About 2 L of water were obtained using depth- integrating samplers. The collection bottle used in the sampler was made of glass and precleaned as described in the "Quality Assurance" section under "Decontamination Procedures." If depth-integrated samples from several points in the cross section were required to obtain sufficient sample volume, the indi vidual samples were composited in a precleaned glass, Teflon, or stainless-steel container that held 2 to 4 L. The compositing container and bottles used in the sampler were rinsed thoroughly with sample water before compositing began.
In late July or August 1992, near the time of maxi mum water stratification, temperature and dissolved- oxygen profiles were obtained at 17 selected reservoirs (see table 2) using a dissolved-oxygen meter with a thermister. Profile measurements were made at approximately 3-ft intervals in the deepest part of each reservoir. A closer spaced interval was used in the thermocline region, which is the region of maximum rate of water-temperature change. At each depth, tem perature and dissolved-oxygen readings were allowed to stabilize before results were recorded. Water sam ples for herbicide and nutrient analyses were collected from these reservoirs within 3 ft of the water surface and as close to the reservoir bottom as possible with out disturbing the sediment by using a Kemmerer-type point sampler. Sampling was conducted at the same locations that temperature and dissolved-oxygen pro files were measured and were far enough away from reservoir outlet structures to avoid mixing effects that might be caused by outflow.
Methods
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Tabl
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Sel
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d ch
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of r
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sam
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for t
his
stud
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ontin
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Map
no.
(«g. 1
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iden
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3510
0548
3450
0548
8100
0690
3900
0548
1650
0689
1478
0691
4995
0686
5000
0685
7050
0689
0898
0691
2490
0688
6900
0687
4200
0686
8100
0533
8500
0524
7000
0530
1000
0520
6500
0523
1000
0521
9000
0520
1500
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Cor
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575
3,56
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3,86
514
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12,6
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1,01
313
,139
12,8
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0,54
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10,6
4311
4,79
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Dra
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3,11
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212
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7,85
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1,11
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322
9,62
85,
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287
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163
562
421
1,44
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Purp
ose
or u
se
of r
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1
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Tabl
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Sel
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d ch
arac
teris
tics
of re
serv
oirs
sam
pled
for t
his
stud
y C
ontin
ued
1
Concentratio
April 1
992
T»i O
CO
fa #!
"S- 2
.i
S. g- i is <g
o
« a » I <T a <p S §" w Q> a
z s
-2.
<P W 5' O 3 i h 9 8 1 s A
Map
no.
(fig- 1
)
41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58
Site
iden
tifer
3845
3709
4193
506
9225
0006
9062
0005
5078
0006
9213
50
0682
1140
0691
9000
0680
3450
0678
7500
0661
0746
0683
2500
0684
9500
0684
2500
0683
7500
0680
3132
0682
9500
0679
9090
0646
9425
Res
ervo
ir n
ame
Har
riso
nvill
e L
ake
Har
ry S
Tru
man
Res
ervo
irL
ong
Bra
nch
Lak
eM
ark
Twai
n L
ake
Pom
me
de T
erre
Lak
e
Smith
ville
Lak
eSt
ockt
on L
ake
Bra
nche
d O
ak L
ake
Cal
amus
Res
ervo
irC
unni
ngha
m L
ake
End
ers
Res
ervo
irH
arla
n C
ount
y L
ake
Har
ry S
trun
k L
ake
Hug
h B
utle
r L
ake
Paw
nee
Lak
eSw
anso
n L
ake
Will
ow C
reek
Res
ervo
ir
Pipe
stem
Res
ervo
ir
Riv
er n
ame
Mis
sour
i
Mid
dle
Big
Cre
ek (
outf
low
)O
sage
Riv
erE
ast F
ork
Litt
le C
hari
ton
Salt
Riv
erPo
mm
e de
Ter
re R
iver
Litt
le P
latte
Riv
erSa
c R
iver
Neb
rask
a
Oak
Cre
ekC
alam
us R
iver
Kni
ght C
reek
^Fr
ench
man
Cre
ekR
epub
lican
Riv
er
Med
icin
e C
reek
Red
Will
ow C
reek
Nor
th B
ranc
h M
iddl
e C
reek
Rep
ublic
an R
iver
Will
ow C
reek
Nor
th D
akot
a
Pipe
stem
Cre
ek
Wat
er
tem
per
at
ure
and
dis-
solv
ed-
oxyg
en
Surf
ace
area
prof
ile
(acr
es)
537
55,6
002,
400
18,6
0016
,100
7,20
024
,900
x 1,
800
._
_ _
2,40
522
,800
4,82
02,
682
740
10,0
40X
1,10
0
Dra
inag
e ar
ea(m
i2)
1411
,500 109
2,30
061
1
213
1,16
0
167 -
_ _^
_-_-
-
1,30
020
,753 85
060
0 -
8,10
0 --
400
Purp
ose
or u
seof
res
ervo
ir1
SR CH
RCR
SC
HS
CH
N
CR
SC
H
CR
IOR
CR
CIR
CI
CIR
CIR
CR
CIR
R CR
yj
<p CO
Tabl
e 2.
S
elec
ted
char
acte
ristic
s of
res
ervo
irs s
ampl
ed fo
r thi
s st
udy
Con
tinue
d
Map
no.
(f
ig-
1)
59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76
Site
iden
tifer
0322
8805
0323
0900
0322
5500
0314
7500
0322
8500
0309
1500
0322
1000
0647
0992
0536
5500
0536
0500
0542
8000
0536
9000
0542
9000
0542
9500
0539
8000
0535
6000
0540
4000
0537
0000
Res
ervo
ir n
ame
Alu
m C
reek
Lak
eD
eer C
reek
Lak
eD
elaw
are
Lak
eD
illon
Lak
eH
oove
r Res
ervo
ir
Milt
on R
eser
voir
O'S
haug
hnes
sy R
eser
voir
Sand
Lak
e
Chi
ppew
a Fl
owag
eD
airy
land
Res
ervo
irL
ake
Men
dota
Lak
e M
enom
inL
ake
Mon
ona
Lak
e W
aube
saL
ake
Wau
sau
Lak
e W
isso
ta (
5548
)L
ake
7746
Spri
ng V
alle
y L
ake
Riv
er n
ame
Ohi
o
Alu
m C
reek
of B
lack
Wal
nut C
reek
Dee
r Cre
ekO
lent
angy
Riv
erL
icki
ng R
iver
Big
Wal
nut C
reek
Mah
onin
g R
iver
Scio
to R
iver
Sout
h D
akot
a
Jam
es R
iver
Wis
cons
in
Chi
ppew
a R
iver
Ram
beau
Riv
erY
ahar
a R
iver
Red
Ced
ar L
ake
Yah
ara
Riv
er
Yah
ara
Riv
erW
isco
nsin
Riv
erC
hipp
ewa
Riv
erW
isco
nsin
Riv
erE
au G
alle
Riv
er
Wat
er
tem
per
at
ure
and
dis-
so
lved
- ox
ygen
pr
ofile
X -- - X -- __ - - - - X - - - - -- -
Surf
ace
area
(a
cres
)
3,38
71,
277
8,70
010
,285
2,82
5
1,66
082
9
5,22
0
15,3
001,
950
9,84
21,
405
3,27
4
2,08
01,
918
6,18
02,
150
233
Dra
inag
e ar
ea
(mi2
)
122
277
381
748
190
276
987
2,40
0
775
1,92
825
41,
770
279
327
4,02
05,
548
7,74
6 -
Purp
ose
or u
se
of r
eser
voir
1
CR
SC
OR
CO
RS
CO
RR
S
CR
SR
S
O OR
HR
NR
HR
NR
NR
HR
HR
HR
CR
1 Pur
pose
or
use
of re
serv
oir:
C, f
lood
con
trol
; H, h
ydro
pow
er; I
, irr
igat
ion,
N, n
avig
atio
n; O
, oth
er; R
, rec
reat
ion;
S, w
ater
sup
ply.
Sample Preparation
Herbicide samples were filtered through a 1-jim glass-fiber filter using a peristaltic pump. Nutrient samples were filtered through 0.45-jim membrane fil ters. Filters were leached with about 200 mL of dis tilled water followed by 25 to 50 mL of sample prior to collection of the sample.
The filtrate for herbicide analysis was collected in four precleaned, baked 125-mL amber glass bottles. The filtrate for nutrient analysis was collected in a 125-mL amber polyethylene bottle and treated with a mercuric chloride preservative. About 100 mL of sample were filtered into a 250-mL polyethylene bot tle for silica analysis. The remainder of the water in the compositing container was used for onsite mea surements of specific conductance and pH. All sam ples were chilled immediately and shipped to the appropriate laboratory within 3 days of collection. Herbicide samples were sent to the USGS laboratory in Lawrence, Kansas, for gas chromatography/mass spectrometry (GC/MS) analysis (Thurman and others, 1990) and enzyme-linked immunosorbent assay (ELISA). Nutrient and silica samples were shipped to the USGS National Water-Quality Laboratory in Arvada, Colorado, for analysis (Fishman and Fried- man, 1989).
Laboratory Methods
Herbicide sample bottles received at the USGS laboratory in Lawrence, Kansas, were logged in, assigned identification numbers, and refrigerated at 4 °C until analyzed. All of the reservoir samples were analyzed for 11 herbicides, two atrazine metabolites, and three cyanazine metabolites by GC/MS. The anal ysis included alachlor, ametryn, atrazine, cyanazine, metolachlor, metribuzin, prometon, prometryn, pro- pazine, simazine, and terbutryn as well as two atrazine metabolites, deethylatrazine and deisopropylatrazine, and three cyanazine metabolites, cyanazine amide, deethylcyanazine, and deethylcyanazine amide. In addition, the ethane sulfonic acid (ESA) metabolite of alachlor was isolated by solid-phase extraction (SPE) and analyzed by ELISA using the method of Aga and others (1994).
Gas Chromatography/Mass Spectrometry
Samples selected for GC/MS confirmation were extracted on carbon-18 (C^g) solid-phase cartridges by an automated procedure (Meyer and others, 1993). A Waters Millilab workstation was used for solid-phase extraction of the analytes. C 18 Sep-Pak-Plus car- tri(jlges were preconditioned sequentially with 2 mL each of distilled water, 6 mL ethyl acetate, 2 mL meth- anol, and 3 mL distilled water. Each 123-mL water sample was spiked with 100 \\L of a surrogate stan- darld, terbuthylazine (1.23 ng/jjL), and pumped through the cartridge at a rate of 20 mL/min by the robotic probe. Analytes were eluted with ethyl acetate and spiked robotically with 100 ng of phenanthrene- d 1Q. The ethyl acetate layer was transferred by probe to a clean test tube. The robotic probe was washed betjween samples by immersing in ethyl acetate and bubbling air through the probe to prevent sample cross contamination of herbicide standards. Finally, the extj-act was evaporated with a Turbovap at 45 °C under a nitrogen stream to a volume of 100 jlL and pipetted into a lOO-jlL crimp-top, polystyrene vial with a glass liner.
For the analysis of the 11 herbicides and atrazine metabolites, deethylatrazine and deisopropylatrazine, automated GC/MS analyses of the sample eluates wer[e performed on a Hewlett-Packard Model 58^0 GC and a 5970A mass selective detector (MSD). Operating conditions were as follows: ionization volt age! 7® e^' ion-source temperature, 280 °C; electron multiplier, 400 V over the autotune voltage; direct capjllary interface at 280 °C, initial GC oven tempera- turd, 60 °C, tuned daily with perfluorotributylamine; dwe|ll time, 25 to 50 ms/ion. Separation of the herbi- cid4s was carried out using a Hewlett Packard fused- silicja, ultra-1 capillary, 12 m x 0.2 mm id, GC column of njiethyl silicone film with a thickness of 0.33 jj,m. Helium was used as the carrier gas at a flow rate of 1 mL/min and a head pressure of 35 kPa. The column temperature was held at 60 °C for 1 minute and then ramped at 6 °C per minute to 250 °C. Injector temper- aturj^ was 280 °C. The filament and multiplier were not turned on until 15 minutes into the analysis. Quantification of the base peak of each compound was basejd on the response of the 188 ion m/z of the inter nal standard, phenanthrene-d10. Confirmation of the compound was based on the presence of the molecular ion and two confirming ions with a retention-time match of ±0.2 percent relative to phenanthrene-dio- The (preceding procedure is described in detail by
10 Concentrations of Selected Herbicides, Herbicide Metabolites, and Nutrients In Outflow from Selected Midwestern Reservoirs, April 1992 Through September 1993
Thurman and others (1990) and Meyer and others (1993).
For the separation of the cyanazine metabolites, cyanazine amide, deethylcyanazine, and deethylcy- anazine amide, a Hewlett Packard ultra-2 capillary, 12 m x 0.2 mm, GC column of methyl silicone with 5-percent phenyl film was used. The GC/MS condi tions for these analysis were the same as for the regu lar herbicide method except for the following: direct capillary interface at 210 °C, initial GC oven tempera ture, 140 °C; ramp rate, 15 °C per minute to 250 °C. Atrazine, cyanazine, deethylatrazine, and deisopropyl- atrazine were also analyzed to compare against the preceding GC/MS method. The quantitation limit for atrazine, deethylatrazine, deisopropylatrazine, cyanazine, cyanazine amide, and deethylcyanazine was 0.05 p,g/L and for deethylcyanazine amide, 0.50 \ig/L. This procedure is described by Meyer (1994).
Solid-Phase Extraction and Enzyme-Linked Immunosorbent Assay for Alachlor Ethane Sulfonic Acid
Alachlor ESA was analyzed by SPE-ELISA using the method described in Aga and others (1994). The SPE procedure was automated with a Waters Millilab workstation for analysis of the analytes. The C 18 Sep- Pak cartridges were preconditioned sequentially with 2 mL methanol, 6 mL ethyl acetate, 2 mL methanol, and 2 mL distilled water. Each 100-mL water sample was passed through a cartridge at a flow rate of 20 mL/min. The cartridge was eluted first with 3 mL ethyl acetate to remove parent alachlor and then eluted with 3 mL methanol to remove alachlor ESA, which was collected in a separate test tube. The methanol extracts were evaporated to dryness under nitrogen at 45 °C using a Turbovap. The samples then were reconstituted with 5 mL of distilled water and ana lyzed using an Alachlor RaPID assay kit. The concen trations of alachlor ESA were calculated by the following equation (Brady, 1995):
logit(y)=ln(y/l-y), (1)
where y = absorbance reading, which transformed data using alachlor ESA standards of 0, 1.0, 5.0, and 20 flg/L. Every 10th sam ple was analyzed in duplicate.
Nutrients
Dissolved nitrite plus nitrate, nitrite, ammonia, and orthophosphate were determined by an automated colorimetric procedure (Fishman and Friedman, 1989). Dissolved nitrate was calculated as the differ ence between determinations for nitrite plus nitrate and nitrite. Silica was determined by an automated procedure described in Fishman and Friedman (1989).
QUALITY ASSURANCE
Quality-assurance procedures for this study were carried out by USGS personnel in accordance with a written work plan for the study.
Decontamination Procedures
Onsite quality-assurance procedures required all bottles and sampling equipment to be cleaned by washing glass containers, filter units, and tubing with a phosphate-free laboratory detergent and rinsing with tap water, then rinsing with organic-free, deionized, or distilled water, rinsing with methanol, and rinsing again with organic-free water to remove traces of methanol. Bottles were inverted to drain and dry.
Sample Collection and Analysis
Quality-assurance samples consisted of blind rep licates, blind spikes, field equipment blanks, and labo ratory duplicates. About 5 percent of the samples were blind replicates, and an additional 5 percent of the samples consisted of blind spikes and field equipment blanks. All samples were collected in duplicate or triplicate. About 10 percent of all samples were ana lyzed in duplicate at the USGS laboratory in Lawrence, Kansas.
In addition, blind replicate samples for herbicide analysis were obtained during each sampling period. Replicates of regular samples were labeled with ficti- cious site information and submitted to the USGS lab oratory in Lawrence, Kansas, along with the regular samples for herbicide analysis. Results for the blind replicate analyses are included under sample type "BD" in table 5 at the end of this report.
Blind spikes for herbicide analysis were indepen dently prepared by the USGS National Water-Quality Laboratory in Arvada, Colorado, and submitted by
Quality Assurance 11
several USGS offices. These samples consisted of 125-mL bottles filled with solutions of known herbicide concentrations. They were labeled as reser voir samples and sent to the USGS laboratory in Lawrence, Kansas. Results for spike samples ana lyzed during the eight sampling rounds are shown in table 3.
Field equipment blanks for herbicides were obtained on the first sample processed and about every 20th sample thereafter. Organic-free water was fil tered into four 125-mL amber baked glass bottles labeled as a field equipment blank and shipped over night to the USGS laboratory in Lawrence, Kansas, along with the regular herbicide samples. During the 1992-93 sampling period, no herbicides were detected in any of the 37 field equipment blanks analyzed.
Gas Chromatography/Mass Spectrometry
For the GC/MS method, each water sample to be analyzed for herbicides and metabolites was spiked with a surrogate standard, terbuthylazine. An internal standard, phenanthrene-diQ, was added to the sample after it was extracted by SPE. The ratio of the terbuth ylazine to the phenanthrene-djQ was used to calculate the percent "recovery" of the sample. The internal standard was used to create a ratio with each individ ual compound to calculate concentrations. Quality- assurance protocols, to ensure the integrity of the sam ple handling, extraction, and analytical procedures, consisted of 10 percent blank samples and 10 percent standard solutions for the 1992-93 sampling period. Results of the laboratory duplicate analyses are included under sample type "LD" in table 5 at the end of this report.
Solid-Phase Extraction and Enzyme- Linked Immunosorbent Assay for Alachlor Ethane Sulfonic Acid
For the alachlor ESA method, results were quanti fied with solutions of alachlor concentration that ranged from 0 to 20 |Ag/L. Using the calibration curves, optical densities associated with calibration standards were examined. Samples were analyzed in duplicate and averaged. The reporting limit for alachlor ESA was 0.10 (ig/L.
ANCILLARY DATA
The following information was recorded at all sites during each sampling period: the type of sam pling location, type and quantity of reservoir discharge, unusual streamflow conditions, weather conditions, and debris conditions in the stream. The volume of water in reservoir storage, in acre-feet, was alsj) obtained for each sampling period from USGS records or U.S. Army Corps of Engineers records.Dai a on gaged reservoir inflow and outflow, and evaporation, when available, were also accumulated throughout the period of study. These data were obtjained as monthly totals from the U.S. Army Corps of Engineers records. Results are presented in table 4 at the end of this report.
[ Ancillary data including land use, herbicide use, contributing drainage area, and rainfall were obtained frojn the following sources and stored in a geographic information system (GIS) (Battaglin and Goolsby, 1995):
Land use 1987 Census of agriculture data (U.S. Department of Commerce, 1989a, 1989b)
Herbicide use (Gianessi and Puffer, 1991).
ANALYTICAL RESULTS
Analytical results for nine herbicides and six abolites in water-quality samples collected from eservoirs during 1992-93 are presented in table 5
me 76at the end of this report. Two additional herbicides, pronetryn and terbutryn, were analyzed but not detected. Analytical results for herbicide samples col lected near the top and bottom of 17 reservoirs are given in table 6. These data show, except for one res ervoir in Indiana and two reservoirs in Ohio, that there was very little difference between top and bottom concentrations.
A summary of results presented in table 7 shows thali atrazine was the most frequently detected and per- sist^nt herbicide, followed by alachlor ESA, deethyla- traz^ne, deisopropylatrazine, metolachlor, cyanazine ami^le, and cyanazine.
The distribution of herbicide detections in Mid- wes^ern reservoirs and reservoirs in which concentra tion^ of one or more herbicides exceeded U.S. Environmental Protection Agency Maximum Contaminant Levels or Health Advisory Levels for drinking water during late April through mid-May and
12 Concentrations of Selected Herbicides, Herbicide Metabolites, and Mutrients In Outflow from Selected Midwestern Reservoirs, April 1992 Through September 1993
Tabl
e 3.
C
once
ntra
tions
of s
elec
ted
herb
icid
es a
nd m
etab
olite
s in
qua
lity-
assu
ranc
e sa
mpl
es,
1992
[Ala
chlo
r eth
ane
sulf
onic
aci
d, c
yana
zine
am
ide,
dee
thyl
cyan
azin
e, a
nd d
eeth
ylcy
anaz
ine
amid
e w
ere
not s
elec
ted
for q
ualit
y-as
sura
nce
proc
edur
es;
amet
ryn,
pro
met
ryn,
and
terb
utry
n w
ere
not d
etec
ted;
D
EA
, dee
thyl
atra
zine
; DIA
, dei
sopr
opyl
atra
zine
; GW
M, b
lind
spik
e sa
mpl
e; ji
g/L
, mic
rogr
ams
per l
iter;
<, le
ss th
an; o
ne-h
alf d
etec
tion
limit
was
use
d in
cal
cula
tion
of m
ean
valu
es; N
WQ
L, U
.S.G
eolo
gica
l Su
rvey
Nat
iona
l Wat
er-Q
ualit
y L
abor
ator
y, A
rvad
a, C
olo.
]
Dat
e of
co
llect
ion
Qua
lity-
assu
ranc
e A
traz
ine
(mon
th/d
ay)
iden
tific
atio
n (H
9/L)
S. /tlcal Results
08/2
108
/21
08/2
108
/26
08/2
608
/27
08/2
708
/27
Mea
n
The
oret
ical
NW
QL
08/2
408
/24
08/2
408
/25
08/2
508
/27
08/2
7M
ean
The
oret
ical
N
WQ
L
GW
M1
GW
M1
GW
M1
GW
M1
GW
M1
GW
M1
GW
M1
GW
M1
GW
M1
GW
M1
GW
M2
GW
M2
GW
M2
GW
M2
GW
M2
GW
M2
GW
M2
GW
M2
GW
M2
0.09 .0
8.0
8.0
8.0
9.0
9.0
8.0
6.0
8
.07
.08
.69
.69
.71
.77
.78
.83
.85
.76
.70
.76
DEA 0.10 .1
0.1
0.1
0.1
0.1
2.1
0.0
9.1
0
.07
.13
.75
.78
.78
.84
.93
.99
.97
.86
.70
1.1
DIA
(ug/L
)<0
.05
.05
.05
.05
.05
.06
.05
.05
.05
.07
<.05 .3
5.3
6.3
5.3
7.3
3.3
6.3
9.3
6
.71
.38
Ala
chlo
r
0.08 .0
8.0
7.0
7.0
8.0
8.0
7.0
6.0
7
.07
.08
.55
.57
.56
.62
.73
.78
.74
.65
.71
.75
Cya
nazi
ne
0.05 .0
5<.
05 .05
.07
.06
.06
.06
.05
.07
.10
.37
.35
.35
.40
.64
.67
.69
.50
.69
.80
Met
ol-
achl
or(ng
/L)
0.08 .0
7.0
7.0
7.0
7.0
7.0
7.0
6.0
7
.07
.07
.56
.50
.51
.56
.70
.74
.69
.61
.70
.72
Met
ri-
buzi
n
0.08 .0
7.0
7.0
7.0
8.0
9.0
8.0
7.0
8
.07
.10
.51
.55
.54
.59
.78
.83
.81
.66
.70
.72
Prom
eton
0.07 .0
7.0
6.0
7.0
7.0
7.0
6.0
5.0
7
.07
<.05 .5
7.5
8.5
9.6
3.6
7.7
1.7
2.6
4
.70
.64
Prop
azin
e(H
9/L)
<0.0
5<.
05<.
05<.
05<.
05<.
05<.
05<.
05<.
05
0 <.05 .0
8.0
9.0
8.0
9.0
8.0
8.0
8.0
8
.00
.08
Sim
azin
e
0.07 .0
7.0
7.0
7.0
7.0
7.0
6.0
5.0
7
.07
.10
.56
.57
.66
.62
.58
.62
.63
.61
.70
.74
late June through early July 1992 are shown in figure 2. Concentrations of alachlor, alachlor ESA, atrazine, cyanazine, and metolachlor for each of the eight sampling periods (data from table 5) are shown in figures 3A-E. These figures also show that atrazine had the largest concentration, followed by alachlor ESA, metolachlor, cyanazine, and alachlor.
Analytical results for nutrients are given in table 8 for the 76 reservoirs and in table 9 for samples col lected near the top and bottom of 17 reservoirs. Nitrate, nitrite, and silica concentrations in streams are derived from many anthropogenic and natural sources, including chemical fertilizers, animal wastes, domes tic sewages, legumes, mineralization of vegetation, and soil organic matter. Studies in the Midwest have provided results on the geographic distribution of nitrate in streams and also indicate that processes in addition to those governing herbicide transport are important in controlling the transport of nutrients to streams (Goolsby and others, 1993).
REFERENCES CITED
Aga, D.S., Thurman, E.M., and Pomes, M.L., 1994, Deter mination of alachlor and its ethane-sulfonic acid metabolite in water by solid-phase extraction and enzyme-linked immunosorbent assay: Analytical Chemistry, v. 66, no. 9, p. 1495-1499.
Aspelin, A.L., Grube, A.H., and Toria, R., 1992, Pesticide industry sales and usage, 1990 and 1990 and 1991 mar ket estimates: Washington, D.C., U.S. Environmental Protection Agency, 37 p.
Battaglin, W.A., and Goolsby, D.A., 1995, Spatial data in geographic information system format on agricultural chemical use, land use, and cropping practices in the United States: U.S. Geological Survey Water- Resources Investigations Report 94-4176, 87 p.
Brady, J.F., 1995, Interpretation of immunoassay data, in Nelson, J.O., Karu, A.E., and Wong, R.B., eds., Immu- noanalysis of agrochemicals: York, Pennsylvania, Maple Press, chap. 19, p. 266-287.
Butler, G.L., Deason, T.R., and O'Kelley, J.C., 1975, Loss of five pesticides from cultures on twenty-one planktonic algae: Bulletin of Environmental Contamination and Toxicology, v. 13, no. 2, p. 149-152.
Dries, D., De Corte, B., Liessens, J., Steurbaut, W., Dejon- ckheere, W., and Verstraete, W., 1987, Recalcitrance of atrazine at low levels to aerobic and hydrogenotrophic micro-organisms: Biotechnical Letters, v. 9, no. 11, p. 811-816.
Fishman, M.J., and Friedman, L.C., 1989, Methods fordetermination of inorganic substances in water and flu vial sediments: U.S. Geological Survey Techniques of Water-Resources Investigations, book 5, chap. Al, 545 p.
Geller, A., 1980, Studies on the degradation of atrazine by bacterial communities enriched from various biotopes: Archives of Environmental Contamination and Toxicology, v. 9, no. 3, p. 289-305.
Gianessi, L.P., and Puffer, C.M., 1991, Herbicides use in the United States National summary report, revised April 1991: Washington, D.C., Resources for the Future, 128 p.
Golcjlberg, M.C., Cunningham, K.M., and Squillace, P.J., 1991, Photolytic degradation of atrazine in the Cedar River, Iowa, and its tributaries, in Mallard, G.E., Aron- son, D.A., eds., U.S. Geological Survey Toxic Sub stances Hydrology Program Proceedings of the Technical Meeting, Monterey, Calif., March 11-15, 1991: U.S. Geological Survey Water-Resources Inves tigations Report 91^1034, p. 232-239.
Goo^sby, D.A., and Battaglin, W.A., 1995, Occurrence and | distribution of pesticides in rivers of the Midwestern United States, in Leng, M.L., Leovey, E.M., and Zubkoff, PL., eds., Agrochemical environmental fate: iBoca Raton, Fla., CRC Press, p. 159-173.
Goojsby, D.A., Boyer, L.L., and Mallard, G.E., eds., 1993, Selected papers on agricultural chemicals in water resources of the midcontinental United States: U.S. Geological Survey Open-File Report 93^18, 89 p.
Goojsby, D.A., Scribner, E.A., Thurman, E.M., Meyer, M.T., and Pomes, M.L., 1995, Data on selected herbi cides and two triazine metabolites in precipitation of the midwestern and northeastern United States, 1990- 91: U.S. Geological Survey Open-File Report 95^69, 341 p.
Jone(s, T.W., Kemp, W.M., Stevenson, J.C., and Means, J.C., 1982, Degradation of atrazine in estuarine water/sedi ment systems and soils: Journal of Environmental Quality, v. 11, no. 4, p. 632-638.
Jonek T.W., and Winchell, L., 1984, Uptake and photosyn- thetic inhibition by atrazine and its degradation prod ucts on four species of submerged vascular plants: Journal of Environmental Quality, v. 13, no. 2, p. 243-247.
Kolpin, D.W, Burkart, M.R., and Thurman, E.M., 1993, Hydrogeologic, water-quality and land-use data for the reconnaissance of herbicides and nitrate in near-sur face aquifers of the midcontinental United States: U.S. Geological Survey Open-File Report 93-114, 61 p.
Kolpin, D.W, and Kalkhoff, S.J., 1993, Atrazine degrada tion in a small stream in Iowa: Environmental Science and Technology, v. 27, no. 1, p. 134-139.
14 Concentrations of Selected Herbicides, Herbicide Metabolites, and Nutrients in Outflow from Selected Midwestern Reservoirs, April 1992 Through September 1993
100°
90°
Wisconsin! Late April through
/ mid-May 1992
' South Dakota ~ ~~^ ~ '
Base from U.S. Geological Survey digital survey. 1:2,000.000. 1972Albers Equal-Area Conic projectionStandard parallels 39°30' and 43°30'. central meridian -90°30'
100°
90°
EXPLANATIONNumber of herbicides or herbicide metabolites detected (14 possible)
O 0
© 1-4
O 5-8
O More than 8Solid black symbol indicates con centrations of one or more herbicides exceeded health-based limit
Late June through July 1992
, -) )- South Dakota ^ '
Base from U.S. Geological Survey digital survey. 1:2.000,000, 1972Albers Equal-Area Conic projectionStandard parallels 39°30' and 43°30'. central meridian -90°30'
200 MILES
200 KILOMETERS
Figure 2. Distribution of herbicide detections in selected Midwestern reservoirs and reservoirs in which one or more herbicides exceeded U.S. Environmental Protection Agency Maximum Contaminant Levels or Health Advisory Levels for drinking water during late April through mid-May and late June through early July 1992.
References Cited 15
100
10
1.0
CD
fcO-10CL V)ECD
D)
o 0.01
c 100
c gTO
Concent_ * o
1.0
0.10
0.01
A. Alachlor
-
i
s
-I I I ! i
-
t i
\^
9
IReporting limit
B. Alachlor ethane sulfonic acid
!
i ' j-
jy/ledian. ____ - - __
Reporting limit
1
-- ..-
April July Sept. Nov. Jan. 1992
I « :
^^^^. .
Mar. July Sept. 1993
EXPLANATION
; Maximum
i 95th percentile
i-L-i 75th percentile
- P
T:Median
J5th percent!
Minimum
Je
Figure 3. Boxplots showing the concentrations of (A) alachlor, (6) alachlor ethane sulfonic acid, (C) atrazine, (D) cyanazine, and (£) metolachlor during eight sampling periods in 1992-93.
16 Concentrations of Selected Herbicides, Herbicide Metabolites, and Nutrients in Outflow from Selected Midwestern Reservoirs, April 1992 Through September 1993
100
10
1.0
0.10
0.01
100
I I C. Atrazine
Reporting limit
£CDO> Ob£ 1.0
0.10
c o O
0.01
100
10
1.0
0.10
0.01
D. Cyanazine
Reporting limit
I I TE. Metolachlor
Reporting limit
April July Sept. 1992
Nov. Jan. Mar. July 1993
Sept.
Figure 3. Boxplots showing the concentrations of (A) alachlor, (B) alachlor ethane sulfonic acid, (C) atrazine, (O) cyanazine, and (£) metolachlor during eight sampling periods in 1992-93 Continued.
References Cited 17
Meyer, M.T., 1994, Geochemistry of cyanazine and its metabolites Indicators of contaminant transport in surface water of the Midwestern United States: Lawrence, University of Kansas, Department of Geol ogy, Ph.D. Thesis, 364 p.
Meyer, M.T., Mills, M.S., and Thurman, E.M., 1993, Auto mated solid-phase extraction of herbicides from water for gas chromatographic-mass spectrometric analysis: Journal of Chromatography, v. 629, p. 55-59.
Paris, D.F., and Lewis, D.L., 1973, Chemical and microbial degradation of ten selected pesticides in aquatic sys tems: Residue Reviews, v. 45, p. 95-124.
Pelizzetti, E., and Tosato, J.L., 1990, Photocatalytic degra dation of atrazine and other s-triazine herbicides: Environmental Science and Technology, v. 24, no. 10, p. 1559-1565.
Pereira, W.E., and Rostad, C.E., 1990, Occurrence, distribu tion, and transport of herbicides and their degradation products in the lower Mississippi River and its tributar ies: Journal of Environmental Science and Technol ogy, v. 24, p. 1400-1406.
Plimmer, J.R., 1990, Pesticide loss to the atmosphere: American Journal of Industrial Medicine, v. 18, p. 451-^66.
Ruddy, B.C., and Hitt, K.J., 1990, Summary of selected characteristics of large reservoirs in the United States and Puerto Rico, 1988: U.S. Geological Survey Open- File Report 90-163, 295 p.
Scribner, E.A., Goolsby, D.A., Thurman, E.M., Meyer, M.T., and Pomes, M.L., 1994, Concentrations of selected herbicides, two triazine metabolites, and nutri ents in storm runoff from nine stream basins in the Midwestern United States, 1990-92: U.S. Geological Survey Open-File Report 94-396, 144 p.
Scribner, E.A., Thurman, E.M., Goolsby, D.A., Meyer, M.T., Mills, M.S., and Pomes, M.L., 1993, Reconnais sance data for selected herbicides, two atrazine metab olites, and nitrate in surface water of the Midwestern United States, 1989-90: U.S. Geological Survey Open-File Report 93-^57, 77 p.
Stamer, J.K., Gunderson, K.D., and Ryan, B.J., 1995, Atra zine concentrations in the Delaware River, Kansas: U.S. Geological Survey Fact Sheet FS-001-94, 2 p.
Stamer, J.K., and Zelt, R.B., 1992, Distribution of atrazine and similar nitrogen containing herbicides, lower Kan sas River basin: U.S. Geological Survey Yearbook, Fiscal Year 1991, p. 76-79.
Thurman, E.M., Goolsby, D.A., Aga, D.S., Pomes, M.L., and Meyer, M.T., 1996, Occurrence of alachlor and its sulfonated metabolite in rivers and reservoirs of the
I midwestern U.S. The importance of sulfonation in the transport of chloroacetanilide herbicides: Environ mental Science and Technology, v. 30, no. 2, p. 569-574.
Trjurman, E.M., Goolsby, D.A., Meyer, M.T., and Kolpin, D.W., 1991, Herbicides in surface waters of the Mid western United States The effect of spring flush: Environmental Science and Technology, v. 25, p. 1794-1796.
1992, A reconnaissance study of herbicides and their metabolites in surface water of the Midwestern United States using immunoassay and gas chromatogra- phy/mass spectrometry: Environmental Science and Technology, v. 26, p. 2440-2447.
Thurman, E.M., Meyer, Michael, Pomes, Michael, Perry, C.A., and Schwab, A.P., 1990, Enzyme-linked immu- nosorbent assay compared with gas chromatogra- phy/mass spectrometry for the determination of triazine herbicides in water: Analytical Chemistry, v. 62, p. 2043-2048.
U.S. Department of Commerce, 1989a, Census of agricul ture, 1987 Final county file: U.S. Department of Commerce, Bureau of the Census [machine-readable data file].
1989b, Census of agriculture, 1987 Final county file technical documentation: U.S. Department of Commerce, Bureau of the Census, Data User Services Division, various pagination.
U.S. Environmental Protection Agency, 1992, Drinking water regulations and health advisories: Washington, D.C., U.S. Environmental Protection Agency, 11 p.
Ward, J.R., and Harr, C.A., 1990, Methods for collection and processing of surface-water and bed-material sam ples for physical and chemical analyses: U.S. Geolog ical Survey Open-File Report 90-140, 71 p.
18 Concentrations of Selected Herbicides, Herbicide Metabolites, and Nutrients in Outflow from Selected Midwestern Reservoirs, April 1992 Through September 1993
Table 4. Reservoir volume, evaporation, discharge, and stage measurements, April 1992 through September 1993
[-, data not available]
Date of collection
Map no. (month/ (fig. 1) Reservoir name year)
1 Carlyle Lake 04/9205/9206/9207/9208/92
09/9210/9211/9212/9201/93
02/9303/9304/9305/9306/93
07/9308/9309/93
2 Crab Orchard Lake 04/9205/9206/9207/9208/92
09/9210/9211/9212/9201/93
Evapor- - Volume ation
(acre-feet) (acre-feet)Illinois
292,994296,514287,965283,941280,170
283,690270,380270,380270,380270,380
270,380278,982374,616359,964307,914
419,306368,925530,578
61,49061,49061,49061,49061,490
61,49061,49061,49061,49061,490
Discharge
Inflow Outflow (acre-feet) (acre-feet)
75,45121,67926,00340,12672,972
23,1673,729
97,071287,861394,950
364,300280,640208,483180,476
78,783 119,861
150,169 25,09173,924 112,483
308,112 111,868
2,3564,744
..
6152,1829,906
21,31961,323
- Stage (feet above datum)
445.51445.65445.31445.15445.00
445.14 -
__
444.95448.47448.02446.08
449.93448.29453.10
~~ -
---~
Reservoir Measurements, April 1992 Through September 1993 19
Table 4. Reservoir volume, evaporation, discharge, and stage measurements, April 1992 through September 1993 Continued
Map no.Reservoir name
Date ofcollection Evapor- (month/ Volume ation
year) (acre-feet) (acre-feet)
Discharge
Inflow (acre-feet)
Outflow (acre-feet)
Stage (feet above datum)
2 Crab Orchard Lake Continued
Illinois Continued
02/93 61,490 03/93 61,490 04/93 61,490 05/93 61,490 06/93 61,490
6,35358,56138,60926,74122,051
07/93 08/93 09/93
61,49061,49061,490
1,457220
19,252
Devils Kitchen Lake 04/92 05/92 06/92 07/92 08/92
24,47024,47024,470
24,47024,470
1,4882,312
09/92 10/92 11/92 12/92 01/93
24,47024,47024,47024,47024,470
3101,2004,2635,239
02/93 03/93 04/93 05/93 06/93
24,47024,47024,47024,470
24,470
1,3896,9948,3062,5065,100
07/93 08/93 09/93
24,47024,47024,470
Lake Decatur 04/92 05/92 06/92 07/92 08/92
18,80018,80018,80018,80018,800
34,84611,6048,352
87,03916,378
20 Concentrations of Selected Herbicides, Herbicide Metabolites, and Nutrients In Outflow from Selected Midwestern Reservoirs, April 1992 Through September 1993
Table 4. Reservoir volume, evaporation, discharge, and stage measurements, April 1992 through September 1993 Continued
Date of collection
Map no. (month/ (fig. 1) Reservoir name year)
4 Lake Decatur Continued 09/9210/9211/9212/9201/93
02/9303/9304/9305/9306/93
07/9308/9309/93
5 Lake Shelbyville 04/9205/9206/9207/9208/92
09/9210/9211/9212/9201/93
02/9303/9304/9305/9306/93
07/9308/9309/93
Evapor- - Volume ation
(acre-feet) (acre-feet)Illinois Continued
18,80018,80018,80018,80018,800
18,80018,80018,80018,80018,800
18,80018,80018,800
201,302208,078209,826252,991234,485
212,056209,790209,790209,790209,790
209,790202,554254,628223,641234,248
309,223290,578369,322
Discharge
Inflow Outflow (acre-feet) (acre-feet)
1,0193,608
164,47765,841
184,036
30,294131,728182,98765,02663,715
97,73417,92779,835
4,14510,55224,21840,62183,980
21,2831,230
49,944190,810212,990
160,110109,488
97,11177,970
44,152 28,271
96,456 17,99018,486 34,612
129,520 31,380
- Stage (feet above datum)
_-------
--------
__--~
599.13599.75599.91603.55602.05
600.11--------
_
599.26603.67601.13601.98
607.65606.33611.50
Reservoir Measurements, April 1992 Through September 1993 21
Table 4. Reservoir volume, evaporation, discharge, and stage measurements, April 1992 through September 1993 Continued
Date of collection
Map no. (month/ Volume (fig. 1) Reservoir name year) (acre-feet) (i
DischargeEvapor- ......._
ation Inflow icre-feet) (acre-feet)
Outflow (acre-feet)
Stage (feet above datum)
Illinois Continued
6 Lake Vermillion 04/92 9,20805/92 9,20806/92 9,20807/92 9,20808/92 9,208
09/92 9,20810/92 9,20811/92 9,20812/92 9,20801/93 9,208
02/93 9,20803/93 9,20804/93 9,20805/93 9,20806/93 9,208
07/93 9,20808/93 9,20809/93 9,208
7 Little Grassy Lake 04/92 23,69005/92 23,69006/92 23,69007/92 23,69008/92 23,690
09/92 23,69010/92 23,69011/92 23,69012/92 23,69001/93 23,690
02/93 23,69003/93 23,69004/93 23,69005/93 23,69006/93 23,690
----------
2,8174,903
69,12220,55280,723
12,33153,441
--~
_.---
_.----~
__--~--~
--..--_.
17,9035,960
13,34531,05510,881
2,9404,752
76,60420,33558,659
11,88958,65362,68821,14833,025
83,1299,644
30,444
372922
---~
3361,3014,6225,680
1,5067,5838,9712,7055,505
-------~
-----~
------~
---
------~
------
-----~
22 Concentrations of Selected Herbicides, Herbicide Metabolites, and Nutrients in Outflow from Selected Midwestern Reservoirs, April 1992 Through September 1993
Table 4. Reservoir volume, evaporation, discharge, and stage measurements, April 1992 through September 1993 Continued
Date of collection
Map no. (month/ (fig. 1) Reservoir name year)
7 Little Grassy Lake 07/93Continued 08/93
09/93
8 Rend Lake 04/9205/9206/9207/9208/92
09/9210/9211/9212/9201/93
02/9303/9304/9305/9306/93
07/9308/9309/93
9 Brookville Lake 03/9204/9205/9206/9207/92
08/9209/9210/9211/9212/92
Evapor- - Volume ation
(acre-feet) (acre-feet)Illinois Continued
23,69023,69023,690
232,040218,445201,237188,396178,744
177,865183,330183,330183,300183,300
183,300261,941274,000250,000240,585
238,170216,690244,755
Indiana
154,000186,000185,000184,000186,000
185,000185,000174,000145,500145,000
Discharge
Inflow Outflow (acre-feet) (acre-feet)
_..-
19,97417,71210,5724,8202,241
1,7851,8471,7851,847
26,360
31,18050,82050,18247,484
7,660 25,785
26,995 23,6637,458 17,653
49,587 15,293
2,6804,980
19,10036,09056,760
11,4807,150
17,12065,89019,630
- Stage (feet above datum)
_----
407.57406.90406.02405.33404.80
404.75-------
_
409.02409.66408.55407.90
407.60406.60407.90
742.13748.52748.34748.07748.55
748.38748.21746.19741.02740.37
Reservoir Measurements, April 1992 Through September 1993 23
Table 4. Reservoir volume, evaporation, discharge, and stage measurements, April 1992 through September 1993 Continued
Map no.Reservoir name
Date ofcollection(month/
year)
Evapor-Volume ation
(acre-feet) (acre-feet)
Discharge
Inflow (acre-feet)
Outflow (acre-feet)
Stage (feet above datum)
9 Brookville Lake Continued
Indiana Continued
01/93 145,000 02/93 145,000 03/93 164,000 04/93 185,000 05/93 185,000
52,72018,60038,74044,06036,980
740.45740.59744.11
06/93 07/93 08/93 09/93
185,000184,000184,000185,000
43,56024,8502,4007,080
10 Cataract Lake 03/92 04/92 05/92 06/92 07/92
08/92 09/92 10/92 11/92 12/92
28,00060,00029,30029,30049,100
29,30029,30028,00075,50031,500
10,26025,91038,6604,350
19,370
37,6904,3004,590
22,96063,510
636.98654.66637.58637.59649.03
637.44637.55636.98661.63639.01
01/93 02/93 03/93 04/93 05/93
47,10027,00030,00034,00029,000
40,76038,06040,12042,89026,920
648.90636.07638.27
06/93 07/93 08/93 09/93
29,00029,00073,00057,000
28,20010,44039,53048,070
11 Eagle Creek Reservoir 03/92 04/92 05/92 06/92 07/92
22,25622,20022,35922,96123,018
4,63026,2202,7403,120
15,690
24 Concentrations of Selected Herbicides, Herbicide Metabolites, and Mutrients in Outflow from Selected Midwestern Reservoirs, April 1992 Through September 1993
Table 4. Reservoir volume, evaporation, discharge, and stage measurements, April 1992 through September 1993 Continued
Date of collection
Map no. (month/ (fig. 1) Reservoir name year)
11 Eagle Creek Reservoir 08/92 Continued 09/92
10/9211/9212/92
01/9302/9303/9304/9305/93
06/9307/9308/9309/93
12 Huntington Lake 03/92 04/9205/9206/9?07/9
08/09/9210/9211/9212/92
01/9302/9303/9304/9305/93
Evapor- - Volume ation
(acre-feet) (acre-feet)Indiana Continued
22,018 22,13121,91522,08621,495
20,70021,13120,75621,73322,666
22,78022,57522,39322,757
4,650 12,00013,00013,00020,000
13,00010,0007,000
10,0005,500
4,6005,2006,000
13,20012,600
Discharge
Inflow Outflow (acre-feet) (acre-feet)
2,230 10,6104,510
50,6207,950
38,0706,480
28,80023,50010,690
6,64018,820
1,4005,300
24,540 64,100
8,59027,02091,890
32,89059,25027,160
141,30024,860
110,8002 1 ,940
125,50089,43017,060
- Stage (feet above datum)
--
-----
------~
--...~
738.10 748.67749.61749.14756.21
749.17746.67742.22745.62739.92
738.08739.40740.49
----
Reservoir Measurements, April 1992 Through September 1993 25
Table 4. Reservoir volume, evaporation, discharge, and stage measurements, April 1992 through September 1993 Continued
Map no. (fig. 1) Reservoir name
12 Huntington Lake Continued
13 Lake Shafer
14 Mansfield Lake
15 Mississinewa Lake
Date of collection (month/
year)
06/9307/9308/9309/93
-
03/9204/9205/9206/9207/92
08/9209/9210/9211/9212/92
01/9302/9303/9304/9305/93
06/9307/9308/9309/93
03/9204/9205/9206/9207/92
Evapor- - Volume ation
(acre-feet) (acre-feet)Indiana Continued
18,20015,10012,60011,200
--
29,40053,50051,40051,40058,000
51,40056,00036,000
101,00031,000
51,40016,20031,00052,00051,000
52,00051,00052,00051,000
49,00097,00075,00075,000
133,000
Discharge
Inflow Outflow (acre-feet) (acre-feet)
30,750153,400
14,6906,750
--
1,3407,6206,5502,1407,720
12,20017,29030,3806,780
74,940
31,63041,17017,77010,94011,240
12,45020,2906,440
10,260
20,06047,45039,55077,320
114,500
- Stage (feet above datum)
_----~
-
650.05663.35662.37662.05665.30
662.29664.52654.21681.02651.75
662.42640.69651.66
--~
727.41743.42737.18737.21751.27
26 Concentrations of Selected Herbicides, Herbicide Metabolites, and Nutrients in Outflow from Selected Midwestern Reservoirs, April 1992 Through September 1993
Table 4. Reservoir volume, evaporation, discharge, and stage measurements, April 1992 through September 1993 Continued
Date of collection
Map no. (month/ (fig. 1) Reservoir name year)
15 Mississinewa Lake 08/92Continued 09/92
10/9211/9212/92
01/9302/9303/9304/9305/93
06/9307/9308/9309/93
16 Monroe Lake 03/9204/9205/9206/9207/92
08/9209/9210/9211/9212/92
01/9302/9303/9304/9305/93
Evapor- - Volume ation
(acre-feet) (acre-feet)Indiana Continued
75,00051,00049,000
224,000101,000
24,60023,30051,00080,00076,000
80,00075,00075,00075,000
182,000205,000193,000182,000193,000
182,000170,000170,000190,000182,000
216,000193,000200,000211,000182,000
Discharge
Inflow Outflow (acre-feet) (acre-feet)
94,23077,54025,640
6,830157,000
209,00027,310
107,20069,08041,790
50,030131,200
11,86016,780
14,68012,51017,37011,26011,410
19,4504,5303,4409,500
14,070
32,70048,89068,75072,01054,940
- Stage (feet above datum)
737.17728.24727.20765.08744.20
713.02712.12728.26
----
__-----
538.41540.26539.05538.03539.44
538.23537.83537.59538.95538.30
541.10539.25539.91
--~
Reservoir Measurements, April 1992 Through September 1993 27
Table 4. Reservoir volume, evaporation, discharge, and stage measurements, April 1992 through September 1993 Continued
Map no.Reservoir name
Date of Dischargecollection Evapor-
(month/ Volume ation Inflowyear) (acre-feet) (acre-feet) (acre-feet)
Outflow (acre-feet)
Stage (feet above datum)
16 Monroe Lake ContinuedIndiana Continued
06/93 184,00007/93 180,00008/93 192,00009/93 193,000
13,7508,180
13,34024,990
17 Morse Reservoir
18 PatokaLake
03/9204/9205/9206/9207/92
08/9209/9210/9211/9212/92
01/9302/9303/9304/9305/93
06/9307/9308/9309/93
03/9204/9205/9206/9207/92
21,36721,41621,29321,28122,478
21,17121,40421,28121,52721,616
21,44121,37921,46521,53921,404
21,55121,30621,15821,342
162,000170,000170,000168,000165,000
7,94630,6884,619
27,84330,335
10,89811,4788,280
65,9249,790
43,1456,773
38,22629,80413,826
9,07234,0332,2444,017
1,5601,5501,6001,5501,600
534.65535.33535.29534.96534.70
28 Concentrations of Selected Herbicides, Herbicide Metabolites, and Nutrients in Outflow from Selected Midwestern Reservoirs, April 1992 Through September 1993
Table 4. Reservoir volume, evaporation, discharge, and stage measurements, April 1992 through September 1993 Continued
Date of collection
Map no. (month/ (fig. 1) Reservoir name year)
18 Patoka Lake Continued 08/9209/9210/9211/9212/92
01/9302/9303/9304/9305/93
06/9307/9308/9309/93
19 Salamonie Lake 03/9204/9205/9206/9207/92
08/9209/9210/9211/9212/92
01/9302/9303/9304/9305/93
06/9307/9308/9309/93
Evapor- - Volume ation
(acre-feet) (acre-feet)Indiana Continued
162,000161,000153,000153,000153,000
162,000155,000170,000187,000192,000
194,000186,000179,000183,000
32,50067,00054,50054,50082,000
54,50054,50036,000
114,00012,500
13,00011,30040,00056,00055,000
60,00082,00055,00050,000
Discharge
Inflow Outflow (acre-feet) (acre-feet)
1,6001,5501,5601,4901,540
11,15021,90014,69021,90010,910
7,4707,6903,2901,740
15,40028,25021,34026,29039,780
42,04041,99037,90059,340
132,800
97,74016,46064,67061,81022,710
37,48080,99031,43016,490
- Stage (feet above datum)
534.34534.01533.45533.51533.43
534.47533.74535.10
~-
~-~
745.56759.97755.41755.08763.83
755.20755.23747.67771.81731.73
732.21730.21749.33
~--
~-~
Reservoir Measurements, April 1992 Through September 1993 29
Table 4. Reservoir volume, evaporation, discharge, and stage measurements, April 1992 through September 1993 Continued
Date of collection
Map no. (month/ (fig. 1) Reservoir name year)
20 Coralville Lake 03/9204/9205/9206/9207/92
08/9209/9210/9211/9212/92
01/9302/9303/9304/9305/93
06/9307/9308/9309/93
21 Lake Panorama 03/9204/9205/9206/9207/92
08/9209/9210/9211/9212/92
Evapor- Volume ation
(acre-feet) (acre-feet)Iowa
26,90029,40029,60044,10097,100
44,40065,10065,020
125,61044,610
43,95426,99596,678
396,000278,000
448,000478,000378,00096,100
14,35014,40014,40014,30014,500
14,00014,40014,20014,50014,300
Discharge
Inflow (acre-feet)
253,310239,650184,72084,890
259,060
224,22087,44055,160
217,530190,870
117,50384,888
440,605673,000377,300
538,6001,206,000
940,400470,100
14,63020,67014,6507,690
14,420
8,69010,74010,75024,37022,913
Outflow (acre-feet)
252,520241,130184,05069,290
203,230
257,88067,58051,350
165,090271,180
115,61899,552
405,199462,700574,800
428,6001,276,0001,138,000
776,600
16,26019,63012,7408,050
12,500
10,27017,30011,29022,89023,820
Stage (feet above datum)
679.44680.15679.36683.31690.58
683.36686.41686.36693.14683.44
683.29679.39690.35709.23703.50
711.43712.65708.38690.22
45.4845.5245.5445.4645.69
45.0145.5245.2845.6145.30
30 Concentrations of Selected Herbicides, Herbicide Metabolites, and Nutrients in Outflow from Selected Midwestern Reservoirs, April 1992 Through September 1993
Table 4. Reservoir volume, evaporation, discharge, and stage measurements, April 1992 through September 1993 Continued
Date of collection
Map no. (month/ (fig. 1) Reservoir name year)
21 Lake Panorama Continued 01/9302/9303/9304/9305/93
06/9307/9308/9309/93
22 Lake Red Rock 03/9204/9205/9206/9207/92
08/9209/9210/9211/9212/92
01/9302/9303/9304/9305/93
06/9307/9308/9309/93
23 Rathbun Lake 03/9204/9205/9206/9207/92
Evapor- Volume ation
(acre-feet) (acre-feet)Iowa Continued
14,30014,30014,30014,30014,250
14,40014,30014,20014,500
245,000381,000272,000271,000343,000
271,000327,000156,320184,381137,313
272,553271,184346,616
1,040,0001,440,000
1,670,0001,230,000
584,000223,000
201,358 738289,669 1,622244,752 3,043209,872 4,750245,376 2,848
Discharge
Inflow (acre-feet)
11,0008,600
62,05039,83046,380
43,110163,10041,41027,750
881,310948,990569,240334,100646,940
464,420368,440283,560723,680665,860
237,544213,920
1,066,0521,849,0002,065,000
1,828,0004,414,0002,102,0001,597,000
15,679102,734
3,5601,636
58,443
Outflow (acre-feet)
11,0808,600
59,53038,97048,300
44,590167,90037,20025,540
938,670820,550671,750334,460586,320
521,380407,500307,080670,440766,860
239,428215,684970,864
1,255,0001,753,000
1,670,0004,878,0002,743,0001,993,000
18,37312,80245,43231,76620,094
Stage (feet above datum)
45.3445.3345.2945.4145.35
45.5245.4345.2245.62
740.88747.70742.32742.32745.26
742.27745.41744.28746.72742.35
742.36742.29745.93767.00774.85
778.68770.90754.84739.80
904.14911.25907.84904.90907.89
Reservoir Measurements, April 1992 Through September 1993 31
Table 4. Reservoir volume, evaporation, discharge, and stage measurements, April 1992 through September 1993 Continued
Date of collection
Map no. (month/ (fig. 1) Reservoir name year)
23 Rathbun Lake Continued 08/9209/9210/9211/9212/92
01/9302/9303/9304/9305/93
06/9307/9308/9309/93
24 Saylorville Lake 03/9204/9205/9206/9207/92
08/9209/9210/9211/9212/92
01/9302/9303/9304/9305/93
06/9307/9308/9309/93
Volume (acre-feet)
Evapor ation
(acre-feet)Iowa Continued
215,680 3,586457,709397,491417,836387,975
307,677249,002251,515263,000294,000
289,000559,000479,000394,000
89,10095,60089,00090,10090,100
89,700100,000103,00089,20088,662
88,60388,70299,720
567,000339,000
635,000537,000461,000139,000
5,4155,2963,1381,402
791639904
1,5272,340
i 2,9694,5846,1395,040
-~
-_
---_--
__~
Discharge
Inflow (acre-feet)
25,527290,221
2,13258,36452,106
13,57726,04380,85678,01073,269
35,772317,008
36,58520,936
544,411429,050265,430210,050379,210
242,260101,00037,860
357,230240,540
88,42462,032
343,3781,310,000
827,300
1,268,0001,676,000
830,300449,000
Outflow (acre-feet)
51,63042,77657,19034,88080,570
93,08484,08477,43767,37042,150
37,74044,040
112,300101,600
555,201410,803260,950207,200388,940
230,740102,21040,260
338,540208,270
95,02961,320
360,6201,058,0001,117,000
1,051,0002,018,000
949,100800,400
Stage (feet above datum)
905.41921.57918.21919.38917.65
912.52908.18908.38909.25911.58
911.23926.66922.70917.99
836.43837.50836.39836.59836.56
836.52838.33838.70841.81836.37
836.29836.31851.23883.99866.30
887.92882.03876.56843.80
32 Concentrations of Selected Herbicides, Herbicide Metabolites, and Nutrients in Outflow from Selected Midwestern Reservoirs, April 1992 Through September 1993
Table 4. Reservoir volume, evaporation, discharge, and stage measurements, April 1992 through September 1993 Continued
Date of collection
Map no. (month/ (fig. 1) Reservoir name year)
25 Clinton Lake 04/9205/9206/9207/9208/92
09/9210/9211/9212/9201/93
02/9303/9304/9305/9306/93
07/9308/9309/93
26 Hillsdale Lake 04/9205/9206/9207/9208/92
09/9210/9211/9212/9201/93
02/9303/9304/9305/9306/93
Volume (acre-feet)
Kansas
145,000142,800133,800137,400134,900
133,500130,767142,562128,936135,883
130,060138,341171,948168,509138,633
226,947167,798172,029
74,54073,16072,94075,95073,960
73,60072,48897,95694,47279,558
71,65673,54982,37187,24773,326
Evapor- - ation
(acre-feet)
9421,4961,7122,7533,396
3,3662,4851,012
615377
284434809
1,3732,033
3,0374,5943,197
506928
1,0931,9561,900
2,1801,7411,029
458268
194248518869
1,373
Discharge
Inflow (acre-feet)
9,4212,7519,612
18,5433,078
3,6401,507
33,16440,94917,940
19,37930,41787,243
101,88113,339
93,60014,34044,380
8,1521,0712,2126,545
873
2,156823
26,67828,53212,119
4,93913,95418,10933,699
7,765
Outflow (acre-feet)
6384,126
16,35212,495
1,910
1,9071,291
19,85453,49210,171
24,50321,23552,355
103,39840,679
1,79368,31336,385
8091,5801,4901,4901,190
98184179
31,55926,762
12,65111,8118,768
27,94620,311
- Stage (feet above datum)
877.70877.40876.16876.66876.31
876.11875.73877.37875.47876.45
875.63876.79881.20880.77876.83
887.57880.68881.21
916.62916.31916.26916.93916.49
916.41916.16921.34920.69917.71
915.97916.40918.30919.29916.35
Reservoir Measurements, April 1992 Through September 1993 33
Table 4. Reservoir volume, evaporation, discharge, and stage measurements, April 1992 through September 1993 Continued
Date of collection
Map no. (month/ (fig. 1) Reservoir name year)
Volume (acre-feet)
Evapor- - ation
(acre-feet)
Discharge
Inflow (acre-feet)
Outflow (acre-feet)
Stage (feet above datum)
Kansas Continued
26 Hillsdale Lake Continued 07/9308/9309/93
27 Kanopolis Lake 04/9205/9206/9207/9208/92
09/9210/9211/9212/9201/93
02/9303/9304/9305/9306/93
07/9308/9309/93
28 Milford Lake 04/9205/9206/9207/9208/92
09/9210/9211/9212/9201/93
129,22586,997
119,927
53,32052,38075,070
100,40068,450
49,40049,13752,55258,50950,748
55,08176,64468,25296,09794,390
339,984171,72381,265
323,000324,400354,800448,300397,700
406,000440,984440,633354,877359,666
2,4423,2852,368
7081,0711,2932,5192,678
2,0931,212
730456270
266444887
1,5612,013
4,6955,0002,896
1,8353,5173,8908,8969,142
10,1757,2973,1661,337
944
59,8215,246
38,291
1,1821,946
31,64652,01851,642
6,0147,9425,222
10,9987,192
74,186106,95154,48493,36850,908
391,01365,35353,244
13,5076,744
35,831222,306119,236
47,46476,64144,14266,46627,838
1,48244,188
2,987
1,3001,6108,340
26,56083,540
20,1101,5991,0774,586
14,684
69,58884,94361,98863,96250,600
140,723228,615140,807
1,8301,7602,230
129,400149,700
26,69034,16541,331
150,88422,099
926.60919.24925.13
1,462.291,462.011,467.771,472.801,466.26
1,461.101,462.901,463.901,465.501,463.38
1,464.601,469.621,467.821,473.311,473.00
1,501.901,484.681,470.55
1,139.901,140.001,142.141,147.951,144.96
1,145.471,147.541,147.521,142.151,142.48
34 Concentrations of Selected Herbicides, Herbicide Metabolites, and Nutrient* In Outflow from Selected Midwestern Reservoirs, April 1992 Through September 1993
Table 4. Reservoir volume, evaporation, discharge, and stage measurements, April 1992 through September 1993 Continued
Date of collection
Map no. (month/ (fig. 1) Reservoir name year)
28 Milford Lake Continued 02/9303/9304/9305/9306/93
07/9308/9309/93
29 Perry Lake 04/9205/9206/9207/9208/92
09/9210/9211/9212/9201/93
02/9303/9304/9305/9306/93
07/9308/9309/93
30 Pomona Lake 04/9205/9206/9207/9208/92
Volume (acre-feet)
Evapor- atlon
(acre-feet)Kansas Continued
367,048 801398,819433,666430,225484,132
1,244,586646,134448,246
238,200234,800234,200311,900231,600
240,900243,423259,618188,076191,747
188,284205,602238,114274,083245,177
693,404243,548315,296
77,93072,53071,74069,97065,880
9242,0414,0505,720
14,36017,9608,616
1,5492,6063,1345,6555,964
6,7124,5061,769
980504
450623
1,6382,7793,517
8,9599,9315,270
500873
1,0692,0191,745
Discharge
Inflow (acre-feet)
135,124247,309154,611216,853159,273
1,331,672249,838179,901
73,21012,83312,506
164,17122,354
61,4588,281
94,93992,18228,850
53,81257,164
221,712266,18248,893
527,42536,65586,787
14,8361,0006,942
26,3703,838
Outflow (acre-feet)
126,938214,609117,727216,24299,640
556,863830,340369,163
59,44013,4409,050
82,31090,350
44,8301,537
76,970162,74224,678
56,82439,225
187,559227,42574,285
70,243476,570
9,761
9,7306,6805,770
23,7005,360
Stage (feet above datum)
1,142.981,145.031,147.121,146.921,149.93
1,179.121,157.881,147.95
893.96893.68893.63899.40893.42
894.18894.39895.66889.53889.88
889.55891.15893.96896.74894.53
919.32894.40899.64
977.38976.07975.88975.45974.43
Reservoir Measurements, April 1992 Through September 1993 35
Table 4. Reservoir volume, evaporation, discharge, and stage measurements, April 1992 through September 1993 Continued
Date of collection
Map no. (month/ (fig. 1) Reservoir name year)
30 Pomona Lake 09/92Continued 10/92
11/9212/9201/93
02/9303/9304/9305/9306/93
07/9308/9309/93
31 Tuttle Creek Lake 04/9205/9206/9207/9208/92
09/9210/9211/9212/9201/93
02/9303/9304/9305/9306/93
07/9308/9309/93
Volume (acre-feet)
Kansas Contin
64,02062,10888,45780,60871,391
58,07769,85273,05490,14072,604
162,53787,60284,766
425,600434,200438,800860,300437,800
455,400392,401412,071300,869300,381
299,647357,889424,446691,683694,295
2,122,626945,624393,329
Evapor ation
(acre-feet)lied
2,0731,575
859393208 .
167246436839
1,321
2,4223,4312,019
1,6583,3043,3187,8219,231
9,0905,1712,3461,139
633
565859
2,1123,9775,675
18,01221,362
8,834
Discharge
Inflow (acre-feet)
1,200516
28,09634,97814,539
17,32627,61054,10992,063
6,268
93,7885,008
15,273
64,64145,838
101,117895,872265,870
138,922105,967136,135143,24661,121
293,911695,504492,178673,348494,598
2,584,719280,522343,993
Outflow (acre-feet)
998922893
42,43423,548
30,47315,59050,47574,13522,479
1,43676,51016,090
27,50035,10099,180
494,300670,600
105,500103,124114,116253,306
60,975
294,078636,405423,512402,125486,327
1,138,3791,436,155
887,438
Stage (feet above datum)
973.95973.46979.67977.95975.80
972.37975.43976.20980.02976.09
992.70979.49978.88
1,077.381,077.911,078.191,098.251,078.13
1,079.181,079.031,080.271,072.321,072.28
1,072.221,076.671,081.021,094.211,094.32
1,133.461,103.881,079.09
36 Concentrations of Selected Herbicides, Herbicide Metabolites, and Nutrients in Outflow from Selected Midwestern Reservoirs, April 1992 Through September 1993
Table 4. Reservoir volume, evaporation, discharge, and stage measurements, April 1992 through September 1993 Continued
Date of Map collection no. (month/
(fig. 1) Reservoir name year)
32 Waconda Lake 04/9205/9206/9207/9208/92
09/9210/9211/9212/9201/93
02/9303/9304/9305/9306/93
07/9308/9309/93
33 Wilson Lake 04/9205/9206/9207/9208/92
09/9210/9211/9212/9201/93
02/9303/9304/9305/9306/93
Volume (acre-feet)
Evapor- - ation
(acre-feet)Kansas Continued
187,300 1,958185,000223,500258,500239,300
233,700236,663235,915242,610239,681
278,073349,683301,704275,906315,459
918,222846,307737,842
191,200189,100198,600213,100227,600
227,000227,161228,368231,324234,585
257,891268,354253,470263,771268,162
3,9633,6735,9786,847
7,2224,6232,8131,214
952
8051,5713,0093,6505,899
10,73117,26413,063
1,7592,9122,3864,2514,278
4,6373,0721,9461,045
676
5491,0251,8112,5904,058
Discharge
Inflow (acre-feet)
6,2002,366
43,67844,46726,640
6,21212,0326,230
14,4147,246
60,010157,18052,47951,19197,442
657,580140,02591,420
1,2711,702
12,78919,37420,099
5,0143,4023,4514,3104,245
29,51858,80435,76238,20635,879
Outflow (acre-feet)
893922870
2,30240,211
4,8604,3044,1656,5059,223
20,81283,99997,44873,34051,991
44,085194,678186,823
9841,0401,0001,1001,160
1,180327298307307
5,66346,32248,83525,31327,429
Stage (feet
above datum)
1,450.931,450.711,454.141,456.931,455.43
1,454.981,455.231,455.171,455.701,455.47
1,458.391,463.201,460.061,458.231,461.00
1,486.931,484.651,480.95
1,509.901,509.631,510.831,512.611,514.32
1,514.251,514.271,514.411,514.751,515.12
1,517.671,518.771,517.201,518.291,518.75
Reservoir Measurements, April 1992 Through September 1993 37
Table 4. Reservoir volume, evaporation, discharge, and stage measurements, April 1992 through September 1993 Continued
Date of Map collection no. (month/
(fig. 1) Reservoir name year)
33 Wilson Lake Continued 07/9308/9309/93
34 Cross Lake 03/9204/9205/9206/9207/92
08/9209/9210/9211/9212/92
01/9302/9303/9304/9305/93
06/9307/9308/9309/93
35 Gull Lake Reservoir 01/9202/9203/9204/9205/92
06/9207/9208/9209/9210/92
Evapor- - Volume atlon
(acre-feet) (acre-feet)Kansas Continued
654,695 i 6,573629,706 9,370572,459 6,918Minnesota
10,15610,15610,15610,15610,156
10,15610,15610,15610,15610,156
10,15610,15610,15610,15610,156
10,15610,15610,15610,156
49,08050,76857,63461,93861,153
61,15360,50161,28457,11055,810
Discharge
Inflow Outflow (acre-feet) (acre-feet)
394,030 92247,903 63,52133,898 84,224
99,07097,48036,57011,47016,750
7,6008,4107,420
13,5608,440
6,3905,510
14,25075,23050,240
77,32066,45018,81020,420
6,5181,9563,3826,1895,472
5,5935,4721,2304,5821,107
Stage (feet
above datum)
1,547.731,546.291,542.83
------
----
----
---
1,193.081,193.211,193.741,194.071,194.01
1,194.011,193.961,194.021,193.701,193.60
38 Concentrations of Selected Herbicides, Herbicide Metabolites, and Nutrients In Outflow from Selected Midwestern Reservoirs, April 1992 Through September 1993 !
Table 4. Reservoir volume, evaporation, discharge, and stage measurements, April 1992 through September 1993 Continued
Map no.
(fig. 1) Reservoir name
35 Gulf Lake Reservoir Continued
36 Lac Qui Parle Reservoir
Date of collection (month/
year)
11/9212/9201/9302/9303/93
04/9305/9306/9307/9308/93
09/93
01/9202/9203/9204/9205/92
06/9207/9208/9209/9210/92
11/9212/9201/9302/9303/93
04/9305/9306/9307/9308/93
Evapor- - Volume atlon
(acre-feet) (acre-feet)Minnesota Continued
56,85154,90754,00351,41955,036
58,15964,55162,02160,89162,331
60,501
46,32539,18041,45037,88040,740
86,53559,55046,62544,75049,520
46,17545,65045,35034,69558,530
67,21069,015
112,750118,62556,660
Discharge
Inflow Outflow (acre-feet) (acre-feet)
1,9646,3956,2606,0423,499
9,08810,31119,12711,9693,376
3,207
16,47921,11078,582
. 63,31341,628
163,996146,95842,79619,9947,194
22,13617,0948,522
15,08029,523
273,400186,000185,100430,900372,000
Stage (feet
above datum)
1,193.681,193.531,193.461,193.261,193.54
1,193.781,194.271,194.001,193.991,194.10
1,193.96
933.71932.72933.06932.52932.96
938.09935.30933.75933.50934.12
933.69933.62933.58932.03935.18
936.18936.37940.30940.77934.96
09/93 58,105 92,426 935.13
Reservoir Measurements, April 1992 Through September 1993 39
Table 4. Reservoir volume, evaporation, discharge, and stage measurements, April 1992 through September 1993 Continued
Date of Map collection no. (month/
(fig. 1) Reservoir name year)
37 Leech Lake Reservoir 01/9202/9203/9204/9205/92
06/9207/9208/9209/9210/92
11/9212/9201/9302/9303/93
04/9305/9306/9307/9308/93
09/93
38 Pine River Reservoir 06/9207/9208/9209/9210/92
11/9212/9201/9302/9303/93
Evapor- - Volume ation
(acre-feet) (acre-feet)Minnesota Continued
464,814453,937478,960514,243 !520,562
524,357547,114540,787530,684497,802
i 502,863506,643515,509509,178499,067 '
566,092606,549607,814678,624 |622,183
601,488
102,310102,310103,124 !99,30695,801
95,52989,74986,94784,17786,947 i
Discharge
Inflow Outflow (acre-feet) (acre-feet)
45,13327,15011,0686,1297,194
6,3087,3797,0718,569
12,421
11,90116,04815,9589,520
35,170
9,63733,51312,33052,97011,662
49,000
5,53414,8193,136
11,0085,780
6,96211,4989,2077,4845,892
Stage (feet
above datum)
1,293.731,293.631,293.861,294.151,294.20
1,294.231,294.411,294.361,294.281,294.02
1,294.061,294.09
-~~
1,294.561,294.881,294.891,295.45
~
1,294.84
1,229.391,229.391,229.451,229.171,228.91
1,228.891,228.461,228.251,228.041,228.25
40 Concentrations of Selected Herbicides, Herbicide Metabolites, and Nutrients in Outflow from Selected Midwestern Reservoirs, April 1992 Through September 1993
Table 4. Reservoir volume, evaporation, discharge, and stage measurements, April 1992 through September 1993 Continued
Map no.
(fig. 1) Reservoir name
38 Pine River Reservoir Continued
39 Sandy Lake Reservoir
40 Winnibigoshish Reservoir
Date of collection (month/
year)
04/9305/9306/9307/9308/93
09/93
01/9202/9203/9204/9205/92
06/9207/9208/9209/9210/92
11/9212/9201/9302/9303/93
04/9305/9306/9307/9308/93
09/93
01/9202/9203/9204/9205/92
Evapor- - Volume ation
(acre-feet) (acre-feet)Minnesota Continued
100,394105,716101,487101,762102,036
100,667
44,60445,26851,27360,43061,629
62,38961,62963,62860,88657,753
56,30650,49946,27244,11548,694
62,67664,19963,05863,34262,772
62,389
618,467630,275662,431688,041687,384
Discharge
Inflow Outflow (acre-feet) (acre-feet)
4,33621,11433,38347,81519,948
12,296
12,1134,602
24,34948,79429,084
18,14924,226
2,58311,3065,288
10,11613,8359,6985,3772,884
27,56133,51350,25052,97011,662
4,455
28,46915,41614,08114,99513,404
Stage (feet
above datum)
_~----
1,229.37
1,229.27
1,214.341,214.421,215.131,216.151,216.28
1,216.361,216.281,216.491,216.201,215.86
1,215.701,215.041,214.541,214.801,214.80
1,216.391,216.551,216.431,216.461,216.40
1,216.36
1,296.951,297.131,297.621,298.011,298.00
Reservoir Measurements, April 1992 Through September 1993 41
Table 4. Reservoir volume, evaporation, discharge, and stage measurements, April 1992 through September 1993 Continued
Date of Map collection no. (month/
(fig. 1) Reservoir name year)
Evapor- Volume ation
(acre-feet) (acre-feet)
Discharge
Inflow (acre-feet)
Minnesota Continued
40 Winnibigoshish 06/92 688,041 Reservoir Continued 07/92 709,053
08/9209/9210/92
11/9212/9201/9302/9303/93
04/93- 05/93
06/9307/9308/93
09/93
41 Harrisonville Lake 04/9205/9206/9207/9208/92
09/9210/9211/9212/9201/93
02/9303/9304/9305/9306/93
716,273700,514667,682
646,672638,148630,275623,053627,645
659,800714,314709,711730,710710,368
690,670
Missouri
6,7276,5866,3386,2866,113
5,9285,7646,8796,8086,858
6,8086,8337,0967,1706,711
--~
~-~~
~~-~
-
143209218252202
196134584333
3975
138195212
~-~
----~
~~~-
~
1,160274232385229
178150
2,4864,0821,949
8131,2023,721
11,6269,245
Outflow (acre-feet)
6,843 17,27819,36931,71642,304
38,08337,26234,31026,43624,287
9,8186,149
33,91841,81258,168
39,263
1,131167151150150
138142
1,3054,1091,645
692807
2,94111,3578,958
Stage (feet
above datum)
1,298.01 1,298.331,298.441,298.201,297.70
1,297.381,297.251,297.131,297.021,297.09
1,297.581,298.411,298.341,298.661,298.17
1,298.05
9.318.968.468.207.75
7.276.839.689.519.63
9.519.57
10.2110.399.27
42 Concentrations of Selected Herbicides, Herbicide Metabolites, and N April 1992 Through September 1993
in Outflow from Selected Midwestern Reservoirs,
Table 4. Reservoir volume, evaporation, discharge, and stage measurements, April 1992 through September 1993 Continued
Date of Map collection no. (month/ Volume
(fig. 1) Reservoir name year) (acre-feet)
41 Harrisonville Lake 07/93Continued 08/93
09/93
42 Harry S Truman Reservoir 03/9204/9205/9206/9207/92
08/9209/9210/9211/9212/92
01/9302/9303/9304/9305/93
06/9307/9308/9309/93
43 Long Branch Lake 03/9204/9205/9206/9207/92
08/9209/9210/9211/9212/92
Evapor ation
(acre-feet)Missouri Continued
6,837 2136,5357,018
1,223,5731,286,1401,242,3501,234,3531,421,264
1,198,4071,219,0641,197,8562,353,9832,158,768
1,488,7191,260,2681,216,813
~
1,760,575
1,248,1074,294,3262,828,9023,690,813
35,93237,81535,06232,43637,073
33,07430,46029,18845,25439,394
224153
4,19110,96315,82418,68025,775
24,31928,55622,86725,76518,056
8,0594,3464,453
~
19,859
22,46145,32050,50342,117
184333526845674
750766770448236
Discharge
Inflow (acre-feet)
11,104341
5,923
237,698659,591115,368285,479
1,120,489
349,597197,940
1,159,3442,059,1392,453,671
1,351,656546,506946,770
--
1,837,288
633,9963,046,219
322,4631,992,931
6,2888,749
484204
9,144
9781,267
16124,46612,952
Outflow (acre-feet)
10,764286
5,185
242,004586,063143,333274,799907,804
548,140148,724114,282877,244
2,630,827
2,013,644770,610985,777
~
1,311,306
1,124,00533,197
1,737,3851,088,904
5,3056,5382,7101,9863,832
4,2263,115
6657,948
18,570
Stage (feet
above datum)
9.588.83
10.02
706.36707.44706.69706.55709.60
705.91706.28705.90720.71718.74
710.60707.00706.24
714.23
706.79734.88724.99731.27
791.71792.45791.36790.94792.16
790.54789.42788.85795.15793.05
Reservoir Measurements, April 1992 Through September 1993 43
Table 4. Reservoir volume, evaporation, discharge, and stage measurements, April 1992 through September 1993 Continued
Date of Map collection Evapor- no. (month/ Volume ation
(fig. 1) Reservoir name year) (acre-feet) (acre-feet)
43 Long Branch Lake 01/93Continued 02/93
03/9304/9305/93
06/9307/9308/9309/93
44 Mark Twain Lake 03/9204/9205/9206/9207/92
08/9209/9210/9211/9212/92
01/9302/9303/9304/9305/93
06/9307/9308/9309/93
45 Pomme de Terre Lake 03/9204/9205/9206/9207/92
Missouri Continued
37,583 13935,93339,765
--
40,679
37,63550,91538,57243,832
620,967642,631568,149542,329543,802
526,659496,405453,037693,477637,414
606,097565,428
--
767,391
720,6631,276,9041,005,2381,311,119
257,851258,101254,209242,773237,433
111186
~
522
599768998772
---~
----~
__-----
---~
6151,4682,1862,4872,862
Discharge
Inflow (acre-feet)
9,9174,066
19,091~
5,147
6,57555,19010,90920,172
113,371154,312
11,0684,046
40,959
21,5807,3591,527
266,182189,977
87,87021,260
320,688-
127,874
84,794736,509205,126757,677
17,22620,350
9,4217,567
19,557
Outflow (acre-feet)
11,5905,603
15,076~
10,200
5,60539,34122,25814,138
86,241124,12676,66122,67126,737
32,23131,69236,49627,947
243,421
187,14082,195
197,455~
331,239
113,000155,934475,736452,536
11,66118,62811,12416,51222,037
Stage (feet
above datum)
792.36791.71793.19
~
791.52
791.67797.01792.74794.66
----~
---~
__---
616.49
614.50633.90625.46634.86
841.55841.58841.11839.69839.01
44 Concentrations of Selected Herbicides, Herbicide Metabolites, and Nutrients in Outflow from Selected Midwestern Reservoirs, April 1992 Through September 1993
Table 4. Reservoir volume, evaporation, discharge, and stage measurements, April 1992 through September 1993 Continued
Date of Map collection no. (month/
(fig. 1) Reservoir name year)
45 Pomme de Terre Lake 08/92Continued 09/92
10/9212/9201/93
02/9303/93
46 Smithville Lake 03/9204/9205/9206/9207/92
08/9209/9210/9211/9212/92
01/9302/9303/9304/9305/93
06/9307/9308/9309/93
47 Stockton Lake 03/9204/9205/9206/9207/92
Volume (acre-feet) i
Evapor ation
(acre-feet)Missouri Continued
238,212 2,943238,056234,482308,806240,797
256,770262,380
146,611174,960148,001146,465176,575
139,473138,913107,775122,577137,866
110,913123,543142,029
~
167,836
151,926220,286146,983209,119
879,796905,457904,707927,209
1,009,004
3,5212,9911,791
859
613625
395795
1,4401,9443,150
3,2413,4412,178
845571
315280377
~
1,460
1,9243,1264,0462,924
1,8454,3426,4036,2949,005
Discharge
Inflow (acre-feet)
9,8686,5452,688
102,02067,835
23,02861,339
11,63332,350
1,4662,610
43,244
4,8047,0512,483
24,29833,263
11,08813,35919,359
~
49,111
9,30276,93912,66472,198
33,37250,28124,36753,573
184,640
Outflow (acre-feet)
6,1493,1783,074
116,963134,983
6,44055,103
7193,264
26,9852,202
12,986
35,6654,167
31,4458,650
17,404
37,725444492
~
43,784
23,2725,442
81,9327,129
28,58220,28118,71224,779
107,026
Stage (feet
above datum)
839.11839.09849.04847.30839.44
841.42842.09
864.89868.59865.08864.87868.42
863.90864.22860.31861.40863.67
859.54861.55864.26
--
867.70
865.62873.81864.94872.59
867.20868.23868.20869.09871.71
Reservoir Measurements, April 1992 Through September 1993 45
Table 4. Reservoir volume, evaporation, discharge, and stage measurements, April 1992 through September 1993 Continued
Date of Map collection Evapor- no. (month/ Volume ation
(fig. 1) Reservoir name year) (acre-feet) (acre-feet)
47 Stockton Lake 08/92Continued 09/92
10/9211/9212/92
01/9302/9303/9304/9305/93
06/9307/9308/9309/93
48 Branched Oak Lake 03/9204/9205/9206/9207/92
08/9209/9210/9211/9212/92
01/9302/9303/9304/9305/93
06/9307/9308/9309/93
Missouri Continued
890,208 9,084849,239776,934
1,016,8131,113,898
977,135932,085958,542
944,515
990,1771,032,0511,011,6941,380,737
Nebraska
25,55725,76625,38225,55727,587
26,33826,04823,58524,07524,576
25,11926,57427,42426,99026,790
27,71330,36928,34627,823
9,8727,4449,5745,276
2,1401,5191,903
~
6,395
7,2589,279
12,18011,397
231453769789968
872725533297132
10298
182346422
674731693479
Discharge
Inflow (acre-feet)
43,08154,32716,750
262,145247,140
145,77566,426
138,010~
107,306
165,95779,07121,293
440,033
581662385964
4,858
2,7151,710
573787633
6451,9619,3173,7613,374
5,95218,6985,6075,304
Outflow (acre-feet)
139,60685,42081,60912,691
144,783
280,397109,954109,648
-
155,988
113,03427,92429,46759,591
0000
1,860
3,0921,2752,503
00
0404
7,9253,8483,152
4,35615,3136,9385,349
Stage (feet
above datum)
867.62865.95862.89872.49875.95
871.01869.28870.30
869.76
871.50873.05872.30884.48
1,283.751,283.871,283.651,283.751,284.88
1,284.191,284.031,282.611,282.901,283.19
1,283.501,284.321,284.791,284.551,284.44
1,284.951,286.361,285.291,285.01
46 Concentrations of Selected Herbicides, Herbicide Metabolites, and Nutrients in Outflow from Selected Midwestern Reservoirs, April 1992 Through September 1993
Table 4. Reservoir volume, evaporation, discharge, and stage measurements, April 1992 through September 1993 Continued
Date of Map collection no. (month/
(fig. 1) Reservoir name year)Volume
(acre-feet) |
Evapor- - ation
[acre-feet)Nebraska Continued
49 Calamus Reservoir 03/92 124,45104/9205/9206/9207/92
08/9209/9210/9211/9212/92
01/9302/9303/9304/9305/93
06/9307/9308/9309/93
50 Cunningham Lake 03/9204/9205/9206/9207/92
08/9209/9210/9211/9212/92
01/9302/9303/9304/93
125,108128,220122,640110,280
98,82081,40094,672
108,105108,520
108,427108,658125,362128,119128,067
126,786117,079107,28098,947
3,4223,5433,3913,2853,496
3,3013,2973,3283,3793,367
3,3633,3873,5623,523
1,5902,1801,6103,440
3,9103,5401,139
678411
449559
1,0391,7781,419
1,2491,6782,1191,292
51102172167210
1811511166829
22203771
Discharge
Inflow (acre-feet)
23,07020,22017,45018,54018,990
19,95019,41021,54419,83519,371
20,32819,18927,23824,60427,928
24,04130,55122,90120,248
7361,090
835355
1,242
466389486593453
421371
1,607946
Outflow (acre-feet)
7,26716,00011,77021,85031,190
33,33035,3507,1375,724
18,545
19,97218,3999,495
20,06926,561
24,07338,58030,58127,289
607867815294821
480242339474436
403327
1,392914
Stage - (feet
above datum)
2,243.422,243.552,244.162,243.062,240.50
2,237.952,233.672,236.982,240.032,240.12
2,240.102,240.152,243.602,244.142,244.13
2,243.882,241.932,239.852,237.98
1,121.411,121.721,121.331,121.061,121.60
1,121.101,121.091,121.171,121.301,121.27
1,121.261,121.321,121.771,121.67
Reservoir Measurements, April 1992 Through September 1993 47
Table 4. Reservoir volume, evaporation, discharge, and stage measurements, April 1992 through September 1993 Continued
Date of Map collection no. (month/
(fig. 1) Reservoir name year)
EVolume
(acre-feet) (a
DischargeEvapor ation Inflow cre-feet) (acre-feet)
Nebraska Continued
50 Cunningham Lake 05/93 3,473 88 1,093Continued 06/93
07/9308/9309/93
51 Enders Reservoir 03/9204/9205/9206/9207/92
08/9209/9210/9211/9212/92
01/9302/9303/9304/9305/93
06/9307/9308/9309/93
52 Harlan County Lake 03/9204/9205/9206/9207/92
3,556 140 1,5353,7233,6733,453
21,930
150 2,408141 1,05797 617
1,51022,850 -- 1,32023,090 -- 1,10023,820 -- 1,11018,060
16,52017,35018,36019,61020,910
22,28023,68025,26026,550
1,040
1,620982
1,1501,2701,300
1,5201,5401,8501,620
27,970 -- 1,770
27,85023,97020,34021,620
167,000
1,4401,7401,6901,280
11,080172,300 -- 8,730173,100 -- 3,870174,800 -- 5,477168,300 -- 5,253
Outflow (acre-feet)
1,0551,3112,093
964740
181741
1766,890
3,72022262322
2950819482
1,1105,8405,120
157
313157166
3,73914,484
Stage - (feet
above datum)
1,121.541,121.761,122.171,122.051,121.49
3,096.083,096.903,097.113,097.743,092.37
3,090.763,091.643,092.673,093.913,095.15
3,096.393,097.623,098.963,100.013,101.13
3,101.043,097.873,094.613,095.80
1,932.541,933.101,933.191,933.361,932.68
48 Concentrations of Selected Herbicides, Herbicide Metabolites, and Nutrients In Outflow from Selected Midwestern Reservoirs, April 1992 Through September 1993
Table 4. Reservoir volume, evaporation, discharge, and stage measurements, April 1992 through September 1993 Continued
Date of Map collection Evapor- - no. (month/ Volume ation
(fig. 1) Reservoir name year) (acre-feet) (acre-feet)
52 Harlan County Lake 08/92Continued 09/92
10/9211/9212/92
01/9302/9303/9304/9305/93
06/9307/9308/9309/93
53 Harry Strunk Lake 03/9204/9205/9206/9207/92
08/9209/9210/9211/9212/92
01/9302/9303/9304/9305/93
06/9307/9308/9309/93
Nebraska Continued
161,800160,400165,900170,900177,300
185,300201,000271,500291,200305,000
314,800397,800421,700409,000
28,87031,22032,75034,18029,790
29,62029,79031,86034,16034,800
35,16034,73034,27036,10038,030
39,42044,79038,85038,720
Discharge
Inflow (acre-feet)
13,8605,0105,7426,8485,930
6,72117,13362,00020,31814,788
11,99668,85036,00024,413
3,3302,7202,4402,4902,210
4,0902,0902,5302,7203,020
3,0703,8207,2803,5703,870
5,02014,5704,8004,300
Outflow (acre-feet)
20,2192,788
419253185
195159
1,440479451
8684,555
20,50534,490
292824
1,1505,930
4,1909524228
1,740
2,5604,590
10,7801,9501,710
4,19016,39010,7004,390
Stage (feet
above datum)
1,931.981,931.831,932.421,932.961,932.62
1,934.451,936.031,942.501,944.141,945.23
1,945.981,951.751,953.271,952.47
2,362.042,363.522,364.432,365.252,362.63
2,362.522,362.632,363.912,365.242,365.60
2,365.802,365.562,365.302,366.312,367.33
2,368.042,370.612,367.752,367.68
Reservoir Measurements, April 1992 Through September 1993 49
Table 4. Reservoir volume, evaporation, discharge, and stage measurements, April 1992 through September 1993 Continued
Date of Map collection no. (month/
(fig. 1) Reservoir name year)
Evapor- Volume ation
(acre-feet) (acre-feet)Nebraska Continued
54 Hugh Butler Lake 03/92 25,15004/9205/9206/9207/92
08/9209/9210/9211/9212/92
01/9302/9303/9304/9305/93
06/9307/9308/9309/93
55 Pawnee Lake 03/9204/9205/9206/9207/92
08/9209/9210/9211/9212/92
25,59025,54025,96024,530
25,16024,22024,62025,27025,950
26,84028,20031,65032,57033,310
33,35035,88034,32034,860
7,0777,1347,0137,1768,034
7,744 !7,5757,1126,8657,041
----
_----
_----
_---
----
_----
_----
.---
98185303317385
35429621711653
Discharge
Inflow (acre-feet)
1,6901,0501,0601,3301,370
2,180861
1,0801,2401,180
8451,4103,5601,7201,700
1,4004,3801,8301,520
247242182480
1,279
278127516633229
Outflow (acre-feet)
236213214622
2,560
2,6901,310
236225245
245234260234253
7402,5602,300
891
0000
36
2140
762764
0
Stage - (feet
above datum)
2,572.882,573.242,573.202,573.542,572.37
2,572.892,572.112,572.442,572.982,573.53
2,574.252,575.302,577.822,578.452,578.95
2,578.982,580.622,579.622,579.97
1,243.261,243.341,243.171,243.401,244.58
1,244.191,243.961,243.311,242.961,243.21
50 Concentrations of Selected Herbicides, Herbicide Metabolites, and Nutrients in Outflow from Selected Midwestern Reservoirs, April 1992 Through September 1993
Table 4. Reservoir volume, evaporation, discharge, and stage measurements, April 1992 through September 1993 Continued
Date of Map collection no. (month/ Volume
(fig. 1) Reservoir name year) (acre-feet)
55 Pawnee Lake Continued 01/9302/9303/9304/9305/93
06/9307/9308/9309/93
56 Swanson Lake 03/9204/9205/9206/9207/92
08/9209/9210/9211/9212/92
01/9302/9303/9304/9305/93
06/9307/9308/9309/93
57 Willow Creek Reservoir 03/9204/9205/9206/9207/92
Evapor- - ation
(acre-feet)Nebraska Continued
7,255 427,6038,0407,9417,971
8,1398,8358,9048,292
75,58081,07080,86082,94064,310
64,45064,20065,87069,75074,000
78,50086,05097,700
105,300111,800
111,40099,67092,72092,500
4,5804,8805,2305,1504,820
3870
135165
263292269188
~----~
--------
-------
----
-----
Discharge
Inflow (acre-feet)
256377
1,802516936
1,33910,4652,2791,579
10,6307,0002,3304,9901,920
7,6503,5102,9305,0006,210
5,7906,300
13,3408,7008,360
4,7203,3503,3102,780
1,740726
1,140522437
Outflow (acre-feet)
00
1,295480740
9089,4771,9402,001
443950
2,15020,040
5,6251,890
464337
528385
10494
2,82913,50310,427
1,764
346401438524398
Stage (feet
above datum)
1,243.511,244.001,244.581,244.451,244.49
1,244.641,245.621,245.711,244.91
2,743.732,745.092,745.042,745.542,740.76
2,740.802,740.732,741.192,742.232,743.33
2,744.462,746.282,748.932,750.572,751.92
2,751.832,749.362,747.822,747.77
1,621.941,622.471,623.061,622.941,622.38
Reservoir Measurements, April 1992 Through September 1993 51
Table 4. Reservoir volume, evaporation, discharge, and stage measurements, April 1992 through September 1993 Continued
Date of Map collection no. (month/
(fig. 1) Reservoir name year)
57 Willow Creek Reservoir 08/92Continued 09/92
10/9211/9212/92
01/9302/9303/9304/9305/93
06/9307/9308/9309/93
58 Pipestem Reservoir 04/92 05/9206/9207/9208/92
09/9210/9211/9212/9201/93
02/9303/9304/9305/9306/93
07/9308/9309/93
Volume (acre-feet) (
Nebraska Contii
5,3206,4807,0007,0706,940
6,9206,9707,6207,4407,470
7,6007,8507,2807,180
North Dakota
9,9568,2808,1658,0057,772
6,9506,8226,8936,8416,825
6,7997,597
14,73213,85713,012
55,12857,20743,607
Evapor- - ation
acre-feet)ued
-
-
-
--
~
-
-
-
-
--
162 202253347244
245165895230
3876
221288370
7341,061
771
Discharge
Inflow (acre-feet)
1,2001,6001,5701,100
780
549885
4,3804,5702,680
2,1907,8501,2801,290
1,282 987138165
11
32338
159-
14
128,2675,5001,8512,029
45,37510,6713,541
Outflow (acre-feet)
516408
1,4101,1401,010
649851
5,3005,8403,540
3,34010,1102,0701,700
1,4682,462
---~
----~
5954,9412,4382,503
2,5257,531
16,370
Stage (feet
above datum)
1,623.221,624.881,625.601,625.621,625.48
1,625.521,625.591,626.491,626.421,626.32
1,626.551,626.951,626.101,625.97
1,442.50 1,440.171,440.321,440.111,439.79
1,439.941,439.691,439.831,439.731,439.70
1,439.651,447.911,448.191,447.431,446.68
1,470.771,471.631,465.66
52 Concentrations of Selected Herbicides, Herbicide Metabolites, and Nutrients in Outflow from Selected Midwestern Reservoirs, April 1992 Through September 1993
Table 4. Reservoir volume, evaporation, discharge, and stage measurements, April 1992 through September 1993 Continued
Date of Map collection no. (month/
(fig. 1) Reservoir name year)
59 Alum Creek Lake 04/9205/9206/9207/9208/92
09/9210/9211/9212/9201/93
02/9303/9304/9305/9306/93
07/9308/9309/93
60 Deer Creek Lake 04/9205/9206/9207/9208/92
09/9210/9211/9212/9201/93
02/9303/9304/9305/9306/93
Evapor- - Volume ation
(acre-feet) (acre-feet)Ohio
46,28944,19641,94964,80166,427
67,26067,55771,00070,29670,724
70,20470,20482,05878,95280,054
79,05287,65076,381
21,88022,36321,75021,58221,401
21,58214,0326,1066,7216,456
6,66813,15723,65521,86721,789
Discharge
Inflow (acre-feet)
~~--~
_-----~
----~--
__----
__~~----
7507,6853,982
20,734
9,13723,73015,3436,3902,559
Outflow (acre-feet)
397618782964774
517841
8,2712,407
13,830
3,66910,2504,7782,1392,582
8,310403509
12,6347,727
12,70320,948
5,318
1,5964,824
11,6924,368
21,229
9,57320,79710,8086,5272,634
Stage (feet
above datum)
875.91875.03874.06882.90883.45
883.73883.92884.96884.73884.87
884.70884.70888.35887.43887.76
887.46889.95886.65
810.66811.03810.56810.43810.29
810.43804.09796.51796.40796.05
796.33803.28812.00810.65810.59
Reservoir Measurements, April 1992 Through September 1993 53
Table 4. Reservoir volume, evaporation, discharge, and stage measurements, April 1992 through September 1993 Continued
Date of Map collection no. (month/
(fig. 1) Reservoir name year)
60 Deer Creek Lake 07/93Continued 08/93
09/93
61 Delaware Lake 04/9205/9206/9207/9208/92
09/9210/9211/9212/9201/93
02/9303/9304/9305/9306/93
07/9308/9309/93
62 Dillon Lake 04/9205/9206/9207/9208/92
09/9210/9211/9212/9201/93
Discharge
Volume (acre-feet) (Ohio Continu
21,53021,49121,067
evapor ation Inflow
acre-feet) (acre-feet)ed
10,738756727
14,06514,22113,93519,92513,987
13,88313,8839,0808,8308,850
8,0768,410
19,942
~
_
2,79632,6007,432
42,937
8,60041,93026,397
14,306 -- 4,11713,920 -- 8,412
13,880 -- 15,65412,738 -- 70412,565 -- 1,107
17,87017,83817,98117,87017,901
17,83818,052 - 3,98114,216 -- 27,40513,750 - 16,81314,106 -- 54,660
Outflow (acre-feet)
9,577498434
31,5557,1938,096
89,08614,058
3,5222,502
34,8136,694
43,081
8,64041,90823,098
4,0928,020
15,830842609
43,76317,01111,19492,88436,824
15,2933,875
29,51815,97554,916
Stage (feet
above datum)
810.39810.36810.03
915.05915.17914.95919.25914.99
914.91914.91910.68910.43910.45
909.64910.01919.26915.24914.94
914.90914.03913.88
737.24737.22737.32737.24737.26
737.22737.26734.80734.46734.72
54 Concentrations of Selected Herbicides, Herbicide Metabolites, and Nutrients in Outflow from Selected Midwestern Reservoirs, April 1992 Through September 1993
Table 4. Reservoir volume, evaporation, discharge, and stage measurements, April 1992 through September 1993 Continued
Date of Map collection no. (month/
(fig. 1) Reservoir name year)
62 Dillon Lake Continued 02/9303/9304/9305/9306/93
07/9308/9309/93
63 Hoover Reservoir 04/9205/9206/9207/9208/92
09/9210/9211/9212/9201/93
02/9303/9304/9305/9306/93
07/9308/9309/93
64 Milton Reservoir 04/9205/9206/9207/9208/92
Evapor- - Volume ation
(acre-feet) (acre-feet)Ohio Continued
13,46313,14727,66118,31618,300
18,17217,91717,648
53,72351,67049,69372,09068,417
65,35858,54271,78971,17571,757
71,88671,88671,88664,06764,600
65,30158,70351,157
16,95016,85017,26020,62022,090
Discharge
Inflow (acre-feet)
26,90893,16756,57616,00310,720
30,1483,8633,939
--------
_--------
--------
----
__------
Outflow (acre-feet)
27,29692,60051,43819,06311,069
29,3403,8814,120
7,8319,3578,684
12,9748,708
8,1794,5306,5863,361
20,251
4,60220,17414,1523,9453,535
9,3754,1963,368
2,1526,343
11,2784,546
37,437
Stage (feet
above datum)
734.25734.02742.59737.52737.51
737.43737.27737.10
887.59886.80886.03894.06892.92
891.89889.41893.97893.78893.96
894.00894.00894.00892.43892.62
892.87889.47886.60
945.30945.24945.49947.47948.30
Reservoir Measurements, April 1992 Through September 1993 55
Table 4. Reservoir volume, evaporation, discharge, and stage measurements, April 1992 through September 1993 Continued
Map no.
(fig. 1) Reservoir name
Date of Discharge Stagecollection Evapor- (feet
(month/ Volume ation Inflow Outflow aboveyear) (acre-feet) (acre-feet) (acre-feet) (acre-feet) datum)
64 Milton Reservoir Continued
09/92 10/92 11/92 12/92 01/93
Ohio Continu ed
21,62019,29016,90313,04611,988
31,3906,299
18,27711,75322,204
948.04946.69945.27942.80942.08
02/93 03/93 04/93 05/93 06/93
12,20818,30422,28822,16221,838
2,78224,491
5,4054,017
12,698
942.23946.12948.40948.34948.16
07/93 08/93 09/93
21,92821,55022,036
5,3015,2548,859
948.21948.00948.27
65 O'Shaughnessy Reservoir 04/92 05/92 06/92 07/92 08/92
09/92 10/92 11/92 12/92 01/93
17,65917,42117,02818,01517,848
17,90717,18417,55017,25317,788
69,44217,00829,126
223,33843,528
8,1794,195
72,62314,51186,700
848.60848.36847.96848.96848.79
848.85848.06848.49848.19848.73
02/93 03/93 04/93 05/93 06/93
07/93 08/93 09/93
17,28318,05518,05517,73817,847
17,54016,14515,990
21,950107,05056,22110,21415,796
65,0363,5311,515
848.22849.00849.00848.68848.79
848.48847.00846.82
Table 4. Reservoir volume, evaporation, discharge, and stage measurements, April 1992 through September 1993 Continued
Date of Map collection no. (month/
(fig. 1) Reservoir name year)
66 Sand Lake 03/9204/9205/9206/9207/92
08/9209/9210/9211/9212/92
01/9302/9303/9304/9305/93
06/9307/9308/9309/93
67 Chippewa Flowage 03/9204/9205/9206/9207/92
08/9209/9210/9211/9212/92
01/9302/9303/9304/9305/93
Evapor- - Volume ation
(acre-feet) (acre-feet)South Dakota
16,50019,10019,20019,80018,200
16,30016,90014,40012,90012,500
12,00011,60014,90018,40016,600
18,70026,70033,90029,300
Wisconsin
2,2502,2502,2502,2502,250
2,2502,2502,2502,2502,250
2,2502,2502,2502,2502,250
Discharge
Inflow Outflow (acre-feet) (acre-feet)
1928362
1431,100
6311,6302,5701,760
579
250241750
12,5707,640
5,70022,19058,39064,500
565,754752,044328,051137,833310,640
133,051194,980334,283339,655231,851
173,572179,049277,553610,300573,600
Stage (feet
above datum)
1,287.251,287.711,287.721,287.811,287.56
1,287.231,287.341,286.831,286.571,286.48
1,286.391,286.301,286.931,287.581,287.31
1,287.631,288.831,289.901,289.25
--~-----
--------
__----~~
Reservoir Measurements, April 1992 Through September 1993 57
Table 4. Reservoir volume, evaporation, discharge, and stage measurements, April 1992 through September 1993 Continued
Map no.
(fig. 1) Reservoir name
67 Chippewa Flowage Continued
68 Dairyland Reservoir
69 Lake Mendota
Date of collection (month/ Volume
year) (acre-feet) (
DischargeEvapor-
ation Inflow Outflow acre-feet) (acre-feet) (acre-feet)
Stage (feet
above datum)
Wisconsin Continued
06/93 2,250 - - 1,030,00007/93 2,25008/93 2,25009/93 2,250
03/92 44,00004/92 44,00005/92 44,00006/92 44,00007/92 44,000
08/92 44,00009/92 44,00010/92 44,00011/92 44,00012/92 44,000
01/93 44,00002/93 44,00003/93 44,00004/93 44,00005/93 44,000
06/93 44,00007/93 44,00008/93 44,00009/93 44,000
03/92 410,18904/92 412,95505/92 411,29606/92 409,45207/92 413,507
08/92 412,86209/92 412,86210/92 406,41111/92 411,20312/92 410,466
316,400187,400178,400
163,000235,900139,30059,370
122,600
65,67078,670
123,500104,10074,400
65,34056,85076,290
165,200185,200
287,300117,80078,52068,610
__---
---~
------~
----~
-----~
----
9.9.9.
689880
9.6010.04
__-
9.9.9.
979727
9.799.71
58 Concentrations of Selected Herbicides, Herbicide Metabolites, and Nutrients In Outflow from Selected Midwestern Reservoirs, April 1992 Through September 1993
Table 4. Reservoir volume, evaporation, discharge, and stage measurements, April 1992 through September 1993 Continued
Date of Map collection no. (month/
(fig. 1) Reservoir name year)
69 Lake Mendota 01/93Continued 02/93
03/9304/9305/93
06/9307/9308/9309/93
70 Lake Menomin 03/9204/9205/9206/9207/92
08/9209/9210/9211/9212/92
01/9302/9303/9304/9305/93
06/9307/9308/9309/93
Evapor- - Volume ation
(acre-feet) (acre-feet)Wisconsin Continued
407,241405,951424,382424,751413,876
417,101429,911425,027418,668
11,00011,00011,00011,00011,000
11,00011,00011,00011,00011,000
11,00011,00011,00011,00011,000
11,00011,00011,00011,000
Discharge
Inflow Outflow (acre-feet) (acre-feet)
_-----~
__~ --
149,600153,40092,57066,48081,360
53,54066,89073,82088,96066,720
60,31054,67091,840
137,200104,100
176,10095,64084,89068,500
Stage (feet
above datum)
9.369.22
11.2211.2610.08
10.4311.8211.2910.60
------
-------
-----
_--~
Reservoir Measurements, April 1992 Through September 1993 59
Table 4. Reservoir volume, evaporation, discharge, and stage measurements, April 1992 through September 1993 Continued
Map no.
(fig. 1) Reservoir name
Date of Discharge Stagecollection Evapor- (feet(month/ Volume ation Inflow Outflow above
year) (acre-feet) (acre-feet) (acre-feet) (acre-feet) datum)
71 LakeMononaWisconsin Cont inued
03/92 88,038 04/92 89,759 05/92 89,662 06/92 88,948 07/92 90,279
4.384.914.884.665.07
08/92 09/92 10/92 11/92 12/92
90,79990,83187,58488,46188,883
5.235.244.244.514.64
01/93 02/93 03/93 04/93 05/93
06/93 07/93 08/93 09/93
88,55987,38991,64293,65692,552
92,64996,48094,50093,526
4.544.185.496.115.77
5.806.986.376.07
72 Lake Waubesa 03/92 04/92 05/92 06/92 07/92
31,80132,80032,89632,55032,433
11,7308,4205,7603,0603,730
4.204.724.774.595.05
08/92 09/92 10/92 11/92 12/92
01/93 02/93
33,75933,14531,76331,99331,974
31,97431,398
2,76012,76014,17010,50012,610
15,03010,940
5.224.904.184.304.29
4.293.99
60 Concentrations of Selected Herbicides, Herbicide Metabolites, and Nutrients in Outflow from Selected Midwestern Reservoirs, April 1992 Through September 1993
Table 4. Reservoir volume, evaporation, discharge, and stage measurements, April 1992 through September 1993 Continued
Date of Map collection no. (month/
(fig. 1) Reservoir name year)
73 Lake Wausau 03/9204/9205/9206/9207/92
08/9209/9210/9211/9212/92
01/9302/9303/9304/9305/93
06/9307/9308/9309/93
74 Lake Wissota (5548) 03/9204/9205/9206/9207/92
08/9209/9210/9211/9212/92
E vapor- - Volume ation
(acre-feet) (acre-feet)Wisconsin Continued
13,900
13,90013,90013,90013,900
13,90013,90013,90013,90013,900
13,90013,90013,90013,90013,900
13,90013,90013,90013,900
128,558213,499206,612202,020208,907
192,837204,316208,907208,907167,585
Discharge
Inflow Outflow (acre-feet) (acre-feet)
374,000564,400269,000139,500132,700
102,400240,200200,700330,800226,200
166,400133,700230,200510,300465,400
709,300215,600168,900239,300
28,40033,68248,82825,84182,297
32,98229,86264,24452,63482,389
Stage (feet
above datum)
_------~
---~
---~
--~
1,306.181,312.221,311.551,311.301,311.61
1,310.851,311.441,311.811,311.741,308.93
Reservoir Measurements, April 1992 Through September 1993 61
Table 4. Reservoir volume, evaporation, discharge, and stage measurements, April 1992 through September 1993 Continued
Date of Map collection no. (month/
(fig. 1) Reservoir name year)
74 Lake Wissota (5548) 01/93Continued 02/93
03/9304/9305/93
06/9307/9308/9309/93
75 Lake 7746 03/9204/9205/9206/9207/92
08/9209/9210/9211/9212/92
01/9302/9303/9304/9305/93
06/9307/9308/9309/93
Evapor- - Volume ation
(acre-feet) (acre-feet)Wisconsin Continued
142,332114,78498,714
--
_---
2,0002,0002,0002,0002,000
2,0002,0002,0002,0002,000
2,0002,0002,0002,0002,000
2,0002,0002,0002,000
Discharge
Inflow Outflow (acre-feet) (acre-feet)
55,38347,81216,49933,68048,830
25,84082,30032,98029,860
609,1001,028,000
510,500253,100238,000
180,100558,500372,500614,200521,400
384,400312,200381,100
1,186,0001,022,000
1,612,000621,900381,200490,300
Stage (feet
above datum)
1,306.991,304.781,303.48
~~
_---~
_---~
----~
-----~
---
62 Concentrations of Selected Herbicides, Herbicide Metabolites, and Nutrients in Outflow from Selected Midwestern Reservoirs, April 1992 Through September 1993
Table 4. Reservoir volume, evaporation, discharge, and stage measurements, April 1992 through September 1993 Continued
Date of Map collection no. (month/
(fig. 1) Reservoir name year)
76 Spring Valley Lake 03/9204/9205/9206/9207/92
08/9209/9210/9211/9212/92
01/9302/9303/9304/9305/93
06/9307/9308/9309/93
Evapor- - Volume ation
(acre-feet) (acre-feet)Wisconsin Continued
2,068
2,0832,1142,0372,052
2,0372,0222,0222,0222,022
2,0072,0071,9762,0522,114
2,0372,0372,1442,068
Discharge
Inflow (acre-feet)
2,9405,9701,090
9142,200
6721,070
9181,540
700
594461
4,2003,8501,770
5,1201,2804,4401,080
Outflow (acre-feet)
6,3105,9801,5201,4402,510
1,0801,5301,3602,1201,220
1,090926
5,0204,9702,190
5,5601,9804,5101,580
Stage (feet
above datum)
940.61940.73940.94940.36940.53
940.39940.28940.29940.33940.26
940.25940.22940.01940.52940.93
940.44940.42941.10940.65
Reservoir Measurements, April 1992 Through September 1993 63
o> Ta
ble
5.
Ana
lytic
al r
esul
ts fo
r se
lect
ed h
erbi
cide
s an
d si
x m
etab
olite
s in
sam
ples
col
lect
ed fr
om 7
6 re
serv
oirs
in th
e M
idw
este
rn U
nite
d S
tate
s, A
pril
1992
thro
ugh
Sep
tem
ber
1993
? o
[E
SA, e
than
e su
lfoni
c ac
id; D
BA
, dee
thyl
atra
zine
; DIA
, dei
sopr
opyl
atra
zine
; Hg/
L, m
icro
gram
s pe
r lite
r; --
, no
data
, <, l
ess
than
. Sa
mpl
e ty
pe:
BD
, blin
d du
plic
ate;
LD
, lab
orat
ory
dupl
icat
e; S
, sam
ple.
3
Prom
etry
n an
d te
rbut
ryn
wer
e no
t det
ecte
d]
ations
of
Selected CD & 0 & (D 0) (D 3- o' Q. 2 S I 1 Q> 3 Q.
f 1 1 3 O 3 ^> » ft Q. 2
a i 8 3 £ CD ! -i
Dat
e of
co
llec-
M
ap
tion
no.
(mon
th/
(fig
. 1)
Res
ervo
ir n
ame
day/
year
)
Sam
pl
e ty
pe
Ala
- ch
lor
(H9/
I-)
Ala
- ch
lor
ESA
Am
e-
tryn
Atr
a-
zine
DEA
DI
A (n
g/L)
(u
g/L)
Cya
n-
azin
e
Cya
n-
azin
e am
ide
(H9/
I-)
De-
et
hyl-
cy
an-
azln
e
De-
et
hyl-
cy
an-
azin
e am
ide
Met
ol-
achl
or
(WI/L
)
Met
ri-
buzi
n (H
9/I-)
Prom
e-
ton
Prop
a-
zine
Sim
a-
zine
(H
9/I-)
Illin
ois
1 C
arly
le L
ake
04/3
0/92
06/2
4/92
08/2
5/92
10/2
1/92
01/1
3/93
03/3
0/93
07/1
5/93
09/2
0/93
2 C
rab
Orc
hard
Lak
e 05
/01/
9206
/25/
92
08/2
7/92
10/2
2/92
01/1
5/93
03/2
6/93
07/0
7/93
09/2
1/93
3 D
evils
Kitc
hen
Lak
e 05
/01/
9206
/25/
92
08/2
7/92
08/2
7/92
10/2
2/92
01/1
5/93
01/1
5/93
03/2
6/93
07/0
7/93
09/2
1/93
S S S s s s s s s s s s s s s s s s s LD S S LD S S S
0.28 .0
5<.
05
<.05
<.05
<.05 .1
2
<.05
<.05
<.05
<.05
<.05
<.05
<.05 .0
6
<.05
<.05 .0
8
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
0.56
1.0 .69
.89
1.0 .5
4
.94
2.2 .1
3
.34
.11
.24
.26
.29
.28
.64
<.10
<.10 .2
1 <.
10
<.10
_ <.10
<.10 .2
8
<0.0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
5.0
5.8
3.9
2.6 .8
0
.29
4.3
2.5 .2
4
.51
.16
.49
.29
.17
.86
1.5 .0
7.2
7
<.05
<.05 .0
8
<.05
<.05
<.05 .4
0
.39
0.49 .8
5
.70
.56
.30
.11
.77
.73
.08
.12
<.05 .1
4
.09
<.05 .1
4
.28
<.05 .0
8
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
0.40 .6
0
.33
.38
.13
.08
.67
.43
.06
.06
<.05 .0
6<.
05
<.05 .0
7
.11
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
1.0
1.0 .54
.41
.09
<.05
1.1 .4
7
<.05 .1
0
<.05
<.05
<.05
<.05 .2
2
.28
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
0.54
.28
.25
-- <.05
.04
<.05
_ <.05
<.05
<.05
<.05 .0
8
<.05
<.05
-- <.05
<.05
<.05
-- _ <.05
<.05
<.05
0.10
.11
.12
- <.05
<.05
<.05
_ <.05
<.05
<.05
<.05
<.05
<.05
<.05
- <.05
<.05
<.05
- _ <.05
<.05
<.05
<0.5
0 <.
50
<.50
- <.50
<.50
<.50
_ <.50
<.50
<.50
<.50
<.50
<.50
<.50
-- <.50
<.50
<.50
- _ <.50
<.50
<.50
1.4 .8
4
.18
.10
.15
.10
.71
.27
<.05
<.05
<.05
<.05
<.05
<.05 .1
0
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
0.07
<.05
<.05
<.05
<.05 .0
7<.
05
<.05
<.05
<.05
<.Q
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<0.0
5
<.05
<.05
<.05
<.05
<.05 .0
5
<.05
<.05
<.05
<.05 .0
5.0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<0.0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<,05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
1.2
1.4 .72
.44
<.05
<.05 .8
1
.39
<.05
<.05
<.05
<.05
<.05
<.05 .0
5
.06
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
Tabl
e 5.
A
naly
tical
res
ults
for
sele
cted
her
bici
des
and
six
met
abol
ites
in s
ampl
es c
olle
cted
from
76
rese
rvoi
rs in
the
Mid
wes
tern
Uni
ted
Sta
tes,
Apr
il 19
92 th
roug
h S
epte
mbe
r 19
93 C
ontin
ued
I i 6* ! u S 3
Map
no
. (f
ig. 1
) R
eser
voir
nam
e
Dat
e of
co
llec
tio
n (m
onth
/ da
y/ye
ar)
Sam
pl
e ty
pe
Ala
- ch
lor
(Ml/L
)
Ala
- ch
lor
ESA
(M
l/L)
Am
e-
tryn
(M
l/L)
Atra
- zi
ne
(Ml/L
)D
EA(M
I/L)
DIA
(Ml/L
)
Cya
n-
azln
e (M
l/L)
Cya
n-
azin
e am
ide
(Ml/L
)
De-
et
hyl-
cy
an-
azin
e (M
l/L)
De-
et
hyl-
cy
an-
azln
e am
ide
(Ml/L
)
Met
ol-
achl
or
(Ml/L
)
Met
ri-
buzi
n (M
l/L)
Prom
e-
ton
(MI/L
)
Prop
a-
zine
(MI/L
)
Sim
a-
zlne
(M
I/L)
Illin
ois C
onti
nued
4 L
ake
Dec
atur
5 L
ake
Shel
byvi
lle
6 L
ake
Ver
mill
ion
04/3
0/92
07/0
7/92
09/0
1/92
09/0
1/92
10/2
0/92
10/2
0/92
01/1
4/93
03/2
4/93
03/2
4/93
07/0
7/93
09/0
9/93
04/3
0/92
07/0
7/92
08/2
5/92
08/2
5/92
10/2
0/92
01/1
4/93
03/2
6/93
07/1
2/93
07/1
2/93
09/0
8/93
04/3
0/92
07/0
7/92
07/0
7/92
07/0
7/92
07/0
7/92
S S S LD
BD
S S S BD
S S S S S BD
S S S S LD S S S LD BD
LD
0.06 .1
2<.
05
<.05
<.05
<.05
<.05
<.05
<.05 .5
9
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05 .2
0
.07
.07
.11
.25
.26
.26
.23
0.33
1.2
1.9
1.9
1.1
1.0
1.1 .8
0
.63
4.9
3.4 .4
5
.46
1.1
-
.78
1.1 .5
3
.93
-- 1.3 .9
22.
9- 2.
9
<0.0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
0.58
2.7 .9
2
.91
.69
.54
.36
.14
.15
5.5 .6
8
1.4
1.7
1.8
1.8
1.6 .50
.18
1.9
1.1
2.1 1.8
5.3
6.1
5.2
5.7
0.08 .3
9.3
3
.33
.26
.22
.16
.07
.08
1.2 .3
4
.45
.43
.49
.45
.48
.27
.10
.32
.19
.56
.17
1.1 .9
4
1.1 .8
5
0.07 .1
9
.17
.14
.13
<.05 .0
6
.05
.05
1.3 .2
6
.24
.26
.27
.26
.26
.13
.08
.21
.16
.38
.22
.75
.69
.81
.61
0.19 .7
5
.25
.15
<.05
<.05
<.05
<.05
<.05
2.8 .1
2
.30
.41
.46
.47
.43
<.05
<.05 .6
7
.65
.66
1.3
4.4
7.5
4.3
5.1
0.07 .4
4
.26
.30
.22
.26
-- <.05
<.05
2.2 .3
1
.27
.31
.42
.43
.60
<.05 .1
2-
.13
.10
3.3
4.1
2.8
<0.0
5
.13
<.05
<.05 .0
5
.05
- <.05
<.05 .2
0
<.05
<.05 .1
6
.13
.13
.15
.. <.05 .0
9--
.10
.09
.81
.91
.71
<0.5
0<.
50
<.50
<.50
<.50
<.50
- <.50
<.50 .42
<.50
<.50
<.50
<.50
<.50 .36
<.50
<.50
-- <.50
<.50
1.1 <.50
1.0
0.95
1.1 .3
8
.39
.22
.17
.30
.18
.21
2.8 .3
3
.10
.26
.35
.34
.28
.19
.14
1.3 .6
2
.70
.80
.74
.63
.75
.56
<0.0
5<.
05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05 .0
9
<.05 .0
9
0.09 .0
6
<.05
<.05 .0
6
<.05
<.05
<.05
<.05
<.05 .0
6
<.05
<.05 .0
6
.05
.07
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<0.0
5<.
05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05 .0
5
.05
.69
.05
<0.0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05 .0
5
<.05 .2
8
.32
.15
.14
.09
<.05
<.05 .1
3
.05
.11
<.05
<.05
<.05
<.05
<.05
Tabl
e 5.
A
naly
tical
res
ults
for
sele
cted
her
bici
des
and
six
met
abol
ites
in s
ampl
es c
olle
cted
from
76
rese
rvoi
rs in
the
Mid
wes
tern
Uni
ted
Sta
tes,
Apr
il 19
92 th
roug
h S
epte
mbe
r 19
93 C
ontin
ued
ncentrations
o * 9 (D O S a. X (D 3- o°
5! (D JO X (D 3- o' a (D (D sr o- I w 0) 3 a. z c 5' 5f 5' O 1 3 w 3T a (D a. S 1 w 8f 3 3D (D <g (D 2.
55
Dat
e of
co
l lee
- M
ap
tion
no.
(mon
th/
(fig
. 1)
Res
ervo
ir n
ame
day/
year
)
Sam
pl
e ty
pe
Ala
- ch
lor
Ala
- ch
lor
ESA
Am
e-
tryn
(H
9/L)
Atra
- zi
ne
(H9/
L)D
EA(H
9/L)
DIA
Cya
n-
azin
e
Cya
n-
azin
e am
ide
(H9/
L)
De-
et
hyl-
cy
an-
azin
e (H
9/L)
De-
et
hyl-
cy
an-
azin
e am
ide
Met
ol-
achl
or
(H9/
L)
Met
ri-
buzi
nPr
ome-
to
n(M
9/L)
Prop
a-
zine
(H
9/L)
Sim
a-
zine
Illin
ois C
onti
nued
6 La
ke V
erm
illi
on
08/2
8/92
Con
tinue
d 10
/21/
9201
/13/
93
03/1
7/93
07/0
6/93
07/0
6/93
09/0
2/93
7 Li
ttle
Gra
ssy
Lake
05
/01/
92
06/2
5/92
08/2
7/92
10/2
2/92
01/1
5/93
03/2
6/93
07/0
7/93
09/2
1/93
8 R
end
Lake
04
/30/
92
04/3
0/92
06/2
4/92
08/2
4/92
10/2
1/92
01/1
1/93
03/2
4/93
07/0
7/93
09/2
0/93
S S S S S LD S S S S S S S S S S LD S S S S S S S
<0.0
5
<.05
<.05
<.05 .1
5
.15
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05 .1
3
<.05
<.05
<.05
<.05 .0
5
<.05
1.9 .59
.73
.75
2.9
3.1 1.3
<.10
<.10
<.10
<.10
<.10
<.10
<.10 .3
4
.30
.34
.71
.56
.50
.36
.38
.38
.87
<0.0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
1.4 .70
.45
.35
4.7
5.1 .9
5
.09
.15
.12
.12
.10
.07
.14
.39
.38
.37
4.3
1.1 1.0 .7
41.
3 .77
1.3
0.43 .3
1.2
4
.17
1.5
1.5 .4
2
<.05 .0
5
.05
.06
.06
<Lfti
<.05 .0
6
.15
.14
.27
.22
.26
.19
.13
.19
.34
0.36 .3
2.2
1
.23
1.6
1.6 .5
5
<.05
<.05
<.05
<.05
<.05
<JQ5
_<.
05<.
05 .13
.12
.17
.11
.16
.09
.08
.13
.28
0.44 .3
2
.10
.14
4.3
4.4 .2
8
<.05
<.05
<.05
<.05
<.05
<OS
<.05
<.05 .1
8
.17
.28
.35
.34
.14
.19
.69
.93
1.3 .7
2-
.15
3.7
4.0 .5
4
<.05
-- <.05
<.05
<.05
<:.0
5
<.05
<.05 .1
0
.10
-
.29
.23
.35
.14
<.05 .4
1
0.12 .0
9- <.
05 .17
.18
.07
<.05
- <.05
<.05
<.05
<05
<.05
<.05
<.05
<.05
-
.09
.12
.07
<.05
<.05 .1
1
<0.5
0
.33
~ <.50
<.50
<.50
<.50
<.50
- <.50
<.50
<.50 <^a
<.50
<.50
<.50
<.50
- <.50
<.50
<.50
<.50
<.50
<.50
0.18 .1
0
.12
.56
1.3
1.4 .2
0
<.05
<.05
<.05
<.05
<.05
<Q
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05 .0
6
<.05
<0.0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<0.0
5
.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
-tOS-
<.05
<.05
<.05
<.05 .1
5
<.05
<.05
<.05
<.05
<.05
<.05
<0.0
5
<.05
<.05
<.05
<.05 .0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<0.0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05 .0
8
.09
.06
<.05 .0
6
.10
.17
Tabl
e 5.
A
naly
tical
res
ults
for
sel
ecte
d he
rbic
ides
and
six
met
abol
ites
in s
ampl
es c
olle
cted
fro
m 7
6 re
serv
oirs
in t
he M
idw
este
rn U
nite
d S
tate
s, A
pril
1992
thr
ough
Sep
tem
ber
19
93
Co
ntin
ue
d
Map
no
. (f
ig. 1
) R
eser
voir
nam
e
Dat
e of
co
llec
tio
n (m
onth
/ da
y/ye
ar)
Sam
pl
e ty
pe
Ala
- ch
lor
(H9/
L)
Ala
- ch
lor
ESA
(H
9/L)
Am
e-
tryn
(H
9/L)
Atr
a-
zine
(H
9/L)
DEA
(WJ/L
)D
IA(H
9/L)
Cya
n-
azin
e (H
9/L)
Cya
n-
azln
e am
ide
(H9/
L)
De-
et
hyl-
cy
an-
azin
e (H
9/L)
De-
et
hyl-
cy
an-
azin
e am
ide
(H9/
L)
Met
ol-
achl
or
(H9/
L)
Met
ri-
buzi
n (H
9/L)
Prom
e-
ton
(H9/
L)
Prop
a-
zine
(H
9/L)
Sim
a-
zine
(H
9/L)
Indi
ana
9 B
rook
ville
Lak
e
10
Cat
arac
t L
ake
11
Eag
le C
reek
Res
ervo
ir
05/0
7/92
05/0
7/92
07/1
3/92
08/1
9/92
10/2
3/92
01/0
6/93
03/2
4/93
07/0
8/93
09/0
7/93
05/0
4/92
05/0
4/92
07/1
1/92
08/2
4/92
10/2
1/92
01/1
4/93
03/2
2/93
07/0
7/93
09/0
2/93
05/0
4/92
07/0
6/92
08/2
7/92
10/2
7/92
01/0
7/93
03/2
9/93
07/0
8/93
07/0
8/93
09/0
3/93
09/0
3/93
S BD
S S S S S S S S LD
S S S S S S S S S S S S S S BD
S BD
0.09 .0
9
.09
<.05 .1
3
.06
<.05 .2
1
.60
.05
.05
.08
<.05
<.05
<.05
<.05 .4
4
<.05 .1
0
.22
.11
.05
.07
.06
.10
.11
<.05
<.05
0.81 .7
5
1.1 .8
0
1.1
1.8 .7
9
1.1
3.1 .5
6
.59
.88
.91
.44
.34
.45
2.3 .8
5
2.3
1.3
1.8
1.6 .5
7
.62
1.3
1.2
2.3
2.5
<0.0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
1.6
1.6
1.3 .1
9
1.9
1.4 .5
6
1.5
2.4
2.6
2.6
3.0
2.2
1.8 .2
3
.25
11 2.2
2.8
3.5
2.7
1.5 .2
9
.21
3.6
3.5
2.2
2.2
0.49 .5
0
.32
.05
.47
.48
.20
.31
.36
.38
.37
.42
.76
.63
.19
.15
2.6 .7
6
.43
.64
.62
.52
.16
.13
.79
.78
.78
.77
0.40 .4
0
.17
<.05 .2
7
.22
.08
.14
.19
.17
.17
.32
.45
.26
.09
.05
1.6 .4
0
.27
1.0 .3
9
.32
.09
.07
.40
.41
.52
.51
0.62 .6
3
.37
<.05 .4
5
.27
.10
.29
.46
.11
.12
.37
.28
.26
<.05
<.05
3.8 .5
7
.63
1.1 .7
6
.28
<.05
<.05
1.7
1.6 .87
.87
0.19 .2
0
.24
<.05 .2
0
.24
<.05 .1
4
.12
<.05
<.05 .2
1
.49
.30
.. <.05
1.8 .2
7
.15
.30
.47
.17
<.05
<.05 .7
8
.77
.29
.32
0.12 .1
8
.11
<.05 .1
1
.11
<.05 .0
9
<.05
<.05
<.05
<.05
<.05 .0
8
.. <.05 .2
9
.08
<.05 .1
2
.12
.08
<.05
<.05 .2
5
.21
.12
<.05
<0.
50
<.50
<.50
<.50
<.5
0
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
.. <.5
0
<.5
0
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
0.20 .2
0
.17
<.05 .2
8
.25
.05
.35
.61
1.4
1.4 .9
9
.68
.39
.17
.12
4.6 .7
1
2.3
2.0
1.4 .4
7
.28
.28
2.3
2.2
1.1
1.1
<0.0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05 .1
7
<.05
<.05 .0
5
.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<0.0
5
<.05
<.05
<.05
<.05 .0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05 .0
7
.15
.14
<.05
<.05 .0
6
.06
.07
.07
<0.0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05 .1
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
0.08 .8
6
.09
<.05 .1
4
.14
<.05 .0
8
.11
.11
.11
.21
.21
.15
<.05
<.05 .4
8
.18
.10
.36
.27
<.05
<.05
<.05 .2
6
.27
.22
.21
g
Tabl
e 5.
A
naly
tical
res
ults
for
sele
cted
her
bici
des
and
six
met
abol
ites
in s
ampl
es c
olle
cted
from
76
rese
rvoi
rs in
the
Mid
wes
tern
Uni
ted
Sta
tes,
Apr
il n
19
92 th
roug
h S
epte
mbe
r 19
93 C
ontin
ued
= 3
d tt
* §
to
O31
(o
tn i
b.
Is.
H §
go a S (D X 5. o f !
Dat
e o
f co
dec-
Map
tio
n
Sam
-no
, (m
onth
/ pi
e(f
ig.
1)
Res
ervo
ir na
me
day/
year
) ty
pe
Ala
-ch
lor
(MJ/
L)
Ala
-ch
lor
ES
A(H
9/L)
Am
e-tr
yn(H
9/L)
Atr
a-zl
ne(H
9/L)
DE
A(H
9/L)
DIA
(H9/
L)
Cya
n-az
ine
(H9/
L)
Cya
n-az
ine
amid
e(H
9/L)
De-
et
hyl-
cyan
-az
ine
(H9/
L)
De-
et
hyl-
cyan
-az
ine
amid
e(H
9/L)
Met
ol-
achl
or(H
9/L)
Met
ri-bu
zin
(H9/
L)
Pro
me-
ton
(H9/
L)
Pro
pa-
zine
(H9/
L)
Sim
a-zi
ne(M
9«-)
Ind
ian
a C
on
tinu
ed
12
Hun
tingt
on L
ake
05/0
5/92
S
07/1
4/92
S
07/1
4/92
L
D
08/2
6/92
S
OS
/26/
92
BD
10/2
7/92
S
10/2
7/92
L
D
01/1
1/93
S
03/2
3/93
S
07/0
9/93
S
0.22
1.1
1.3 .05
.05
.05
.06
.06
.05
1.3
4.8
15 13 5.8
5.6
4.6
4.4
2.5
1.3
11
<0.0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
1.1
6.1
6.4
1.2
1.2 .4
2
.43
.36
.22
7.7
0.30
1.3
1.5 .4
5
.48
.35
.35
.26
.12
2.5
0.21 .8
7
.96
.26
.30
.15
.14
.11
.05
2.0
0.42
2.6
2.8 .4
9
.59
.17
.10
<.05
<.05
3.7
0.15
1.3
1.6
1.2
1.2
<.05 .1
8
<.05 .1
0
3.6
<0.0
5
<.05 .3
1
.13
.11
<.05 .0
6
<.05
<.05 .3
3
<0.5
0
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
0.67
3.4
3.5 .4
3
.45
.30
.31
.25
.35
4.3
0.08 .3
8
.42
<.05
<.05
<.05
<.05
<.05 .0
7
.67
<0.0
5
.11
.11
.09
.09
<.05
<.05
<.05
<.05
<.05
<0.0
5
.08
.08
<.05
<.05
<.05
<.05
<.05
<.05 .1
0
<0.0
5
.26
.28
.05
.05
<.05
<.05
<.05
<.05 .1
9
09/1
6/93
S
.12
5.9
<.05
1.3
.40
.32
.82
.74
<.05
<.50
.62
<.05
.12
<.05
.05
13
Lake
Sha
fer
14
Man
sfie
ld L
ake
39 O
w 5 o
05/0
5/92
S07
/14/
92
S
07/1
4/92
08/2
6/92
10/2
6/92
01/1
2/93
03/2
3/93
07/1
2/93
09/0
3/93
09/0
3/93
05/0
4/92
07/1
1/92
08/2
4/92
10/2
1/92
01/1
2/93
BD
S S S S S S LD S S S S S
.08
.18
.23
<.05
<.05
<.05
<.05 .1
1.0
9.0
8
.12
.12
.08
<.05
<.05
3.1
5.4
4.6
2.4
2.2
<.10
2.5
3.6
6.2
6.1 1.0 .82
1.9 .6
8
<.10
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
.35
L5 1.0 .19
.17
.20
.10
1.1 .4
3
.45
1.6
2.3
1.8
1.6 .4
1
.09
.33
.29
.06
.10
.08
.06
.33
.22
.23
.29
.30
.53
.57
.20
.06
.16
.15
<.05 .0
6
<.05
<.05 .1
9.1
2
.12
.20
.16
.31
.28
<.05
.12
.31
.19
<.05
<.05
<.05
<.05 .2
3.1
6.1
6
.21
.21
.19
.19
<.05
<.05 .1
3.2
7
.12
.08
<.05
--
.09
.10
.05
.12
.26
.18
<.05
<.05 .1
0
<.05
<.05
<.05
-- <.05
<.05
<.05
<.05
<.05 .0
7
<.50
<.50
<.50
<.50
<.50
<.50
- <.50
<.50
<.50
<.50
<.50
<.50
.07
.27
.31
<.05 .0
5
<.05 .1
8
.19
.44
.45
.65
.62
.57
.34
.21
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05 .0
5
.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05 .1
0
.09
.05
<.05
<.05
<.05 .0
9
<.05
<.05 .1
2
.24
.16
.11
<.05
Tabl
e 5.
A
naly
tical
res
ults
for s
elec
ted
herb
icid
es a
nd s
ix m
etab
olite
s in
sam
ples
col
lect
ed fr
om 7
6 re
serv
oirs
in th
e M
idw
este
rn U
nite
d S
tate
s, A
pril
1992
thro
ugh
Sep
tem
ber
1993
Con
tinue
d
Dat
e of
code
c-M
ap
tion
no.
(mon
th/
(fig
. 1)
R
eser
voir
nam
e da
y/ye
ar)
Sam
pl
ety
pe
Ala
-ch
lor
(H9/
L)
Ala
-ch
lor
ES
A(H
9/L)
Am
e-tr
yn(n
g/L)
Atr
a-zi
ne(H
9/L)
DE
A<n
g/L)
DIA
(ng/L
)C
yan-
azin
efog
/i-)
Cya
n-az
ine
amid
e(n
g/i-)
De-
ethy
l-cy
an-
azin
e0»
9/L)
De-
et
hyl-
cyan
-az
ine
amid
e(n
g/L)
Met
ol-
achl
or(H
9/L)
Met
ri-bu
zin
(ng/L
)P
rom
e-to
n(n
g/L)
Pro
pa-
zine
(H9/
L)
Sim
a-zi
ne(H
9/L)
India
na C
ontin
ued
i s S a. ? S c ?
14
Man
sfie
ld L
ake
01/1
2/93
Con
tinue
d 01
/12/
93
03/2
2/93
07/1
0/93
07/1
0/93
BD
LD S S LD
<0.0
5
<.05
<.05 .1
7
.17
<0.1
0_
.64
.95
1.0
<0.0
5
<.05
<.05
<.05
<.05
0.42 .4
3
.30
4.2
4.2
0.20 .2
1
.17
.75
.74
<0.0
5
.05
.06
.28
.28
<0.0
5
<.05
<.05 .6
9
.72
_ _ <0.0
5
.28
.29
_ _ <0.0
5
<.05
<.05
_ _ <0.5
0
<.50
<.50
0.21 .2
2
.19
1.9
1.9
<0.0
5
<.05
<.05
<.05
<.05
<0.0
5
<.05
<.05
<.05
<.05
<0.0
5
<.05
<.05
<.05
<.05
<0.0
5
<.05
<.05
<.05
<.05
09/1
5/93
S
.06
2.4
<.05
3.4
1.1
.68
.56
.48
.08
<.50
.84
<.05
<.05
<.05
<.05
15
Mis
siss
inew
a L
ake
tt a
to x <§ w 9 TO
16
Mon
roe
Lak
e
05/0
4/92
07/1
4/92
08/2
6/92
08/2
6/92
10/2
6/92
01/1
1/93
03/2
3/93
07/0
9/93
09/1
5/93
05/0
6/92
07/0
7/92
08/2
5/92
10/2
1/92
10/2
1/92
01/1
3/93
03/2
5/93
07/0
8/93
09/0
1/93
S S S LD S S S S S S S S S BD
S S S S
.56
2.7 .3
5
.34
.05
<.05
<.05
1.5 .2
4
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
3.0
8.4
6.1
5.8
2.2
1.7 .9
49.
4
12 <.10
<.10
<.10
<.10
<.10
<.10 .1
5<.
10 .15
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
3.9
11 4.2
4.1 .6
6
.23
.25
8.0
4.3 .0
6
.09
.12
.12
.12
.10
<.05 .0
6
.23
.42
1.7
1.4
1.3 .5
2
.17
.32
2.0
1.4
<.05
<.05
<.05
<.05
<.05 .0
5
<.05
<.05 .0
5
.30
1.2 .8
6
.76
.27
.10
.07
1.6
1.1
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
1.7
5.1
2.0
1.7 .1
2
.06
<.05
5.8
2.5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
.25
3.2
1.9
1.2 .1
6
..
.05
3.0
1.7
<.05
<.05
<.05
<.05
<.05
<.05 .0
6
<.05 .3
2
.28
.18
<.05
<.05 .4
5
.26
_. <.05
<.05
<.05
<.05
_. <.05
<.05
<.05
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
2.1
4.9
1.8
1.7 .3
0
.14
.14
4.0
1.4
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
.54
.67
.12
.11
<.05
<.05 .0
9<.
05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05 .0
5
.05
.05
.05
<.05
<.05
<.05 .0
6
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05 .1
3.0
5
<.05
<.05
<.05
<.05 .0
9
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
.88
.80
.24
.22
<.05
<.05
<.05 .6
5.2
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
Tabl
e 5.
A
naly
tical
res
ults
for
sele
cted
her
bici
des
and
six
met
abol
ites
in s
ampl
es c
olle
cted
from
76
rese
rvoi
rs in
the
Mid
wes
tern
Uni
ted
Sta
tes,
Apr
il
> o
o o = 3
tO 3
83
1 f § O
CO
<|a 0)
o> <
b »
5"
11 cr -
rS
|(0
O
W
Q.
(0 CO 1 o s- z §
i &
</c
- uii
wu^ii
v_
»\sj
jit>
i I i
ut>
i i
<7<?
tj
Dat
e of
code
c-M
ap
tion
no.
(mon
th/
(fig
. 1)
Res
ervo
ir n
ame
day/
year
)
' v
svsi
i
Sam
pl
ety
pe
III
IUV
*V
J
Ala
-ch
lor
(jig
/L)
Ala
-ch
lor
ESA
(|xg/
L)
Am
e-tr
yn(|i
g/L)
Atra
-zi
ne(n
g/L)
DEA
(ng/
L)D
IA(n
g/L)
Cya
n-az
ine
(WJ/L
)
Cya
n-az
ine
amid
e(n
g/L)
De-
ethy
l-cy
an-
azin
e(H
9/L)
De-
et
hyl-
cyan
-az
ine
amid
e(n
g/L)
Met
ol-
achl
or(n
g/L)
Met
ri-bu
zin
(ng/
L)
Prom
e-to
n(ng
/L)
Prop
a-zi
ne(H
9/L)
Sim
a-zi
ne(M
9/L)
Indi
ana C
onti
nued
17
Mor
se R
eser
voir
05
/07/
92
07/0
6/92
08/2
5/92
08/2
5/92
10/2
7/92
01/0
7/93
03/2
9/93
03/2
9/93
03/2
9/93
07/0
9/93
S S S LD S S S BD
LD S
0.59
3.4 .1
5.1
7
.14
.10
.06
.06
.07
.57
2.8
11 7.5
7.3
3.1 1.8
1.3
- 1.6
6.2
<0.0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
4.0
12 2.1
2.3
1.6 .25
.26
.24
.27
4.4
0.57
1.5 .6
8
.73
.53
.15
.14
.13
.15
1.1
0.37
1.2 .3
6
.36
.22
.06
<.05
<.05 .0
5
.57
0.96
1.2 .28
.33
.19
<.05
<.05
<.05
<.05 .6
8
0.17 .1
8
.20
.17
- <.05
<.05
<.05 .8
0
<0.0
5
.06
.08
.06
-- <.05
<.05
<.05 .1
4
<0.5
0
<.50
<.50
<.50
-- <.50
<.50
<.50
<.50
2.8
5.3 .6
8
.77
.41
.27
.21
.20
.22
2.1
0.10 .2
5<.
05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<0.0
5
.08
.07
.07
.06
<.05
<.05
<.05
<.05 .1
0
<0.0
5
.14
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<0.0
5
.07
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
09/0
3/93
S
.07
10<.
052.
7.9
5.5
0.3
0.2
5<.
05<.
50.9
8<.
05.0
9<.
05<.
05
18
Pato
ka L
ake
3 O 3 i s
05/0
6/92
05/0
6/92
07/0
7/92
07/0
7/92
08/2
5/92
10/2
2/92
01/1
3/93
03/2
5/93
03/2
5/93
07/1
3/93
S LD S LD S S S S LD S
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05 .0
5
<.10
<.
05
<.10
<.
05
<.10
<.
05
<.10
<.
05
<.10
<.
05
<.10
<.
05
<.10
<.
05
<.10
<.
05<.
10
<.05
.11
<.05
.11
.11
.13
.15
.12
.09
.08
.07
<.05 .1
9
<.05
<.05
<.05 .0
5<.
05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05 .0
5<.
05
<.05
<.05
<.05
<.05 .0
9
<.05
<.05
<.05
<.05
<.05 .0
9- <.
05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
-- <.05
<.05
<.50
<.50
<.50
<.50
<.50
<.50
-- <.50
<.50
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05 .0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
09/1
4/93
S
<.05
.29
<.05
.28
.07
.05
.06
<.05
<.05
<.50
.05
<.05
<.05
<.
05<.
05
19
Sala
mon
ie L
ake
05/0
5/92
S
07/1
4/92
S
08/2
6/92
S
10/2
6/92
S
01/1
1/93
S
.17
3.0 .7
0
.15
.08
4.4
17 11 7.6
2.6
<.05
<.05
<.05
<.05
<.05
.95
9.4
4.6
2.2 .3
1
.23
1.6
1.4 .8
9
.20
.14
1.0 .7
2
.48
.09
.30
4.4
2.8 .6
1
.10
<.05
2.0
1.8 .4
4~
<.05 .4
0
.21
.10
-
<.50
<.50
<.50 .3
7-
1.4
3.4
2.2 .5
9
.26
.16
.91
.26
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05 .1
1
.05
<.05
<.05
.05
.22
.09
.07
<.05
Tabl
e 5.
A
naly
tical
res
ults
for
sele
cted
her
bici
des
and
six
met
abol
ites
in s
ampl
es c
olle
cted
from
76
rese
rvoi
rs in
the
Mid
wes
tern
Uni
ted
Sta
tes,
Apr
il 19
92 th
roug
h S
epte
mbe
r 19
93 C
ontin
ued
Dat
e of
co
dec-
M
ap
tion
no.
(mon
th/
(fig.
1)
Res
ervo
ir na
me
day/
year
)
Sam
pl
e ty
pe
Ala
- ch
lor
(H9/
L)
Ala
- ch
lor
ESA
(H9/
L)
Am
e-
tryn
Atra
- zi
neDE
A DI
A(u
g/L)
(u
g/L)
Cya
n-
azin
e (u
g/L)
Cya
n-
azin
e am
ide
(ug/
L)
De-
et
hyl-
cy
an-
azin
e (u
g/L
)
De-
et
hyl-
cy
an-
azin
e am
ide
(ug/
L)
Met
ol-
achl
or
(ug/
L)
Met
ri-
buzi
n (u
g/L
)
Prom
e-
ton
(ug/L
)
Pro
pa-
zine
(ug/L
)
Sim
a-
zine
(ug/L
)In
dian
a C
ontin
ued
> 2. o" 31 i s 0 (0 2. § £ o 3- o Q.
0> 3
Q.
(0 X S i cr o_ > 1. i =5 i (Q 31
TJ S I CO
19
Sala
mon
ie L
ake
01
/11/
93C
ontin
ued
03/2
3/93
07/1
2/93
07/1
2/93
09/1
6/93
09/1
6/93
20
Cor
alvi
lle L
ake
04/2
9/92
06/3
0/92
06/3
0/92
08/2
4/92
10/1
9/92
01/2
0/93
03/2
4/93
07/1
6/93
07/1
6/93
09/0
1/93
21
Lake
Pan
oram
a 04
/30/
9204
/30/
9206
/30/
9208
/25/
9210
/16/
92
10/1
6/92
10/1
6/92
01/2
2/93
01/2
2/93
01/2
3/93
LD S S LD S LD S S LD S S S S S LD S S LD S S S BD
LD S BD
LD
0.07 .1
72.
92.
9 .63
.69
.08
<.05
<.05
<.05
<.05
<.05
<.05 .4
4.3
6<.
05 .08
.09
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
2.0
20 19 18 - 1.7
1.9
1.9
1.9
1.0
1.4 .58
4.7
4.6
3.7 .61 .4
8.3
4.9
5.3
8
.92
.85
.28
.34
.34
<0.0
5<.
05<.
05<.
05<.
05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
0.31 .6
89.
89.
95.
8
5.7 .2
5.2
3.2
4.3
7.2
3
.09
.35
3.8
3.6 .6
6
.16
.16
.21
.74
.36
.34
.34
.05
.05
.07
0.19 .5
51.
92.
3 1.6
1.6
Iow
a.1
3.1
2.1
2.1
9.1
7
.08
.14
.72
.71
.39
.06
.06
.08
.21 .18
.16
.18
.05
.05
.06
0.09 .2
31.
92.
0 1.4
1.5 .0
9.0
9.0
8.1
0.11 .0
5.0
6.5
2.5
1 .21 .06
.06
.07
.14
.16
.12
.13
.05
.05
.06
0.08 .0
94.
75.
23.
6
3.5 .1
5.0
6.0
6.0
8.0
6
<.05 .0
81.
61.
5 .11 .12
.12
.11 .29
.11 .09
.10
<.05
<.05
<.05
<0.0
5-- -- 2.
7
2.7 .1
0
.12
.21
.22
.08
.05
<.05
- _
.18
.05
.05
.12
.26
.16
.10
.19
<.05
<.05
<.05
<0.0
5-- --
.37
.37
<.05
<.05 .0
8
<.05 .0
6
<.05
<.05
-- <.05
<.05
<.05 .0
7
.07
.06
.05
.05
<.05
<.05
<.05
<0.5
0- - <.
50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
-- _ <.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
0.25 .7
5
4.3
4.4
1.8
1.8 .4
0
.17
.17
.16
.11
<.05 .1
8
1.5
1.4 .37
.47
.47
.10
.46
.16
.13
<.05
<.05
<.05
<.05
<0.0
5
<.05
1.2
1.3
<.05 .1
0
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<0.0
5
<.05 .0
5
.05
.12
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<0.0
5
<.05 .0
7
.08
.06
.06
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<0.0
5
<.05 .2
9
.29
.22
.22
<.05
<.05
<.05
<.05
<.05
<.05
<.05 .0
5
.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
Tabl
e 5.
A
naly
tical
res
ults
for
sele
cted
her
bici
des
and
six
met
abol
ites
in s
ampl
es c
olle
cted
fro
m 7
6 re
serv
oirs
in th
e M
idw
este
rn U
nite
d S
tate
s, A
pril
1992
thro
ugh
Sep
tem
ber
1993
Con
tinue
d
ncentrations
o ril
1992
Th
roue 'J
Jo>
eY
A
yr o
2 ?<§
0-
T
It
Jo Q
.W
Q
. 2 JO i o a o 1 S 1 CO 0) a z 3 sr 3 O §1 0 if 3 <£ I s. 2 I CO 1 I $ i
Dat
e of
co
l lee
- M
ap
tion
no.
(mon
th/
(fig.
1)
Res
ervo
ir na
me
day/
year
)
Sam
pl
e ty
pe
Ala
- ch
lor
Ala
- ch
lor
ESA
(M9/
L)
Am
e-
tryn
Atr
a-
zine
DEA
DIA
Cya
n-
azin
e (R
9/1-)
Cya
n-
azln
e am
ide
De-
et
hyl-
cy
an-
azin
e
De-
et
hyl-
cy
an-
azin
e am
ide
(M9/
L)
Met
ol-
achl
orM
etri-
bu
zin
(H9/
L)
Prom
e-
ton
Prop
a-
zlne
(M
9/L)
Sim
a-
zine
Iow
a C
ontin
ued
21
Lake
Pan
oram
a
03/2
2/93
Con
tinue
d 03
/22/
9307
/27/
9308
/31/
9308
/31/
93
22
Lake
Red
Roc
k 04
/30/
9207
/01/
9208
/25/
9208
/25/
9210
/13/
92
01/2
1/93
03/2
3/93
07/1
6/93
08/3
0/93
23
Rat
hbun
Lak
e 04
/30/
9204
/30/
9207
/02/
9207
/02/
9208
/12/
92
10/1
4/92
01/2
1/93
03/2
3/93
07/2
7/93
08/3
0/93
S BD S S LD S S S BD
S S s s s s BD
S BD
S S s s s s
<0.0
5
<.05 .1
0
<.05
<.05 .1
7
.11
<.05
<.05
<.05
<.05
<.05 .2
3
<.05 .0
5
<.05 .0
5
.05
.05
<.05
<.05
<.05 .1
2
.11
0.89 .7
1
1.6
1.1
1.1
1.2 .8
8
1.6
1.1
<.10 .7
3
.86
2.5
2,3
_
.55
.52
.55
.54
.84
.59
.57
.60
1.1
1.5
<0.0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.Q
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
0.44 .4
0
1.0 .35
.36
.60
.34
.49
.53
.69
.11
.49
2.8 JO 2.3
2.0
2.0
2.1
2.3
1.5
1.0 .98
2.6
3.5
0.12 .1
0
.29
.20
.21
.10
.08
.21
.18
.30
.08
.15
.47
.22
.46
.43
.45
.45
.47
.57
.34
.37
.46
.92
0.09 .0
7
.16
.18
.20
.09
.12
.18
.15
.19
.09
.10
.37
-.21..
.34
.30
.39
.33
.40
.38
.21
.23
.39
.75
0.11 .0
9.2
9.1
0.0
9
.33
.12
.21 .17
.20
<.05
<.05 1.4 ^ 1.8
1.5
2.3
2.4
2.0
1.4 .41
.64
2.6
4.1
0.07 .0
8
.12
.10
.11
.16
.28
.12
.36
.06
<.05
__J3 1.2
1.2 .8
6
.96
1.9
1.4 .5
0
.67
-- 2.2
<0.0
5
<.05
<.05
<.05
<.05 .1
1
.08
<.05 .0
6
<.05
<.05
<Q
5
.29
.20
.26
.27
.44
.18
.12
<.05
-
.24
<0.
50
<.50
<.50
<.5
0
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<JSQ
<.50
<.50
<.50
<.50
<.50
<.5
0
<.50
<.50
- <.50
0.24 .2
2
.42
.14
.16
.99
.30
.22
.20
.18
.08
.44
1.6 .41
.26
.22
.16
.16
.19
.16
.10
.07
.31
.56
<0.0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.Q
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<0.0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<J)S
<.05
<.05
<.05
<.05 .0
5
<.05
<.05
<.05
<.05
<.05
<0.0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<0.0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<J)5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
Tabl
e 5.
A
naly
tical
res
ults
for
sele
cted
her
bici
des
and
six
met
abol
ites
in s
ampl
es c
olle
cted
from
76
rese
rvoi
rs in
the
Mid
wes
tern
Uni
ted
Sta
tes,
Apr
il 19
92 t
hrou
gh S
epte
mbe
r 1993 C
ontin
ued
Dat
e of
co
llec-
M
ap
tion
Sam
- no
, (m
onth
/ pi
e (f
ig. 1
) R
eser
voir
nam
e da
y/ye
ar)
type
Ala
- ch
lor
(M9/
L)
Ala
- ch
lor
ESA
(ng/L
)
Am
e-
tryn
Atra
- zl
ne(ng
/L)
DEA
(M9/
L)DI
A(ng
/L)
Cya
n-
azin
e (H
9/L)
Cya
n-
azin
e am
ide
(H9/
L)
De-
et
hyl-
cy
an-
azin
e (M
9/L)
De-
et
hyl-
cy
an-
azln
e am
ide
Met
ol-
achl
or(H
9/L)
Met
ri-
buzl
n (M
9/L)
Prom
e-
ton
(M9/
L)
Prop
a-
zine
Sim
a-
zine
(M
9/L)
Iow
a C
ontin
ued
>
=> 0 -5 S o SL 3) » (0 c_ J* (0 o" w t a » 3- o" a (0 » a eo >? » I 5T 0) I i H 31
O c "S 5f | i w
24
Sayl
orvi
lle L
ake
04/3
0/92
S
06/3
0/92
S
08/2
5/92
S
08/2
5/92
L
D
10/1
6/92
S
01/2
2/93
S
03/2
2/93
S
07/1
6/93
S
08/3
1/93
S
0.07 .4
0<.
05
<.05
<.05
<.05
<.05 .2
9
<.05
0.50
2.8 1.4 .86
1.4
1.2 .8
5
3.3
3.7
<0.0
5<.
05<.
05
<.05
<.05
<.05
<.05
<.05
<.05
<0.0
51.1 .3
0
.31
.21
.08
.22
2.4 .7
1
<0.0
5.1
5
.12
.16
.10
<.05 .0
7
.32
.21
<0.0
5
.15
.13
.10
.11
.07
.06
.24
.16
<0.0
5
.37
.13
.10
.10
<.05
<.05 .8
6
.17
<0.0
5.2
4
.24
.32
.20
.05
<.05
--
.37
<0.0
5
.09
<.05 .0
6
.05
<.05
<.05
-- <.05
<0.5
0<.
50
<.50
<.50
<.50
<.50
<.50
- <.50
0.30
1.3 .1
6
.17
.10
.07
.25
1.7 .45
<0.0
5<.
05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<0.0
5<.
05<.
05
<.05
<.05
<.05
<.05
<.05
<.05
<0.0
5<.
05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<0.0
5<.
05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
Kan
sas
25
Clin
ton
Lak
e 05
/01/
92
S
06/2
6/92
S
08/2
4/92
S
10/2
6/92
S
01/1
9/93
S
03/2
2/93
S
07/1
3/93
S
08/3
0/93
S
26
Hill
sdal
e L
ake
05/0
5/92
S
06/2
5/92
S
08/2
8/92
S
08/2
8/92
LD
10/2
7/92
S
01/1
1/93
S
01/1
1/93
LD
03/2
3/93
S
07/2
9/93
S
08/3
1/93
S
<.05
<.05
<.05
<.05
<.05
<.05
<.05 .0
5
.12
.10
.05
.05
<.05
<.05
<.05
<.05 .2
1
.10
.22
.22
.55
.59
.38
.46
.17
1.7
1.0
1.4
1.1
1.0
1.5
1.1 1.1 .5
3
1.7
3.2
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
1.2
1.5
1.4
1.6
1.0 .6
7
1.0
1.2
2.6
3.0
2.4
2.5
2.6
1.6
1.8
1.1
2.6
2.0
.27
.30
.35
.38
.25
.20
.17
.24
.73
.60
.58
.63
.64
.39
.47
.33
.49
.41
.13
.12
.15
.15
.08
.07
<.05 .1
2
.49
.33
.27
.28
.26
.15
.20
.15
.21
.18
.08
.05
<.05
<.05
<.05
<.05
<.05
<.05 .0
9<.
05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05 .0
8<.
05
<.05
<.05 .0
5
<.05 .0
9
.09
<.05
<.05
<.05
<.05
-- <.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
- <.05
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
-- <.50
.14
.17
.13
.10
.07
<.05 .3
0
.30
.12
.76
.13
.13
.10
.06
.07
<.05 .2
4.1
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05 .0
6
<.05 .0
6
.07
<.05
<.05
<.05
<.05 .0
6
.05
Tabl
e 5.
A
naly
tical
res
ults
for
sele
cted
her
bici
des
and
six
met
abol
ites
in s
ampl
es c
olle
cted
from
76
rese
rvoi
rs in
the
Mid
wes
tern
Uni
ted
Sta
tes,
Apr
il
Concentrations
o Apr
il 1992
Throuj
CO
CO f
t *
5"
0 8
1* x
3
<D
o> z » X 3; 2 2 § | » 0 i. z 1 <D § 3 0 i i? 3 S i- S 2
T
I \3\j
c.
UM
VS
U^I
I v
j^|_
ri^ii
ii/
^i
i \j\
j\j
Dat
e of
co
llec-
M
ap
tlon
no.
(mon
th/
(fig
. 1)
Res
ervo
ir n
ame
day/
year
)
i vy
vsi
i
Sam
pl
e ty
pe
III
IUC
7U
Ala
- ch
lor
(MI/L
)
Ala
- ch
lor
ESA
Am
e-
tryn
(«i/L
)
Atra
- zi
neD
EADI
AC
yan-
az
ine
Cya
n-
azin
e am
ide
De-
et
hyl-
cy
an-
azin
e(ng
/L)
De-
et
hyl-
cy
an-
azin
e am
ide
Met
ol-
achl
or(M
I/L)
Met
ri-
buzi
n (W
I/L)
Prom
e-
ton
(W/L
)
Prop
a-
zine
Slm
a-
zine
(M
I/L)
Kan
sas C
onti
nued
27
Kan
opol
is L
ake
05/0
7/92
06/3
0/92
06/3
0/92
08/2
7/92
10/2
9/92
01/1
5/93
03/2
6/93
07/0
8/93
09/0
3/93
28
Milf
ord
Lak
e 05
/05/
92
06/2
9/92
08/2
5/92
08/2
5/92
10/2
9/91
01/1
3/93
03/2
4/93
07/1
9/93
09/0
1/93
29
Perr
y La
ke
05/0
1/92
06/2
6/92
08/2
8/92
10/2
6/92
10/2
6/92
S S LD
S S S S S S S S S LD s S S S S S S S S LD
<.05
<.05
<.05
<05
<.05
<.05
<.05 .0
6
<.05
<.05
<.05 .1
1-
.06
<.05
<.05 .3
4
.08
.05
.15
.11
<.05 .0
5
<.10
<.10
<.10
<.10
<.10
<.10
<.10 .1
0
.18
.51
.49
.73
.73
.68
.55
.55
1.1
1.3 .5
1
.95
1.9
1.4
1.4
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<JQ5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
.40
.75
.75
.94
.74
.59
.16
1.0 .7
4
4.0
2.7
1.8
- L9
1.7 .7
9
3.7
2.2
1.9
2.6
2.9
2.4
2.7
.11
<.05 .1
0
.17
.12
.10
<.05 .0
9
.14
.81
.67
.75
-
£1 .52
.23
.64
.61
.39
.39
.56
.46
.50
.15
.06
.08
.12
.07
.05
<.05
<.05 .1
0
.36
.25
.38
-
35 .29
.08
.31
.33
.18
.16
.27
.20
.20
<.05 .1
0
.08
.05
<.05
<.05
<.05 .0
6
<.05 .1
7
.09
<.05
- <.05
L
<.05
<05 .1
3
.06
.08
.11
.07
<.05
<.05
<.05
<.05
<.05 .0
7<.
05
<.05
<.05
<.05 .0
5
.12
.08
.09
--
.09
<.05
<.05
-
.07
<.05 .0
5
.11
<.05 .0
9
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
- <D5
<.05
<.05
-- <.05 .0
7<.
05
<.05
<.05
<.05
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
- <_5Q
<.50
<.50
- <.50
<.50
<.50
<.50
<.50
<.50
<.05 .1
6.1
6
.08
<.05
<.05
<.05 .2
1
.06
.28
.16
.62
-
AT
.36
.16
1.4 .81
.28
.45
.62
.40
.44
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
- <Q
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
.16
.12
.12
.08
.06
.06
<.05
<05
<.05
<.05
<.05 .0
7- ^0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05 .0
6<.
05
<.05
-- <.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
- <.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<D 3D
S I «
Tabl
e 5.
A
naly
tical
res
ults
for
sele
cted
her
bici
des
and
six
met
abol
ites
in s
ampl
es c
olle
cted
from
76
rese
rvoi
rs in
the
Mid
wes
tern
Uni
ted
Sta
tes,
Apr
il 19
92 th
roug
h S
epte
mbe
r 19
93 C
ontin
ued
Dat
e of
co
iiec-
M
ap
tion
no.
(mon
th/
(fig
. 1)
Res
ervo
ir n
ame
day/
year
)
Sam
- pi
e ty
pe
Ala
- ch
lor
(M9/
L)
Ala
- ch
ior
ESA
(M
9/L)
Am
e-
tryn
(n
g/L)
Atra
- zi
ne
(H9/
L)D
EA(M
9/D
DIA
Cya
n-
azin
e
Cya
n-
azin
e am
ide
De-
et
hyl-
cy
an-
azin
e
De-
et
hyl-
cy
an-
azin
e am
ide
Met
ol-
achl
orM
etri-
bu
zin
Prom
e-
ton
(M9/
L)
Prop
a-
zine
Sim
a-
zine
(M
9/L)
Kan
sas C
onti
nued
__ I CO c ff ? 9 a i 9 31
o" O.
0) a a> X 1 O1 o 1 0> > 1 i§ 3 <§ 31
§ O 1 <D S
29
Perr
y L
ake
01
/19/
93C
ontin
ued
03/2
2/93
07/2
5/93
08/3
0/93
30
Pom
ona
Lake
05
/05/
92
06/2
5/92
08/2
4/92
08/2
4/92
10/2
7/92
01/1
1/93
03/2
3/93
07/2
9/93
07/2
9/93
08/3
1/93
31
Turtl
e C
reek
Lak
e 05
/05/
92
06/2
9/92
08/2
5/92
10/3
0/92
01/1
3/93
03/2
4/93
07/1
9/93
09/0
1/93
32
Wac
onda
Lak
e 05
/06/
92
06/2
9/92
08/2
6/92
10/2
8/92
01/1
4/93
S S S S S S S LD S S S S LD S S S S S S S S S S S S S S
<0.0
5<.
05 .72
.28
<.05
<.05
<.05
<.05
<.05
<.05
<.05 .0
6
.06
<.05 .2
7
.75
.20
.09
<.05 .0
8
2.1 .4
1
<.05
<.05
<.05
<.05
<.05
0.63 .7
7
2.5
3.3 .1
4
.32
.41
.46
.47
.13
.24
.61
.63
1.2
2.1
3.2
2.7 1.4 .89
.91
6.2
4.7 .1
5
.18
.24
.30
.19
<0.0
5<.
05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05 .0
6<.
05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
0.95 .6
81.
8
1.8
1.9
1.8
2.3
2.5
2.5 .9
41.
7
2.1
2.2
2.2
1.7
4.2
2.0
1.6 .6
4
.48
.96
2.1 1.4
2.1
2.2
2.8
2.2
0.23 .1
9.5
8
.50
.41
.33
.44
.49
.47
.24
.49
.45
.49
.43
.80
.92
.82
.54
.23
.10
1.4 .9
6
.46
.55
.51
.60
.47
0.10 .0
8.2
7
.29
.31
.11
.20
.23
.18
.10
.18
.21
.22
.22
.43
.47
.47
.31
.10
.05
.70
.54
.19
.25
.26
.30
.20
<0.0
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05<.
05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05 .2
6
.36
.06
<.05
<.05
<.05 .1
6.1
2
.15
.19
.24
.29
.19
<0.0
5<.
05- <.
05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
-- - <.05 .1
6-
.11
.07
<.05
<.05
--
.11
.12
~
.15
.12
.20
<0.0
5
<.05
- <.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
- -- <.05
<.05
<.05
<.05
<.05
<.05
-- <.05
<.05
~
.09
.07
.07
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6
<.05
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Tabl
e 5.
A
naly
tical
res
ults
for
sele
cted
her
bici
des
and
six
met
abol
ites
in s
ampl
es c
olle
cted
from
76
rese
rvoi
rs in
the
Mid
wes
tern
Uni
ted
Sta
tes,
Apr
il
Concentrations
o Apr
il 1992
Throuc * e
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type
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- ch
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Am
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tryn
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tinue
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Tabl
e 5.
A
naly
tical
res
ults
for
sele
cted
her
bici
des
and
six
met
abol
ites
in s
ampl
es c
olle
cted
from
76
rese
rvoi
rs in
the
Mid
wes
tern
Uni
ted
Sta
tes,
Apr
il 19
92 th
roug
h S
epte
mbe
r 19
93 C
ontin
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no
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eser
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nam
e
Dat
e of
co
llec
tio
n (m
onth
/ da
y/ye
ar)
Sam
pl
e ty
pe
Ala
- ch
lor
(H9/
L)
Ala
- ch
lor
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(ng/L
)
Am
e-
tryn
(H
9/L)
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ne
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a-
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Min
neso
ta C
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35
Gul
l Lak
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ervo
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37
Leec
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03/2
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9/93
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1/92
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9/92
11/0
2/92
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6/93
S S S S S S S S S S LD S S S LD S S S S S S S S
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<.05
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Tabl
e 5.
A
naly
tical
res
ults
for
sele
cted
her
bici
des
and
six
met
abol
ites
in s
ampl
es c
olle
cted
from
76
rese
rvoi
rs in
the
Mid
wes
tern
Uni
ted
Sta
tes,
Apr
il 19
92 th
roug
h S
epte
mbe
r 19
93 C
ontin
ued
ncentrations
olD
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of
code
c-
Map
tio
n no
. (m
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/ (f
ig. 1
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voir
nam
e da
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Sam
pl
e ty
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tr
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(ng/
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(ng/
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ne
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40
Win
nibi
gosh
ish
05/1
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Res
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5-- <.
05
<.05 .1
2
<.05
<.05
<.05
<.05
-- <.05
<.05
<.05
<.05
<.05
<.05
<.05
-- <.05
<.05
<.05
<.05
<.05
<.05
-- <0.0
5-- <.
05
<.05
<.05
<.05
<.05
<.05
<.05
-- <.05
<.05
<.05
<.05
<.05
<.05
<.05
-- <.05
<.05
<.05
<.05
<.05
<.05
--
<0.5
0-- <.
50
<.50
<.50
<.50
<.50
<.50
<.50
-- <.50
<.50
<.5
0
<.50
<.50
<.50
<.50
-- <.50
<.50
<.50
<.50
<.50
<.50
<0.0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<0.0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<0.0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<0.0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<0.0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
Tabl
e 5.
A
naly
tical
res
ults
for
sel
ecte
d he
rbic
ides
and
six
met
abol
ites
in s
ampl
es c
olle
cted
fro
m 7
6 re
serv
oirs
in th
e M
idw
este
rn U
nite
d S
tate
s, A
pril
1992
thr
ough
Sep
tem
ber
19
93
Co
ntin
ue
d
Dat
e of
co
llec-
M
ap
tion
no.
(mon
th/
(fig
. 1)
R
eser
voir
nam
e da
y/ye
ar)
Sam
pl
e ty
pe
Ala
- ch
lor
(ng/
L)
Ala
- ch
lor
ES
AA
me-
tr
ynA
tra-
zi
ne(n
g/L)
DE
A
DIA
(ng/
L)
(ng/
L)
Cya
n-
azin
e(n
g/L)
Cya
n-
azin
e am
ide
(ng/
L)
De-
et
hyl-
cyan
- az
ine
De-
et
hyl-
cyan
- az
ine
amid
e(n
g/L)
Met
ol-
achl
or(n
g/L)
Met
ri-
buzi
nP
rom
e-
ton
(ng/
L)
Pro
pa-
zine
Sim
a-
zine
Min
neso
ta C
ontin
ued
SL o" SL 3J 8 sf 0*
CO o o § Q.
<0 3- o"
5."
CO a a. CO x" S a cr 0 8"* _ o _*.
<D
<D
10 H
3-
O c
ca 3-
£ 1 _*.
<D
<0
U
40
Win
nibi
gosh
ish
11/0
2/92
Re
serv
oir C
ontin
ued
11/0
2/92
01/0
6/93
03/1
6/93
07/1
4/93
09/2
2/93
41
Har
rison
ville
Lak
e 04
/28/
92
04/2
8/92
04/3
0/92
04/3
0/92
07/0
9/92
08/1
3/92
10/2
2/92
01/2
7/93
01/2
7/93
02/1
2/93
03/2
4/93
07/1
2/93
07/1
2/93
09/3
0/93
42
Har
ry S
Tru
man
05
/05/
92
Res
ervo
ir 07
/09/
92
08/2
5/92
10/1
4/92
01/1
2/93
S LD S S S S BD
S S LD
S S S S BD
S S S BD
S S S S S S
<0.0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05 .0
5
.10
.05
<.05
<.05
<0.1
0
<.10 <:!o <.10 .1
0
.13
.14
.20
.10
.11
<.10
<.10
<.10 .11 .1
5
.45
.81
.70
.53
.12
<0.0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05 .0
5
.06
.07
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<0.0
5
<.05
<.05
<.05
.05
<.05
3.6
3.8
3.5
3.4
3.2
1.2
1.2
1.2
1.1
3.7
4.0
2.0
1.3
2.7
1.2
1.1 .2
3
<0.0
5 <0
.05
<.05
<.
05
<.05
<.05
<.05
<.05
Mis
souri
.76
.33
.78
.87
.90
.38
.39
.13
.36
.65
.63
.41
.22
.30
.28
.22
<.05
<.05
<.05
<.05
<.05 .2
1
.22
.29
.32
.29
.10
.09
.10
.08
.25
.23
.14
.08
.13
.06
.08
<.05
<0.0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05 .0
5
<.05
<.05
<.05
<0.0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05 .0
8
<0.0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<0.5
0
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<0.0
5
<.05
<.05
<.05
<.05
<.05 .9
8
.94
.47
.35
.24
.14
.14
.11
.09
2.0
1.9 .7
4
.12
.24
.12
.09
<.05
<0.0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05 .1
0
<.05
<.05
<.05
<.05
<.05
<.05
<0.0
5
<.05
<.05
<.05
<.05
<.05
<.0
5
<.0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<0.0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05 .0
5
.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.0
5
<.0
5
<.0
5
<.0
5
<.0
5
<0.0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.0
5
<.05
<.05
<.05
<.05
§
Tabl
e 5.
A
naly
tical
res
ults
for
sele
cted
her
bici
des
and
six
met
abol
ites
in s
ampl
es c
olle
cted
from
76
rese
rvoi
rs in
the
Mid
wes
tern
Uni
ted
Sta
tes,
Apr
il
Concentrations o
April 1992
Throw 'c
oCO
»
« S
er ^
* c
rg
o 8s 8 X cr o Q
. 2 cr
o S CO D> Q.
t o 6? 3 O i 5 <? 8 2 1
o CO
<D 3D 8» i
Dat
e of
co
dec-
M
ap
tion
no.
(mon
th/
(fig
. 1)
Res
ervo
ir n
ame
day/
year
)
Sam
pl
e ty
pe
Ala
- ch
lor
Gig/L
)
Ala
- ch
lor
ESA
Am
e-
tryn
Atra
- zl
neD
EA
DIA
Gig/L
)
Cya
n-
azin
e
Cya
n-
azln
e am
ide
Gig/L
)
De-
et
hyl-
cyan
- az
lne
De-
et
hyl-
cyan
- az
ine
amid
eM
etol
- ac
hlor
Met
ri-
buzl
nPr
ome-
to
n G
ig/L
)
Prop
a-
zine
Sim
a-
zine
Mis
sour
i C
onti
nued
42
Har
ry S
Tru
man
01
/12/
93R
eser
voir
Con
tinue
d 03
/10/
93
06/1
6/93
09/1
7/93
43
Long
Bra
nch
Lake
05
/05/
92
05/0
5/92
07/1
5/92
08/2
4/92
10/2
1/92
10/2
1/92
10/2
1/92
01/0
7/93
03/2
2/93
03/2
2/93
07/0
1/93
09/2
3/93
09/2
3/93
44
Mar
k Tw
ain
Lake
05
/06/
92
07/1
5/92
07/1
5/92
08/2
4/92
08/2
4/92
10/2
2/92
01/0
7/93
01/0
7/93
03/2
2/93
06/2
3/93
LD S S S S LD S S S BD
LD S S LD S S BD
S S BD
S BD
S S LD S S
- <0.0
5
.14
.06
.05
.06
.05
.07
.05
.05
.06
<.05
<.05
<.05 .1
1
.07
.06
<.05 .0
5
.06
<.05
<.05 .0
5<.
05
<.05
<.05 .0
9
0.12 .1
1
.31
1.4
1.0
1.0 .9
7
.99
1.5
1.7
1.7
1.6 .9
0.9
9
.83
2.0
2.0
1.0 .8
2
.84
.70
.68
.51
1.2
1.3 .5
1
.66
-- <0.0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
- 0.24
1.5
1.8
1.1 1.2
1.5
2.1
2.5
2.3
2.6
1.7 .6
1.5
9
1.2
1.3
1.2
1.6
2.1 1.9
2.0
2.0
2.2
2.2
1.7 .8
6
1.6
~ 0.05 .1
3
.32
.20
.22
.24
.43
.54
.48
.55
.37
.20
.18
.17
.40
.37
.30
.33
.34
.35
.34
.38
.39
.30
.25
.25
-- <0.0
5<.
05 .13
.11
.20
.16
.11
.29
.27
.28
.17
.09
.08
.08
.30
.28
.19
.17
.17
.15
.16
.20
.17
.13
.13
.12
- <0.0
5<.
05
<.05 .5
7
.64
.86
.52
.83
.70
.85
.42
.20
.17
.95
.85
.83
.42
.42
.41
.36
.42
.38
.30
.20
.11
.40
- <0.0
5<.
05
<.05 .2
5
.24
.34
.53
.38
.35
.37
-- .16
.17
.32
.84
.91
.21
.21
.30
.24
.22
.17
.13
.05
.15
-- <0.0
5<.
05
<.05
<.05
<.05 .1
1
.14
.12
.11
.12
~ <.05
<.05 .0
7.0
9
.09
<.05
<.05 .0
7.0
8.0
6
.08
.06
- <.05
<.05
-- <0.5
0<.
50<.
50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
- <.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
- <.50
<.50
- <0.0
5.3
2
.30
.05
.06
.05
.07
.08
.07
.08
<.05
<.05
<.05 .1
1.1
2
.11
.19
.26
.26
.21
.23
.24
.18
.14
.09
.36
- <0.0
5<.
05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
- <0.0
5<.
05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
- <0.0
5<.
05<.
05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
- <0.0
5<.
05<.
05
<.05
<.05 .0
8
.07
<.05 .0
8<.
05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
09/1
5/93
S
.09
2.1
<.05
2.5
.67
.32
.70
.47
.07
<.50
.48
<.05
<.05
<.
05<.
05
Tabl
e 5.
A
naly
tical
res
ults
for
sele
cted
her
bici
des
and
six
met
abol
ites
in s
ampl
es c
olle
cted
from
76
rese
rvoi
rs in
the
Mid
wes
tern
Uni
ted
Sta
tes,
Apr
il 19
92 th
roug
h S
epte
mbe
r 19
93 C
ontin
ued
Dat
e of
co
llec-
M
ap
tion
no.
(mon
th/
(fig.
1)
Res
ervo
ir na
me
day/
year
)
Sam
pl
e ty
pe
Ala
- ch
lor
(M9/L
)
Ala
- ch
lor
ESA
(M9/
L)
Am
e-
tryn
Atra
- zi
ne(ng
/L)
DEA
(M9/
L)D
IAC
yan-
az
ine
(ng/L
)
Cya
n-
azin
e am
ide
De-
et
hyl-
cyan
- az
ine
De-
et
hyl-
cyan
- az
ine
amid
e(ng
/L)
Met
ol-
achl
or
(H9/
L)
Met
ri-
buzi
n (M
9/L)
Prom
e-
ton
Prop
a-
zine
(H
9/L)
Sim
a-
zine
(M
9/L)
Mis
sour
i C
ontin
ued
3 2L 1 3D 8 c sr 0 i 0 & X 3- 5' £ IB w 0> 3
Q. S' I 1 I 0 "^ 0 =: i =5 3 (Q 3"
? 3
45
Pom
me
de T
erre
Lak
e 05
/06/
9207
/08/
9208
/25/
9210
/14/
9201
/12/
93
03/1
0/93
03/1
0/93
06/1
6/93
09/1
7/93
09/1
7/93
46
Smith
ville
Lak
e 05
/05/
9205
/05/
9207
/07/
9207
/07/
9207
/07/
92
08/2
6/92
08/2
6/92
10/2
1/92
01/0
6/93
03/2
5/93
03/2
5/93
06/2
5/93
09/2
9/93
09/2
9/93
S S S S S S LD S S LD S BD S BD
LD S LD S S S BD S S LD
<0.0
5<.
05<.
05<.
05<.
05
<.05
<.05
<.05
<.05
<.05
<.05
- <.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05 .0
8<.
05<.
05
<0.1
0
<.10
<.10
<.10
<.10
<.10
<.10
<.10
<.10
<.10 .5
4.6
8.5
3.5
2.4
3
.50
.45
.53
.54
.43
.45
.38
.76
.99
<0.0
5<.
05<.
05<.
05<.
05
<.05
<.05
<.05
<.05
<.05
<.05
-- <.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<0.0
5.0
5.0
5.0
5<.
05
<.05
<.05
<.05
<.05
<.05
2.2
-- 2.9
2.9
3.1
3.1
3.6
2.9
2.5
1.5
1.4
1.7
2.3
2.1
<0.0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05 .6
1-- .5
0
.49
.57
.56
.68
.71
.49
.43
.41
.28
.46
.47
<0.0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05 .2
4-- .2
7
.27
.30
.23
.24
.25
.20
.19
.19
.11
.28
.27
<0.0
5<.
05<.
05<.
05<.
05
<.05
<.05
<.05
<.05
<.05 .6
9-- .4
4.4
6.5
9
.52
.87
.52
.39
.32
.31
.82
.77
.78
<0.0
5<.
05<.
05<.
05 <.
05<.
05<.
05<.
05<.
05 .45
-- .63
.48
.66
.43
.55
.42
.31
.24
.25
.30
.47
<.05
<.05
<.05
<.05
._ <.05
<.05
<.05
<.05
<.05
<.05
-- .13
.11 .13
.12
.14
.11 .11
<.05 .0
7.0
7.0
8
<0.5
0
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
-- <.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<0.0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05 .1
8-- .3
3.3
4.3
9
.28
.35
.26
.14
.11
.11
.35
.48
.49
<0.0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
- <.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05 .0
8<.
05
<.05
<.05
<0.0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
-- <.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<0.0
5<.
05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
-- <.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<0.0
5<.
05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05 .1
7- <.
05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
Tabl
e 5.
A
naly
tical
res
ults
for s
elec
ted
herb
icid
es a
nd s
ix m
etab
olite
s in
sam
ples
col
lect
ed fr
om 7
6 re
serv
oirs
in th
e M
idw
este
rn U
nite
d S
tate
s, A
pril
1992
thro
ugh
Sep
tem
ber
1993
Con
tinue
d
incentratlons o
Dat
e of
co
llec-
M
ap
tion
no.
(mon
th/
(fig
. 1)
Res
ervo
ir n
ame
day/
year
)
Sam
pl
e ty
pe
Ala
- ch
lor
ban.
)
Ala
- ch
lor
ESA
ban.)
Am
e-
tryn
Atra
- zi
neba
n.)D
EAba
n-)
DIA
ban-
)
Cya
n-
azin
eba
n-)
Cya
n-
azin
e am
ide
ban.)
De-
et
hyl-
cy
an-
azin
eba
n.)
De-
et
hyl-
cy
an-
azln
e am
ide
ban.)
Met
ol-
achl
orba
n.)
Met
rl-
buzi
nba
n.)
Prom
e-
ton
ban.
)
Prop
a-
zine
ban.)
Sim
a-
zine
ban.)
M
Mis
sour
i C
onti
nued
8 9 Q.
X §. o" Q. 8 X 3- o_ £ 2. tr
o 1 » Q.
Z 5- s 3 O c | 3 3
47
Stoc
kton
Lak
e 05
/06/
92
07/0
8/92
08/2
5/92
10/1
4/92
01/1
2/93
03/1
0/93
06/1
6/93
09/1
7/93
48
Bra
nche
d O
ak L
ake
05/0
7/92
05/0
7/92
07/0
1/92
07/0
1/92
09/1
1/92
___
09/1
1/92
10/2
7/92
01/0
6/93
03/2
3/93
07/1
3/93
09/1
4/93
S S S S S S S S S BD
S LD S LD S S S S S
<0.0
5<.
05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05 .1
2
.12
<.05
<.05
<.05
<.05
<.05 .2
6
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<0.1
0<.
10
<.10
<.10
<.10
<.10
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<.10 .7
2
1.4
1.2 .9
2
1.5
_. 1.8
1.5
1.2
1.4
3.2
<0.0
5<.
05
<.05
<.05
<.05
<.05
<.05
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05
<.05
<.05
<.05
<.05
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<.05
2.5
2.7
3.0
3.2
2.7
_ _
._.._._
2.9
2.6
2.4
1.8
2.6
2.3
<0.0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
Neb
rask
a
.72
.67
.69
.73
.54
.87
.66
.57
.55
.60
.66
<0.0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05 .5
4
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.26
.31
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.30
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.18
.19
.25
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<0.0
5<.
05
<.05
<.05
<.05
<.05
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1
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6
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<0.0
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<.05
<.05
<.05
<.05
<.05
<.05 .1
4
.18
.19
.21
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._ .14
.12
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- .23
<0.0
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05
<.05
<.05
<.05
<.05
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0
<.05 .0
9
.12
.15
<.05 .1
0<.
05-- <.
05
<0.5
0<.
50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
- <.50
<0.0
5<.
05
<.05
<.05
<.05
<.05
<.05
<.05 .0
8
.09
.09
.09
<.05 .0
5
.05
<.05
<.05 .0
8
.06
<0.0
5<.
05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<0.0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<0.0
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05
<.05
<.05
<.05
<.05
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<.05
<.05
<.05
<.05
<.05
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<.05
<.05
<.05
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<0.0
5<.
05
<.05
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<.05
<.05
49
Cal
amus
Res
ervo
ir05
/08/
92
S
07/0
9/92
S
07/0
9/92
B
D
OS/
27/9
2 S
10/2
2/92
S
<.05
<.05
<.05
<.05
<.05
<.05
<.
05
<.05
<.
05
<.05
<.
05
<.05
<.
05
<.05
<.
05
<.05
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05
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<.
05
<.05
<.
05
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<.
05
<.05
<.
05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.50
<.50
<.50
<.50
<.50
<.05
<.05
<.05
<-05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05 .0
8
.08
<.05
<.05
Tabl
e 5.
A
naly
tical
res
ults
for s
elec
ted
herb
icid
es a
nd s
ix m
etab
olite
s in
sam
ples
col
lect
ed fr
om 7
6 re
serv
oirs
in th
e M
idw
este
rn U
nite
d S
tate
s, A
pril
1992
thro
ugh
Sep
tem
ber
1993
Con
tinue
d
Dat
e of
co
llec-
M
ap
tion
Sam
- no
, (m
onth
/ pi
e (f
ig. 1
) R
eser
voir
nam
e da
y/ye
ar)
type
Ala
- ch
lor
(ug/
L)
Ala
- ch
lor
ESA
Am
e-
tryn
(ug/D
Atra
- zl
neD
EADI
AC
yan-
az
ine
Cya
n-
azin
e am
ide
De-
et
hyl-
cy
an-
azin
e
De-
et
hyl-
cy
an-
azin
e am
ide
Met
ol-
achl
orM
etri-
bu
zin
Prom
e-
ton
Prop
a-
zine
(ug/L
)
Sim
a-
zine
Neb
rask
a C
ontin
ued
>
49
Cal
amus
Res
ervo
ir
12/1
6/92
S
j
Con
tinue
d 12
/16/
92
BD
o 03
/24/
93
S
3
08/0
4/93
S
8 09
/17/
93
S
3*
50
Cun
ning
ham
Lak
e 05
/06/
92
S
W
06/3
0/92
S
g
08/2
7/92
S
£
10/2
6/92
S
$
01/0
4/93
S
a- 0 E
01/0
4/93
B
D
*
03/2
4/93
S
0.
07/1
2/93
S
2
09/1
3/93
S
2.
S
51
End
ers
Res
ervo
ir
05/0
7/92
S
2.
05/0
7/92
L
D
|
07/0
7/92
S
>
08/2
5/92
S
=
10/2
0/92
S
^
10/2
0/92
L
D
g 12
/15/
92
S
£
03/2
3/93
S
JJ
08/0
3/93
S
8
09/2
1/93
S
5T » 09
/21/
93
LD
<0.0
5
<.05
<.
05
<.05
<.05
<.05
<.05
<.
05
<.05
<.05
<.05
.07
<.05
<.05
<.05
<.05
<.05
<.05
.. <.05
<.
05
<.05
<.05
<.05
<0.1
0
<.10 .1
6
.42
.36
.54
.44
.33
.39
.31
.45
<.10
<.10
<.10
<.10
<.10
<.10 <!o ::: <.10
<0.0
5 <.
05
<.05
<.05
<.05
<.05
<.05
<.
05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.
05
<.05
<.05
<.05
<0.0
5 <.
05
<.05
<.05
<.05 .8
8
.73
.72
.49
.40
.35
1.2 .9
3
<.05
<.05 .0
9<.
05 .10
_ .33
.06
.08
.11
.11
<0.0
5 <.
05
<.05
<.05
<.05 .2
4
.19
.22
.18
.15
.10
.20
.22
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<0.0
5
<.05
<.
05
<.05
<.05 .2
5
.22
.17
.13
.09
.08
.26
.32
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.
05
<.05
<0.0
5 <.
05
<.05
<.05
<.05
1.3
1.6
1.1 .5
6
.50
.43
2.8
1.5
<.05
<.05
<.05
<.05
<.05
.. <.05
<.
05
<.05
<.05
<.05
<0.0
5
<.05
<.05
<.05
1.3 .9
7 1.
2 .60
.91
.80
.67
<.05
<.05
<.05
<.05
<.05
._ <.05
<.
05
<.05
<.05
<0.0
5
<.05
<.
05-. <.
05 .32
.28
.30
.18
.20
<.05 .2
1
<.05
<.05
<.05
<.05
<.05
.. <.05
<.05
<.05
<.05
<0.5
0
<.50
<.
50 <.
50
<.50 .8
6 <.
50 .31
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
._ <.50
<.
50
<.50
<.50
<0.0
5
<.05
<.
05
<.05
<.05
<.05
<.05
<.
05<.
05
<.05
<.05
.05
<.05
<.05
<.05
<.05
<.05
<.05
.. <.05
<.
05
<.05
<.05
<.05
<0.0
5
<.05
<.
05
<.05
<.05
<.05
<.05
<.
05<.
05
<.05
<.05
<.
05
<.05
<.05
<.05
<.05
<.05
<.05
.. <.05
<.
05
<.05
<.
05
<.05
<0.0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.
05<.
05
<.05
<.05
<.
05
<.05
<.05
<.05
<.05
<.05
<.05
.. <.05
<.
05
<.05
<.05
<.05
<0.0
5
<.05
<.
05
<.05
<.05
<.05
<.05
<.
05
<.05
<.05
<.05
<.
05
<.05
<.05
<.05
<.05
<.05
<.05
.. <.05
<.
05
<.05
<.05
<.05
<0.0
5
<.05
<.
05
1.2
<.05
<.05
<.05
<.
05
<.05
<.05
<.05
<.
05
<.05
<.05
<.05
<.05
<.05
<.05
.. <.05
<.
05
<.05
<.
05
<.05
Tabl
e 5.
A
naly
tical
res
ults
for
sele
cted
her
bici
des
and
six
met
abol
ites
in s
ampl
es c
olle
cted
from
76
rese
rvoi
rs in
the
Mid
wes
tern
Uni
ted
Sta
tes,
Apr
il 19
92 th
roug
h S
epte
mbe
r 19
93 C
ontin
ued
ncentrations
o iril
1992
Throw 31
ww
« 4 if
1 a
2" i il 8i JO X (0 a o'
a (0 § a
o. (0 JO 0) 3 Q.
Z
C 5' 3 (0 5' O c 1 3 3 « a Q. S a * (0
0 3 3D (0 i
Dat
e of
co
dec-
M
ap
tlon
no.
(mon
th/
(fig
. 1)
Res
ervo
ir n
ame
day/
year
)
Sam
pl
e ty
pe
Ala
- ch
lor
(ug/
L)
Ala
- ch
lor
ESA
(ug/
L)
Am
e-
tryn
(ug/L
)
Atra
- zi
ne
(ug/
L)D
EA(ug
/L)
DIA
(ug/
L)
Cya
n-
azin
e (u
g/L)
Cyan
- az
lne
amid
e (u
g/L)
De-
et
hyl-
cy
an-
azln
e (u
g/L)
De-
et
hyl-
cy
an-
azin
e am
ide
(ug/
L)
Met
ol-
achl
or
(ug/
L)
Met
ri-
buzi
n (u
g/L)
Prom
e-
ton
(ug/
L)
Prop
a-
zine
(u
g/L)
Sim
a-
zine
(u
g/L)
Neb
rask
a C
onti
nued
52
Har
lan
Cou
nty
Lake
05
/05/
9207
/08/
92
08/2
6/92
10/2
1/92
12/1
4/92
03/2
2/93
03/2
2/93
07/2
2/93
09/2
0/93
53
Har
ry S
trunk
Lak
e 05
/06/
92
07/0
8/92
08/2
6/92
10/2
1/92
10/2
1/92
12/1
4/92
12/1
4/92
03/2
2/93
08/0
3/93
09/2
0/93
54
Hug
h B
utle
r La
ke
05/0
6/92
07/0
7/92
08/2
6/92
10/1
9/92
12/1
5/92
03/2
3/93
08/0
3/93
09/2
1/93
S S S S S S BD
S S S S S S LD S LD S S S S S S S S S S S
<0.0
5
<c.05
<c.05
<.05
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<c.05
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<.05
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<J)5
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<.05 .0
9
<.05
<.05
<.05
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<.05
<.05
<.05
<0.1
0
.34
.25
.23
.17
.22
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.19
.51
<.10
<.10
<.10
<.10
----
-
<.10
<.10
<.10 .3
7
.58
<.10
<.10
<.10
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<.10
<.10
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<.10
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<.05
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J)5
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<c.05
<.05
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0.54
1.3
1.3
1.4
1.2
1.4
1.3 .9
6
1.2 .1
5
.21
.30
.32
__
_ 34
^
.27
.29
.47
1.4
1.2 .0
6
.28
.41
.13
.40
.41
.70
.53
0.19 .4
0
.30
.37
.33
.39
.35
.27
.35
<c.05 .0
7
.07
.08 m .07
.08
.08
.32
.32
<.05 .0
9
.08
<.05 .0
8
.06
.16
.11
0.07 .1
4
.08
.14
.09
.15
.18
.09
.15
<c.05
<.05
<.05
<.05
<05
<.05
<.05
<.05 .1
8
.21
<.05 .0
5
<.05
<.05
<c.05
<.05 .0
8
.07
0.07 .1
3
.12
.10
<.05 .0
9
.08
<.05 .1
7
<c.05
<.05
<.05
<.05
<J)5
<.05
<.05
<.05 .1
8
.25
<.05 .0
9
<.05
<.05
<.05
<.05
<.05
<.05
<0.0
5
.08
.14
.10
.11
.08
.06
.08
<c.05
<c.05
<.05
<.05
<J)5
<.05
<.05
<.05
_ .13
<.05
<.05
<.05
<.05
<.05
<.05
<.05
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5
.08
<.05 .0
7<.
05
<.05
<.05
<.05
<.05
<c.05
<.05
<.05
<^)5
<.05
<c.05
<.05
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<.05
<.05
<.05
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<0.5
0
<.50
<c.50
<.50
<.50
<.50
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<.50
<.50
<.50
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<.50
<.50
<.50
_ <.50
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<c.50
<.50
<.50
- <.50
<0.0
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.09
.07
.07
.05
<.05
<.05 .1
1
.21
<.05
<.05
<.05
<.05
<D5
<.05
<.05
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1
.18
<c.05
<.05
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7<.
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<0.0
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<.05
<.05
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<.05
<.05
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<.05
<.05
<.05 .0
5
<.05
<.05
<.05
<.05
<.05
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<.05
<.05
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<.05
<.05
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6<.
05
<.05
<.05
<.05
Tabl
e 5.
A
naly
tical
res
ults
for
sele
cted
her
bici
des
and
six
met
abol
ites
in s
ampl
es c
olle
cted
from
76
rese
rvoi
rs in
the
Mid
wes
tern
Uni
ted
Sta
tes,
Apr
il 19
92 th
roug
h S
epte
mbe
r 19
93 C
ontin
ued
Dat
e of
co
llec-
M
ap
tion
Sam
- no
, (m
onth
/ pi
e (f
ig. 1
) R
eser
voir
nam
e da
y/ye
ar)
type
Ala
- ch
lor
(H9/
L)
Ala
- ch
lor
ESA
(H
9/L)
Am
e-
tryn
(H
9/L)
Atra
- zi
ne
(H9/
L)D
EADI
A(ng
/L)
Cya
n-
azin
e (H
9/L)
Cya
n-
azin
e am
ide
(H9/
L)
De-
et
hyl-
cyan
- az
ine
De-
et
hyl-
cyan
- az
ine
amid
eM
etol
- ac
hlor
Met
ri-
buzi
n (H
9/L)
Prom
e-
ton
(ng/L
)
Prop
a-
zine
(H
9/L)
Sim
a-
zine
(H
9/L)
Neb
rask
a C
onti
nued
>
55
Paw
nee
Lak
e 05
/07/
92
S
j|
07/0
1/92
S
o
08/2
7/92
S
3
10/2
7/92
S
»
01/0
6/93
S
5f 0
03/2
3/93
S
W
07/1
3/93
S
8
09/1
4/93
S
n a £
56
Swan
sonL
ake
05/0
6/92
S
Z
07/0
7/92
S
a
08/2
5/92
S
%
10/2
0/92
S
a
12/1
5/92
S
CO x" S
03/2
3/93
S
CD of
03/2
3/93
L
D2.
08
/03/
93
S
S
08/0
3/93
LD
>
09/2
1/93
S
"O jo
57
Will
ow C
reek
Res
ervo
ir
05/0
7/92
S
^
06/3
0/92
S
g 08
/26/
92
S
<§
10/2
6/92
S
J
01/0
5/93
S
(D H 3 03
/24/
93
S
»
07/1
2/93
S
£
09/1
3/93
S
<0.0
5.1
9.0
5
<.05
<.05
<.05 .6
4
.06
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05 .1
8
.05
<.05
<.05
<.05 .2
0
<.05
0.67
1.1
1.4
1.6
1.4 .51
3.3
4.1
<.10
<.10
<.10
<.10
<.10
<.10
<.10 .1
3
.10
.14
.25
.48
.81
.36
.54
.62
1.5
1.8
<0.0
5<.
05<.
05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
1.5
2.1
2.0
1.8
1.5
1.7
3.3
1.8 .0
7
.23
.13
.24
.24
.16
.20
.24
.21
.29
.23
2.6
1.7
<.05 .2
0
.23
1.3 .5
9
0.44 .4
7
.48
.49
.48
.49
.60
.45
<.05 .0
7
.05
.08
.08
<.05
<.05 .0
7
.06
.07
.09
.33
.36
<.05 .0
6
.06
.37
.22
0.24 .1
9
.19
.19
.15
.15
.24
.28
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05 .1
9.2
0
<.05
<.05 .0
5
.35
.24
<0.0
5.0
6
<.05
<.05
<.05
<.05 .1
0<.
05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05 .3
0
.25
<.05
<.05
<.05 .3
8
.10
<0.0
5.0
9<.
05 .09
<.05
<.05
-- <.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
- - <.05
<.05 .2
3
.22
<.05
<.05
<.05
~ .11
<0.0
5.0
7<.
05 .06
<.05
<.05
-- <.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
- -- <.05
<.05 .0
8
.08
<.05
<.05
<.05
-- <.05
<0.5
0
<.50
<.50
<.50
<.50
<.50
-- <.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
- ~ <.50
<.50
<.50
<.50
<.50
<.50
<.50
- <.50
<0.0
5
.08
.06
<.05
<.05
<.05 .2
6
.10
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05 .8
5.3
1
<.05
<.05
<.05 .6
0
.12
<0.0
5<.
05
<.05
<.05
<.05
<.05
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<.05
<.05
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<.05
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<.05
<.05
<.05
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<.05
<.05
<.05
0.08 .0
7
.07
<.05 .0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<0.0
5<.
05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<0.0
5<.
05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05 .0
7
Tabl
e 5.
A
naly
tical
res
ults
for
sele
cted
her
bici
des
and
six
met
abol
ites
in s
ampl
es c
olle
cted
from
76
rese
rvoi
rs in
the
Mid
wes
tern
Uni
ted
Sta
tes,
Apr
il 19
92 th
roug
h S
epte
mbe
r 19
93 C
ontin
ued
ncentrations
oD
ate
of
coll
ec-
Map
tl
on
no.
(mon
th/
(fig
. 1)
Res
ervo
ir n
ame
day/
year
)
Sam
pl
e ty
pe
Ala
- ch
lor
Ala
- ch
lor
ESA
(ng/D
Am
e-
tryn
(H
9/L)
Atr
a-
zine
(ng/L
)D
EAD
IA
(M9/
L)
Cya
n-
azin
e (H
9/L)
Cya
n-
azin
e am
ide
(M9/L
)
De-
et
hyl-
cy
an-
azin
e (M
9/L)
De-
et
hyl-
cy
an-
azin
e am
ide
(M9/
L)
Met
ol-
achl
or
(H9/
L)
Met
ri-
buzi
n (M
9/L)
Prom
e-
ton
(M9/
L)
Pro
pa-
zine
(M
9/L)
Sim
a-
zine
(ng/L
)OT
N
orth
Dak
ota
1 S X (D
& O a __ z 1 o a (D £ ST O1 0 I 0) 3 a z ^ S sr 3 O 1 -» 5 3 £ 1 5 a S S 5 JD 0 3
58
Pipe
stem
Res
ervo
ir
05/0
7/92
05/0
7/92
06/2
5/92
06/2
5/92
08/2
5/92
10/2
6/92
01/2
1/93
05/0
4/93
07/1
3/93
09/0
9/93
09/0
9/93
59
Alu
m C
reek
Lak
e 05
/05/
92
__
07
/20/
92
07/2
0/92
09/0
8/92
11/0
4/92
01/2
0/93
03/2
5/93
03/2
5/93
07/0
1/93
09/2
7/93
60
Dee
r C
reek
Lak
e 05
/04/
92
07/3
0/92
09/0
9/92
09/0
9/92
10/1
4/92
S BD
S LD
S S S S S S LD
S S LD S S S S LD
S S S S S LD
S
<0.0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05 .6
6
.07
.09
.05
<.05
<.05
<.05 .0
6
.07
.34
.18
<.05
<.05
<.05
<0.1
0
<.10
<.1
0
<.10
<.1
0
<.10
<.10
<.1
0
<.10
<.1
0
<.1
0
2.4
±4 1.8
3.3
2.7
3.7
2.5
2.4
1.4
3.4
2.9
7.4
2.4
1.9
2.0
<0.0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
c.65
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<0.0
5
<.05
<.05
<.05 .1
0
<.05
<.05
<.05
<.05
<.05
<.05 .9
8
t:t
1.0
1.9
1.7
1.0 .89
.91
.70
1.2
2.4
2.7
1.6
1.8
1.6
<0.0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05 Ohi
o
.35
.35
.36
.65
.68
.39
.40
.41
.27
.41
.29
.48
.52
.59
.63
<0.0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05 .2
0
.19
.18
.33
.36
.19
.17
.17
.12
.23
.21
.48
.30
.33
.37
<0.0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05 .3
3
.24
.25
.48
.26
.12
.14
.14
.17
.40
.54
.36
.46
.48
.38
<0.0
5
<.05
-- -- <.05
<.05
<.05
-- <.05
<.05 .1
9
.25
.14
.38
.29
.40
.16
.14
.07
.31
.23
1.5 .5
4
.45
.62
<0.0
5
<.05
- -- <.05
<.05
- <.05
-- <.05
<.05
<.05 .0
9
<.05 .0
9
.08
.08
<.05
<.05 .0
5
<.05
<.05 .1
6
.11
.20
.12
<0.
50
<.50
- - <.50
<.50
<.50
-- <.50
<.50
<.50
<.5
0
<.50
<.5
0
<.5
0
<.5
0
<.50
<.50
<.5
0
<.50
<.50
<.5
0
<.50
<.50 .3
1
<0.0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05 .2
9
.27
.27
.49
.34
.23
.21
.21
.19
.36
1.2 .9
4
.27
.32
.20
<0.0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05 .0
9
<.05
<.05
<.05
<.05
<.0.
05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.0.
05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<0.0
5<.
05<.
05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05 .0
7.0
8
.08
.14
.12
<.05 .0
7
.07
.06
.13
.41
.08
.07
.09
.07
Tab
le 5
. A
naly
tical
res
ults
for
sel
ecte
d he
rbic
ides
and
six
met
abol
ites
in s
ampl
es c
olle
cted
fro
m 7
6 re
serv
oirs
in t
he M
idw
este
rn U
nite
d S
tate
s, A
pril
1992
thro
ugh
Sep
tem
ber
1993 C
ontin
ued
Dat
e of
co
llec-
M
ap
tion
no.
(mon
th/
(fig.
1)
Res
ervo
ir na
me
day/
year
)
Sam
- pi
e ty
pe
Ala
- ch
lor
(H9/
L)
Ala
- ch
lor
ESA
(ng/D
Am
e-
tryn
(H
9/L)
Atra
- zi
ne(ng
/L)
DEA
(H9/
L)D
IA
(H9/
L)
Cya
n-
azin
e (H
9/L)
Cya
n-
azin
e am
ide
(H9/
L)
De-
et
hyl-
cy
an-
azin
e (H
9/L)
De-
et
hyl-
cy
an-
azin
e am
ide
(ng/L)
Met
ol-
achl
orM
etri-
bu
zin
Prom
e-
ton
(H9/
L)
Prop
a-
zine
(H
9/L)
Sim
a-
zine
(H
9/L)
Ohi
o C
ontin
ued
> S. I 3) | i 3" 8 S S z 1 o Q. 8 0>
0.
CO X f IT
O I > n _t 3 CO 7
CO JJ ? i
60
Dee
r Cre
ek L
ake
10
/14/
92C
ontin
ued
01/1
2/93
03/2
6/93
07/1
2/93
09/2
9/93
09/2
9/93
61
Del
awar
e L
ake
05/0
5/92
06/3
0/92
08/1
2/92
10/0
7/92
12/3
0/92
03/2
4/93
07/0
6/93
09/2
7/93
62
Dill
on L
ake
04/3
0/92
07/0
7/92
09/1
0/92
10/1
4/92
01/1
2/93
03/2
4/93
07/0
9/93
09/2
8/93
63
Hoo
ver R
eser
voir
05
/06/
92
07/2
0/92
09/0
8/92
11/0
4/92
01/2
0/93
LD S S S S LD S S S S S S S S S S S S S S S S S S S S S
<0.0
5.0
8<.
05 .30
<.05
<.05 .2
3
.96
.13
.05
<.05
<.05 .9
7<.
05 .27
.07
<.05
<.05
<.05
<.05 .1
7<.
05 .06
.08
.08
<.05
<.05
2.4
1.5 .7
3
3.6
3.9
2.5
4.7
9.1
8.1
4.7
2.0
1.1
13 12 1.5 .9
51.
1 .95
.74
.60
4.1 1.0
2.0
3.3
3.8
3.9
3.0
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05<.
05
<.05
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<.05
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<.05
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<.05
<.05
<.05
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<.05
1.5 .4
4
.30
4.1
2.5
2.7 .9
1
4.3
2.2
1.5 .2
2
.20
5.9
3.7
1.2
1.8 .6
2
.30
.19
.11
4.9 .7
5
1.2
1.4
2.4
2.1 1.1
0.62 .2
9.1
6
.99
.81
.82
.25
.98
.77
.54
.15
.11
1.8
1.3 .1
8
.35
.31
.16
.15
.07
1.7 .2
5
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.33
.71
.85
.45
0.34 .1
7
.08
.67
.53
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.11
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.37
.24
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<.05 .9
2.6
6
.09
.27
.13
.09
.08
<.05
1.2 .18
.17
.19
.32
.40
.19
0.38 .1
3
<.05
2.6
1.3
1.2 .0
8
.86
.17
.12
<.05
<.05
1.3 .8
5
.08
.40
.05
<.05
<.05
<.05
1.4 .0
8
.19
.20
.23
.26
.08
0.57
- <.05
1.8 .8
1
1.0 .0
4-- .3
6
.29
<.05
<.05
1.1 .9
1
<.05 .4
0.1
4
.12
- <.05 1.4 .11
.13
.22
.27
.18
0.11
- <.05 .2
6
.17
.18
<.05
- <.05 .0
6
<.05
<.05 .0
9.1
3
<.05 .1
0<.
05
<.05
-- <.05 .1
6
<.05
<.05
<.05
<.05 .0
7
0.25
-- <.50
<.50
<.50
<.50
<.50
-- .56
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
- <.50
<.50
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<.50
<.50
<.50
0.20 .2
5
.15
2.4 .5
8
.59
.60
2.7
1.1 .4
5
.13
.14
3.1 .6
8
.68
.41
.24
.08
.09
<.05
2.7 .1
2
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.43
.71
.39
.21
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05<.
05
<.05
<.05
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8
.22
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<.05
<.05 .0
6
.19
<.05 .0
9<.
05
<.05
<.05
<.05
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2
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05<.
05
<.05
<.05
<.05
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9
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<.05
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0.1
4
<.05
<.05
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<.05
<.05
<.05
<.05
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<.05
<.05
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05
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<.05
<.05
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<.05
<.05
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5<.
05
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<.05
<.05 .1
2
.08
.08
.05
.18
.06
.05
<.05
<.05 .2
6
.14
.36
.32
.18
.09
.05
<.05 .9
9
.15
.12
.19
.21
.18
.09
00
00
Tabl
e 5.
A
naly
tical
res
ults
for
sele
cted
her
bici
des
and
six
met
abol
ites
in s
ampl
es c
olle
cted
from
76
rese
rvoi
rs in
the
Mid
wes
tern
Uni
ted
Sta
tes,
Apr
il
Concentrations o
April 1992
Throuc 3
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Dat
e of
co
llec-
M
ap
tion
Sam
- no
, (m
onth
/ pi
e (fi
g. 1
) R
eser
voir
nam
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y/ye
ar)
type
*\*
Ala
- ch
lor
Ala
- ch
lor
ESA
Am
e-
tryn
Atra
- zi
ne
(H9/
L)DE
ADI
A(H
9/L)
Cya
n-
azln
e
De-
C
yan-
et
hyl-
azin
e cy
an-
amid
e az
ine
(H9/
L)
(H9/
L)
De-
et
hyl-
cyan
- az
ine
amid
e (H
9/L)
Met
oi-
achl
orM
etri-
bu
zin
Prom
e-
ton
(H9/
L)
Prop
a-
zine
(H
9/L)
Sim
a-
zine
(H
9/L)
Ohi
o C
ontin
ued
63
Hoo
ver R
eser
voir
03
/25/
93
SC
ontin
ued
03/2
5/93
LD
07/0
1/93
S
09/2
4/93
S
64
Milt
on R
eser
voir
05/1
1/92
S
07/0
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S
08/1
7/92
S
10/2
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S
10/2
1/92
LD
01/1
3/93
S
04/2
0/93
S
07/2
0/93
S
09/2
1/93
S
_ _
_ _
__ _
_
__ __
_
_ _
__
65
O'S
haug
hnes
sy
05/0
5/92
S
Res
ervo
ir 06
/30/
92
S08
/12/
92
S10
/07/
92
S12
/30/
92
S
03/2
2/93
S
06/2
9/93
S
06/2
9/93
LD
09/2
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<0.0
5-- .1
0.11 <.05
<.05 .0
6<.
05<.
05
<.05
<.05 .2
0<.
05-
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2.2 .0
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05<.
05
<.05 .9
61.
3<.
05
1.6
1.6
1.1 5.8 .3
5.5
71.
41.1 1.
0 .92
.63
1.2
1.7
6.1
13 5.8
2.7
2.0 1.1 8.8
10 5.8
<0.0
5<.
05<.
05<.
05
<.05
<05
<.05
<.05
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<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<-05
<.05
<.05
0.50
- .82
4.1 .2
1 .22
1.2
1.4
1.5 .4
6.1
51.
61.
9
1.1 12 1.6 .7
7.2
0
.20
6.3
7.1 1.5
0.27
~ .19
1.1 .09
.10
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.45
.28
2.5 .4
5.2
7.1
3
.11 1.4
1.6 .5
5
0.11
~ .07
.62
<.05 .0
6.1
8.1
7.1
7
.09
<.05 .1
2.2
5
.17
1.1 .29
.16
.06
<.05 .8
1.9
2.3
6
<0.0
5~ .0
7.7
3
<.05
<.05 .1
6.2
3.1
8
.05
<.05 .3
8.5
3 -
.18
1.8 .1
4.11 <.05
<.05
2.5
2.7 .2
7
-- <0.0
5 <0
.05
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05.6
0 .0
7
<.05
<.
05.0
7 <.
05.2
6 <.
05.2
2 .0
6.2
4 .0
6
_ -- .25
<.05
- -
.11
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2.9
.34
.38
<.05
.21
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05
<.05
<.
051.
6 .2
31.
4 .1
9.2
8 <.
05
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0
<.50
<.50
<.50
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<.50
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<.50
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<.50
<.50
<.50
<.50
<.50
<.50
<.50
0.13
-- .31
1.1 05
.06
.36
.31
.31
.12
.05
.50
.40
1.1
6.1 .8
8
.32
.15
.15
3.8
4.2 .4
6
<0.0
5~ <.
05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05 .0
8
.40
.07
<.05
<.05
<.05 .2
0
.24
<.05
<0.0
5~ <.
05
<.05
<-05
<.05
<.05
<.05
<.05
CO
S
<.05
<.05
<.05
<-05 .4
9
<.05 .0
9
<.05
<.05 .0
6
.07
.12
<0.0
5~ <.
05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05 .1
4
<.05
<.05
<.05
<.05 .0
6
.07
<.05
<0.0
5~ .2
0.5
3
<.05 .0
5.1
1.1
1.1
2
.05
<.05 .1
4
.15
.20
.84
.10
.05
<.05
<.05 .3
4
.40
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1!
Sout
h D
akot
aQ
. i § 3 31
<D O
66
Sand
Lak
e 05
/06/
92
S06
/24/
92
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/31/
92
S10
/14/
92
S01
/22/
93
S
<.05
<.05
<.05
<.05
<.05
.14
<.10
<.10
<.10
<.10
<.05
<.05
<.05
<.05
<.05
<.05 .0
7<.
05<.
05<.
05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05 .1
1<.
05<.
05<.
05
<.05
<.
05<.
05
<.05
<.05
<.
05<.
05
<.05
<.05
<.
05
<.50
<.50
<.50
<,50
<.50
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
Tabl
e 5.
A
naly
tical
res
ults
for
sele
cted
her
bici
des
and
six
met
abol
ites
in s
ampl
es c
olle
cted
from
76
rese
rvoi
rs in
the
Mid
wes
tern
Uni
ted
Sta
tes,
Apr
il 19
92 th
roug
h S
epte
mbe
r 19
93 C
ontin
ued
Dat
e of
co
llec
- M
ap
tlon
Sa
m-
no,
(mon
th/
pie
(fig
. 1)
R
eser
voir
nam
e da
y/ye
ar)
type
Ala
- ch
lor
(H9/
L)
Ala
- ch
lor
ESA
(ng/L)
Am
e-
tryn
Atr
a-
zine
DEA
(ng/L)
DIA
(ng/L)
Cya
n-
azin
e(ng
/L)
Cya
n-
azin
e am
ide
De-
et
hyl-
cyan
- az
ine
(ug/L)
De-
et
hyl-
cy
an-
azin
e am
ide
Met
ol-
achl
or(n
g/D
Met
ri-
buzi
nPr
ome-
to
n(ng
/L)
Prop
a-
zine
(ng/L)
Sim
a-
zine
(ng/L
)So
uth
Dak
ota C
ontin
ued
SL o" £. 3J
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(0 c S 0* » ! 1 » rbicides ai a <A X Metaboli 1 TO <O
18 ? (Q 3-
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09/0
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S
67
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ppew
a Fl
owag
e 05
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S
07/1
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D
08/1
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10/2
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01/0
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D
04/2
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07/1
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09/0
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S
68
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ryla
nd R
eser
voir
05
/06/
92
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05/0
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D
07/1
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S
08/1
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S
10/2
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S
01/0
6/93
S
04/2
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S
04/2
1/93
L
D
07/1
3/93
S
09/0
8/93
S
69
Lak
eMen
dota
05
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92
S
07/2
1/92
S
08/2
1/92
S
10/2
3/92
S
01/0
5/93
S
<0.0
5
<.05 .0
8
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<0
5
<.05
<0
5
<0.1
0
.10
<.10 .2
0
.21
.25
.10
<.10 .1
8
.26
.33 :E <.
10
<.1
0
<1
0
<.10
<.10 .7
5
1.0 .8
7
.91
.55
<0.0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
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<.05
<.05
<.05
<.05
<.05
<.05
<.05
<0.0
5
<.05 .0
8
<.05 .2
5
.30
<.05
<.05
<.05
<.05
.14
.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
.32
.28
.35
.28
.31
<0.0
5
<.05
<.05
<0.0
5
<.05
<.05
Wis
cons
in<.
05
<.05
.06
.07
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
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.23
.17
.23
.21
.20
<.05
<.05
<.05
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<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
.10
.06
.10
.09
.07
<0.0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<0
5
<.05
<0
5
<.05
.12
.10
.12
.09
.11
<0.0
5
<.05 .0
8
<.05 .1
0
.11
<.05
<.05
- -- <.05
<.05
<.05
<.05
<.05
<.05
- - -- <.05
.11
.14
.10
.10
.06
<0.0
5
<.05
<.05
<.05 .0
8
.05
<.05
<.05
-- -- <.05
<.05
<.05
<.05
<.05
<.05
-- -- -- <.05
<0
5
<.05
<.05
<.05
<.05
<0.5
0
<.50
<.50
<.50
<.5
0
<.50
<.50
<.50
- -- <.50
<.50
<.50
<.50
<.5
0
<.5
0
-- -- - <.5
0
<.5
0
<.5
0
<.50
<.5
0
<.50
<0.0
5
<.05
<.05
<.05 .0
8
.10
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
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5
<.05
<.05
<.05
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<.05
<.05
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<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
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5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<0.0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<05
<.05
<.05
<.05
<.05
<.05
<0.0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<05
<.05
<.05
00 <o
Tabl
e 5.
A
naly
tical
res
ults
for
sele
cted
her
bici
des
and
six
met
abol
ites
in s
ampl
es c
olle
cted
from
76
rese
rvoi
rs in
the
Mid
wes
tern
Uni
ted
Sta
tes,
Apr
il
Concentrations
o Apri
l 1
992
Throuj ,«£
CO
.
1 S I? £2
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%7v
j v-
/»
Dat
e of
co
llec-
M
ap
tion
no.
(mon
th/
(fig
. 1)
Res
ervo
ir n
ame
day/
year
)
69
Lak
e M
endo
ta C
ontin
ued
04/1
9/93
07/1
2/93
09/0
1/93
70
Lak
e M
enom
in
05/0
6/92
07/1
5/92
08/1
8/92
10/2
0/92
01/0
6/93
04/2
0/93
07/1
3/93
09/0
7/93
71
Lak
eMon
ona
05/0
8/92
0772
4/92
08/2
1/92
10/2
3/92
01/0
5/93
04/1
9/93
07/1
2/93
09/0
1/93
09/0
1/93
72
Lak
e W
aube
sa
05/0
8/92
07/2
1/92
08/2
1/92
10/2
3/92
01/0
5/93
jt m
i iu
<
Sam
pl
e ty
pe
S S S s s s s s s s s s s s s s s s s LD S S s s s
C7V
J
Ala
- ch
lor
<0.0
5
.07
.06
<.05 .0
5<.
05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05 .0
5
.06
.05
<.05
<.05
<.05
<.05
<.05
Ala
- ch
lor
ESA
0.99 .6
7
2.2 .2
3
.45
.34
.24
.25
.28
.43
.70
.60
.71
.65
.73
.72
.80
.89
1.2
1.2 .57
.85
.65
.67
<.10
Am
e-
tryn
(H
9/L)
<0.0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.O
S<.
05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
Atra
- zi
ne
(H9/
L)D
EA
DIA
Wis
cons
in C
ontin
ued
0.24
0.
15
0.06
.28
.25
<.05 .4
3.0
7
<.05
<.05 .0
5
.34
.06
.31
.34
.29
.27
.27
.22
.25
.22
.25
.21
.23
.25
.20
.19
.20
.21
<.05 .1
7.0
5
<.05
<.05
<.05 .0
9
.05
.17
.4*
.17
.18
.16
.13
.13
.16
.16
.16
.16
.18
.15
.11
.14
.13
<.05 .0
7
<.05
<.05
<.05
<.05
<.05
<.05
<.05 J& .0
7
.07
.06
<.05
<.05 .0
6
.10
<.05 .0
5
.06
.05
<.05
Cya
n-
azln
e
0.08 .2
1
.41
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05 .1
3
Sfr
.09
.09
.08
<.05
<.05 .2
4
.23
.10
.06
.10
.06
<.05
Cya
n-
azin
e am
ide
De-
et
hyl-
cy
an-
azin
e
De-
et
hyl-
cy
an-
azin
e M
etol
- am
lde
achl
or
Oig
/L)
Oig
/L)
<0.0
5- 0.
13
<.05 .1
0<.
05
<.05
<.05
<.05
-- <.05 .0
9.4
2^
.10
- _ -- ~ .08
.11
<.05 .1
1
.08
.12
..
- <0.0
5
<.05 .0
9
<.05
<.05
<.05
<.05
- <.05
<.05
<tt
r
.07
-- -- <.05
<.05
<.05
<.05 .0
6<.
05_
- <0.5
0
<.50
<.50
<.50
<.50
<.50
<.50
- <.50
<.50
<tt
<.50
- _ -- <.50
<.50
<.50
<.50
<.50
<.50
._
.12
.14
<.05 .1
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<tf
r<.
05
<05
<.05
<.05
<.05 .0
6
.06
<.05
<.05
<.05
<.05
<.05
Met
ri-
buzi
n
<0.0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
Prom
e-
ton
<0.0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05 .0
5<.
05
<.05
<.05
<.05
<.05
<.05
<.05 .0
7<.
05<.
05
Prop
a-
zine
<0.0
5<.
05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
Sim
a-
zine
<0.0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.t)5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
Tabl
e 5.
A
naly
tical
res
ults
for
sele
cted
her
bici
des
and
six
met
abol
ites
in s
ampl
es c
olle
cted
fro
m 7
6 re
serv
oirs
in th
e M
idw
este
rn U
nite
d S
tate
s, A
pril
1992
thro
ugh
Sep
tem
ber
1993
Con
tinue
d
Dat
e of
co
llec-
M
ap
tion
no.
(mon
th/
(fig
. 1)
Res
ervo
ir n
ame
day/
year
)
Sam
pl
e ty
pe
Ala
- ch
lor
Ala
- ch
lor
Am
e-
ESA
tr
ynA
tra-
zine
DEA
(ng/L]
Wis
cons
in
3 9L o' 9L ? § 1 3" $ I id
Herbicide
to Q.
V)
X S O1 p_ I f i 5! CO i i z
72
Lake
Wau
besa
Con
tinue
d 04
/19/
9307
/12/
93
09/0
1/93
73
Lake
Wau
sau
05/0
7/92
07/1
6/92
08/2
0/92
08/2
0/92
10/2
1/92
01/0
7/93
01/0
7/93
04/2
1/93
04/2
1/93
07/1
4/93
07/1
4/93
09/0
8/93
74
Lak
e W
isso
ta (5
548)
05
/05/
9207
/14/
92
08/1
9/92
08/1
9/92
10/2
1/92
01/0
7/93
04/2
1/93
07/1
4/93
09/0
7/93
S S S S S S LD S S LD
S BD
S LD S S S S LD S S S S S
<0.0
5.0
5<.
05
<.05
<.05
<.05
<.05
<.05
<.05
<.
05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.
05
<.05
<.05
<.05
<.05
<.05
<.05
0.87
<0
.05
.94
<.05
1.1
<.05
<.10
<.
05
.15
<.05
<.10
<.
05
<.05
<.10
<.
05
<.10
<
05
<.05
<.10
<
05
<.10
<
05
.10
<.05
<.10
<
05
<10
<.
05
<10
<.
05
<.10
<
05
<.10
<.
05<.
05
<.10
<.
05
<.10
<.
05
<.10
<.
05
<.10
<.
05
<.10
<
05
0.21 .2
1
.22
<.05 .2
0<.
05
<.05
<.05
<.05
<.05
<.05
<.05 .1
7
.16
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
0.13 .1
6
.15
<.05 .0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.
05
<.05
<.05
<.05
<.05
<.
05
<.05
DIA
> (H
9/L)
Con
tinu
ed
0.05 .0
8
.08
<.05
<.05
<.05
<.05
<.05
<.05
<.
05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.
05
<.05
<.05
<.05
<.05
<.05
<.05
Cya
n-
azin
e
<0.0
5.2
5
.19
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.
05
<.05
<.05
<.05
<.05
<.05
<.05
<.
05
<.05
<.05
<.05
<.05
<.05
<.05
Cya
n-
azin
e am
ide
-- 0.09
<.05 .1
0-- -- <.
05
<.05
<.05
-- - <.05
<.05
<.05
<.
05
<.05
<.05
<.05
<.05
<.05
De-
et
hyl-
cy
an-
azin
e
- <0.0
5
<.05
<.05
-- - <.05
<.05
<.05
- -- <.05
<.05
<.05
<.
05
<.05
<.05
<.05
<.05
<.05
De-
et
hyl-
cy
an-
azin
e am
ide
(ng/L)
- <0.5
0
<.50
<50 -- - <.50
<.50
<.50
-- -- <.50
<.50
<.50
<.
50
<.50
<50
<.50
<.50
<.50
Met
ol-
achi
or
<0.0
5<.
05
<05
<.05
<.05
<.05
<.05
<.05
<.05
<.
05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.
05
<.05
<.05
<.05
<.05
<.
05
<.05
Met
ri-
buzi
n (W
J/L)
<0.0
5<.
05<.
05
<.05
<.05
<.05
<.05
<.05
<.05
<.
05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.
05
<.05
<.05
<.05
<.05
<.
05
<.05
Prom
e-
ton
<0.0
5<.
05<.
05
<.05
<.05
<.05
<.05
<.05
<.05
<.
05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.
05
<.05
<.05
<.05
<.05
<.
05
<.05
Prop
a-
zine
<0.0
5<.
05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.
05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.
05
<.05
Sim
a-
zine
<0.0
5<.
05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.
05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.
05
<.05
<.05
<.05
<.05
<.
05
<.05
JS Ta
ble
5.
Ana
lytic
al r
esul
ts fo
r sel
ecte
d he
rbic
ides
and
six
met
abol
ites
in s
ampl
es c
olle
cted
from
76
rese
rvoi
rs in
the
Mid
wes
tern
Uni
ted
Sta
tes,
Apr
il>
0
73
O3
. 3
US
S3 ~
ro 3
? 3
(Q
O
«»
(O e
p_
5T s
f§
S.?«T
|1 JO X ID 3- o. i 0 I D> 3 a z
c 5* § 5" 0 c 1 3
1 O
O£
. U
llir
U^II U
^fJldllU
d
1 £7f7
«J
Wt
Dat
e of
colle
c-M
ap
tion
no.
(mon
th/
(fig
. 1)
Res
ervo
ir n
ame
day/
year
)
II I
UI
IUC
Sam
pl
ety
pe
;u
Ala
-ch
lor
0*9/
1-)
Ala
-ch
lor
ESA
(ng/
L)
Am
e-tr
yn(li
g/L)
Atra
-zi
ne0*
9/1-
)D
EA0*
9/L)
DIA
0*9/
1-)
Cya
n-az
lne
0*9/
1-)
Cya
n-az
ine
amid
e0*
9/1-
)
De-
ethy
l-cy
an-
azin
e((i
g/L)
De-
et
hyl-
cyan
-az
ine
amid
e0*
9/1-
)
Met
ol-
achl
orO
ig/L
)
Met
ri-bu
zin
0*9/
1-)
Prom
e-to
n0*
9/L)
Prop
a-zi
ne0*
9/L)
Sim
a-zi
ne0*
9/1-
)
Wis
cons
in C
onti
nued
75
Lak
e 77
46
05/0
7/92
07/1
6/92
08/2
0/92
10/2
2/92
01/0
8/93
04/2
0/93
07/1
3/93
09/0
7/93
76
Sprin
g V
alle
y L
ake
05/0
6/92
07/1
5/92
08/1
8/92
10/2
0/92
10/2
0/92
01/0
6/93
04/2
0/93
07/1
3/93
09/0
7/93
S S S S S S S S S S S S LD S S S S
<0.0
5.0
6<.
05
<.05
<.05
<.05 .0
8<.
05
<.05 .1
0
<.05
<.05
<.05
<.05
<.05 .0
7
<.05
0.19 .2
5
.21
.23
<.10 .3
7
.68
.70
.15
.78
.30
<.10
<.10
<.10 .2
0.9
8
.39
<0.0
5<.
05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<0.0
5.3
6
.32
.11
<.05 .1
0
.69
.30
.13
2.0 .8
3
.18
.17
.07
.18
1.8 .4
8
<0.0
5.0
7
.07
.07
<.05 .0
5
.18
.09
.13
.49
.22
.16
.16
.08
.15
.49
.27
<0.0
5.0
7
<.05
<.05
<.05
<.05 .0
5<.
05 .06
.22
.08
<.05
<.05
<.05
<.05 .1
9
.09
<0.0
5.1
2
.08
<.05
<.05
<.05 .1
1
<.05
<.05 .2
7
.10
<.05
<.05
<.05
<.05 .6
8
.08
<0.0
5.1
1
.08
<.05
-- _ <.05
<.05 .4
2
.08
<.05
<.05
- - _ .13
<0.0
5<.
05 .05
<.05
-- <.05
<.05 .1
3
<.05
<.05
<,05
-- - <.05
<0.5
0<.
50
<.50
<.50
-- _ <.50
<.50
<.50
<.50
<.50
<,50
-- -- _ <.50
<0.0
5.0
5
<.05
<05
<05
<.05 .1
0<.
05
<.05
<.05
<.05
<.05
<.Q
5
<.05
<.05
<.05
<.05
<0.0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<J05
<.05
<.05
<.05
<.05
<0.0
5<.
05<.
05
<.05
<.05
<.05
<.05
<.05
<.05
<.05 .0
6.0
7
.06
<.05
<.05 .0
5.0
5
<0.0
5
<05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<0.0
5<.
05
<.05
<.05
<.05
<.05
<.05
<.05 .1
0<.
05
<.05
<.05
<^05
<.05
<.05 .0
6<.
05
Tabl
e 6.
A
naly
tical
res
ults
for
sele
cted
her
bici
des
and
six
met
abol
ites
in s
ampl
es c
olle
cted
from
top
and
botto
m o
f 17
res
ervo
irs in
the
Mid
wes
tern
U
nite
d S
tate
s, A
pril
1992
thro
ugh
Sep
tem
ber
1993
[ESA
, eth
ane
sulfo
nic
acid
; DEA
, dee
thyl
atra
zine
; DIA
, dei
sopr
opyl
atra
zine
; fig
/L, m
icro
gram
s pe
r lite
r; ,
no
data
; <, l
ess
than
. Pr
omet
ryn
and
terb
utry
n w
ere
not d
etec
ted]
Map
no
. (f
ig. 1
) R
eser
voir
nam
e
Dat
e of
co
llec
tio
n (m
onth
/ da
y/ye
ar)
Sam
pl
e A
lach
lor
type
(u
g/L)
Ala
chlo
r ES
A
(ug/
L)A
met
ryn
(ug/
L)A
traz
ine
DEA
(ug/L
)D
IA(ug
/L)
Cya
n-
azin
e (u
g/L)
Cya
na-
zine
am
ide
(ug/
L)
Dee
thyl
- cy
ana-
zi
ne
(ug/
L)
Dee
thyl
- cy
ana-
zi
ne
amid
e (u
g/L)
Met
ol-
achl
or(u
g/L)
Met
ri-
buzl
n(u
g/L)
Prom
e-
ton
(ug/
L)
Prop
- az
ine
(ug/
L)
Sim
- az
ine
(ug/
L)
Illin
ois
1 8 31 c_ 8 5 a. § a 31 | 5 TO i
1 C
arly
le L
ake
4 L
akeD
ecat
ur
5 L
ake
Shel
by vi
lle
6 L
ake
Ver
miU
ion
8 R
end
Lak
e
15
Mis
siss
inew
a L
ake
19
Sala
mon
ie L
ake
23
Rat
hbun
Lak
e
08/2
5/92
08/2
5/92
09/0
1/92
09/0
1/92
08/2
5/92
08/2
5/92
08/2
8/92
08/2
8/92
08/2
4/92
08/2
4/92
08/1
7/92
08/1
7/92
08/1
8/92
08/1
8/92
08/1
2/92
08/1
2/92
top
<0.0
5bo
ttom
<.
05
top
<.05
botto
m
<.05
top
<.05
botto
m
<.05
top
<.05
botto
m
<.05
top
<.05
botto
m
<.05
top
.37
botto
m
.27
top
.51
botto
m
.61
top
.05
botto
m
<.05
-- -- 2.5
2.4 .9
3
2.0
1.9 .5
6-- 7.0
4.6
12 12 1.0
1.0
<0.0
5
.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
3.8
4.1 1.0 .98
1.7
1.7
1.6
1.5
1.2
1.1
4.2
3.3
5.5
5.2
2.1
2.0
0.63 .7
2
.38
.35
.45
.44
.54
.52
.24
.23
0.32 .3
3
.20
.19
.26
.24
.45
.46
.12
.12
Indi
ana
1.1
.81
.87
1.3
1.3
.78
.84
.82
Iow
a.5
0 .4
2
.53
.43
0.53 .5
6
.20
.18
.50
.52
.57
.59
.30
.38
2.1 1.0
2.1
2.2
2.0
1.9
0.28 .3
4
.35
.40
.33
.37
1.5
1.4 .27
.24
.46
1.1 .5
3.6
4
1.3
1.8
0.10 .1
5
<.05 .0
5
.15
.13
.10
.12
<.05 .0
7
.21
.20
.25
.26
.33
.28
<0.5
0<.
50
<.50
<.50
<.50
<.50
<.50
<.
50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
0.20 .2
0
.43
.40
.27
.34
.24
.24
<.05
<.05
1.9
1.5
1.7
2.0 .1
8
.16
<0.0
5<.
05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05 .1
0
<.05 .1
3.1
6
<.05
<.05
<0.0
5
<.05
<.05
<.05 .0
5
.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<0.0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05 .0
5
<.05 .0
6
.06
<.05 <.05
0.66 .7
4
<.05
<.05 .1
4
.22
<.05
<.
05 .10
.09
.24
.13
.11
.10
<.05 <.05
to co
Kan
sas
f30
Po
mon
a L
ake
08/2
7/92
08/2
7/92
top
<.05
botto
m
<.05
.46
.46
<.05
<.05
2.3
2.2
.46
.50
.21
.20
<.05
<.05
<.05
<.05
<.05
<.05
<.50
<.50
.29
.28
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.
05
2 Ta
ble
6.
Ana
lytic
al r
esul
ts fo
r se
lect
ed h
erbi
cide
s an
d si
x m
etab
olite
s in
sam
ples
col
lect
ed fr
om to
p an
d bo
ttom
of
17 r
eser
voirs
in th
e M
idw
este
rn
Concentrations
April 1992
Thro <§ 3
.</
>£f S
CT z
Jo ~
to £
2."f X o
'51 a sr o- o. f 0) Q
. z 5 5' i o §;
1 i
\J\
Ill
tst
Map
no
.
34 36 40 48 57 59--
62 69
j <
_>ic
ti^o
, n|ji
ii ic
Res
ervo
ir n
ame
Cro
ss L
ake
Lac
Qui
Par
leR
eser
voir
Win
nibi
gosh
ish
Res
ervo
ir
Bra
nche
d O
ak L
ake
Will
ow C
reek
Res
ervo
ir
Alu
m C
reek
Lak
e
Dill
on L
ake
Lake
Men
dota
I<JC
- 11
II
VJU
Dat
e of
co
llec
tio
n (m
onth
/ da
y/ye
ar)
08/1
9/92
08/1
9/92
08/2
0/92
08/2
0/92
08/1
7/92
08/1
7/92
09/1
1/92
09/1
1/92
08/2
6/92
08/2
6/92
08/0
6/92
0870
6792
09/1
5/92
09/1
5/92
07/2
3/92
07/2
3/92
iyi
i \j
\i
Sam
pl
e ty
pe
top
botto
m
top
botto
m
top
botto
m
top
botto
m
top
botto
m
top
botto
m
top
botto
m
top
botto
m
|^lt
sl
1 IU
t
Ala
chlo
r
<0.0
5<.
05
<.05
<.05
<.05
<.05
<.05 .0
5
.05
<.05 .1
1
<.05
<.05
<.05
<.05
<.05
1
1 \S
\S\J
Ala
chlo
r ES
A
<0.1
0
.14
1.1 .9
9
-- .60
.74
.77
.83
4.2
4.5 .4
9
.91
.73
.99
\S
\JI I
LII
Am
etry
n
<0.0
5<.
05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.O
T
<.05
<.05
<.05
<.05
IUC
7V
4
Atr
azin
e
0.05 .0
8
.39
.35
.06
.06
2.6
2.7
1.6
1.6
1.6
2.0 .5
0
.40
.30
.33
DEA
DI
A (H
9/L)
(n
g/L)
Min
neso
ta
<0.0
5 <0
.05
<.05
<.
05
.12
.27
.09
.09
<.05
<.
05
<.05
<.
05
Neb
rask
a
.62
.23
.69
.27
.34
.18
.33
.17
Ohi
o
.54
.75
788
49
.25
.10
.18
.09
Wis
cons
in
.21
.09
.24
.09
Cya
n-
azin
e(ng
/L)
<0.0
5<.
05 .48
.45
<.05
<.05 .2
2
.30
.14
.17
.31
.30
<.05
<.05 .1
1
.09
vyan
a-
zine
am
ide
- <0.0
5
.64
.27
.09
<.05 .1
9
.19
.24
.24
.50
.42
<.05
<.05
<.05 .1
6
Dee
thyl
- cy
ana-
zi
ne(ng
/L) --<0
.05
.13
.10
<.05
<.05 .0
8<.
05 .12
<.05 .1
5
.22
<.05
<.05
<.05 .1
0
Dee
thyl
- cy
ana-
zi
ne
amid
e
-- 0.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
<.50
Met
ol-
achl
or
<0.0
5
<.05
<.05
<.05
<.05
<.05 .0
5.0
6
.29
.28
.46
.66
.16
.11
<.05
<.05
Met
ri-
buzi
n
<0.0
5<.
05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
Prom
e-
ton
<0.0
5<.
05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
Prop
- az
ine
<0.0
5
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
Sim
- az
ine
<0.0
5<.
05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05 .1
3
.17
.15
.14
<.05
<.05
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03 (U
Deethylcyanaz
Herbicide Compounds Analyzed and Percentage Detections, April 1992 Through September 1993 95
> o
o
o
Tabl
e 8.
Phy
sica
l pro
perti
es a
nd a
naly
tical
res
ults
for
nutri
ents
col
lect
ed fr
om 7
6 re
serv
oirs
in th
e M
idw
este
rn U
nite
d S
tate
s, A
pril
1992
thro
ugh
Sep
tem
ber
1993
[(iS
/cm
, m
icro
siem
ens
per c
entim
eter
at 2
5 de
gree
s C
elsi
us; °
C, d
egre
e C
elsi
us; m
g/L
, mill
igra
ms
per l
iter;
<, le
ss th
an;
, no
dat
a]
rations
of
Selected
)2
Through
Septemi If il "f X 1 0 i | Q
.Z i 5 Sf
w 5* 0 1 3 3 i Q
. a i 5 31 i O 5
Dat
e of
co
llect
ion
Map
no.
(m
onth
/day
/ (f
ig. 1
) R
eser
voir
nam
e ye
ar)
1 C
arly
le L
ake
04/3
0/92
06/2
4/92
08/2
5/92
10/2
1/92
01/1
3/93
03/3
0/93
07/1
5/93
09/2
0/93
2 C
rab
Orc
hard
Lak
e 05
/01/
9206
/25/
9208
/27/
9210
/22/
9201
/15/
93
03/2
6/93
07/0
7/93
09/2
1/93
3 D
evils
Kitc
hen
Lak
e 05
/01/
9206
/25/
9208
/27/
9210
/22/
9201
/15/
93
Col
lec
tio
n tim
e (2
4-
hour
)
1030
1415
1000
1450
1400
1210
1230
0930
0945
3445
1140
1030
1130
1510
1000
0900
1100
1245
1410
1250
1515
Spec
ific
Wat
er
cond
uct-
te
mpe
ra-
ance
tu
re
(US/
cm)
(°C
)
420
466
491
495
396
387
417
358
268
333
418
327
308
270
269
287
107
164
211
134
131
Illin
ois
13.5
24.0
25.0
15.5 2.0
10.0
28.0
21.5
16.0
25
^23
.517
.0 4.0
7.0
28.5
20.0
18.0
22.0
22.5
17.0 4.5
PH
(sta
ndar
d un
its)
7.7
7.5
7.8
7.9
7.6
8.3
7.8
7.4
7.9
7,5
7.6
8.2
7.6
7.5
7.7
8.4
7.9
7.0
7.6
7.5
8.2
Nitr
ite
plus
ni
trat
e as
ni
trog
en
(mg/
L)
0.35 .1
1<.
05<.
052.
3
3.7 .4
7.3
8
.05
.34
.11
<.05 .1
1
.05
<.05 .2
6
.05
.07
.08
<.05 .0
6
Nitr
ite a
s ni
trog
en
(mg/
L)
0.02 .0
7.0
1<.
01 .03
.03
.01
<.01
<.01 .09
^
.01
<.01 .0
1
.01
<.01 .0
2
.01
.01
.01
<.01 .0
1
Ort
ho-
Am
mo-
ph
osph
ate
nium
as
as p
hos-
ni
trog
en
phor
us
(mg/
L)
(mg/
L)
0.17 .1
7.1
4.0
2.1
1
.03
.12
.04
.03
.36
.02
.01
.07
<.01 .0
6.2
0
.02
.79
.04
.03
.09
0.07 .1
5.1
7.0
9.1
1
.06
.19
.18
.01
.64
.01
<.01
<.01 .0
1<.
01 .01
.01
.01
.01
.01
<.01
Silic
a as
Si
02(m
g/L)
2.3
3.4
2.5 .8 5.2
5.7
4.6
3.4 .5 2.1
4.6 .6 2.9 .1 1.7
7.9
4.1
7.8
2.0
3.6
4.4
Tabl
e 8.
Phy
sica
l pro
perti
es a
nd a
naly
tical
res
ults
for
nutri
ents
col
lect
ed fr
om 7
6 re
serv
oirs
in th
e M
idw
este
rn U
nite
d S
tate
s, A
pril
1992
thro
ugh
Sep
tem
ber
1993
Con
tinue
d
Dat
e of
co
llect
ion
Map
no.
(m
onth
/day
/ (f
ig. 1
) R
eser
voir
nam
e ye
ar)
Col
lec
tio
n tim
e (2
4-
hour
)
Spec
ific
W
ater
co
nduc
t-
tem
pera
- an
ce
ture
(^
S/cm
) (°
C)
pH
(sta
ndar
d un
its)
Nitr
ite
plus
ni
trat
e as
ni
trog
en
(mg/
L)
Nitr
ite a
s ni
trog
en
(mg/
L)
Ort
ho-
Am
mo-
ph
osph
ate
nium
as
as p
hos-
ni
trog
en
phor
us
(mg/
L)
(mg/
L)
Silic
a as
Si
O2
(mg/
L)Il
lino
is C
ontin
ued
-o f 8 o
3 §. g 1 3 9L cT
SL 8 sr ^ i 1 Sf f 10 3 (Q 3- s?
3 D
evils
Kitc
hen
Lak
e
03/2
6/93
Con
tinue
d 07
/07/
9309
/21/
93
4 L
ake
Dec
atur
04
/30/
9207
/07/
9209
/01/
9210
/20/
9201
/14/
93
03/2
4/93
07/0
7/93
09/0
9/93
5 L
ake
Shel
byvi
lle
04/3
0/92
07/0
7/92
08/2
5/92
10/2
0/92
01/1
4/93
03/2
6/93
07/1
2/93
09/0
8/93
1300
1420
1130
0900
1200
1015
1000
1045
1045
1215
1700
1040
1255
1500
1115
1315
1445
1100
0915
112
100 90 790
543
589
482
490
565
348
512
475
497
479
430
492
531
449
395
5.5
30.0
23.0
14.5
24.0
22.5
12.5 .5 5.0
25.5
24.0
14.0
20.5
24.0
14.0 2.0
7.0
23.0
22.0
6.9
6.8
8.0
7.5
8.0
7.8
8.1
8.0
8.1
7.8
8.1
8.0
7.8
7.3
7.7
7.8
8.5
7.8
7.9
0.11 .0
7<.
05
6.2
5.1
2.9 .4
26.
9
8.5
5.5
3.3
1.2
1.6
2.9
2.1
6.2
8.2
4.9
2.5
0.01
<.01
<.01 .0
8.0
7.0
5.0
2.0
3
.02
.05
.03
.02
.03
.21
.07
.05
.03
.12
.07
0.01 .0
5.0
2
.09
.03
.02
.06
.05
.01
.05
.04
.02
.24
.15
.02
.10
.02
.14
.16
0.01
<.01
<.01 .0
2.0
2.0
3.0
6.1
3
.04
.14
.11
<.01
<.01
<.01
<.01 .1
4
.04
<.01
<.01
4.4
3.1
1.7
241.
611
.4 8.3
7.5
9.5
11
.2 1.0
2.3 .2 8.7
6.2
1.4
1.2
Tabl
e 8.
P
hysi
cal p
rope
rties
and
ana
lytic
al r
esul
ts fo
r nu
trien
ts c
olle
cted
from
76
rese
rvoi
rs in
the
Mid
wes
tern
Uni
ted
Sta
tes,
Apr
il 19
92 th
roug
h S
epte
mbe
r 19
93 C
ontin
ued
2.
3-8 <O
3
to *
*Si ? §
M
ap n
o.
(o 3
, (f
ig-
1)
Res
ervo
ir n
ame
«|
"So
6 L
ake
Ver
mill
ion
||l|
(S
H
W
Q. « (0 3- o ff 1 cr o sr
8 7
Litt
le G
rass
y L
ake
0) Q. z Sr
5' I 5" O S i 3 3 S 8 8
Ren
d L
ake
1 S I 5
Dat
e of
co
llect
ion
(mon
th/d
ay/
year
)
Col
lec
tio
n tim
e (2
4-
hour
)
Spec
ific
W
ater
co
nduc
t-
tem
pera
- PH
an
ce
ture
(s
tand
ard
(|iS/
cm)
(°C
) un
its)
Nitr
ite
plus
ni
trat
e as
ni
trog
en
(mg/
L)
Nitr
ite a
s ni
trog
en
(mg/
L)
Am
mo
ni
um a
s ni
trog
en
(mg/
L)
Ort
ho-
phos
phat
e as
pho
s
phor
us
(mg/
L)
Silic
a as
Si
O2
(mg/
L)Il
linoi
s C
ontin
ued
04/3
0/92
07/0
7/92
08/2
8/92
10/2
1/92
01/1
3/93
03/1
7/93
07/0
6/93
09/0
2/93
05/0
1/92
06/2
5/92
08/2
7/92
10/2
2/92
01/1
5/93
03/2
6/93
07/0
7/93
09/2
1/93
04/3
0/92
06/2
4/92
08/2
4/92
10/2
1/92
01/1
1/93
1515
1200
1345
0830
1050
0930
1200
1045
1145
1345
1535
1400
1330
1130
1150
1230
0800
1000
1230
1120
1440
617
578
538
562
428
499
319
407 91 93 106
116
130
106 83 95 389
365
470
590
469
14.5
24.0
23.5
13.5 1.5
2.5
25.5
27.0
18.0
26.5
24.0
21.0 5.5
7.0
29.5
23.0
14.5
22.0
24.5
13.0 3.0
8.2
8.1
8.1
7.7
8.0
7.9
7.8
8.0
8.1
7.4
7.8
7.4
7.0
6.9
7.8
7.3
7.3
7.1
6.9
7.3
7.5
14.0 9.3
4.9
1.1
5.0
7.0
4.7
1.2 .0
5.0
5.0
5<.
05 .11
.12
.05
<.05 .0
5.4
1.6
2.5
3.0
9
0.07 .0
5.0
6.0
3.0
2
.01
.07
.03
.01
.01
.01
<.01 .0
1
.01
.01
<.01
<.01 .0
2.0
6.0
2<.
01
0.01 .0
1.0
2.0
4.0
7
.06
.08
.06
.19
.02
.02
.05
.05
.02
.02
.02
.03
.14
.33
.04
.02
0.02
<.01
<.01
<.01 .1
0
.07
.13
.02
.01
.01
.01
.01
<.01 .0
1.0
1<.
01 .01
.12
.18
.12
.01
5.7
6.3
8.5
4.1
7.1
7.3
9.0
1.0 .3 .9 1.9
<.l .1 1.0
3.7 .6 3.0
4.2
1.9 .8
Tabl
e 8.
P
hysi
cal p
rope
rties
and
ana
lytic
al r
esul
ts fo
r nu
trien
ts c
olle
cted
from
76
rese
rvoi
rs in
the
Mid
wes
tern
Uni
ted
Sta
tes,
Apr
il 19
92 th
roug
h S
epte
mbe
r 19
93 C
ontin
ued
Dat
e of
co
llect
ion
Map
no.
(m
onth
/day
/ (fi
g. 1
) R
eser
voir
nam
e ye
ar)
Col
lec
tio
n tim
e (2
4-
hour
)
Spec
ific
cond
uct
an
ce
(liS/
cm)
Wat
er
tem
pera
tu
rePH
(s
tand
ard
units
)
Nitr
ite
plus
ni
trate
as
nitro
gen
(mg/
L)
Nitr
ite a
s ni
trog
en
(mg/
L)
Am
mo
ni
um a
s ni
trog
en
(mg/
L)
Orth
o-
phos
phat
e as
pho
s
phor
us
(mg/
L)
Silic
a as
Si
O2
(mg/
L)Il
linoi
s C
ontin
ued
o 3- i o
B I 8 0) K I 8 I c 5? 0 S* 1 TO 3[ H (O 3
1 ,
8 R
end
Lake C
ontin
ued
03/2
4/93
07/0
7/93
09/2
0/93
9 B
rook
ville
Lak
e 05
/07/
9207
/13/
9208
/19/
9210
/23/
9201
/06/
93
03/2
4/93
07/0
8/93
09/0
7/93
10
Cat
arac
t Lak
e 05
/04/
9207
/11/
9208
/24/
9210
/21/
9201
/14/
93
03/2
2/93
07/0
7/93
09/0
2/93
1230
1645
1330
0830
0730
1330
1300
1315
1215
1515
1015
1730
2015
1540
1300
1115
1200
1330
0900
381
363
386
516
530
528
519
488
511
499
540
390
406
313
365
388
386
381
382
5.0
28.0
21.0
Indi
ana
13.5
13.5
14.0
13.0 5.5
7.0
12.5
16.0
15.0
21.5
25.0
16.0 3.0
3.0
22.5
24.0
7.0
7.1
7.0
8.4
8.0
7.6
7.6
8.3
7.4
7.5
7.5
7.9
7.6
7.8
8.0
8.1
8.2
7.4
7.6
0.05 .1
0.3
9
1.1 .8
8.1
4.2
21.
5
1.2
2.0
1.4
3.3
1.4
1.4 .6
12.
7
3.5
2.6 .4
2
0.01
<.01 .0
3
<.01 .0
2.0
1.0
1.0
2
.01
.05
.12
.05
.08
.05
.05
.03
.01
.11
.05
0.01 .0
6.1
7
.01
.06
.08
1.3 .0
4
.04
.14
.29
.09
.40
.13
.15
.13
.11
.42
.16
0.01 .0
4.0
6
<.01
<.01 .0
1.0
7<.
01
<.01
<.01
<.01 .0
4<.
01<.
01<.
01 .05
.03
<.01 .0
7
0.2
2.8
3.5 .8 2.9
7.0
2.9
1.9
4.2
2.7
2.9
4.8
3.8
4.8
4.6
2.7
7.1
6.1
3.8
o la
uie
o.
rnys
iuai
pro
pert
ies
ant
>0
Sep
tem
ber
199
3 C
ontin
ued
n
o it 10 3
H =f §
Map
no.
(§ o
(fi
g- 1
) R
eser
voir
nam
e
i ana
iyii
uai
res
Dat
e of
colle
ctio
n(m
onth
/day
/ye
ar)
uus
iur
MU
Col
lec
tion
time
(24-
hour
)
men
is u
unt
Spec
ific
cond
uct
ance
(|iS/
cm)
;uie
u nu
m ,
Wat
erte
mpe
ra
ture
(°C
)
ro r
eser
voir
:
PH(s
tand
ard
units
)
5 in
me
ivnu
Nitr
itepl
usni
trat
e as
nitr
ogen
(mg/
L)
iwes
iern
ui m
eu o
iaie
s,M
prn
i»»<
£
Ort
ho-
inro
ugn
Am
mo-
ph
osph
ate
Nitr
ite a
sni
trog
en(m
g/L)
nium
as
nitr
ogen
(mg/
L)
as p
hos
phor
us(m
g/L)
Silic
a as
Si0
2(m
g/L)
(/> J
B In
dian
a C
ontin
ued
"5 o
11
Ea
gle
Cre
ek R
eser
voir
| |
2. |
to S
. u
5! _ <D 31 o_' s i O1 p_ |f
12
Hun
tingt
on L
ake
0> 3 Q.
Z c 5' 3
5f 3" O | i 3 3 I 8
13
Lake
Sha
fer
I s 5.' I i 3) <D
0>
05/0
4/92
07/0
6/92
08/2
7/92
10/2
7/92
01/0
7/93
03/2
9/93
07/0
8/93
09/0
3/93
05/0
5/92
07/1
4/92
08/2
6/92
10/2
7/92
01/1
1/93
03/2
3/93
07/0
9/93
09/1
6/93
05/0
5/92
07/1
4/92
08/2
6/92
10/2
6/92
01/1
2/93
0915
1300
1120
1445
1300
1045
0930
0900
1730
1300
1730
0915
1230
1545
1715
1130
1030
1315
1000
1230
1130
528
462
465
439
464
459
455
397
572
435
552
610
458
545
310
520
628
574
578
564
560
14.5
24.5
22.0
14.5 5.0
7.0
22.0
25.5
14.5
23.5
22.5
11.5 2.0
4.5
24.0
20.5
15.5
24.5
24.0
12.0 .5
8.6
7.2
7.5
8.0
8.0
8.1
7.8
7.6
8.1
7.5
7.6
7.9
7.5
8.3
7.4
7.5
8.0
7.8
7.8
8.0
7.4
6.5
3.8
1.6
1.8
2.5
3.7
2.1
<.05
9.1 8.0 .4
12.
94.
3
3.7
6.6 .4
3
3.5
3.6 .3
52.
44.
0
0.07 .1
4.1
5.0
7.0
3
.03
.12
.01
.13
.28
.06
_ _
_
_
.05
.06
.03
.32
.03
.03
.06
.02
.02
.03
0.06 .1
71.
1 .04
.10
.02
.03
.26
.11 .18
.80
_
_ _.
..._
.19
.22
.20
.16
.26
.02
.15
.10
.02
.07
0.01
<.01 .0
2<.
01 .08
<.01
<.01
<.01 .1
4.0
9.1
2
.06
.28
.06
.18
.04
<.01 .0
5<.
01 .02
.04
3.7 .7
4.3
2.9
5.8
4.2
2.2
3.4
8.0
_ 5.3
7.5
6.9
5.1
5.6 .8 4.3
11 7.5
9.9
8.1
Tabl
e 8.
P
hysi
cal p
rope
rties
and
ana
lytic
al r
esul
ts fo
r nu
trien
ts c
olle
cted
from
76
rese
rvoi
rs in
the
Mid
wes
tern
Uni
ted
Sta
tes,
Apr
il 19
92 th
roug
h S
epte
mbe
r 19
93-^
Con
tinue
d
Dat
e of
co
llect
ion
Map
no.
(m
onth
/day
/ (fi
g. 1
) R
eser
voir
nam
e ye
ar)
Col
lec
tio
n tim
e (2
4-
hour
)
Spec
ific
cond
uct
an
ce
Wat
er
tem
pera
tu
repH
(s
tand
ard
units
)
Nitr
ite
plus
ni
trat
e as
ni
trog
en
(mg/
L)
Nitr
ite a
s ni
trog
en
(mg/
L)
Orth
o-
Am
mo-
ph
osph
ate
nium
as
as p
hos-
ni
trog
en
phor
us
(mg/
L)
(mg/
L)
Silic
a as
Si
O2
(mg/
L)In
dian
a C
ontin
ued
o w 8 o 5 "8 n a. 0 w CD Q.
1 I g SL 3D i s? s- z 5* 1 o (O I <| w 9 a » 3
13
Lak
e S
haf
er C
ontin
ued
03/2
3/93
07/1
2/93
09/0
3/93
14
Man
sfie
ld L
ake
05/0
4/92
07/1
1/92
08/2
4/92
10/2
1/92
01/1
2/93
03/2
2/93
07/1
0/93
09/1
5/93
15
Mis
siss
inew
a L
ake
05/0
4/92
07/1
4/92
08/2
6/92
10/2
6/92
01/1
1/93
03/2
3/93
07/0
9/93
09/1
5/93
0930
1300
1515
1730
1700
1150
1000
1530
1445
1500
1200
1730
1700
1400
1615
1730
1215
1430
1700
539
575
573
529
545
467
421
448
444
451
373
444
422
335
505
430
396
443
417
4.5
27.0
23.0
12.5
14.5
21.0
15.0 4.0
3.0
19.0
22.0
13.5
21.5
23.5
11.5 2.0
2.5
22.0
22.0
8.1
8.2
7.8
8.2
7.8
7.4
8.0
7.7
8.5
7.7
7.3
7.9
7.5
7.9
7.9
7.4
8.1
7.4
7.5
4.1
2.2
1.1
4.6
3.6
2.6
2.2
2.6
4.3
1.9 .4
7
5.6
5.5
1.4
2.5
2.1
3.3
4.4
1.2
0.02 .0
3.0
3
.05
.10
.04
.19
.04
.02
.03
.04
.08
.12
.04
.05
.04
.02
.08
.16
0.07 .0
5.1
9
.17
.61
.49
.09
.19
.20
.42
.79
.18
.06
.08
.27
.15
.15
.04
.07
0.02 .0
1.0
6
<01
<.01
<.01
<.01 .0
4
.04
<.01 .0
1
.10
.07
<.01 .0
6.1
0
.10
.05
.02
6.1
9.0
7.1
2.5
3.8
6.2
3.6
6.9
6.2
3.6
3.2
5.2
3.8
3.6
7.8
7.9
6.1
5.3
2.8
Tabl
e 8.
P
hysi
cal p
rope
rties
and
ana
lytic
al r
esul
ts fo
r nu
trien
ts c
olle
cted
from
76
rese
rvoi
rs in
the
Mid
wes
tern
Uni
ted
Sta
tes,
Apr
il 19
92 th
roug
h S
epte
mbe
r 19
93 C
ontin
ued
Ss ni g §
Map
no.
,§
o (f
ig-1
) R
eser
voir
nam
e
vf "So
16
Mon
roeL
ake
CD
MI
2-
- 1
(O
O"
8- » o" s- i | jf
17
Mor
se R
eser
voir
D> Z
- ..._
____
(5* 1 3 O i 1 ! f
18
Pato
kaL
ake
a S
a. i § s (D i
Dat
e of
co
llect
ion
(mon
th/d
ay/
year
)
Col
lec
tio
n tim
e (2
4-
hour
)
Spec
ific
W
ater
co
nduc
t-
tem
pera
- PH
an
ce
ture
(s
tand
ard
(liS
/cm
) (°
C)
units
)
Nitr
ite
plus
ni
trat
e as
N
itrite
as
nitro
gen
nitro
gen
(mg/
L)
(mg/
L)
Orth
o-
Am
mo-
ph
osph
ate
nium
as
as p
hos-
ni
trog
en
phor
us
(mg/
L)
(mg/
L)
Silic
a as
Si
02(m
g/L)
Indi
ana C
ontin
ued
05/0
6/92
07/0
7/92
08/2
5/92
10/2
1/92
01/1
3/93
03/2
5/93
07/0
8/93
09/0
1/93
05/0
7/92
07/0
6/92
08/2
5/92
10/2
7/92
01/0
7/93
03/2
9/93
07/0
9/93
09/0
3/93
05/0
6/92
07/0
7/92
08/2
5/92
10/2
2/92
01/1
3/93
1200
1115
0800
1600
1615
1045
1900
1200
1230
1540
1715
1230
1105
1530
1000
1200
1520
1500
1145
1000
1415
190
193
196
205
186
190
186
186
484
328
419
446
447
446
446
400
226
220
226
228
200
14.5
23.0
24.5
16.0 3.5
4.0
24.0
25.5
16.0
25.0
2M 14.0 4.0
9.0
27.0
25.5
14.5
25.5
26.0
15.5 4.0
7.5
7.0
7.0
7.5
7.0
7.8
7.0
7.2
8.8
7.6
-7JB 8.
48.
2
8.1
8.2
8.0
8.0
8.2
8.2
7.6
7.4
0.06
<0
.01
<.05
<.
01<.
05
<.01
.07
<.01
.11
<.01
.25
<.01
<.05
<.
01<.
05
.03
8.7
.06
5.3
.17
3,0
.06
2.8
.114.
8 .0
4
6.3
.03
2.6
.06
1.7
.03
.26
<.01
<.05
<.
01<.
05
<.01
<.05
<.
01.1
4 .0
2
0.03
<0
.01
.04
<.01
.09
<.01
.10
<.01
.02
<.01
.02
<.01
.13
<.01
.21
.02
<.01
.0
1.0
2 .01
.07
<.01
.03
<.01
.08
.07
.05
.03
.04
.01.0
8 <.
01
.04
<.01
.03
<.01
.04
<.01
.26
<.01
.09
<.01
1.5
1.9
3.6
3.8
1.5
3.3
3.2
4.3
4.0
2.5
4.9
1.5
6.3
5.4
2.0 .9 .9 .4 1.2
1.8
8.7
Tabl
e 8.
P
hysi
cal p
rope
rties
and
ana
lytic
al r
esul
ts fo
r nut
rient
s co
llect
ed fr
om 7
6 re
serv
oirs
in th
e M
idw
este
rn U
nite
d S
tate
s, A
pril
1992
thro
ugh
Sep
tem
ber
1993
Con
tinue
d
Dat
e of
co
llect
ion
Map
no.
(m
onth
/day
/ (f
ig. 1
) R
eser
voir
nam
e ye
ar)
Col
lec
tio
n tim
e (2
4-
hour
)
Spec
ific
Wat
er
cond
uct-
te
mpe
ra-
ance
tu
re
(uS/
cm)
(°C)
PH
(sta
ndar
d un
its)
Nitr
ite
plus
ni
trat
e as
ni
trog
en
(mg/
L)
Nitr
ite a
s ni
trog
en
(mg/
L)
Am
mo
ni
um a
s ni
trog
en
(mg/
L)
Orth
o-
phos
phat
e as
pho
s
phor
us
(mg/
L)
Silic
a as
Si
O2
(mg/
L)In
dian
a C
ontin
ued
TJ f
8 | s. 8 0) 0. 1 5 o 2. 30 I S> ^ z i i 1 i (D #
18
Pato
ka L
ake
Con
tinue
d 03
/25/
9307
/13/
9309
/14/
93
19
Sala
mon
ie L
ake
05/0
5/92
07/1
4/92
08/2
6/92
10/2
6/92
01/1
1/93
03/2
3/93
07/1
2/93
09/1
6/93
20
Cor
alvi
lle L
ake
04/2
9/92
06/3
0/92
08/2
4/92
10/1
9/92
01/2
0/93
03/2
4/93
07/1
6/93
09/0
1/93
0800
1145
1200
1530
1600
1550
1730
1600
1415
1630
0930
1330
1230
1745
1200
1000
1045
1552
1300
203
150
233
465
422
413
452
403
427
389
356
548
562
590
505
660
347
394
377
4.0
23.5
23.0
12.5
20.0
23.0
12.0 2.5
2.0
22.5
21.5
Iow
a
12.0
23.5
23.5
10.5 .5 1.0
23.0
24.5
8.2
7.4
7.3
8.1
7.6
7.9
7.9
7.5
8.2
7.6
7.5
8.0
8.4
8.2
8.3
8.1
7.7
7.6
8.2
0.22 .1
3<.
05
5.4
5.4
2.5 1.6
2.4
2.9
5.2
1.2
9.9
6.0
5.5
3.0
7.8
2.7
4.5
3.4
<0.0
1<.
01<.
01 .06
.36
.12
.04
.04
.02
.23
<.01 .0
4.1
5.0
8.2
7.0
4
.04
.19
.22
0.04 .1
5.0
6
.15
.33
.29
.12
.29
.19
.12
.03
.04
.18
.20
.13
.16
.71
.05
.04
<0.0
1<.
01<.
01 .07
.05
.03
.03
.06
.13
.09
.02
.12
.09
.13
.05
.09
.29
.13
.12
1.6
1.5
1.5
4.4
4.4
5.4
4.5
7.2
5.6
5.0
4.3
14 12 10 4.9
16 9.8
13 14
8
> o
o
o
Tabl
e 8.
P
hysi
cal p
rope
rties
and
ana
lytic
al r
esul
ts fo
r nu
trien
ts c
olle
cted
from
76
rese
rvoi
rs in
the
Mid
wes
tern
Uni
ted
Sta
tes,
Apr
il 19
92 th
roug
h S
epte
mbe
r 19
93 C
ontin
ued
"
O
<n
« »
ro 3
H g |
Map
no.
10
8,
(fig-
1)
Res
ervo
ir n
ame
Dat
e of
co
llect
ion
(mon
th/d
ay/
year
)
Col
lec
tio
n tim
e (2
4-
hour
)
Spec
ific
W
ater
co
nduc
t-
tem
pera
- an
ce
ture
pH
(sta
ndar
d un
its)
Nitr
ite
plus
ni
trat
e as
ni
trog
en
(mg/
L)
Am
mo-
N
itrite
as
nium
as
nitr
ogen
ni
trog
en
(mg/
L)
(mg/
L)
Ort
ho-
phos
phat
e as
pho
s
phor
us
(mg/
L)
Silic
a as
Si
O2
(mg/
L)(0
«?
Iow
a C
ontin
ued
"5 H
. 21
La
ke P
anor
ama
A
5T3
&
I 3
-<§
o| « (D oj » i CT 2. f
22
Lake
Red
Roc
kn> 0. z £ 5- a 5"
O 3 h £
23
Rat
hbun
Lak
e1 5! I ? 3 3) O «
04/3
0/92
06/3
0/92
08/2
5/92
10/1
6/92
01/2
2/93
03/2
2/93
07/2
7/93
08/3
1/93
04/3
0/92
07/0
1/92
08/2
5/92
10/1
3/92
01/2
1/93
03/2
3/93
07/1
6/93
08/3
0/93
04/3
0/92
07/0
2/92
08/1
2/92
10/1
4/92
01/2
1/93
1740
1800
0930
0745
0900
1615
1715
0810
1200
1100
1615
1445
1500
0935
1305
1700
1700
0900
1530
0720
1215
612
548
547
574
735
290
568
508
540
600
598
434
756
445
425
509
247
251
250
169
178
11.5
26.5
23.0 8.5 .5 2.0
23.0
22.0
10.0
22.5
23.5
18.0 1.0
1.5
23.0
25.0
10.5
23.0
24.0
17.0 2.0
8.2
8.5
8.2
8.6
8.1
7.7
8.0
8.2
8.2
8.5
8.2
8.2
8.0
7.8
7.7
8.5
7.9
8.0
7.9
8.2
7.7
10 8.2
5.6
5.1
10 1.9
7.6
5.9
8.3
7.8
6.3
2.3
9.0
3.3
4.5
4.8 .6
1.7
0.3
2.4
7.5
5
0.05 .1
3.1
1.0
8.0
4
.03
.07
.10
.04
.48
.21
.05
.03
.04
.16
.11 .01
.01
.02
.01
.03
0.08 .1
0.3
9.0
7.0
8
.24
.04
.10
.09
.06
.07
.03
.07
.49
.03
.03
.11
.06
.03
.02
.03
0.08 .0
2.0
1.0
3.1
0
.73
.13
.12
.09
.13
.06
.09
.11
.34
.13
.12
.02
.07
.01
.04
.12
-- 1.6
19 3.0
20 9.0
19 17 1.4
10 11 12 20 12 14 19 1.6
2.1 .9 3.8
5.7
Tabl
e 8.
P
hysi
cal p
rope
rties
and
ana
lytic
al r
esul
ts fo
r nu
trien
ts c
olle
cted
from
76
rese
rvoi
rs in
the
Mid
wes
tern
Uni
ted
Sta
tes,
Apr
il 19
92 th
roug
h S
epte
mbe
r 19
93 C
ontin
ued
Map
no.
(f
ig. 1
) R
eser
voir
nam
e
Dat
e of
co
llect
ion
(mon
th/d
ay/
year
)
Col
lec
tio
n tim
e (2
4-
hour
)
Spec
ific
co
nduc
t
ance
((
iS/c
m)
Wat
er
tem
pera
tu
repH
(s
tand
ard
units
)
Nitr
ite
plus
ni
trat
e as
ni
trog
en
(mg/
L)
Nitr
ite a
s ni
trog
en
(mg/
L)
Am
mo
ni
um a
s ni
trog
en
(mg/
L)
Ort
ho-
phos
phat
e as
pho
s
phor
us
(mg/
L)
Silic
a as
Si
O2
(mg/
L)Io
wa C
ontin
ued
23
Rat
hbun
Lak
e 3
Con
tinue
da> o 2L T
l
.§
24
Sayl
orvi
lle L
ake
S 0 3
Q.
0_
I 3) <D
CO C ST 0 c 25
C
linto
n La
keS? (D * o 8 ro 5 to 3"
03/2
3/93
07/2
7/93
08/3
0/93
04/3
0/92
06/3
0/92
08/2
5/92
10/1
6/92
01/2
2/93
03/2
2/93
07/1
6/93
08/3
1/93
05/0
1/92
06/2
6/92
08/2
4/92
10/2
6/92
01/1
9/93
03/2
2/93
07/1
3/93
08/3
0/93
1300
1200
1210
1515
2000
1115
1120
1100
1325
1000
1010
0930
0830
1040
1030
1310
1200
1005
1105
188
189
183
666
628
680
703
892
558
460
552
326
320
295
315
290
330
302
251
3.0
23.0
25.0
10.0
23.5
23.5 7.5 1.5
1.5
22.0
23.5
Kan
sas
16.0
21.5
25.5
15.5 3.0
5.5
26.0
27.5
8.5
7.3
7.6
8.2
8.3
8.4
8.6
8.2
8.3
7.7
8.5
8.3
7.9
8.2
8.9
8.8
8.0
8.1
8.0
0.52 .7
4.5
8
12 11 5.9
2.4
9.8
4.3
4.9
7.7 .3
7.2
2<.
05<.
05 .37
.48
.25
<.05
<0.0
1<.
01<.
01 .03
.10
.06
.19
.04
.06
.09
.08
.01
.02
<.01 .0
1.0
2
.01
<.01 .0
1
0.02 .0
3.0
4
.02
.12
.13
.43
.09
.52
.04
.05
.12
.06
.03
.02
.10
.02
.03
.13
0.04 .0
3.0
4
.09
.09
.02
.04
.04
.38
.16
.12
.02
<.01
<.01
<.01 .0
3
<.01
<.01
<.01
6.6
5.0
5.4
19 21 8.5
15 23 16 18 22 8.1 1.4 .7 .7 3.6
4.5
3.8
3.1
o Ta
ble
8. P
hysi
cal p
rope
rties
and
ana
lytic
al r
esul
ts fo
r nu
trien
ts c
olle
cted
from
76
rese
rvoi
rs in
the
Mid
wes
tern
Uni
ted
Sta
tes,
Apr
il 19
92 th
roug
h
TJ
0 n ro 3
H
3 §
Map
no.
,§
S (f
i'9-1
) R
eser
voir
nam
e
Dat
e of
co
llect
ion
(mon
th/d
ay/
year
)
Col
lec-
Sp
ecif
ic
tiont
ime
cond
uct-
(2
4-
ance
ho
ur)
(|iS/
cm)
Wat
er
tem
pera
tu
rePH
(s
tand
ard
units
)
Nitr
ite
plus
ni
trat
e as
ni
trog
en
(mg/
L)
Nitr
ite a
s ni
trog
en
(mg/
L)
Am
mo
ni
um a
s ni
trog
en
(mg/
L)
Orth
o-
phos
phat
e as
pho
s
phor
us
(mg/
L)
Silic
a as
Si
O2
(mg/
L){/>
&
Kan
sas C
ontin
ued
"S |
26
Hill
sdal
e La
ke3
&
I i
25 o 0
8- » X i o_ 8- I ?~ 27
K
anop
olis
Lak
e0) a z £ § 5" O i i H |
28
Milf
ord
Lake
s a i 3 0 o 3
05/0
5/92
06/2
5/92
08/2
8/92
10/2
7/92
01/1
1/93
03/2
3/93
07/2
9/93
08/3
1/93
05/0
7/92
06/3
0/92
08/2
7/92
10/2
9/92
01/1
5/93
03/2
6/93
07/0
8/93
09/0
3/93
05/0
5/92
06/2
9/92
08/2
5/92
10/2
9/92
01/1
3/93
1100
1100
1130
1100
1145
1145
1615
1340
1015
1230
0830
0900
0950
0820
1600
0930
1530
1200
1345
1400
1310
336
321
310
326
254
276
270
245
1,25
097
467
289
01,
050
789
935
656
617
660
514
478
535
18.0
22.0
22.5
15.5 2.0
5.0
26.5
25.5
16.0
23.0
22.5
13.0 2.0
6.5
25.5
24.5
15.0
23.0
24.5
14.0 1.5
8.3
7.8
7.8
7.9
8.0
8.5
7.7
7.3
8.3
7.9
8.1
8.0
8.2
8.2
8.0
7.9
8.2
7.8
7.9
8.3
8.7
0.24 .5
3.1
0<.
05 .44
.67
.41
.07
.05
.32
.49
.59
.80
1.0 .51
.10
.08
.21
.62
.83
1.1
0.01 .0
2<.
01<.
01 .02
.01
<.01 .0
1
<.01 .1
0<.
01 .02
.02
.03
.01
.03
<.01 .0
1<.
01<.
01 .01
0.06 .0
6.0
8.0
1.1
1
.06
.05
.46
.05
.06
.02
.05
.05
.13
.06
.12
.10
.12
.03
.01
.06
<0.0
1.0
2.0
1.0
3.0
7
.04
.01
.02
.01
.03
.11 .06
.05
.09
.05
.09
.03
.12
.15
.16
.17
0.8
2.2
1.6 .9 3.9
4.9
2.4
4.0
1.1
5.7
11 12 11 13 9.5
17 1.5
10 9.9
9.3
13
Tabl
e 8.
P
hysi
cal p
rope
rtie
s an
d an
alyt
ical
res
ults
for
nutr
ient
s co
llect
ed f
rom
76
rese
rvoi
rs in
the
Mid
wes
tern
Uni
ted
Sta
tes,
Apr
il 19
92 th
roug
h S
epte
mbe
r 1
99
3 C
on
tinu
ed
Map
no.
(fi
g. 1
) R
eser
voir
nam
e
Dat
e of
co
llect
ion
(mon
th/d
ay/
year
)
Col
lec
tio
n tim
e (2
4-
hour
)
Spec
ific
Wat
er
cond
uct-
te
mpe
ra-
ance
*"
» (u
S/cm
) (°
C)
PH
(sta
ndar
d un
its)
Nitr
ite
plus
ni
trate
as
nitr
ogen
(m
g/L)
Nitr
ite a
s ni
troge
n (m
g/L)
Am
mo
ni
um a
s ni
trog
en
(mg/
L)
Orth
o-
phos
phat
e as
pho
s
phor
us
(mg/
L)
Silic
a as
Si
02(m
g/L)
Kan
sas C
onti
nued
28
Milf
ord
Lak
e
3
Con
tinue
dCO 8 1
29
Perr
y L
ake
3 to a. fiL 8 3J (D
CO c_ 1 z 5. 30
Po
mon
a L
ake
1 sr > TJ i =? 3 to V)
9
03/2
4/93
07/1
9/93
09/0
1/93
05/0
1/92
06/2
6/92
08/2
8/92
10/2
6/92
01/1
9/93
03/2
2/93
07/2
5/93
08/3
0/93
05/0
5/92
06/2
5/92
08/2
4/92
10/2
7/92
01/1
1/93
03/2
3/93
07/2
9/93
08/3
1/93
1600
1605
1705
1250
1100
0900
1230
0955
1510
2030
1330
0830
0830
1400
0900
1600
1500
1210
1030
479
472
366
350
361
298
294
365
348
260
249
296
394
330
332
316
335
191
242
5.0
27.0
25.5
14.0
19.0
23.5
17.5 2.0
4.5
25.0
26.0
17.0
21.0
24.0
14.0 2.5
7.5
23.5
26.5
8.2
8.0
7.8
8.0
7.8
8.0
8.6
7.6
8.2
7.8
7.6
8.0
7.8
7.9
8.5
7.9
8.3
7.3
7.9
1.2
1.0 .5
0
.82
.77
.52
.51
.99
.94
1.3 .3
7
.96
.77
.32
.29
.58
.72
.50
.06
0.02
<.01
<.01 .0
2.0
2.0
2<.
01 .02
.02
<.01 .0
2
.04
.01
<.01
<.01 .0
2
.01
<.01
<.01
0.24 .0
4.0
4
.14
.12
.07
.02
.14
.07
.03
.14
.09
.03
.04
.03
.09
.05
.03
.07
0.17 .1
7.2
2
.03
<.01 .0
4.0
5.0
7
.06
.09
.09
.04
.02
.01
.03
.07
.05
.07
.01
12 12 16 2.8
7.4
6.2
7.2
11 10 10 10 5.2
5.7
3.4
3.3
8.1
7.9
9.7
2.8
ff CT
(D
o Ta
bled
. P
hysi
cal
!! S
epte
mbe
r 19
93 C
ontin
ued
and
anal
ytic
al r
esul
ts fo
r nu
trien
ts c
olle
cted
from
76
rese
rvoi
rs in
the
Mid
wes
tern
Uni
ted
Sta
tes,
thro
ugh
ncentratlons
of
Sel<
ril
1992
Through Se f"0 S _| si co
Q.
CO
Q_ ° <> & i S 1 Q> a z 1 ff 3 O 3 i 3 3 i a a i s 5 « s i
Dat
e of
co
llect
ion
Map
no.
(m
onth
/day
/ (fi
g. 1
) R
eser
voir
nam
e ye
ar)
Col
lec
tio
n tim
e (2
4-
hour
)
Spec
ific
co
nduc
t
ance
(ja
S/cm
)
Wat
er
tem
pera
tu
rePH
(s
tand
ard
units
)
Nitr
ite
plus
ni
trate
as
nitr
ogen
(m
g/L)
Ort
ho-
Am
mo-
ph
osph
ate
Nitr
ite a
s ni
um a
s as
pho
s-
nitr
ogen
ni
trog
en
phor
us
(mg/
L)
(mg/
L)
(mg/
L)
Silic
a as
Si
O2
(mg/
L)K
ansa
s C
ontin
ued
31
Tut
tle C
reek
Lak
e 05
/05/
9206
/29/
9208
/25/
9210
/30/
9201
/13/
93
03/2
4/93
07/1
9/93
09/0
1/93
32
Wac
onda
Lak
e 05
/06/
9206
/29/
9208
/26/
9210
/287
9201
/14/
93
03/2
5/93
07/0
8/93
09/0
2/93
33
Wils
on L
ake
05/0
6/92
06/3
0/92
08/2
6/92
10/2
8/92
01/1
4/93
1200
1000
1115
0830
1145
1150
1220
1150
1000
1630
0915
120(
T09
15
1145
0845
0920
1250
1000
1300
1400
1430
419
517
270
360
562
180
262
221
870
907
703
715
773
780
808
574
4,10
03,
760
3,98
03,
890
3,71
0
15.5
21.5
24.5
13.5 1.5
4.0
24.0
25.5
14.5
25.5
22.0
1471 1.5
4.0
24.0
25.0
15.5
21.0
23.0
16.0 2.5
8.6
8.0
7.8
8.0
8.4
7.8
7.6
7.4
8.3
7.8
8.1
3:3
8.3
7.9
7.8
7.9
8.2
8.0
8.2
8.4
8.4
0.79
1.2 .8
61.
11.
6 .95
2.0 .8
6
.07
.33
.15
.28
.51
.75
.65
.28
<.05 .1
1<.
05 .07
.10
0.01 .0
2<.
01<.
01 .03
.05
<.01
<.01
<.01 .0
4.0
1.O
T.0
2
.02
.12
.03
<.01 .0
2<.
01 .01
.01
0.04 .0
4.0
1<.
01 .09
.62
.03
.05
.04
.19
.06
.03
.08
.21
.05
.06
.01
.07
.05
.03
.06
0.09 .1
3.2
0.1
9.1
7
.16
.15
.21
<.01 .0
4.0
3.0
4.0
2
.06
.03
.13
<.01
<.01
<.01 .0
1<.
01
7.8
7.7
12 12 17 7.8
11 14
.9 4.2
5.9
6.2
7.0
9.3
3.2
14 7.5
7.8
8.7
7.9
9.4
Tabl
e 8.
P
hysi
cal p
rope
rties
and
ana
lytic
al r
esul
ts fo
r nu
trien
ts c
olle
cted
from
76
rese
rvoi
rs in
the
Mid
wes
tern
Uni
ted
Sta
tes,
Apr
il 19
92 th
roug
h S
epte
mbe
r 19
93 C
ontin
ued
Dat
e of
co
llect
ion
Map
no.
(m
onth
/day
/ (f
ig. 1
) R
eser
voir
nam
e ye
ar)
Col
lec-
Sp
ecif
ic
Wat
er
tiont
ime
cond
uct-
te
mpe
ra-
PH
(24-
an
ce
ture
(s
tand
ard
hour
) (u
S/cm
) (°
C)
units
)
Nitr
ite
plus
ni
trat
e as
N
itrite
as
nitr
ogen
ni
trog
en
(mg/
L)
(mg/
L)
Ort
ho-
Am
mo-
ph
osph
ate
nium
as
as p
hos-
ni
trog
en
phor
us
(mg/
L)
(mg/
L)
Silic
a as
Si
O2
(mg/
L)K
ansa
s C
ontin
ued
o w g to 1 H w tt a 3 2 0> 3D c_
w 3- z
c 3 y o jo s 1 (O i>
33
Wils
on L
ake
03
/25/
93C
ontin
ued
07/0
8/93
09/0
2/93
34
Cro
ss L
ake
05/0
5/92
06/1
9/92
08/1
9/92
11/0
5/92
01/2
6/93
03/2
5/93
07/2
1/93
09/0
7/93
35
Gul
l Lak
e R
eser
voir
05/1
3/92
06/3
0/92
08/1
8/92
11/0
3/92
01/0
5/93
03/1
5/93
07/1
3/93
09/2
1/93
1605
1230
1420
1230
1130
1300
0915
0930
0910
1040
1510
1045
0930
1030
1120
0915
1130
1000
3,29
02,
590
1,69
0
143
215
214
244
287
335
169
172
238
210
208
230
250
260
230
233
5.0
25.0
24.5
Min
neso
ta
17.0
18.0
23.5 4.5
1.0
1.0
23.5
20.0
11.0
20.0
20.5 3.0
-- ~ 19.5
14.5
8.2
8.1
7.7
7.7
8.4
8.6
7.6
8.8
7.1
7.3
8.4
8.3
8.5
8.1
8.2
8.0
7.9
8.4
8.0
0.20
<0
.01
.25
.02
.07
.02
.05
<.01
.06
<.01
<.05
<.
01.1
0 <.
01.4
5 .0
3
.56
.01
.10
<.01
.14
.01
.06
<.01
<.05
<.
01<.
05
<.01
<.05
<.
01.0
6 .0
3
.08
<.01
<.05
<.
01<.
05
<.01
0.02
<0
.01
.07
<.01
.15
.04
.02
<.01
.14
.03
.02
<.01
.03
<.01
.16
.01
.11
<.01
.05
.05
.05
.06
.03
<.01
.03
<.01
<.01
<.
01<.
01
<.01
.06
<.01
.01
<.01
.03
<.01
.05
<.01
9.7
9.9
15 5.5
4.7
6.6
6.4
14 16 9.6
12 2.1
2.8
3.3
-- 2.1
2.1
2.3
5.3
o (O
Tabl
e 8.
P
hysi
cal p
rope
rties
and
ana
lytic
al r
esul
ts fo
r nu
trien
ts c
olle
cted
from
76
rese
rvoi
rs in
the
Mid
wes
tern
Uni
ted
Sta
tes,
Apr
il 19
92 th
roug
h
Concentrations
of
Se
April 1992
Throu
gh S IS I* CT -
r If l§ S « 9 3- 0 Q
. 2 tr o X
$ o> Q.
Z ^t O i 8 3 1 S ! 1 3J 1
Dat
e of
co
llect
ion
Map
no.
(m
onth
/day
/ (f
ig. 1
) R
eser
voir
nam
e ye
ar)
Col
lec
ti
on ti
me
(24-
ho
ur)
Spec
ific
co
nduc
t
ance
(u
.S/c
m)
Wat
er
tem
pera
tu
repH
(s
tand
ard
unit
s)
Nitr
ite
plus
ni
trat
e as
ni
trog
en
(mg/
L)
Nitr
ite a
s ni
trog
en
(mg/
L)
Am
mo
ni
um a
s ni
trog
en
(mg/
L)
Ort
ho-
phos
phat
e as
pho
s
phor
us
(mg/
L)
Silic
a as
Si
O2
(mg/
L)M
inne
sota
C
onti
nued
36
Lac
Qui
Par
le R
eser
voir
05
/06/
92
06/1
8/92
08/2
0/92
11/0
4/92
01/2
0/93
03/2
4/93
07/2
2/93
09/0
9/93
37
Lee
ch L
ake
Res
ervo
ir
05/1
4/92
07/0
1/92
08/1
9/92
11/0
2/92
01/0
6/93
03/1
6/93
07/1
4/93
09/2
2/93
38
Pine
Riv
er R
eser
voir
05
/13/
92
06/3
0/92
08/1
8/92
11/0
3/92
01/0
5/93
1030
1330
1230
1100
1200
0930
1010
1210
0930
0900
1000
1245
0930
0945
0830
0930
1330
1015
1200
1230
1240
904
384
930
957
1,14
0
1,32
089
488
1
168
260
260
272
290
310
279
258
240
228
202
212
235
14.0
20.5
23.0 1.5
1.0
3.0
22.0
18.5
15.0
16.5
20.5 3.0
0 0 19.0
12.5
12.0
19.0
22.0 3.0
0
8.4
7.5
8.2
8.6
8.7
7.8
7.7
8.2
8.1
8.1
7.9
8.2
8.1
8.1
8.1
8.3
8.4
8.5
8.7
8.1
8.0
0.80
2.1 .1
4.4
9.7
2
.55
.81
1.2
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05 .0
7
0.02 .0
6.0
2.0
1.0
3
.01
.02
.02
<.01 <oi
<.01
<.01 .0
2
<.01
<.01 <oi
<.01
<.01
<.01 .0
1.0
2
0.01 .1
5.1
6
.07
.27
.29
.09
.06
.03
.05
<.01
<.01 .0
3
.01
.02
.02
.03
.02
<.01 .0
2.0
4
<0.0
1
.14
.05
.06
.11
.08
.11
.10
<.01 <oi
<.01
<.01
<.01
<.01
<.01 <oi
<.01
<.01
<.01
<.01
<.01
2.7
10 25 20 23 25 22 21 5.7
7.4
8.4
9.6
9.8
10 7.5
10 7.7
5.2
5.5
7.9
7.3
Tabl
e 8.
P
hysi
cal p
rope
rties
and
ana
lytic
al r
esul
ts fo
r nu
trien
ts c
olle
cted
from
76
rese
rvoi
rs in
the
Mid
wes
tern
Uni
ted
Sta
tes,
Apr
il 19
92 th
roug
h S
epte
mbe
r 19
93 C
ontin
ued
TJ 2 o' SL TJ 5 "g a. $ § Q.
I fT SL 3D CO ff 3- z 5* of
| ro I (Q 8? o *
1
Dat
e of
co
llect
ion
Map
no.
(m
onth
/day
/ (fi
g. 1
) R
eser
voir
nam
e ye
ar)
38
Pine
Riv
er R
eser
voir
03
/15/
93C
ontin
ued
07/1
3/93
09/2
1/93
39
Sand
y L
ake
Res
ervo
ir
05/1
4/92
07
/02/
9208
/20/
92
11/0
4/92
01/0
7/93
03/1
7/93
07
/15/
9309
/23/
93
40
Win
nibi
gosh
ish
Res
ervo
ir
05/1
4/92
07/0
1/92
08/1
9/92
11
/02/
9201
/06/
93
03/1
6/93
07/1
4/93
09/2
2/93
Col
lec
tio
n tim
e (2
4-
hour
)
1045
1300
1145
0930
08
4008
15
0900
0915
0845
08
1508
15
1200
1000
1115
10
1510
40
0835
1000
1045
Spec
ific
co
nduc
t
ance
(u
S/cm
)
Wat
er
tem
pera
tu
repH
(s
tand
ard
units
)M
inne
sota
C
ontin
ued
265
0 8.
022
522
2
112
110
120
120
130
178
117
117
310
280
273
278
310
335
290
275
20.0
14.5
14.0
16
.520
.0
4.0
0 0 19.5
13.0
15.0
17.5
20.5
4.
50 0 19
.012
.5
8.4
8.2
7.8
7.9
7.4
7.7
7.5
7.2
7.6
7.7
8.4
8.5
8.5
8.4
8.2
8.1
8.4
8.5
Nitr
ite
plus
ni
trat
e as
ni
trog
en
(mg/
L)
0.06
<.05
<.05 .0
9 <.
05<.
05
.05
.12
.26
<.05
<.05
<.05
<.05
<.05
<.
05<.
05
<.05
<.05
<.05
Orth
o-
Am
mo-
ph
osph
ate
Nitr
ite a
s ni
um a
s as
pho
s-
Silic
a as
ni
troge
n ni
troge
n ph
orus
Si
O2
(mg/
L)
(mg/
L)
(mg/
L)
(mg/
L)
<0.0
1 <0
.01
<.01
.0
2<.
01
.02
<.01
.0
5 <.
01
.04
.01
.09
.02
.12
<.01
.0
2 <.
01
.03
<.01
.0
2
<.01
.0
3<.
01
.03
<m
<ol
.02
.03
<.01
.0
1<.
01
.02
<.01
.0
1
<0.0
1 8.
4<.
01
6.4
<.01
7.
6
<.01
6.
9 <.
01
3.8
<.01
3.
8 <.
01
1.6
.02
3.4
.01
4.4
<.01
2.
4<.
01
2.6
<.01
1.
9<.
01
2.1
<.01
5.
6 <.
01
3.3
<.01
4.
3
<.01
4.
9<.
01
5.4
<.01
3.
2
Tabl
e 8.
P
hysi
cal p
rope
rties
and
ana
lytic
al r
esul
ts fo
r nu
trien
ts c
olle
cted
from
76
rese
rvoi
rs in
the
Mid
wes
tern
Uni
ted
Sta
tes,
Apr
il 19
92 th
roug
h
a
o-i
3
z§ 10 u
d -
2 |
Map
no.
<o a
(f
ig-1
) R
eser
voir
nam
e
Stf
(D
(p"S
o 41
H
amso
nvill
e L
ake
|a ""*'
2!<o
2.
"1 (D o" f 2 1 y 3
42
Har
ry S
Tru
man
z
Res
ervo
ir5* 3 5f 5'
O 1 d 5 3 E 8 43
L
ong
Bra
nch
Lak
e
2
S.' i 0) CD 3D (D i
Dat
e of
co
llect
ion
(mon
th/d
ay/
year
)
04/3
0/92
07/0
9/92
08/1
3/92
10/2
2/92
01/2
7/93
02/1
2/93
03/2
4/93
07/1
2/93
09/3
0/93
05/0
5/92
07/0
9/92
08/2
5/92
10/1
4/92
03/1
0/93
06/1
6/93
09/1
7/93
05/0
5/92
07/1
5/92
08/2
4/92
10/2
1/92
01/0
7/93
Col
lec
tio
n tim
e (2
4-
hour
)
1030
1000
1030
1030
1135
1100
1400
1230
1035
1040
1430
1100
1300
1630
0945
1130
1500
1700
1700
1415
1450
Spec
ific
W
ater
co
nduc
t-
tem
pera
- an
ce
t"re
(u
S/cm
) (°
C)
308
294 --
287
262 _
260
191
210
347
327
255
277
323 ._
232
212
220
211 -
174
Mis
sour
i
16.5
27.0
-- 16.0 2.0
_ 6.0
24.5
19.0
17.0
26.0
29.0
20.0 5.5
22.3
16.5
25.0
24.0
15.0 .5
pH
(sta
ndar
d un
its)
8.5
8.2
-- -- 7.8
_ 7.2
6.6
7.8
8.2
8.2
7.6^
7.8
7.8
__ 7.2
8.0
7.6
7.7
8.0
7.3
Nitr
ite
plus
ni
trat
e as
ni
trog
en
(mg/
L)
0.79
<.05
<.05
<.05 .9
8
.06
.25
.76
.25
.46
.49
<.05 .1
6.5
6
.42
.09
.27
.54
.06
.12
.31
Nitr
ite a
s ni
trog
en
(mg/
L)
0.02
<.01
<.01 .0
1.0
3
<.01 .0
3.0
9.0
3
.02
.01
<;oi
<.01
<.01 .0
1.0
5
.01
.02
<.01 .0
1.0
1
Am
mo
ni
um a
s ni
trog
en
(mg/
L)
<0.0
1 .02
<.01 .0
4.1
6
.01
.16
.08
.16
.03
.02 :o2 .03
.04
.04
.15
.03
.07
.09
.03
.15
Ort
ho-
phos
phat
e as
pho
s
phor
us
(mg/
L)
<0.0
1<.
01<.
01<.
01 .10
<.01 .0
4.0
6.0
4
<.01
<.01 .0
1<.
01 .02
.06
.05
<.01
<.01 .0
1<.
01 .03
Silic
a as
Si
O2
(mg/
L)
-- 1.5
1.4
1.7
4.8
__ 5.5
4.8
3.9
2.0
2.8
4.2
2.3
-- 5.5
__
.1 1.9
1.6
<.l 3.9
Tabl
e 8.
P
hysi
cal p
rope
rties
and
ana
lytic
al r
esul
ts fo
r nu
trien
ts c
olle
cted
from
76
rese
rvoi
rs in
the
Mid
wes
tern
Uni
ted
Sta
tes,
Apr
il 19
92 th
roug
h S
epte
mbe
r 19
93 C
ontin
ued
o
ar CO I o
5 I CO Q> Q. SL o' 9L c_ ^ z 5'
1 o _L CO s I (Q i 3.
Dat
e of
co
llect
ion
Map
no.
(m
onth
/day
/ (f
ig. 1
) R
eser
voir
nam
e ye
ar)
43
Lon
g B
ranc
h L
ak
e
03/2
2/93
Con
tinue
d 07
/01/
93
09/2
3/93
44
Mar
k T
wai
n L
ake
05/0
6/92
07
/15/
9208
/24/
92
10/2
2/92
01/0
7/93
03/2
2/93
06/2
3/93
09
/15/
93
45
Pom
me
de T
erre
Lak
e 05
/06/
9207
/08/
92
08/2
5/92
10/1
4/92
03/1
0/93
06/1
6/93
09/1
7/93
Col
lec
tio
n tim
e (2
4-
hour
)
1310
0830
0900
1300
13
0014
20
0750
0845
1115
1500
13
30
1240
1400
13
4515
0015
00
0800
1000
Spec
ific
co
nduc
t
ance
(u
S/cm
)
Wat
er
tem
pera
tu
rePH
(s
tand
ard
units
)M
isso
uri C
onti
nued
175
6.0
7.2
171
134
430
267
262
232
194
198
283
313
285
298
232
302
24.5
19.0
14.5
28
.025
.5
15.0 1.5
6.5
-~ 12.0
14.0
27
.020
.5 5.0
17.0
7.1
8.0
8.0
7.5
7.7
8.0
7.5
7.3
7.6
7.6
7.8
7.8
8.0
7.9
7.2
Nitr
ite
plus
ni
trat
e as
ni
trog
en
(mg/
L)
0.43 .5
5
.32
1.0
<.05 .2
3 .1
2.6
1
.88
1.0 .2
6
.55
.12
<.05
<.05 .5
9
.20
.20
Nitr
ite a
s ni
trog
en
(mg/
L)
<0.0
1.0
1
<.01 .0
1
.02
.01
.01
<.01 .0
2
<.01 .0
2
.01
<.01 .0
1.0
2
Ort
ho-
Am
mo-
ph
osph
ate
nium
as
as p
hos-
ni
trog
en
phor
us
(mg/
L)
(mg/
L)
0.13 .0
4.0
5
.03
.05
.09
.06
.02
.02
.04
.05
.05
.35
.02
.08
.02
.28
.55
0.02 .0
1.0
2
.03
.02
.05
.09
.07
.05
<.01 .0
2
<.01 .0
6
.08
.06
Silic
a as
S
i02
(mg/
L)
6.4
1.4
3.3
3.6
1.0
2.6
1.9
5.1
7.9
6.0
5.6 .7 2.0
1.1
1.8
~ 2.5
~
> o
o
o
Tabl
e 8.
P
hysi
cal p
rope
rties
and
ana
lytic
al r
esul
ts fo
r nu
trien
ts c
olle
cted
from
76
rese
rvoi
rs in
the
Mid
wes
tern
Uni
ted
Sta
tes,
Apr
il 19
92 th
roug
h S
epte
mbe
r 19
93 C
ontin
ued
mcentrations
of
Self
Til
1992
Through Se ts._|
^ 3
-(0
O I 1 1 y CD 0
. z f 1 5'
O | § 3 3 £ I Z Q. i
Dat
e of
co
llect
ion
Map
no.
(m
onth
/day
/ (f
ig. 1
) R
eser
voir
nam
e ye
ar)
Col
lec
ti
on ti
me
(24-
ho
ur)
wJj
GC
ITIC
cond
uct-
te
mpe
ra-
PH
ance
tu
re
(sta
ndar
d (U
S/cm
) (°
C)
unit
s)
Nitr
ite
plus
ni
trat
e as
ni
trog
en
(mg/
L)
Ort
ho-
Am
mo-
ph
osph
ate
Nitr
ite a
s ni
um a
s as
pho
s-
Silic
a as
ni
trog
en
nitr
ogen
ph
orus
Si
O2
(mg/
L)
(mg/
L)
(mg/
L)
(mg/
L)
Mis
sour
i C
ontin
ued
46
Smith
ville
Lak
e 05
/05/
9207
/07/
92
08/2
6/92
10/2
1/92
01/0
6/93
03/2
5/93
06/2
5/93
09/2
9/93
47
Stoc
kton
Lak
e 05
/06/
9207
/08/
9208
/25/
9210
7147
92
03/1
0/93
06/1
6/93
09/1
7/93
48
Bra
nche
d O
ak L
ake
05/0
7/92
07/0
1/92
09/1
1/92
10/2
7/92
01/0
6/93
0915
1400
0935
0930
1130
1245
1030
1000
1500
1615
1645
0800
1200
1400
0740
0915
0830
1200
0930
0930
268
274
252
256
205 _
244
242
268
237
251
268
277
273
269
444
391
409
413
400
14.0
26.0
23.0
14.0
- _ 18.0
17.0
15.5
28.0
27.0
19.5 8.0
26.0
22.0
Neb
rask
a
16.5
24.0
21.0
12.5 0
8.2
8.1
8.1
7.6
_ 6.4
7.5
8.1
8.2
7.7
8.1
7.8
8.0
7.7
8.5
8.5
8.6
8.3
8.5
0.38
<.05
<.05 .1
1.2
7
.45
.68
.38
.34
<.05
<.05
<.05 .4
0
.22
<.05
<.05
<.05
<.05
<.05
<.05
0.02
0.
07
<.01
.0
7<.
01
.04
.02
.04
.01
.04
.04
.05
<.01
.1
6<.
01
.10
<.01
.0
4<.
01
.02
<.01
<.
01
<.01
.0
6<.
01
<.01
<.01
.0
3<.
01
.05
<.01
.0
3<.
01
.04
<.01
.0
3<.
01
.02
.02
.02
0.01
1.
1<.
01
.6
.02
1.6
<.01
.5
<.01
.5
<.01
3.
0.0
2 2.
9.0
4 3.
8
<.01
.6
<.01
.4
.01
1.9
<.01
2.
7<.
01 .04
1.5
<.01
<.01
.3
.01
1.2
<.01
1.
3.0
2 1.
6<.
01
2.4
Tabl
e 8.
P
hysi
cal p
rope
rties
and
ana
lytic
al r
esul
ts fo
r nu
trien
ts c
olle
cted
from
76
rese
rvoi
rs in
the
Mid
wes
tern
Uni
ted
Sta
tes,
Apr
il 19
92 th
roug
h S
epte
mbe
r 19
93 -
Con
tinue
d
Dat
e of
co
llect
ion
Map
no.
(m
onth
/day
/ (fi
g. 1
) R
eser
voir
nam
e ye
ar)
Col
lec
tio
n tim
e (2
4-
hour
)
Spec
ific
W
ater
co
nduc
t-
tem
pera
- an
ce
ture
G
iS/c
m)
(°C
)
pH
(sta
ndar
d un
its)
Nitr
ite
plus
ni
trate
as
nitro
gen
(mg/
L)
Orth
o-
Am
mo-
ph
osph
ate
Nitr
ite a
s ni
um a
s as
pho
s-
nitr
ogen
ni
troge
n ph
orus
(m
g/L)
(m
g/L)
(m
g/L)
Silic
a as
Si
02
(mg/
L)N
ebra
ska C
ontin
ued
I co 8 1 a 5" (o fit a o> I 8 to c I 1 5" i 2.
| 3-
«
48
Bra
nche
d O
ak L
ak
e
03/2
3/93
Con
tinue
d 07
/13/
9309
/14/
93
49
Cal
amus
Res
ervo
ir
05/0
8/92
07/0
9/92
08/2
7/92
10/2
2/92
12/1
6/92
03/2
4/93
08/0
4/93
09/1
7/93
50
Cun
ning
ham
Lak
e 05
/06/
9206
/30/
9208
/27/
9210
/26/
9201
/04/
93
03/2
4/93
07/1
2/93
09/1
3/93
0945
0945
0825
1530
0930
1230
0900
1303
0930
0935
1400
0930
0930
1130
0915
1130
1345
1700
1345
365
417
369
167
148
140
168
145
174
143
134
479
389
405
406
483
455
428
398
4.0
25.0
17.5
13.0
19.5
21.0
11.0 2.0
5.0
22.5
17.5
17.0
25.0
22.0
11.0 0 4.0
25.5
20.0
8.6
8.4
8.3
7.7
8.3
9.1
8.0
8.3
7.8
8.8
8.4
8.4
8.5
8.5
8.3
8.4
7.4
8.4
8.5
0.08 .0
6.6
3
.10
.07
.05
.14
.19
.55
<.05 .0
6
.87
.06
<.05
<.05 .2
2
.85
.73
.55
0.01
0.
13.0
2 .1
0.0
5 .0
8
<.01
.0
4<.
01
.17
<.01
.0
3<.
01
.01
<.01
.0
4
.01
.24
<.01
.0
3<.
01
<.01
.03
.05
.01
.05
<.01
.1
7<.
01
.02
.02
.03
.02
.15
.10
.23
.07
.11
0.03 .0
1.0
4
.06
.06
<.01 .0
2.0
3
.13
.02
.01
<.01
<.01
<.01 .0
1<.
01
<.01
<.01
<.01
4.7
1.0
1.3
29 11 27 13 16 43 6.6
<.l 2.2
<.l 2.2
2.7
41 5.4 .8 .2
Tabl
e 8.
P
hysi
cal p
rope
rties
and
ana
lytic
al r
esul
ts fo
r nu
trien
ts c
olle
cted
from
76
rese
rvoi
rs in
the
Mid
wes
tern
Uni
ted
Sta
tes,
Apr
il 19
92 th
roug
h^
.»
\JU
jJIX
il 1
Ik
TO
I 1
<7<
7vJ
WV
SI
IUI
IUC
U o
o
51 8 s*
g §
Map
no.
<§
2.
C'9-
1)
Res
ervo
ir n
ame
Dat
e of
co
llect
ion
(mon
th/d
ay/
year
)
Col
lec
tio
n tim
e (2
4-
hour
)
Spec
ific
Wat
er
cond
uct-
te
mpe
ra-
ance
tu
rePH
(s
tand
ard
units
)
Nitr
ite
plus
ni
trate
as
nitro
gen
(mg/
L)
Nitr
ite a
s ni
trog
en
(mg/
L)
Am
mo
ni
um a
s ni
trog
en
Orth
o-
phos
phat
e as
pho
s
phor
us
(mg/
L)
Silic
a as
Si
O2
(mg/
L)0>
«?
Neb
rask
a C
ontin
ued
"S §
, 51
E
nder
s R
eser
voir
o &
3 a
il <o 2
."I 5 IT cT E o § 1 g
52
Har
lan
Cou
nty
Lake
to a. z =f o 1 3 O J|
1 § 8 53
H
arry
Str
unk
Lak
e1 2 0
. i _
05/0
7/92
07/0
7/92
08/2
5/92
10/2
0/92
12/1
5/92
03/2
3/93
08/0
3/93
09/2
1/93
05/0
5/92
07/0
8/92
08/2
6/92
10/2
1/92
12/1
4/92
03/2
2/93
07/2
2/93
09/2
0/93
05/0
6/92
07/0
8/92
08/2
6/92
10/2
1/92
12/1
4/92
1045
1130
1500
1030
1500
1730
0700
1130
1415
1400
1700
1300
1130
1630
1325
1100
0930
1030
1200
1000
1530
409
382
405
363
402
390
370
328
818
677
632
630 --
642 --
505
501
388
366
374
394
15.0
22.5
17.0
12.5 1.5
8.5
22.5
18.0
22.0
23.0
223
13.5 1.0
6.0
-- 20.0
15.5
22.0
18.0
12.5 1.5
7.9
8.2
7.7
7.7
8.3
8.6
8.3
7.9
8.2
8.2
8.7
8.3
8.0
8.2
~ 8.0
8.1
8.2
8.4
7.9
8.4
0.17
<.05 .4
6.0
7.2
6
.49
.14
<.05
<.05 .0
9.2
2.1
9.2
8
.40
<.05 .3
5
<.05 .2
9<.
05 .24
.27
<0.0
1<.
01<.
01<.
01 .02
.01
.02
<.01
<.01 .0
2<.
QJ _
.03
.02
.01
<.01 .0
1
<.01 .0
1<.
01<.
01<.
01
0.04 .0
5.0
3.0
7.0
2
.04
.05
.03
.04
.17
----
- .0
6^
.04
.07
.23
.03
.03
.06
.03
.04
.04
.03
<0.0
1
<.01
<.01
<.01
<.01
<.01
<.01
<.01 .0
5-.-
05 .03
.03
.13
.06
.17
.04
.01
.01
.02
<.01
55 24 35 29 30 36 35 31 25 2.4
26.3 1.6
5.8
2.2
8.0
37 21 11 28 29
s I
Tabl
e 8.
Phy
sica
l pro
perti
es a
nd a
naly
tical
res
ults
for
nutri
ents
col
lect
ed fr
om 7
6 re
serv
oirs
in th
e M
idw
este
rn U
nite
d S
tate
s, A
pril
1992
thro
ugh
Sep
tem
ber
1993
Con
tinue
d
Map
no.
(f
ig. 1
) R
eser
voir
nam
e
53
Har
ry S
trun
k L
ake
3
Con
tinue
dCD 8 3
54
Hug
h B
utle
r L
ake
<D a. 8 fit a I 8 3) 8 » 3" z
S.
55
Paw
nee
Lak
e
f 5f I i 3 «O ar £ s
Dat
e of
co
llect
ion
(mon
th/d
ay/
year
)
03/2
2/93
08/0
3/93
09/2
0/93
05/0
6/92
07
/07/
92
08/2
6/92
10/1
9/92
12/1
5/92
03/2
3/93
08
/03/
9309
/21/
93
05/0
7/92
07/0
1/92
08/2
7/92
10/2
7/92
01/0
6/93
03/2
3/93
07/1
3/93
09/1
4/93
Col
lec
tio
n tim
e (2
4-
hour
)
1200
1700
1400
1400
16
00
1000
1400
0900
1430
18
0015
30
1040
0935
1400
1045
1040
1115
1045
0920
Spec
ific
co
nduc
t
ance
((
iS/c
m)
Wat
er
tem
pera
tu
repH
(s
tand
ard
units
)N
ebra
ska C
ontin
ued
390
4.5
8.2
328
306
566
470
439
560
531
540
422
417
437
389
406
402
394
394
401
329
22.0
20.0
15.0
24
.0
19.5 9.5
4.0
6.0
23.5
19.0
16.5
24.5
23.0
13.5 0 4.0
25.0
17.0
8.4
7.6
8.2
7.9
8.5
8.1
7.5
7.8
8.3
7.3
8.5
8.4
8.6
8.4
8.4
8.1
8.2
8.1
Nitr
ite
plus
ni
trat
e as
ni
trog
en
(mg/
L)
0.69 .2
2.7
7
.35
<.05
.2
4.3
1.0
9
.17
.08
.14
<.05
<.05
<.05
<.05 .0
5
<.05 .1
3.6
1
Ort
ho-
Am
mo-
ph
osph
ate
Nitr
ite a
s ni
um a
s as
pho
s-
nitr
ogen
ni
trog
en
phor
us
(mg/
L)
(mg/
L)
(mg/
L)
0.01
0.
10.0
1 .0
5<.
01
.04
.02
.09
<.01
.0
4 .0
2 .0
7.0
1 .0
3<.
01
.07
<.01
.1
0 <.
01
.07
<.01
.0
5
<.01
.0
3<.
01
.04
<.01
.0
2<.
01
.02
.02
.04
<.01
.0
3.0
2 .3
9.0
2 .0
5
0.08 .1
1.1
2
.06
.03
.03
.02
.03
.05
.03
<.01 .0
1<.
01<.
01<.
01 .02
.02
.05
Silic
a as
Si
O2
(mg/
L)
32 14 <.l
53
11
29 52 32 36
18 24
.9 2.4 .8 1.4
2.9
3.7
6.1
4.5
Tabl
e 8.
P
hysi
cal p
rope
rties
and
ana
lytic
al r
esul
ts fo
r nu
trien
ts c
olle
cted
from
76
rese
rvoi
rs in
the
Mid
wes
tern
Uni
ted
Sta
tes,
Apr
il 19
92 th
roug
h
Concentrations
of
!
April 1992
Throu
gh </> §
; §
. o ?i jo
~* 7 So a » X <D O
1
g_ 2 S D) o- O I 0) a z 1 a 5" 0 5 1 3 1 S
a. i 2. » 3 0 o s
Ut^
plC
sI
1 I1
_»S
7I
t&\J
\J
WW
I Il
ll l
UV
^U
Dat
e of
co
llect
ion
Map
no.
(m
onth
/day
/ (f
ig. 1
) R
eser
voir
nam
e ye
ar)
Col
lec
ti
on ti
me
(24-
ho
ur)
Spec
ific
W
ater
co
nduc
t-
tem
pera
- pn
an
ce
ture
(s
tand
ard
friS
/cm
) (°
C)
units
)
Nitr
ite
plus
ni
trat
e as
ni
trog
en
(mg/
L)
Nitr
ite a
s ni
trog
en
(mg/
L)
Am
mo
ni
um a
s ni
trog
en
(mg/
L)
Ort
ho-
phos
phat
e as
pho
s
phor
us
(mg/
L)
Silic
a as
Si
O2
(mg/
L)N
ebra
ska C
ontin
ued
56
Swan
son
Lak
e 05
/06/
9207
/07/
92
08/2
5/92
10/2
0/92
12/1
5/92
03/2
3/93
08/0
3/93
09/2
1/93
57
Will
ow C
reek
Res
ervo
ir
05/0
7/92
06/3
0/92
08/2
6/92
1072
6792
01/0
5/93
03/2
4/93
07/1
2/93
09/1
3/93
58
Pipe
stem
Res
ervo
ir
05/0
7/92
06/2
5/92
08/2
5/92
10/2
6/92
01/2
1/93
1630
1400
1800
0900
1230
1600
1000
0900
1315
1240
1120
1330
1130
1000
1300
1030
1500
1030
1130
1155
1020
771
630
722
595
659
508
639
572
247
252
244
502
459
249
347
399
700
710
740
725
865
23.5
23.0
24.0
11.0 1.0
7.0
23.5
19.5
17.5
23.0
20.0
f4TO 0 5.
023
.517
.0N
orth
Dak
ota
16.0
20.0
19.0 7.5 .5
8.5
8.5
8.5
8.1
8.9
8.8
8.4
8.0
8.5
8.4
8.4
7.8
7.9
7.1
8.2
8.3
8.0
8.5
8.3
8.7
7.6
0.29
<.05 .6
3<.
05 .11
.12
<.05 .0
6
.31
1.4
<.05
<.05 .2
6
.88
.14
.18
<.05
<.05 .0
7
<.05 .1
1
0.03
<.01 .0
4<.
01 .01
<.01
<.01
<.01 .0
2.0
8<.
01
<.01 .0
2
.11
.02
.01
<.01
<.01 .0
2<o
i.0
2
0.05 .1
2.0
9.0
5.0
1
.02
.02
.08
.14
.20
.16
.17
.13
.43
.07
.08
.05
.05
.30
.03
.91
<0.0
1<.
01<.
01<.
01<.
01
<.01
<.01
<.01
<.01 .0
2.0
1.1
4
.10
.18
.06
.09
.02
<.01 .0
4
.02
.33
27 17 18.3 3.2
6.4
4.3
4.2 .4 5.9
1.1
49 3.1
16 11 26
.3 .5 7.3
<.l 3.9
Tabl
e 8.
P
hysi
cal p
rope
rties
and
ana
lytic
al r
esul
ts fo
r nu
trien
ts c
olle
cted
from
76
rese
rvoi
rs in
the
Mid
wes
tern
Uni
ted
Sta
tes,
Apr
il 19
92 th
roug
h S
epte
mbe
r 19
93 C
ontin
ued
Dat
e of
co
llect
ion
Map
no.
(m
onth
/day
/ (fi
g. 1
) R
eser
voir
nam
e ye
ar)
Col
lec
ti
on ti
me
(24-
ho
ur)
Spe
cifi
c co
nduc
t
ance
(u
S/cm
)
Wat
er
tem
pera
tu
rePH
(s
tand
ard
units
)
Nitr
ite
plus
ni
trat
e as
ni
trog
en
(mg/
L)
Nitr
ite a
s ni
trog
en
(mg/
L)
Am
mo
ni
um a
s ni
trog
en
(mg/
L)
Orth
o-
phos
phat
e as
pho
s
phor
us
(mg/
L)
Silic
a as
Si
O2
(mg/
L)
Nor
th D
akot
a C
ontin
ued
TJ 2. s. 3 g. w D) Q.
I "5. 1' 3) c 1 z 5' Jf D
3.
1 3 <Qp
58
Pipe
stem
Res
erv
oir
05
/04/
93
Con
tinue
d 07
/13/
93
59
Alu
m C
reek
Lak
e 05
/05/
9207
/20/
9209
/08/
9211
/04/
9201
/20/
93
03/2
5/93
07/0
1/93
09/2
7/93
60
Dee
r C
reek
Lak
e 05
/04/
9207
/30/
9209
/09/
9210
/14/
9201
/12/
93
03/2
6/93
07/1
2/93
09/2
9/93
0815
0830
1430
1100
1340
0915
1530
1130
0945
1230
1230
1000
1000
1200
1345
1010
0930
1100
496
550
493
501
445
464
453
368
402
419
553
498
492
477
515
533
470
498
9.0
17.5
Ohi
o
13.5
24.0
23.5
12.0 1.5
3.5
20.0
15.0
15.5
23.5
22.5
16.5 3.0
6.0
25.5
17.0
8.3
8.2
7.4
7.7
7.6
8.2
8.4
8.1
7.6
7.1
8.7
7.9
7.9
7.8
8.1
7.6
7.5
7.8
0.11 .3
6
2.2
1.9
1.4
1.1
1.3
1.6
1.5 .1
9
7.1
4.5
2.1
1.4
5.7
4.7
3.6
1.1
0.01 .0
5
.01
.04
.04
.02
.02
.03
.02
.02
.05
.16
.09
.07
.03
.03
.13
.01
0.19 .2
7
.02
.04
.08
.05
.03
.03
.03
.49
.01
.15
.06
.02
.09
.04
.27
.02
0.23 .1
0
<.01
<.01 .0
1<o
i<.
01
<.01
<.01
<.01
<.01 .0
1<.
01<.
01 .07
<.01 .0
1
.02
6.9
13 1.3
2.0
3.7
4.2
3.9
4.0
1.2
3.8
3.3
7.3
2.5 .9 7.3
6.0
7.3
2.6
Tabl
e 8.
P
hysi
cal p
rope
rties
and
ana
lytic
al r
esul
ts fo
r nu
trien
ts c
olle
cted
from
76
rese
rvoi
rs in
the
Mid
wes
tern
Uni
ted
Sta
tes,
Apr
il 19
92 th
roug
h^ _
vjc
pid
I lu
c/i
i &
iy\j
\_
/ui
mi
iuc«u
TJ
0 0
S3
~
ro 5
1* |
Map
no.
ID
2.
(f'9
-1)
R
eser
voir
nam
e»V fy 2.
61
Del
awar
e La
keA
i 5. 3
-go
<*> 5
1 s i E
o § i | jf
62
Dill
on L
ake
0)
S 2 1 3_ 5"
O 3 1 3 8 63
H
oove
r R
eser
voir
2
5 i *m
Dat
e of
co
llect
ion
(mon
th/d
ay/
year
)
Col
lec
tio
n tim
e (2
4-
hour
)
Spec
ific
co
nduc
t
ance
(n
S/cm
)
Wat
er
tem
pera
tu
rePH
(s
tand
ard
units
)
Nitr
ite
plus
ni
trat
e as
ni
trog
en
(mg/
L)
Nitr
ite a
s ni
trog
en
(mg/
L)
Ort
ho-
Am
mo-
ph
osph
ate
nium
as
as p
hos-
ni
trog
en
phor
us
(mg/
L)
(mg/
L)
Silic
a as
Si
O2
(mg/
L)O
hio C
ontin
ued
05/0
5/92
06/3
0/92
08/1
2/92
10/0
7/92
12/3
0/92
03/2
4/93
07/0
6/93
09/2
7/93
04/3
0/92
07/0
7/92
09/1
0/92
10/1
4/92
01/1
2/93
03/2
4/93
07/0
9/93
09/2
8/93
05/0
6/92
07/2
0/92
09/0
8/92
11/0
4/92
01/2
0/93
1230
1230
1200
1300
0920
1500
1130
1030
1115
1330
OQ
flft
\jy\
j\j
0900
0930
1000
1200
1400
1000
0900
1130
1100
1130
502
521
423
517
570
440
295
454
510
599
432
570
439
412
390
593
484
500
432
410
405
14.0
21.5
21.5
17.5 1.5
5.5
22.5
18.0
14.0
23.5
2L5
15.0 4.0
7.5
27.0
18.5
12.0
19.5
21.5
12.0 1.0
7.5
7.3
7.9
7.9
8.1
8.7
7.4
8.0
7.2
7.6
OJl
8.6
8.2
8.6
7.9
7.8
8.8
7.9
7.4
8.1
8.7
7.1
3.3
1.7 .2
33.
0
3.3
5.9 .6
3
.73
.54
85
t*f
c*
.62
2.6
2.0
4.4 .4
3
3.2
2.2
1.3 .9
81.
4
0.07 .2
5.0
7.0
3.0
4
.04
.17
.03
<.01 .0
9.0
6.0
3.0
4
.04
.10
.05
.02
.05
.08
.01
.03
0.13 .5
0.1
3.0
6.1
2
.14
.28
.07
.02
.27 21
-
~»»~
±
.07
.10
.07
.19
.34
.02
.08
.16
.03
.03
0.04 .0
1.0
1<.
01 .03
<.01 .0
6.0
2
<.01
<.01 05
- V
i^
.02
.04
<.01
<.01 .0
3
<.01 .0
1<.
01<.
01 .01
8.1
~ 9.7 .5 7.1
5.7
5.5
2.5
2.8
2.7
64
\y»
^r
4.4
7.5
6.0
4.4
6.7
<.l
1.6
4.5
3.5
3.7
Tabl
e 8.
P
hysi
cal p
rope
rties
and
ana
lytic
al r
esul
ts fo
r nu
trien
ts c
olle
cted
from
76
rese
rvoi
rs in
the
Mid
wes
tern
Uni
ted
Sta
tes,
Apr
il 19
92 th
roug
h S
epte
mbe
r 19
93 C
ontin
ued
Dat
e of
co
llect
ion
Map
no.
(m
onth
/day
/ (fi
g. 1
) R
eser
voir
nam
e ye
ar)
Col
lec
tio
n tim
e (2
4-
hour
)
Spec
ific
W
ater
co
nduc
t-
tem
pera
- an
ce
ture
(u
S/cm
) (°
C)
pH
(sta
ndar
d un
its)
Nitr
ite
plus
ni
trat
e as
ni
trog
en
(mg/
L)
Nitr
ite a
s ni
trog
en
(mg/
L)
Ort
ho-
Am
mo-
ph
osph
ate
nium
as
as p
hos-
ni
trog
en
phor
us
(mg/
L)
(mg/
L)
Silic
a as
Si
O2
(mg/
L)O
hio
Con
tinue
d ,
ar CD fit 3 * <D CD
fit Q. i o" St DO <D
CD c CD 1 § 9 1 i =? 3 (Q 1
63
Hoo
ver R
eser
voir
03/2
5/93
Con
tinue
d 07
/01/
9309
/24/
93
64
Milt
on R
eser
voir
05
/11/
9207
/07/
9208
/17/
9210
/21/
9201
/13/
93
04/2
0/93
07/2
0/93
09/2
1/93
65
O'S
haug
hnes
sy R
eser
voir
05
/05/
9206
/30/
9208
/12/
9210
/07/
9212
/30/
92
03/2
2/93
06/2
9/93
09/2
8/93
1000
1130
1030
1100
0900
1120
1100
1145
1045
1100
0800
0845
1000
0930
1100
1155
1015
1500
1000
314
344
333
604
621
510
443
404
399
388
407
724
606
547
771
720
581
558
713
3.0
17.0
20.0
14.5
19.5
22.0
11.5 2.0
11.5
22.5
19.0
11.5
20.5
20.5
14.0 3.0
3.0
23.5
14.0
8.2
7.8
7.7
6.9
6.8
8.4
8.2
8.3
8.0
7.0
7.4
7.7
7.4
8.7
8.2
7.4
8.6
8.1
7.4
2.0
1.3 .7
8
.75
.71
1.1 .5
61.
0
1.2 .17
.08
9.8
11 2.2 .8
74.
0
4.3
5.2 .7
3
0.03 .0
2.0
4
.01
.09
.08
.05
.02
.02
.03
.02
.06
.09
<.01 .0
1.0
6
.04
.09
<.01
0.05 .0
4.1
1
.10
.37
.08
.09
.03
.04
.66
.13
.03
.05
.03
.02
.10
.10
.12
.04
0.01
<.01 .0
2
<.01
<.01
<.01
<.01
<.01
< 01
<.01 .0
1
.04
.02
.08
.02
.08
.04
.01
.05
4.9
2.5
3.3 .5 1.8
2.9
2.8
3.4
2.1
4.0
2.1
7.4
5.4
7.6 .9 7.4
6.5
4.4
4.3
Tabl
e 8.
P
hysi
cal p
rope
rties
and
ana
lytic
al r
esul
ts fo
r nu
trien
ts c
olle
cted
fro
m 7
6 re
serv
oirs
in th
e M
idw
este
rn U
nite
d S
tate
s, A
pril
1992
thro
ugh
Concentrations
of
Se
April 1992
Throu
gh S $8
II
II
<o S
.b>
Q
.
« z 2
o Q.
<D S 1 5T JO o> Q. i ? 1 5" O c o 3 3 8 Q. S Q. i | 9 i
VJC
|^L
WI
1 IL
St^
l 1
\J\J
\J
VS
V/I
Ill
l IU
OV
J
Dat
e of
C
olle
c-
Spe
cifi
c W
ater
co
llec
tion
ti
onti
me
cond
uct-
te
mpe
ra-
pn
Map
no.
(m
onth
/day
/ (2
4-
ance
tu
re
(sta
ndar
d (f
ig. 1
) R
eser
voir
nam
e ye
ar)
hour
) (p
.S/c
m)
(°C
) un
its)
66
Sand
Lak
e 05
/06/
9206
/24/
92
08/3
1/92
10/1
4/92
01/2
2/93
03/2
4/93
07/0
1/93
09/0
8/93
67
Chi
ppew
a Fl
owag
e 05
/06/
9207
/15/
9208
/18/
9210
/20/
92
01/0
6/93
04/2
0/93
07/1
3/93
09/0
7/93
68
Dai
ryla
nd R
eser
voir
05
/06/
9207
/14/
92
08/1
9/92
10/2
0/92
01/0
6/93
1245
1030
1030
0930
1500
1015
0800
0830
1350
1210
1415
1430
1320
1615
1320
1430
0900
1245
0915
1700
1550
1,33
0
1,32
0
1,38
01,
440
2,00
0
1,92
0
830
680 70 114
I34 11
413
1 99 88 129 95 97 106 87 113
Sout
h D
akot
a
15.5
22.0
16.0 5.0 .5 2.0
19.5
16.5
Wis
cons
in
12.5
21.5
2L5
9.0
1.0
5.5
21.5
20.5
11.0
20.0
20.5 8.5
1.0
8.3
8.4
8.6
8.5
7.6
8.3
8.2
8.1
7.6
7.7
8,0
7.7
7.2
7.9
7.3
7.9
7.0
7.1
7.2
7.9
7.3
Nitr
ite
plus
ni
trat
e as
ni
trog
en
(mg/
L)
<0.0
5<.
05
<.05 .1
0<.
05
<.05
<.05
<.05 .1
4
.29
.49
.41
.89
.55
.38
.64
.09
.09
<.05 .1
0
.20
Nitr
ite a
s ni
trog
en
(mg/
L)
<0.0
1<.
01
<.01 .0
2.0
2
<.01 .0
1<.
01
<.01 .0
1JQ
Z ._
_-.
.02
.02
.01
.01
.02
<.01
<.01
<.01
<.01 .0
3
Ort
ho-
Am
mo-
ph
osph
ate
nium
as
as p
hos-
ni
trog
en
phor
us
(mg/
L)
(mg/
L)
0.02 .0
2.0
3.2
8.4
3
.14
.11
.04
.04
.36
,60
.11
.45
.29
.24
.38
.04
.05
.03
.09
.07
0.09 .1
3.1
4.0
9.1
9
.17
.12
.32
<.01 .0
4
.0$
.04
.09
.07
.04
.07
<.01 .0
1<.
01 .01
.01
Silic
a as
S
i02
(mg/
L)
19 21 35 31 40 18 17 33 5.9
6.7
6.9
9.6
12 8.7
7.6
9.2
6.5
5.9
5.7
9.5
11
Tabl
e 8.
P
hysi
cal p
rope
rtie
s an
d an
alyt
ical
res
ults
for
nutr
ient
s co
llect
ed f
rom
76
rese
rvoi
rs in
the
Mid
wes
tern
Uni
ted
Sta
tes,
Apr
il 19
92 th
roug
h S
epte
mbe
r 1
99
3 C
on
tinu
ed
Dat
e of
co
llect
ion
Map
no.
(m
onth
/day
/ (f
ig. 1
) R
eser
voir
nam
e ye
ar)
Col
lec
tio
n tim
e (2
4-
hour
)
Spec
ific
W
ater
co
nduc
t-
tem
pera
- an
ce
ture
PH
(sta
ndar
d un
its)
Nitr
ite
plus
ni
trat
e as
ni
trog
en
(mg/
L)
Nitr
ite a
s ni
trog
en
(mg/
L)
Am
mo
ni
um a
s ni
trog
en
(mg/
L)
Ort
ho-
phos
phat
e as
pho
s
phor
us
(mg/
L)
Silic
a as
Si
O2
(mg/
L)W
isco
nsin
C
ontin
ued
3 i Tl
1 3 <D to a. 8L I 30 » C Sf o" z c 1 S | (O s 3 c (O (O
<D S 3 a* <D
68
Dai
ry la
nd R
eser
voir
04
/21/
93C
ontin
ued
07/1
3/93
09/0
8/93
69
Lake
Men
dota
05
/08/
9207
/21/
9208
/21/
9210
/23/
9201
/05/
93
04/1
9/93
07/1
2/93
09/0
1/93
70
Lake
Men
omin
05
/06/
9207
/15/
9208
/18/
9210
/20/
9201
/06/
93
04/2
0/93
07/1
3/93
09/0
7/93
0800
1700
0655
1130
1130
0920
1050
1130
1200
1130
1145
0900
0815
1050
1040
0950
1215
1110
1220
73 78 118
450
408
416
423
443
455
421
408
171
218
232
215
244
165
188
229
4.0
21.5
20.0
12.5
23.5
22.5
13.5 1.0
5.5
24.0
24.0
14.0
22.5
21.5 7.5
1.0
7.0
21.5
20.0
6.7
8.2
7.0
8.6
8.5
8.5
8.6
8.3
8.3
8.8
8.9
7.4
7.2
7.8
8.8
7.2
7.4
7.3
7.8
0.13 .0
8<.
05 .31
<.05
<.05
<.05 .1
6
.45
.12
<.05 .7
5.7
2.4
5.4
22.
0
1.0 .7
3.5
4
<0.0
1<.
01<.
01 .02
<.01
<.01
<.01 .0
2
.02
.03
<.01 .0
1.0
3.0
2.0
1.0
3
.01
.01
.01
0.05 .0
7.0
6
.06
.05
.03
.17
.46
.38
.03
.02
.02
.15
.04
.02
.07
.03
.06
.03
<0.0
1 .01
.01
.05
<.01
<.01 .0
7.0
9
.11
.03
.02
.01
.06
.02
<.01 .0
4
.04
.05
.04
8.3
6.2
6.4 .3 .4 1.0
<.l .8 1.5
1.3
2.7
9.2
12 12 9.6
16 11 10 13
10 CO
Tabl
e 8.
Phy
sica
l pro
perti
es a
nd a
naly
tical
res
ults
for
nutri
ents
col
lect
ed fr
om 7
6 re
serv
oirs
in th
e M
idw
este
rn U
nite
d S
tate
s, A
pril
1992
thro
ugh
Concentrations
of
SeU
April 1992
Throu
gh Se IP a If Ii * x i 8- I I 0 z 1 1 y o i i 1 1 z i 1
\_>
t7^>
ld 1
IU
d
1 v
7v
7v
j W
l/l
UN
IU
C7
VJ
Dat
e of
co
llect
ion
Map
no.
(m
onth
/day
/ (fi
g. 1
) R
eser
voir
nam
e ye
ar)
Col
lec
tio
n tim
e (2
4-
hour
)
Spec
ific
cond
uct
ance
(li
S/cm
)
Wat
er
tem
pera
tu
rePH
(s
tand
ard
units
)
Nitr
ite
plus
ni
trat
e as
ni
trog
en
(mg/
L)
Nitr
ite a
s ni
trog
en
(mg/
L)
Am
mo
ni
um a
s ni
trog
en
(mg/
L)
Orth
o-
phos
phat
e as
pho
s
phor
us
(mg/
L)
Silic
a as
Si
O2
(mg/
L)W
isco
nsin
C
ontin
ued
71
Lake
Mon
ona
05/0
8/92
07/2
1/92
08/2
1/92
10/2
3/92
01/0
5/93
04/1
9/93
07/1
2/93
09/0
1/93
72
Lake
Wau
besa
05
/08/
9207
/21/
9208
/21/
9210
/23/
9201
/05/
93
04/1
9/93
07/1
2/93
09/0
1/93
73
Lake
Wau
sau
05/0
7/92
07/1
6/92
08/2
0/92
10/2
1/92
01/0
7/93
0950
1015
0815
0945
1030
1115
1015
1025
1050
1100
0850
1015
1100
1140
1030
1050
0930
1130
0850
1300
1330
479
455
453
460
477
493
448
419
503
465
482
475
501
476
453
440
105
142
174
125
133
14.0
23.5
22.0
12.5 1.0
7.0
23.0
24.0
15.0
23.5
22.0
11.5 2.0
5.5
24.5
24.5
12.5
22.0
21.5 5.5 .5
8.6
8.5
8.9
7.6
8.0
7.5
8.1
7.9
8.7
8.4
8.6
8:4
8.3
8.5
8.6
8.6
7.0
7.6
7.6
8.0
7.2
0.05
<.05
<.05
<.05 .1
5
.32
<05
<.05 .1
9<.
05
<.05 .0
8.4
6
.47
<.05
<.05 .2
3.2
5<.
05 .35
.54
0.01 .01 .01 .0
2
.02
<.01
<.01 .0
2.0
1<.
01 <.ol .03
.02
<.01
<.01 .0
1<.
01<.
01<.
01 .03
0.04 .0
5
.02
.24
.46
.08
.05
.03
.07
.04
.02
.22
.26
.15
.03
.06
.06
.03
.02
.08
.11
<0.0
1<.
01<.
01 .04
.07
<.01 .0
2<.
01
<.01
<.01
<.01 .0
1 .03
<.01 .0
3<.
01
<.01 .0
2<.
01 .02
.03
0.3
1.2
1.2 .4 .5 .7 1.9
2.9 .2 3.0
3.2
2.8 .3 2.5
5.6
6.1
6.5
5.1
1.7
10 13
Tabl
e 8.
P
hysi
cal p
rope
rties
and
ana
lytic
al r
esul
ts fo
r nu
trien
ts c
olle
cted
from
76
rese
rvoi
rs in
the
Mid
wes
tern
Uni
ted
Sta
tes,
Apr
il 19
92 th
roug
h S
epte
mbe
r 19
93 -
Con
tinue
d
Map
no.
(fi
g. 1
) R
eser
voir
nam
e
Dat
e of
co
llect
ion
(mon
th/d
ay/
year
)
Col
lec
tio
n tim
e (2
4-
hour
)
Spec
ific
co
nduc
t
ance
(n
S/cm
)
Wat
er
tem
pera
tu
rePH
(s
tand
ard
unit
s)
Nitr
ite
plus
ni
trate
as
nitr
ogen
(m
g/L)
Nitr
ite a
s ni
trog
en
(mg/
L)
Am
mo
ni
um a
s ni
trog
en
(mg/
L)
Orth
o-
phos
phat
e as
pho
s
phor
us
(mg/
L)
Silic
a as
Si
O2
(mg/
L)W
isco
nsin
C
ontin
ued
o CD I o 5 S D> o. D> I O SL 3) o CD c CD ^ z I" s? | i | (O CO o a
73
Lak
e W
ausa
u C
ontin
ued
74
Lak
e W
isso
ta (
5548
)
75
Lak
e 77
46
04/2
1/93
07/1
4/93
09/0
8/93
05/0
5/92
07/1
4/92
08/1
9/92
10/2
1/92
01/0
7/93
04/2
1/93
07/1
4/93
09/0
7/93
05/0
7/92
07/1
6/92
08/2
0/92
10/2
2/92
01/0
8/93
04/2
0/93
07/1
3/93
09/0
7/93
1340
1215
1045
1550
1430
1050
0915
0850
1010
0850
1720
1415
1400
1120
1230
1230
0845
0745
0915
81 112
136 49 66 78 72 82 53 61 86 154
169
189
200
248
133
112
178
5.0
22.0
18.0
12.5
21.5
21.5 6.5
1.0
5.0
21.5
19.5
14.5
23.5
22.5 9.0 .5
4.0
23.5
20.0
8.4
8.0
7.7
6.5
7.2
7.3
8.0
7.4
7.2
7.7
7.4
7.6
7.9
7.7
7.7
7.5
8.2
8.0
7.6
0.40 .2
7.0
7
.07
<.05
<.05
<.05 .1
5
.07
.08
<.05 .4
3
.05
.13
.46
.94
.60
.45
.25
0.01
<.01
<.01
<.01
<.01
<.01
<.01 .0
3
< .0
1
< .0
1<.
01 .01
<.01 .0
1
.02
.02
.01
.02
.01
0.06 .0
6
.03
.06
.06
<.01 .0
7.0
7
.06
.05
.03
.05
.03
.17
.11
.15
.11
.08
.03
0.02 .0
2.0
1
<.01
<.01
<.01
<.01 .0
1
<.01
<.01
<.01
<.01 <oi
<.01 .0
2.0
4
.03
.05
<.01
6.7
7.4
4.8
6.7
6.2
5.8
4.9
11 8.2
6.9
6.1
3.0
3.9
4.3
2.6
9.4
7.5
4.7
1.1
10 at
Tabl
e 8.
P
hysi
cal p
rope
rties
and
ana
lytic
al r
esul
ts fo
r nu
trien
ts c
olle
cted
from
76
rese
rvoi
rs in
the
Mid
wes
tern
Uni
ted
Sta
tes,
Apr
il 19
92 th
roug
h S
epte
mbe
r 19
93-<
)ont
inue
d
= 5 _l Q)
(P 3
35
Sf
hi 5
H fl 18 *l 3 &
if 8" U
Q. * <D cT §- 1 f"~ . 0> 3 Q.
1 0 g 3 0
Dat
e of
colle
ctio
nM
ap n
o.
(mon
th/d
ay/
(fig.
1)
Res
ervo
ir n
ame
year
)
Col
lec
tion
time
(24-
hour
)
Spec
ific
cond
uct
ance
(liS/
cm)
Wat
erte
mpe
ra-
pntu
re(°
C)(s
tand
ard
units
)
Nitr
itepl
usni
trate
as
nitro
gen
(mg/
L)
Nitr
ite a
sni
trog
en(m
g/L)
Am
mo
nium
as
nitr
ogen
(mg/
L)
Orth
o-ph
osph
ate
as p
hos
phor
us(m
g/L)
Silic
a as
Si0
2(m
g/L)
Wis
cons
in C
ontin
ued
76
Spri
ng V
alle
y L
ake
05/0
6/92
07/1
5/92
08/1
8/92
10/2
0/92
01/0
6/93
04/2
0/93
07/1
3/93
09/0
7/93
--- -
- -
1050
1010
1220
1220
1115
1415
1215
1320
- -
-----
275
241
281
342
400
234
281
318
14.0
21.5
21.5 7.5
1.0
6.0
20.5
19.5
8.5
8.4
8.7
8.5
7.7
7.9
8.1
8.2
0.64 .7
4.0
6.6
31.
8 .72
.49
.25
0.02 .0
3.0
2.0
2.0
3
.01
.03
.02
0.02 .0
4<.
01 .07
.10
.05
.05
.06
<0.0
1 .07
<.01
<.01 .0
1
.03
.01
<.01
4.6
4.1
4.8
6.3
11 7.1
2.6
8.0
I s I
Tabl
e 9.
P
hysi
cal p
rope
rties
and
ana
lytic
al r
esul
ts fo
r nu
trien
ts c
olle
cted
from
top
and
bot
tom
of
17 r
eser
voirs
in t
he M
idw
este
rn U
nite
d S
tate
s, A
pril
1992
thro
ugh
Sep
tem
ber
1993
[jiS
/cm
, mic
rosi
emen
s pe
r cen
timet
er a
t 25
degr
ees
Cel
sius
; °C
, deg
ree
Cel
sius
; m
g/L,
mill
igra
ms
per l
iter;
<, le
ss th
an; , n
o da
ta]
z i (D 1
CO 1 | Tl 1 0> 3 Q.
03 o 3 a 30 (D $ O.
"^ o to
to 10 ! (0 »* I (D to 8
Map
no
. (f
ig. 1
) R
eser
voir
nam
e
1 C
arly
le L
ake
4 L
ake
Dec
atur
5 L
ake
Shel
byvi
lle
6 L
ake
Ver
mill
ion
8 R
end
Lak
e
1 5
Mis
siss
inew
a L
ake
19
Sala
mon
ie L
ake
23
Rat
hbun
Lak
e
30
Pom
ona
Lak
e
Dat
e of
co
llect
ion
(mon
th/
day/
year
)
08/2
5/92
08/2
5/92
09/0
1/92
09/0
1/92
08/2
5/92
08/2
5/92
08/2
8/92
08/2
8/92
08/2
4/92
08/2
4/92
08/1
7/92
08/1
7/92
08/1
8/92
08/1
8/92
08/1
2/92
08/1
2/92
08/2
7/92
OS/
27/9
2
Sam
pl
e ty
pe top
botto
m
top
botto
m
top
botto
m
top
botto
m
top
botto
m
top
botto
m
top
botto
m
top
botto
m
top
botto
m
Dep
th
of
sam
ple
(fee
t)
0.5
7 1 15
.520 2 19
.510
.570
.560
.544
136
Spec
ific
Wat
er
cond
uct-
te
mpe
r
ance
at
ure
484
500
527
528
478
547
523
568
403
408
319
359
416
370
253
262
327
328
Illin
ois
25.5
24.0
23.0
22.5
25.0
17.5
24.0
23.0
25.5
23.5
Indi
ana
24.0
21.5
21.0
24.0
Iow
a
25.0
22.0
Kan
sas
23.5
23.5
PH
(sta
nd
ard
units
)
8.1
7.4
8.0
7.9
7.5
6.9
7.9
7.2
8.3
7.3
8.4
7.0
7.4
9.1
8.8
7.4
6.3
7.8
Am
m
oniu
m
(mg/
L)
0.06 .2
4
.11
.11
.02
1.4 .0
4.0
6
.02
.19
.03
.10
.26
.03
.07
.02
.01
.02
Nitr
ite
plus
D
is-
nitr
ate
solv
ed
as
oxyg
en
nitr
ogen
(m
g/L)
(m
g/L)
8.0
2.2
6.5
5.8
4.3 .2
0
6.0 .5
0
10.5 2.4
9.2 .4
0
.40
12.5 8.8 .1
0
-
0.05 .0
5
3.7
3.7
2.9 .7
8
5.0
4.6 .0
5.0
5
1.5
1.5
3.2
3.9 .3
6.2
4
.25
.25
Nitr
ite
(mg/
L)
0.01 .0
2
.06
.06
.22
.04
.10
.13
.01
.02
.04
.05
.11
.10
.02
.02
<.01
<.01
Orth
o-
phos
ph
ate
(mg/
L)
0.16 .2
0
.07
.07
.01
.02
.01
.01
.02
.05
.03
.05
.03
.02
<.01
<.01
<.01
<.01
Silic
a (m
g/L)
1.6
3.3
10 10 1.3
3.3
8.4
8.6
2.7
3.7
2.4
3.9
3.9
1.7
1.8 .4 2.5
2.7
Tabl
e 9.
P
hysi
cal p
rope
rties
and
ana
lytic
al r
esul
ts fo
r nu
trien
ts c
olle
cted
from
top
and
botto
m o
f 17
res
ervo
irs in
the
Mid
wes
tern
Uni
ted
Sta
tes,
Apr
il
s VI 1 1 3 1 3 0 o 3>
O
O
O 51 <O 3
<O fl
110
3 1
f §
0
«to
o
w£
o <?
{? s
Ȥ
&If ii "f <D 3* o a <D 1 to cr
o I D> a 4<D 1 3 O 1 3 3 5* S & 2 1 « ff 3 <D O
2
1 v/v
/£-
11 1
Map
no.
(tig.
1)
34 36 40 48 57 59 62 69
WU
VJI
1 V
_H
^JJ
IV^I
1 IM
&I
1 v»
%<
Res
ervo
ir n
ame
Cro
ss L
ake
Lac
Qui
Par
leR
eser
voir
Win
nibi
gosh
ish
Res
ervo
ir
Bra
nche
d O
ak L
ake
Will
ow C
reek
Res
ervo
ir
Alu
m C
reek
Lak
e
Dill
on L
ake
Lak
e M
endo
ta
"J
WV
H I
UI
IUC
Dat
e of
colle
ctio
n(m
onth
/da
y/ye
ar)
08/1
9/92
08/1
9/92
08/2
0/92
08/2
0/92
08/1
7/92
08/1
7/92
09/1
1/92
09/1
1/92
08/2
6/92
08/2
6/92
08/0
6/92
08/0
6/92
09/1
5/92
09/1
5/92
07/2
3/92
07/2
3/92
i\J
Sam
pl
ety
pe
top
botto
m
top
botto
m
top
botto
m
top
botto
m
tori
botto
m
top
botto
m
top
botto
m
top
botto
m
Dep
thof
sam
ple
(feet
)
1.5
25
1.5
11 3 55
125 1 19 3.
336 3.
330 1.
551
Spec
ific
cond
uct
ance
(uS/
cm)
247
308
864
868
281
282
407
409
244
243
454
458
468
570
425
477
Wat
erte
mpe
rat
ure
(°C)
Min
neso
ta
21.0
18.0
21.5
21.5
20.0
20.0
Neb
rask
a
21.0
21.0
20.0
19.0
Ohi
o
24.0
20.0
22.5
21.5
Wis
cons
in
20.5
10.0
PH(s
tand
ar
dun
its)
8.2
7.4
8.1
8.1
8.2
8.2
8.5
8.4
8.4
8.4
8.4
8.1
8.1
7.8
8.6
7.6
Am
m
oniu
m(m
g/L)
0.04 .7
3
.43
.41
<.01 .0
2
.04
.06
,18
.18
.02
.06
.26
.60
.08
.83
Dis
so
lved
oxyg
en(m
g/L) -- ~ ~ ~ ~ ~ 7.2
6.8
&5
6.1
8.4 .4
0
5.4
1.4
7.6 .2
0
Nitr
ite
plus
nitr
ate
Orth
o-as
ph
os-
nitr
ogen
N
itrite
ph
ate
(mg/
L)
(mg/
L)
(mg/
L)
<0.0
5 <0
.01
<0.0
1<.
05
<.01
<.
01
.08
.01
.12
.08
.01
.12
<.05
<.
01
<.01
<.05
<.
01
<.01
<.05
<.
01
<.01
<.05
<.
01
<.01
<J)5
<Q
1 <.
01<.
05
<.01
.0
1
2.0
.05
<.01
1.9
.05
<.01
.53
.03
.02
.40
.03
.04
<.05
<.
01
<.01
.14
.04
.29
Silic
a(m
g/L)
7.1
9.2
29 29 7.3
7.9
1.2
1.2
13 1.1
3.4
4.3
5.3
5.6
1.1
2.5
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