Selected high use herbicides (bentazon, butylate, 2,4-D, and pendimethalin) in surface water

DESCRIPTION OF CONTENTS OF FILE SW1PEST3.DAT


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| DATA FILE FORMAT |
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columns  1-15  Station ID number
columns 21-26  Date (YYMMDD format)
columns 31-34  Time
columns 41-49  Streamflow (Storet code 00061, cubic feet per second)
column  51     Remark for dissolved butylate
columns 52-59  Dissolved butylate (Storet code 04028, in micrograms per liter)
column  61     Remark for dissolved bentazon
columns 62-69  Dissolved bentazon (Storet code 38711, in micrograms per liter)
column  71     Remark for dissolved 2,4-D
columns 72-79  Dissolved 2,4-D (Storet code 39732, in micrograms per liter)
column  81     Remark for dissolved pendimethalin
columns 82-89  Dissolved pendimethalin (Storet code 82683, in micrograms per liter)


NOTES: A < symbol in the remarks field indicates the pesticide was not
       detected in the sample.


       An E in the remarks field indicates the concentration given is
       estimated.  (An E remark associated with a low concentration typically
       indicates the pesticide was positively identified by spectral
       characteristics and retention time but that the concentration is
       less than the method detection limit.  An E remark associated with a
       high concentration typically indicates the reported concentration
       exceeded the range of the calibration standards and was estimated by
       extrapolation.)


       Streamflows or concentrations less than zero (for example -999.999)
       indicate no data are available for that observation.




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| STATION INFORMATION |
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Data are available for 11 stations.  Data were collected between May 1991
and September 1999 (periods of record and sampling frequency vary).  Land use
information is from Mitchell and other (1977) as revised by Hitt (1994).


Station ID number: 03353637
Station name:      LITTLE BUCK CREEK NEAR INDIANAPOLIS, IN
Latitude: 394000   Longitude: 0861148   Drainage area: 17.0 square miles
Land use: Agriculture = 42%  Forest = <1%  Urban = 57%  Other = <1%
NOTES: Site is 2.2 river miles upstream from confluence with White River
       and located in Marion County, Indiana.  Sample collected at South
       Belmont Street bridge.
Period of record for butylate and pendimethalin in this data file:  5/92 to 5/96
Period of record for bentazon and 2,4-D in this data file:          3/93 to 5/95


Station ID number: 03354000
Station name:      WHITE RIVER NEAR CENTERTON, IN
Latitude: 392951   Longitude: 0862402   Drainage area: 2,444 square miles
Land use: Agriculture = 78%  Forest = 3%  Urban = 18%  Other = 1%
NOTES: Site is 199 river miles upstream from confluence with Wabash River
       and located in Morgan County, Indiana.  Sample collected at Blue
       Bluff Road bridge.
Period of record for butylate and pendimethalin in this data file:  4/94 to 4/95
Period of record for bentazon and 2,4-D in this data file:          4/94 to 4/95


Station ID number: 03360895
Station name:      KESSINGER DITCH NEAR MONROE CITY, IN
Latitude: 383414   Longitude: 0871637   Drainage area: 56.2 square miles
Land use: Agriculture = 94%  Forest = 4%  Urban = <2%  Other = <1%
NOTES: Site is 1.7 river miles upstream from the confluence with White River
       and located in Knox County, Indiana.  Sample collected at County Road
       1000 East bridge.
Period of record for butylate and pendimethalin in this data file:  3/93 to 9/95
Period of record for bentazon and 2,4-D in this data file:          3/93 to 9/95


Station ID number: 03366500
Station name:      MUSCATATUCK RIVER NEAR DEPUTY, IN
Latitude: 384815   Longitude: 0854026   Drainage area: 293 square miles
Land use: Agriculture = 71%  Forest = 24%  Urban = 4%  Other = 1%
NOTES: Site is 50 river miles upstream from confluence with East Fork White
       River and located in Jefferson County, Indiana.   Sample collected at
       Dixinford Road bridge.
Period of record for butylate and pendimethalin in this data file:  4/94 to 4/95
Period of record for bentazon and 2,4-D in this data file:          4/94 to 4/95


Station ID number: 03373500
Station name:      EAST FORK WHITE RIVER AT SHOALS, IN
Latitude: 384002   Longitude: 0864731   Drainage area: 4,927 square miles
Land use: Agriculture = 69%  Forest = 25%  Urban = 5%  Other = 1%
NOTES: Site is 105 river miles upstream from confluence with White River
       and located in Martin County, Indiana.   Sample collected at U.S.
       Highway 50 bridge.
Period of record for butylate and pendimethalin in this data file:  4/94 to 4/95
Period of record for bentazon and 2,4-D in this data file:          4/94 to 4/95


Station ID number: 03373530
Station name:      LOST RIVER NEAR LEIPSIC, IN
Latitude: 383811   Longitude: 0862155   Drainage area: 34.8 square miles
Land use: Agriculture = 94%  Forest = 5%  Urban = <1%  Other = <1%
NOTES: Site is 76 river miles upstream from confluence with East Fork White
       River and located in Orange County, Indiana.  Sample collected at
       Potato Road bridge.
Period of record for butylate and pendimethalin in this data file:  4/94 to 4/95
Period of record for bentazon and 2,4-D in this data file:          4/94 to 4/95


Station ID number: 03374100
Station name:      WHITE RIVER AT HAZLETON, IN
Latitude: 382923   Longitude: 0873300   Drainage area: 11,305 square miles
Land use: Agriculture = 69%  Forest = 22%  Urban = 7%  Other = 2%
NOTES: Site is 18.6 river miles upstream from confluence with Wabash River
       and located in Knox County, Indiana.   Sample collected at old U.S.
       Highway 41 bridge.  Streamflow is from U.S. Geological Survey streamflow
       gaging station 03374000 located 27 river miles upstream (drainage area
       of gaging station is 11,125 square miles).
Period of record for butylate and pendimethalin in this data file:  5/91 to 9/96
Period of record for bentazon and 2,4-D in this data file:          3/93 to 9/95


Station ID number: 385234087071801
Station name:      WHITE RIVER AT HIGHWAY 58 NEAR ELNORA, IN
Latitude: 385234   Longitude: 0870718   Drainage area: 4,793 square miles
Land use: Agriculture = 71%  Forest = 19%  Urban = 8%  Other = 2%
NOTES: Site is 102 river miles upstream from confluence with Wabash River
       and located in Daviess County, Indiana.  Sample collected at State
       Road 58 bridge.  Streamflow is from U.S. Geological Survey streamflow
       gaging station 03360500 located 11.1 river miles upstream (drainage
       area of gaging station is 4,688 square miles).
Period of record for butylate and pendimethalin in this data file:  4/94 to 4/95
Period of record for bentazon and 2,4-D in this data file:          4/94 to 4/95


Station ID number: 391732085414401
Station name:      CLIFTY CREEK AT CO RD 1150 E NEAR HARTSVILLE, IN
Latitude: 391732   Longitude: 0854144   Drainage area: 87.9 square miles
Land use: Agriculture = 98%  Forest = 1%  Urban = <1%  Other = <1%
NOTES: Site is 21.9 river miles upstream from confluence with East Fork White
       River and located in Bartholomew County, Indiana.  Sample collected
       at County Road 1150 East bridge.  Streamflow is from U.S. Geological
       Survey streamflow gaging station 03364500 located 1.9 river miles
       downstream (drainage area of gaging station is 91.4 square miles).
Period of record for butylate and pendimethalin in this data file:  4/94 to 4/95
Period of record for bentazon and 2,4-D in this data file:          4/94 to 4/95


Station ID number: 393306086585201
Station name:      BIG WALNUT CREEK AT CO RD 700 W AT REELSVILLE, IN
Latitude: 393306   Longitude: 0865852   Drainage area: 318 square miles
Land use: Agriculture = 83%  Forest = 15%  Urban = 1%  Other = 1%
NOTES: Site is 5.7 river miles upstream from confluence with Eel River and
       located in Putnum County, Indiana.   Sample collected at County Road
       700 West bridge.  Streamflow is from U.S. Geological Survey streamflow
       gaging station 03357500 located 1.6 river miles downstream (drainage area
       of gaging station is 326 square miles).
Period of record for butylate and pendimethalin in this data file:  4/94 to 4/95
Period of record for bentazon and 2,4-D in this data file:          4/94 to 4/95


Station ID number: 394340085524601
Station name:      SUGAR CREEK AT CO RD 400 S AT NEW PALESTINE, IN
Latitude: 394340   Longitude: 0855246   Drainage area: 93.4 square miles
Land use: Agriculture = 95%  Forest = 1%  Urban = 3%  Other = 1%
NOTES: Site is 38.3 river miles upstream from confluence with Blue River and
       located in Hancock County, Indiana.  Sample collected at County
       Road 400 South bridge.  Streamflow is from U.S. Geological Survey
       streamflow gaging station 03361650 located 1.0 river miles downstream
       (drainage area of gaging station is 93.9 square miles).
Period of record for butylate and pendimethalin in this data file:  5/92 to 9/96
Period of record for bentazon and 2,4-D in this data file:          3/93 to 9/95




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| METHODS          |
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All samples were analyzed by the U.S. Geological Survey National Water Quality
Laboratory.  Samples were collected using the methods of Shelton (1994).
Pesticides were determined by Gas Chromatography/Mass Spectrometry.  Prior to
September 1992 the method of Sandstrom and others (1992) was used for butylate
and pendimethalin.  From September 1992 on, the method of Zaugg and others
(1995) was used for butylate and pendimethalin.  The method of Werner and others
(1996) was used for bentazon and 2,4-D.




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| REFERENCES       |
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Hitt, K.J., 1994, Refining 1970's land-use data with 1990 population data to
indicate new residential development: U.S. Geological Survey Water-Resources
Investigations Report 94-4250, 15 p.


Mitchell, W.B., Guptill, S.C., Anderson, K.E., Fegeas, R.G., and Hallam, C.A.,
1977, GIRAS--A Geographic Information Retrieval and Analysis System for handling
land use and land cover data: U.S. Geological Survey Professional Paper 1059,
16 p.


Sandstrom, M.W., Wydoski, D.S., Schroeder, M.P., Zamboni, J.L., and Foreman,
W.T., 1992, Methods of Analysis by the U.S. Geological Survey National Water
Quality Laboratory--Determination of organonitrogen herbicides in water by
solid-phase extraction and capillary-column gas chromatography/mass spectrometry
with selected-ion monitoring: U.S. Geological Survey Open-File Report 91-519,
34 p.


Shelton, L.R., 1994, Field guide for collecting and processing stream-water
samples for the National Water-Quality Assessment Program:  U.S. Geological
Survey Open-File Report 94-455, 42 p.


Werner, S.L., and Burkhardt, M.R., and DeRusseau, S.N., 1996, Methods of
analysis by the U.S. Geological Survey National Water Quality
Laboratory--Determination of pesticides in water by Carbopak-B solid-phase
extraction and high-performance liquid chromatography: U.S. Geological Survey
Open-File Report 96-216, 42 p.


Zaugg, S.D., Sandstrom, M.W., Smith, S.G., and Fehlberg, K.M., 1995, Methods of
Analysis by the U.S. Geological Survey National Water Quality
Laboratory--Determination of pesticides in water by C-18 solid-phase extraction
and capillary-column gas chromatography/mass spectrometry with selected-ion
monitoring: U.S. Geological Survey Open-File Report 95-181, 49 p.