Investigations of Pesticide Contamination in Varied Pesticide-Use Settings

Aga, D.S., and Thurman, E.M., 2001,

Formation and transport of the sulfonic acid metabolites of alachlor and metolachlor in soil: Environmental Science and Technology, v. 35, no. 12, p. 2455-2460, doi:10.1021/es991264s.

Aga, D.S., Thurman, E.M., and Pomes, M.L., 1996,

Measurement of concentrations of alachlor and its ethanesulfonic acid metabolite in water by solid-phase extraction and enzyme-linked immunosorbent assay, in Morganwalp, D.W., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Colorado Springs, Colorado, September 20-24, 1993: U.S. Geological Survey Water-Resources Investigations Report 94-4015, v. 1, p. 385-392.

Aga, D.S., Thurman, E.M., Yockel, M.E., Zimmerman, L.R., and Williams, T.D., 1996,

Identification of a new sulfonic acid metabolite of metolachlor in soil: Environmental Science and Technology, v. 30, no. 2, p. 592-597, doi:10.1021/es9503600.

Anderholm, S.K., 1986,

Reconnaissance of hydrology, land use, ground-water chemistry and effects of land use on ground-water chemistry in the Albuquerque-Belen basin, New Mexico: U.S. Geological Survey Water-Resources Investigations Report 86-4174, 37 p.

Antweiler, R.C., Goolsby, D.A., and Taylor, H.E., 1996,

Nutrients in the Mississippi River, 1987-92, in Meade, R.H., ed., Contaminants in the Mississippi River: U.S. Geological Survey Circular 1133, p. 73-85.

Baker, N.T., Stone, W.W., Wilson, J.T., and Meyer, M.T., 2006,

Occurrence and transport of agricultural chemicals in Leary Weber Ditch Basin, Hancock County, Indiana, 2003-04: U.S. Geological Survey Scientific Investigations Report 2006-5251, 44 p.

Barton, C., Vowinkel, E.F., and Nawyn, J.P., 1987,

Preliminary assessment of water quality and its relation to hydrogeology and land use--Potomac-Raritan-Magothy aquifer system, New Jersey: U.S. Geological Survey Water-Resources Investigations Report 87-4023, 79 p.

Battaglin, W., Drewes, J., Bruce, B., and McHugh, M., 2007,

Contaminants of emerging concern in the environment: Water Resources Impact, v. 9, no. 3, p. 3-4.

Battaglin, W.A., and Fairchild, J., 2002,

Potential toxicity of pesticides measured in midwestern streams to aquatic organisms: Water Science and Technology, v. 45, no. 9, p. 95-103.

Battaglin, W.A., Furlong, E.T., and Burkhardt, M.R., 2001,

Concentration of selected sulfonylurea, sulfonamide, and imadazolinone herbicides, other pesticides, and nutrients in 71 streams, 5 reservoir outflows, and 25 wells in the midwestern United States, 1998: U.S. Geological Survey Water-Resources Investigations Report 00-4225, 123 p.

Battaglin, W.A., Furlong, E.T., Burkhardt, M.R., and Peter, C.J., 2000,

Occurrence of sulfonylurea, sulfonamide, imidazolinone, and other herbicides in rivers, reservoirs and ground water in the Midwestern United States, 1998: The Science of the Total Environment, v. 248, no. 2-3, p. 123-133, doi:10.1016/S0048-9697(99)00536-7.

Battaglin, W.A., Furlong, E.T., Burkhardt, M.R., and Peter, C.J., 1999,

Occurrence of sulfonylurea, imidazolinone, and other herbicides in midwestern rivers, reservoirs, and ground water, 1998, in Morganwalp, D.W., and Buxton, H.T., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the Technical Meeting, Charleston, South Carolina, March 8-12, 1999--Volume 2 of 3--Contamination of Hydrologic Systems and Related Ecosystems: U.S. Geological Survey Water-Resources Investigations Report 99-4018B, p. 215-225.

Battaglin, W.A., Furlong, E.T., and Peter, C.J., 1998,

A reconnaissance for sulfonylurea herbicides in waters of the Midwestern USA: An example of collaboration between the public and private sectors: U.S. Geological Survey Fact Sheet FS-046-98, 4 p.

Battaglin, W.A., and Goolsby, D.A., 1999,

Are shifts in herbicide use reflected in concentration changes in midwestern rivers?: Environmental Science and Technology, v. 33, no. 17, p. 2917-2925, doi:10.1021/es9900149.

Battaglin, W.A., and Goolsby, D.A., 1998,

Regression models of herbicide concentrations in outflow from reservoirs in the midwestern USA, 1992-1993: Journal of the American Water Resources Association, v. 34, no. 6, p. 1369-1390, doi:10.1111/j.1752-1688.1998.tb05438.x.

Battaglin, W.A., and Goolsby, D.A., 1997,

Statistical modeling of agricultural chemical occurrence in midwestern rivers: Journal of Hydrology, v. 196, no. 1-4, p. 1-25, doi:10.1016/S0022-1694(97)00011-5.

Battaglin, W.A., and Goolsby, D.A., 1996,

Using GIS and regression to estimate annual herbicide concentrations in outflow from reservoirs in the midwestern USA, 1992-93, in AWRA Symposium on GIS and Water Resources, Ft. Lauderdale, FL, September 22-26, 1996: American Water Resources Association.

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 Open-File Report 94-4176, 87 p.

Battaglin, W.A., Goolsby, D.A., and Coupe, R., 1993,

Annual use and transport of agricultural chemicals in the Mississippi River, 1991-92, in Goolsby, D.A., Boyer, L.L., and Mallard, G.E., eds., Selected papers on agricultural chemicals in water resources of the Midcontinental United States: U.S. Geological Survey Open-File Report 93-418, p. 26-40.

Battaglin, W.A., Goolsby, D.A., and Coupe, R.H., 1996,

Annual use and transport of agricultural chemicals in the Mississippi River, 1991-92, in Morganwalp, D.W., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Colorado Springs, Colorado, September 20-24, 1993: U.S. Geological Survey Water-Resources Investigations Report 94-4015, v. 1, p. 429-440.

Battaglin, W.A., and Hay, L.E., 1996,

Effects of sampling strategies on estimates of annual mean herbicide concentrations in midwestern rivers: Environmental Science and Technology, v. 30, no. 3, p. 889-896, doi:10.1021/es950351r.

Battaglin, W.A., Kendall, C., Chang, C.C.Y., Silva, S.R., and Campbell, D.H., 2001,

Chemical and isotopic evidence of nitrogen transformation in the Mississippi River, 1997-98: Hydrological Processes, v. 15, no. 7, p. 1285-1300, doi:10.1002/hyp.214.

Battaglin, W.A., Kendall, C., Chang, C.C.Y., Silva, S.R., and Campbell, D.H., 2001,

Isotopic and chemical composition of inorganic and organic water-quality samples from the Mississippi River Basin, 1997-98: U.S. Geological Survey Water-Resources Investigations Report 01-4095, 57 p.

Battaglin, W.A., Kendall, C., Goolsby, D.A., and Boyer, L.L., 1997,

Plan of study to determine if the isotopic ratios ?15N and ?18O can reveal the sources of nitrate discharged by the Mississippi River into the Gulf of Mexico: U.S. Geological Survey Open-File Report 97-230, 18 p.

Battaglin, W.A., Kolpin, D.W., Scribner, E.A., Kuivila, K.M., and Sandstrom, M.W., 2005,

Glyphasate, other herbicides, and transformation products in midwestern streams, 2002: Journal of the American Water Resources Association, v. 41, no. 2, p. 323-332, doi:10.1111/j.1752-1688.2005.tb03738.x

Battaglin, W.A., Kuivila, K., Winton, K., and Meyer, M., 2008,

Occurrence of chlorothalonil, its transformation products, and selected other pesticides in Texas and Oklahoma streams, 2003-2004: U.S. Geological Survey Scientific Investigations Report 2008–5016, 9 p.

Battaglin, W.A., Thurman, E.M., Kalkhoff, S.J., and Porter, S.D., 2003,

Herbicides and transformation products in surface waters of the midwestern United States: Journal of the American Water Resources Association, v. 39, no. 4, p. 743-756, doi:10.1111/j.1752-1688.2003.tb04402.x.

Battaglin, W.A., Thurman, E.M., Kolpin, D.W., Scribner, E.A., Sandstrom, M.W., and Kuivila, K.M., 2003,

Work plan for determining the occurrence of glyphosate, its transformation product AMPA, other herbicide compounds, and antibiotics in midwestern United States streams, 2002: U.S. Geological Survey Open-File Report 03-69, 18 p.

Battaglin, W.A., Ulery, R., Welborn, T., and Winterstein, T., 2003,

Susceptibility of surface water in Texas to nonpoint source pesticide contamination, in Kolpin, D., and Williams, J.W., eds., AWRA 2003 Spring Specialty Conference: Agricultural Hydrology and Water Quality, Kansas City, Missouri, May 12-14, 2003: American Water Resources Association, p. on CD-ROM, TPS-03-1, ISBN:1-882132-61-0.

Battaglin, W.A., Ulery, R.L., Winterstein, T., and Welborn, T., 2003,

Estimating the susceptibility of surface water in Texas to nonpoint-source contamination by use of logistic regression modeling: U.S. Geological Survey Water-Resources Investigations Report 03-4205, 24 p.

Bergamaschi, B.A., Kuivila, K.M., and Fram, M.S., 1999,

Pesticides associated with suspended sediments in the San Francisco Bay during the first flush, December 1995, in Morganwalp, D.W., and Buxton, H.T., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the Technical Meeting, Charleston, South Carolina, March 8-12, 1999--Volume 2 of 3--Contamination of Hydrologic Systems and Related Ecosystems: U.S. Geological Survey Water-Resources Investigations Report 99-4018B, p. 23-33.

Blevins, D.W., 1991,

Planned studies of movement of nitrogen species and herbicides on claypan soils at the Management Systems Evaluation Area, Missouri, in Mallard, G.E., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Monterey, California, March 11-15, 1991: U.S. Geological Survey Water-Resources Investigations Report 91-4034, p. 240-242.

Blickwedel, R.S., and Wood, C.R., 1989,

Relation of ground-water quality to land use in the Philadelphia, Pennsylvania--Camden, New Jersey area: U.S. Geological Survey Water-Resources Investigations Report 88-4211, 58 p.

Bosch, D.D., Leonard, R.A., and Hubbard, R.K., 1996,

Unsaturated zone transport at the Plains, Georgia field site, in Morganwalp, D.W., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Colorado Springs, Colorado, September 20-24, 1993: U.S. Geological Survey Water-Resources Investigations Report 94-4015, v. 2, p. 965-969.

Boxall, A.B.A., Sinclair, C.J., Fenner, K., Kolpin, D., and Maund, S.J., 2004,

When synthetic chemicals degrade in the environment--What are the absolute fate, effects, and potential risks to humans and the ecosystem?: Environmental Science and Technology, v. 38, no. 19, p. 368A-375A.

Boxall, A.B.A., Sinclair, C.J., and Kolpin, D.W., 2006,

Potential risks of pesticide degradates to aquatic life, in Gilliom, R.J., and others, eds., Pesticides in the nation's streams and ground water, 1992-2001: U.S. Geological Survey Circular 1291, p. 81-86.

Boyd, R.A., 1999,

Herbicides and herbicide degradates in shallow ground water and the Cedar River near a municipal well field, Cedar Rapids, Iowa, in Morganwalp, D.W., and Buxton, H.T., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the Technical Meeting, Charleston, South Carolina, March 8-12, 1999--Volume 2 of 3--Contamination of Hydrologic Systems and Related Ecosystems: U.S. Geological Survey Water-Resources Investigations Report 99-4018B, p. 289-300.

Bradley, P.M., Chapelle, F.H., Jagucki, M.L., and McMahon, P.B., 1994,

Effect of atrazine on potential denitrification in aquifer sediments: Soil Biology and Biochemistry, v. 26, no. 4, p. 523-524, doi:10.1016/0038-0717(94)90186-4.

Brown, J.B., and Battaglin, W.A., 2007,

Striving for collaborative science and communication through the Consortium for Research and Education on Emerging Contaminants (CREEC): Water Resources Impact, v. 9, no. 3, p. 22-24.

Burkart, M., Kolpin, D.W., Jaquis, R., and Cole, K., 2001,

Soil characteristics and agrichemicals in groundwater of the midwestern United States: Water Science and Technology, v. 43, no. 5, p. 251-260.

Burkart, M.R., Kolpin, D.W., and James, D.E., 1999,

Assessing groundwater vulnerability to agrichemical contamination in the midwest U.S.: Water Science and Technology, v. 39, no. 3, p. 103-112.

Burkart, M.R., Ragone, S.E., Thurman, E.M., and Perry, C.A., 1989,

Planned studies of herbicides in ground and surface water in the Midcontinental United States, in Mallard, G.E., and Ragone, S.E., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Phoenix, Arizona, September 26-30, 1988: U.S. Geological Survey Water-Resources Investigations Report 88-4220, p. 445-452.

Buszka, P.M., 1987,

Relation of water chemistry of the Edwards aquifer to hydrogeology and land use, San Antonio Region, Texas: U.S. Geological Survey Water-Resources Investigations Report 87-4116, 100 p.

CENR, 2000,

Integrated assessment of hypoxia in the northern Gulf of Mexico: National Science and Technology Council Committee on Environment and Natural Resources, Washington, D.C., 58 p.

Cain, D.J., and Edelmann, P., 1987,

A reconnaissance water-quality appraisal of the Fountain Creek Alluvial Aquifer between Colorado Springs and Pueblo, Colorado, including trace elements and organic constituents: U.S. Geological Survey Water-Resources Investigations Report 86-4085, 45 p.

Cain, D.J., Helsel, D.R., and Ragone, S.E., 1987,

Reconnaissance appraisals of anthropogenic effects on regional ground-water quality, in Franks, B.J., ed., U.S. Geological Survey Program on Toxic Waste--Ground-Water Contamination--Proceedings of the third technical meeting, Pensacola, Florida, March 23-27, 1987: U.S. Geological Survey Open-File Report 87-109, p. E-25-E-31.

Capel, P.D., 1990,

A bibliography of atrazine and its simple degradation products in the environment: U.S. Geological Survey Open-File Report 89-613, 4 diskettes, 5 p.

Chen, H.H., 1988,

Agricultural chemical contamination of ground water in six areas of the High Plains aquifer, Nebraska, in National water summary 1986--Hydrologic events and ground-water quality: U.S. Geological Survey Water-Supply Paper 2325, p. 103-108.

Chen, H.H., and Druliner, A.D., 1987,

Nonpoint-source agricultural chemicals in ground water in Nebraska--Preliminary results for six areas of the High Plains aquifer: U.S. Geological Survey Water-Resources Investigations Report 86-4338, 68 p.

Chiou, C.T., Malcolm, R.L., Brinton, T.I., and Kile, D.E., 1986,

Water solubility enhancement of some organic pollutants and pesticides by dissolved humic and fulvic acids: Environmental Science and Technology, v. 20, no. 5, p. 502-508, doi:10.1021/es00147a010.

Clark, G.M., Broshears, R.E., Hooper, R.P., and Goolsby, D.A., 2002,

Evaluating the influence of source basins on downstream water quality in the Mississippi River: Journal of the American Water Resources Association, v. 38, no. 3, p. 803-818.

Clark, G.M., and Goolsby, D.A., 2000,

Occurrence and load of selected herbicides and metabolites in the lower Mississippi River: The Science of the Total Environment, v. 248, no. 2-3, p. 101-113, doi:10.1016/S0048-9697(99)00534-3.

Clark, G.M., and Goolsby, D.A., 1999,

Discharge of herbicides from the Mississippi River Basin to the Gulf of Mexico, 1991-97: U.S. Geological Survey Fact Sheet FS-163-98, 4 p.

Clark, G.M., and Goolsby, D.A., 1999,

Trends in annual herbicide loads from the Mississippi River Basin to the Gulf of Mexico, in Morganwalp, D.W., and Buxton, H.T., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the Technical Meeting, Charleston, South Carolina, March 8-12, 1999--Volume 2 of 3--Contamination of Hydrologic Systems and Related Ecosystems: U.S. Geological Survey Water-Resources Investigations Report 99-4018B, p. 237-246.

Clark, G.M., Goolsby, D.A., and Battaglin, W.A., 1999,

Seasonal and annual load of herbicides from the Mississippi River Basin to the Gulf of Mexico: Environmental Science and Technology, v. 33, no. 7, p. 981-986, doi:10.1021/es980962u.

Connell Hancock, T.L., Costello, A.M., Lidstrom, M.E., and Oremland, R.S., 1998,

Strain IMB-1--A novel bacterium for the removal of methyl bromide in fumigated agricultural soils: Applied and Environmental Microbiology, v. 64, no. 8, p. 2899-2563.

Connell, T.L., Joye, S.B., Miller, L.G., and Oremland, R.S., 1997,

Bacterial oxidation of methyl bromide in Mono Lake, California: Environmental Science and Technology, v. 31, no. 5, p. 1489-1495, doi:10.1021/es960732k.

Costanzo, S.D., Watkinson, A.J., Murby, E.J., Kolpin, D.W., and Sandstrom, M.W., 2007,

Is there a risk associated with the insect repellent DEET (N,N-diethyl-m-toluamide) commonly found inaquatic environments?: Science of the Total Environment, v. 384, no. 1-3, p. 214-220, doi:10.1016/j.scitotenv.2007.05.036.

Coupe, R.H., Goolsby, D.A., Iverson, J.L., Zaugg, S.D., and Markovchick, D.J., 1995,

Pesticide, nutrient, streamflow and physical property data for the Mississippi River and major tributaries, April 1991-September 1992: U.S. Geological Survey Open-File Report 93-657, 116 p.

Coupe, R.H., and Johnson, G.P., 1991,

Triazine herbicides in selected streams in Illinois during storm events, spring 1990, in Mallard, G.E., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Monterey, California, March 11-15, 1991: U.S. Geological Survey Water-Resources Investigations Report 91-4034, p. 343-346.

Coupe, R.H., Manning, M.A., Foreman, W.T., Goolsby, D.A., and Majewski, M.S., 2000,

Occurrence of pesticides in rain and air in urban and agricultural areas of Mississippi, April-September 1995: The Science of the Total Environment, v. 248, no. 2-3, p. 227-240, doi:10.1016/S0048-9697(99)00545-8.

Coupe, R.H., Manning, M.A., Foreman, W.T., Goolsby, D.A., and Majewski, M.S., 1999,

Occurrence of pesticides in rain and air in urban and agricultural areas of Mississippi, April-September 1995, in Morganwalp, D.W., and Buxton, H.T., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the Technical Meeting, Charleston, South Carolina, March 8-12, 1999--Volume 2 of 3--Contamination of Hydrologic Systems and Related Ecosystems: U.S. Geological Survey Water-Resources Investigations Report 99-4018B, p. 301-312.

Coupe, R.H., Thurman, E.M., and Zimmerman, L.R., 1998,

Relation of usage to the occurrence of cotton and rice herbicides in three streams of the Mississippi Delta: Environmental Science and Technology, v. 32, no. 23, p. 3673-3680, doi:10.1021/es980342t.

Coupe, R.H., Welch, H.L., Pell, A.B., and Thurman, E.M., 2005,

Herbicide and degradate flux in the Yazoo River Basin: International Journal of Environmental Analytical Chemistry, v. 85, no. 15, p. 1127-1140, doi:10.1080/03067310500273351.

Crepeau, K.L., Baker, L.M., and Kuivila, K.M., 2000,

Method of analysis and quality assurance practices for determination of pesticides in water by solid-phase extraction and capillary-column gas chromatography/mass spectrometry at the U.S. Geological Survey California District organic chemistry laboratory, 1996-1999: U.S. Geological Survey Open-File Report 00-229, 19 p.

Crepeau, K.L., Domagalski, J.L., and Kuivila, K.M., 1994,

Methods of analysis and quality assurance practices of the U.S. Geological Survey Organic Laboratory, Sacramento, California--Determination of pesticides in water by solid-phase extraction and capillary-column gaschromatography/mass spectrometry: U.S. Geological Survey Open-File Report 94-362, 17 p.

Crepeau, K.L., Kuivila, K.M., and Domagalski, J.L., 1996,

Concentrations of dissolved rice pesticides in the Colusa Basin Drain and Sacramento River, California, 1990-92, in Morganwalp, D.W., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Colorado Springs, Colorado, September 20-24, 1993: U.S. Geological Survey Water-Resources Investigations Report 94-4015, v. 2, p. 711-718.

Cromwell, A.E., and Thurman, E.M., 1996,

Atrazine transport and degradation in a pristine watershed--The fate of atrazine deposited by precipitation, in Morganwalp, D.W., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Colorado Springs, Colorado, September 20-24, 1993: U.S. Geological Survey Water-Resources Investigations Report 94-4015, v. 1, p. 423-428.

Delin, G.N., Anderson, J.L., and Dowdy, R.H., 1991,

Integrated hydrologic research at the Northern Corn Belt Sand-Plain Management System Evaluation Area, Minnesota, in Mallard, G.W., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Monterey, California, March 11-15, 1991: U.S. Geological Survey Water-Resources Investigations Report 91-4034, p. 214-218.

Delin, G.N., and Landon, M.K., 2002,

Effects of topography on the transport of agricultural chemicals to groundwater in a sand-plain setting: Hydrogeology Journal, v. 10, no. 4, p. 443-454, doi:10.1007/s10040-002-0208-6.

Delin, G.N., and Landon, M.K., 1996,

Effects of topography on the transport of agricultural chemicals near Princeton, Minnesota, 1992, in Morganwalp, D.W., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Colorado Springs, Colorado, September 20-24, 1993: U.S. Geological Survey Water-Resources Investigations Report 94-4015, v. 1, p. 555-564.

Delin, G.N., and Landon, M.K., 1993,

Effects of focused recharge on the transport of agricultural chemicals at the Princeton, Minnesota Management Systems Evaluation Area: U.S. Geological Survey Open-File Report 93-42, 8 p.

Delin, G.N., and Landon, M.K., 1993,

Effects of recharge on the transport of agricultural chemicals at the Princeton, Minnesota Management Systems Evaluation Area, 1991-92: U.S. Geological Survey Open-File Report 93-79, 2 p.

Delin, G.N., Landon, M.K., Anderson, J.L., and Dowdy, R.H., 1992,

Hydrologic research at the Princeton, Minnesota Management Systems Evaluation Area: U.S. Geological Survey Open-File Report 92-107, 2 p.

Delin, G.N., Landon, M.K., Lamb, J.A., and Anderson, J.L., 1994,

Characterization of the hydrogeology and water quality at the Management Systems Evaluation Area near Princeton, Minnesota: U.S. Geological Survey Water-Resources Investigations Report 94-4149, 54 p.

Delin, G.N., Landon, M.K., Lamb, J.A., and Anderson, J.L., 1994,

Hydrogeologic and water-quality data used to characterize the Management Systems Evaluation Area near Princeton, Minnesota: U.S. Geological Survey Open-File Report 94-337, 45 p.

Delin, G.N., Landon, M.K., Lamb, J.A., and Dowdy, R.H., 1995,

Effects of 1992 farming systems on ground-water quality at the Management Systems Evaluation Area near Princeton, Minnesota: U.S. Geological Survey Water-Resources Investigations Report 95-4104, 23 p.

Delin, G.N., Landon, M.K., Nelson, K.J., Wanty, R.B., Healy, R.W., Olsen, H.W., Böhlke, J.K., Schroyer, B.R., and Capel, P.D., 1997,

Hydrogeologic and water-quality data used to evaluate the effects of focused recharge ground-water quality near Princeton, Minnesota, 1991-95: U.S. Geological Survey Open-File Report 97-21, 30 p.

Detroy, M.G., 1989,

Seasonal variation and vertical distribution and movement of herbicides and nitrate in unsaturated and saturated alluvium underlying a cropped field, Iowa County, Iowa, in Mallard, G.E., and Ragone, S.E., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Phoenix, Arizona, September 26-30, 1988: U.S. Geological Survey Water-Resources Investigations Report 88-4220, p. 634.

Domagalski, J.L., and Kuivila, K.M., 1991,

Transport and transformation of dissolved rice pesticides in the Sacramento River Delta, Calif., in Mallard, G.E., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Monterey, California, March 11-15, 1991: U.S. Geological Survey Water-Resources Investigations Report 91-4034, p. 664-666.

Dombrowski, T.R., Wilson, G.S., and Thurman, E.M., 1998,

Investigation of anion-exchange and immunoaffinity particle-loaded membranes for the isolation of charged organic analytes from water: Analytical Chemistry, v. 70, no. 9, p. 1969-1978, doi:10.1021/ac971081t.

Druliner, A.D., 1989,

Overview of the relations of nonpoint-source agricultural chemical contamination to local hydrogeologic, soil, land-use, and hydrochemical characteristics of the High Plains aquifer of Nebraska, in Mallard, G.E., and Ragone, S.E., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Phoenix, Arizona, September 26-30, 1988: U.S. Geological Survey Water-Resources Investigations Report 88-4220, p. 411-435.

Druliner, A.D., Goolsby, D.A., and Meyer, M., 1996,

Temporal distributions of herbicide and nitrite-nitrate concentrations and loads in the West Fork of the Big Blue River, Nebraska, 1990 and 1991-92, in Morganwalp, D.W., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Colorado Springs, Colorado, September 20-24, 1993: U.S. Geological Survey Water-Resources Investigations Report 94-4015, v. 1, p. 479-485.

Druliner, A.D., and McGrath, T.S., 1996,

Predicting nitrate-nitrogen and atrazine contamination in the High Plains aquifer in Nebraska, in Morganwalp, D.W., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Colorado Springs, Colorado, September 20-24, 1993: U.S. Geological Survey Water-Resources Investigations Report 94-4015, v. 1, p. 515-524.

Eckhardt, D.A., Flipse, W.J., and Oaksford, E.T., 1989,

Relation between land use and ground-water quality in the upper glacial aquifer in Nassau and Suffolk Counties, Long Island, New York: U.S. Geological Survey Water-Resources Investigations Report 86-4142, 35 p.

Eckhardt, D.A., and Oaksford, E.T., 1988,

Relation of land use to ground-water quality in the upper glacial aquifer, Long Island, New York, in Moody, D.W., and others, eds., National water summary 1986-Hydrologic events and ground-water quality: U.S. Geological Survey Water-Supply Paper 2325, p. 115-121.

Eckhardt, D.A., Siwiec, S.F., and Cauller, S.J., 1989,

Regional appraisal of ground-water quality in five different land-use areas, Long Island, New York, in Mallard, G.E., and Ragone, S.E., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Phoenix, Arizona, September 26-30, 1988: U.S. Geological Survey Water-Resources Investigations Report 88-4220, p. 397-403.

Eckhardt, D.A., Wagenet, R.J., Thurman, E.M., and Barnes, P.L., 1996,

Fate of alachlor, atrazine, and bromide in a corn plot near Topeka, Kansas, in Morganwalp, D.W., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Colorado Springs, Colorado, September 20-24, 1993: U.S. Geological Survey Water-Resources Investigations Report 94-4015, v. 1, p. 535-541.

Eckhardt, D.A.V., and Barnes, P.L., 1991,

Spatial variability in hydraulic conductivity of a silt-loam soil near Topeka, Kansas, in Mallard, G.E., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Monterey, California, March 11-15, 1991: U.S. Geological Survey Water-Resources Investigations Report 91-4034, p. 210-213.

Eckhardt, D.A.V., Kappel, W.M., Coon, W.F., and Phillips, P.J., 1999,

Herbicides and their metabolites in Cayuga Lake and its tributaries, New York, in Morganwalp, D.W., and Buxton, H.T., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the Technical Meeting, Charleston, South Carolina, March 8-12, 1999--Volume 2 of 3--Contamination of Hydrologic Systems and Related Ecosystems: U.S. Geological Survey Water-Resources Investigations Report 99-4018B, p. 395-403.

Edmunds, J.L., Kuivila, K.M., Cole, B.E., and Cloern, J.E., 1999,

Do herbicides impair phytoplankton primary production in the Sacramento-San Joaquin River Delta?, in Morganwalp, D.W., and Buxton, H.T., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the Technical Meeting, Charleston, South Carolina, March 8-12, 1999--Volume 2 of 3--Contamination of Hydrologic Systems and Related Ecosystems: U.S. Geological Survey Water-Resources Investigations Report 99-4018B, p. 81-87.

Fairchild, J.F., Sappington, L.C., and Ruessler, D.S., 1999,

An ecological risk assessment of the potential for herbicide impacts on primary productivity of the Lower Missouri River, in Morganwalp, D.W., and Buxton, H.T., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the Technical Meeting, Charleston, South Carolina, March 8-12, 1999--Volume 2 of 3--Contamination of Hydrologic Systems and Related Ecosystems: U.S. Geological Survey Water-Resources Investigations Report 99-4018B, p. 323-330.

Fallon, J.D., and Thurman, E.M., 1996,

Determining the relative age, transport, and three-dimensional distribution of atrazine in a reservoir using immunoassay, in Morganwalp, D.W., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Colorado Springs, Colorado, September 20-24, 1993: U.S. Geological Survey Water-Resources Investigations Report 94-4015, v. 1, p. 499-504.

Fallon, J.D., Tierney, D.P., and Thurman, E.M., 2002,

Movement of atrazine and deethylatrazine through a midwestern reservoir: Journal of the American Water Works Association, v. 94, no. 11, p. 54-66.

Ferrer, I., Barcelo, D., and Thurman, E.M., 2000,

First LC/MS determination of cyanazine amide, cyanazine acid, and cyanazine in groundwater samples: Environmental Science and Technology, v. 34, no. 4, p. 714-718, doi:10.1021/es990462g.

Ferrer, I., Barcelo, D., and Thurman, E.M., 1999,

Double-disk solid-phase extraction--Simultaneous cleanup and trace enrichment of herbicides and metabolites from environmental samples: Analytical Chemistry, v. 71, no. 5, p. 1009-1015, doi:10.1021/ac980975q.

Ferrer, I., Thurman, E.M., and Barcelo, D., 1997,

Identification of ionic chloroacetanilide-herbicide metabolites in surface water and groundwater by HPLC/MS using negative ion spray: Analytical Chemistry, v. 69, no. 22, p. 4547-4553, doi:10.1021/ac9704671.

Foreman, W.T., and DeGiacomo, W.G., 1991,

Literature review of vapor pressure data for some chlorinated triazine and acetamide herbicides, in Mallard, G.E., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Monterey, California, March 11-15, 1991: U.S. Geological Survey Water-Resources Investigations Report 91-4034, p. 223-226.

Foreman, W.T., and Foster, G.D., 1991,

Isolation of multiple classes of pesticides from large-volume water samples using solid phase extraction cartridges, in Mallard, G.E., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Monterey, California, March 11-15, 1991: U.S. Geological Survey Water-Resources Investigations Report 91-4034, p. 530-533.

Foreman, W.T., Majewski, M.S., Goolsby, D.A., Wiebe, F.W., and Coupe, R.H., 2000,

Pesticides in the atmosphere of the Mississippi River Valley, part II -- air: The Science of the Total Environment, v. 248, no. 2-3, p. 213-226, doi:10.1016/S0048-9697(99)00544-6.

Foreman, W.T., Majewski, M.S., Goolsby, D.A., Wiebe, F.W., and Coupe, R.H., 1999,

Pesticides in the atmosphere of the Mississippi River Valley, Part II--Air, in Morganwalp, D.W., and Buxton, H.T., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the Technical Meeting, Charleston, South Carolina, March 8-12, 1999--Volume 2 of 3--Contamination of Hydrologic Systems and Related Ecosystems: U.S. Geological Survey Water-Resources Investigations Report 99-4018B, p. 263-274.

Furlong, E.T., Burkhardt, M.R., Gates, P.M., Werner, S.L., and Battaglin, W.A., 2000,

Routine determination of sulfonylurea, imidazolinone, and sulfonamide herbicides at nanogram-per-liter concentrations by solid-phase extraction and liquid chromatography/mass spectrometry: The Science of the Total Environment, v. 248, no. 2-3, p. 135-146, doi:10.1016/S0048-9697(99)00537-9.

Furlong, E.T., Burkhardt, M.R., Gates, P.M., Werner, S.L., and Battaglin, W.A., 1999,

Routine determination of sulfonylurea, imidazolinone, and sulfonamide herbicides at nanogram-per-liter concentrations by solid-phase extraction and liquid chromatography/mass spectrometry, in Morganwalp, D.W., and Buxton, H.T., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the Technical Meeting, Charleston, South Carolina, March 8-12, 1999--Volume 2 of 3--Contamination of Hydrologic Systems and Related Ecosystems: U.S. Geological Survey Water-Resources Investigations Report 99-4018B, p. 275-288.

Goldberg, 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., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Monterey, California, March 11-15, 1991: U.S. Geological Survey Water-Resources Investigations Report 91-4034, p. 232-239.

Goodwin, K.D., Lidstrom, M.E., and Oremland, R.S., 1997,

Marine bacterial degradation of brominated methanes: Environmental Science and Technology, v. 31, no. 11, p. 3188-3192, doi:10.1021/es970165g.

Goodwin, K.D., Schaefer, J.K., and Oremland, R.S., 1998,

Bacterial oxidation of dibromomethane and methyl bromide in natural waters and enrichment cultures: Applied and Environmental Microbiology, v. 64, no. 12, p. 4629-4636.

Goodwin, K.D., Varner, R.K., Crill, P.M., and Oremland, R.S., 2001,

Consumption of troposheric levels of methyl bromide by C1-compound-utilizing bacteria and comparison to saturation kinetics: Applied Environmental Microbiology, v. 67, no. 12, p. 5437-5443, doi:10.1128/AEM.67.12.5437-5443.2001.

Goolsby, D.A., 1995,

Dissolved herbicides, in Moody, J.A., ed., Data report on Mississippi--Upriver profiles, chemical data for water quality samples collected during four upriver transects of the Mississippi River between New Orleans, Louisiana, and St. Paul, Minnesota, May 1990-April 1992: U.S. Geological Survey Open-File Report 94-523, p. 297.

Goolsby, D.A., and Battaglin, W.A., 2001,

Long-term changes in concentrations and flux of nitrogen in the Mississippi River basin, USA: Hydrological Processes, v. 15, no. 7, p. 1209-1226, doi:10.1002/hyp.210.

Goolsby, D.A., and Battaglin, W.A., 2000,

Nitrogen in the Mississippi Basin--Estimating sources and predicting flux to the Gulf of Mexico: U.S. Geological Survey Fact Sheet 135-00, 6 p.

Goolsby, D.A., and Battaglin, W.A., 1993,

Occurrence, distribution, and transport of agricultural chemicals in surface waters of the Midwestern United States, in Goolsby, D.A., Boyer, L.L., and Mallard, G.E., eds., Selected papers on agricultural chemicals in water resources of the Midcontinental United States: U.S. Geological Survey Open-File Report 93-418, p. 1-25.

Goolsby, D.A., Battaglin, W.A., Aulenbach, B.T., and Hooper, R.P., 2001,

Nitrogen input to the Gulf of Mexico: Journal of Environmental Quality, v. 30, no. 2, p. 329-336.

Goolsby, D.A., Battaglin, W.A., Aulenbach, B.T., and Hooper, R.P., 2000,

Nitrogen flux and sources in the Mississippi River Basin: The Science of the Total Environment, v. 248, no. 2-3, p. 75-86, doi:10.1016/S0048-9697(99)00532-X.

Goolsby, D.A., Battaglin, W.A., Aulenbach, B.T., and Hooper, R.P., 1999,

Nitrogen flux and sources in the Mississippi River Basin, in Morganwalp, D.W., and Buxton, H.T., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the Technical Meeting, Charleston, South Carolina, March 8-12, 1999--Volume 2 of 3--Contamination of Hydrologic Systems and Related Ecosystems: U.S. Geological Survey Water-Resources Investigations Report 99-4018B, p. 203-213.

Goolsby, D.A., Battaglin, W.A., Fallon, J.D., Aga, D.S., Kolpin, D.W., and Thurman, E.M., 1993,

Persistence of herbicides in selected reservoirs in the Midwestern United States--Some preliminary results, in Goolsby, D.A., Boyer, L.L., and Mallard, G.E., eds., Selected papers on agricultural chemicals in water resources of the Midcontinental United States: U.S. Geological Survey Open-File Report 93-418, p. 51-63.

Goolsby, D.A., Battaglin, W.A., Fallon, J.D., Aga, D.S., Koplin, D.W., and Thurman, E.M., 1996,

Persistence of herbicides in selected reservoirs in the Midwestern United States--Some preliminary results, in Morganwalp, D.W., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Colorado Springs, Colorado, September 20-24, 1993: U.S. Geological Survey Water-Resources Investigations Report 94-4015, v. 1, p. 487-497.

Goolsby, D.A., Battaglin, W.A., Lawrence, G.B., Artz, R.S., Aulenbach, B.T., Hooper, R.P., Keeney, D.R., and Stensland, G.J., 1999,

Flux and sources of nutrients in the Mississippi-Atchafalaya River Basin--Topic 3, Report for the integrated assessment on hypoxia in the Gulf of Mexico: National Oceanic and Atmospheric Administration NOAA Coastal Ocean Program Decision Analysis Series No. 17, 129 p.

Goolsby, D.A., Battaglin, W.A., and Thurman, E.M., 1993,

Occurrence and transport of agricultural chemicals in the Mississippi River basin, July through August 1993--Floods in the Upper Mississippi River Basin, 1993: U.S. Geological Survey Circular 1120-C, 22 p.

Goolsby, D.A., Boyer, L.L., and Battaglin, W.A., 1994,

Plan of study to determine the effect of changes in herbicide use on herbicide concentrations in midwestern streams, 1989-94: U.S. Geological Survey Open-File Report 94-347, 14 p.

Goolsby, D.A., Coupe, R.H., and Markovchick, D.J., 1991,

Distribution of selected herbicides and nitrate in the Mississippi River and its major tributaries, April through June 1991: U.S. Geological Survey Water-Resources Investigations Report 91-4163, 35 p.

Goolsby, D.A., and Pereira, W.E., 1996,

Pesticides in the Mississippi River, in Meade, R.H., ed., Contaminants in the Mississippi River: U.S. Geological Survey Circular 1133, p. 86-101.

Goolsby, D.A., Scribner, E.A., Thurman, E.M., Meyer, M.T., and Pomes, M.L., 1995,

Data on selected herbicides and two triazine metabolites in precipitation in the midwestern and northeastern United States, 1990-91: U.S. Geological Survey Open-File Report 95-469, 341 p.

Goolsby, D.A., Thurman, E.M., and Kolpin, D.W., 1991,

Geographic and temporal distribution of herbicides in surface waters of the Upper Midwestern United States, 1989-90, in Mallard, G.E., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Monterey, California, March 11-15, 1991: U.S. Geological Survey Water-Resources Investigations Report 91-4034, p. 183-188.

Goolsby, D.A., Thurman, E.M., and Kolpin, D.W., 1991,

Geographic and temporal distribution of herbicides in surface waters of the upper midwestern United States, 1989-90, in Mallard, G.E., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Monterey, California, March 11-15, 1991: U.S. Geological Survey Water-Resources Investigations Report 91-4034, p. 183-188.

Goolsby, D.A., Thurman, E.M., Pomes, M.L., Meyer, M., and Battaglin, W.A., 1996,

Occurrence, deposition, and long range transport of herbicides in precipitation in the Midwestern and Northeastern United States, in Morganwalp, D.W., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Colorado Springs, Colorado, September 20-24, 1993: U.S. Geological Survey Water-Resources Investigations Report 94-4015, v. 1, p. 411-421.

Goolsby, D.A., Thurman, E.M., Pomes, M.L., Meyer, M., and Battaglin, W.A., 1993,

Occurrence, deposition, and long range transport of herbicides in precipitation in the Midwestern and Northeastern United States, in Goolsby, D.A., Boyer, L.L., and Mallard, G.E., eds., Selected papers on agricultural chemicals in water resources of the Midcontinental United States: U.S. Geological Survey Open-File Report 93-418, p. 75-89.

Goolsby, D.A., Thurman, E.M., Pomes, M.L., Meyer, M.T., and Battaglin, W.A., 1997,

Herbicides and their metabolites in rainfall--Origin, transport, and deposition patterns across the midwestern and northeastern United States, 1990-1991: Environmental Science and Technology, v. 31, no. 5, p. 1325-1333, doi:10.1021/es960847o.

Grady, S.J., 1989,

Statistical comparison of ground-water quality in four land-use areas of stratified-drift aquifers in Connecticut, in Mallard, G.E., and Ragone, S.E., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Phoenix, Arizona, September 26-30, 1988: U.S. Geological Survey Water-Resources Investigations Report 88-4220, p. 473-481.

Grady, S.J., and Weaver, M.F., 1988,

Preliminary appraisal of the effects of land use on water quality in stratified-drift aquifers in Connecticut: U.S. Geological Survey Water-Resources Investigations Report 87-4005, 41 p.

Graham, W.H., Graham, D.W., Denoyelles Jr., F., Smith, V.H., Larive, C.K., and Thurman, E.M., 1999,

Metolachlor and alachlor breakdown product formation patterns in aquatic field mesocosms: Environmental Science and Technology, v. 33, no. 24, p. 4471-4476, doi:10.1021/es990686z.

Harvey, C.A., Kolpin, D.W., and Battaglin, W.A., 1996,

Use of geographic information systems and scanning technology to create high-resolution historical land-use data sets: U.S. Geological Survey Water-Resources Investigations Report 96-4100, 41 p.

Hay, L.E., and Battaglin, W.A., 1990,

Effects of land-use buffer size on Spearman's partial correlations of land use and shallow ground-water quality: U.S. Geological Survey Water-Resources Investigations Report 89-4163, 28 p.

Helgesen, J.O., and Rutledge, A.T., 1989,

Relations between land use and water quality in the High Plains aquifer of south-central Kansas, in Mallard, G.E., and Ragone, S.E., eds., U.S. Geological Survey Toxic-Substances Hydrology Program--Proceedings of the technical meeting, Phoenix, Arizona, September 26-30, 1988: U.S. Geological Survey Water-Resources Investigations Report 88-4220, p. 437-443.

Helgesen, J.O., Stullken, L.E., and Rutledge, A.T., 1994,

Assessment of nonpoint-source contamination of the High Plains aquifer in south-central Kansas, 1987, Chapter C of Analysis of nonpoint-source ground-water contamination in relation to land use: U.S. Geological Survey Water-Supply Paper 2381-C, 51 p.

Helgesen, J.O., Stullken, L.E., and Rutledge, A.T., 1991,

Overview of nonpoint-source contamination of the High Plains aquifer in south-central Kansas, in Mallard, G.E., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Monterey, California, March 11-15, 1991: U.S. Geological Survey Water-Resources Investigations Report 91-4034, p. 301-306.

Helsel, D.R., and Ragone, S.E., 1984,

Evaluation of regional ground-water quality in relation to land use; U.S. Geological Survey Toxic Waste--Ground-Water Contamination Program: U.S. Geological Survey Water-Resources Investigations Report 84-4217, 33 p.

Hicks, D.W., McConnell, J.B., and Asmussen, L.E., 1991,

Movement and fate of agricultural chemicals in the surface and subsurface environ-ments near Plains, southwestern Georgia--Integrated work plan: U.S. Geological Survey Open-File Report 91-73, 26 p.

Hicks, D.W., McConnell, J.B., and Asmussen, L.E., 1991,

Preliminary geologic and hydrologic evalution of a small watershed near Plains, Georgia: U.S. Geological Survey Water-Resources Investigations Report 90-4146, 30 p.

Hicks, D.W., McConnell, J.B., and Asmussen, L.E., 1988,

The effect of infiltration and transport mechanisms on nitrate and chloride concentrations beneath a small watershed near Plains, Georgia, in Mallard, G.E., and Ragone, S.E., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Phoenix, Arizona, September 26-30, 1988: U.S. Geological Survey Water-Resources Investigations Report 88-4220, p. 638.

Hicks, D.W., McConnell, J.B., and Hubbard, R.K., 1991,

Effect of the unsaturated zone on the migration and retardation of a conservative tracer at the Plains, Georgia, research site, in Mallard, G.E., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Monterey, California, March 11-15, 1991: U.S. Geological Survey Water-Resources Investigations Report 91-4034, p. 597-600.

Hicks, D.W., McConnell, J.B., Persinger, H.H., Scholz, J.D., and Hubbard, R.K., 1996,

Two-dimensional distribution of a bromide tracer in the unsaturated zone at the Plains, Georgia, research site, in Morganwalp, D.W., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Colorado Springs, Colorado, September 20-24, 1993: U.S. Geological Survey Water-Resources Investigations Report 94-4015, v. 2, p. 971-982.

Hladik, M.L., and Kuivila, K.M., 2008,

Analysis of chlorothalonil and three degradates in sediment and soil: Journal of Agricultural and Food Chemistry, v. 56, no. 7, p. 2310-2314, doi:10.1021/jf703695s.

Hladik, M.L., Smalling, K.L., and Kuivila, K.M., 2008,

A multi-residue method for the analysis of pesticides and pesticide degradates in water using HLB solid-phase extraction and gas chromatography--ion trap mass spectrometry: Bulletin of Environmental Contamination and Toxicology, v. 80, no. 2, p. 139-144, doi:10.1007/s00128-007-9332-2.

Hostetler, K.A., and Thurman, E.M., 2000,

Determination of chloroacetanilide herbicide metabolites in water using high-performance liquid chromatography-diode array detection and high-performance liquid chromatography/mass spectrometry: The Science of the Total Environment, v. 248, no. 2-3, p. 147-155, doi:10.1016/S0048-9697(99)00538-0.

Hostetler, K.A., and Thurman, E.M., 1999,

Determination of chloroacetanilide herbicide metabolites in water using high-performance liquid chromatography-diode array detection and high-performance liquid chromatography/mass spectrometry, in Morganwalp, D.W., and Buxton, H.T., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the Technical Meeting, Charleston, South Carolina, March 8-12, 1999--Volume 2 of 3--Contamination of Hydrologic Systems and Related Ecosystems: U.S. Geological Survey Water-Resources Investigations Report 99-4018B, p. 345-353.

Hubbard, R.K., Bosch, D.D., Leonard, R.A., and Hicks, D.W., 1996,

Spatial variability of soil properties affecting chemical transport at the Plains, Georgia, research site, in Morganwalp, D.W., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Colorado Springs, Colorado, September 20-24, 1993: U.S. Geological Survey Water-Resources Investigations Report 94-4015, v. 2, p. 983-992.

Jagucki, M.L., Finton, C.D., Springer, A.E., and Bair, E.S., 1995,

Hydrogeology and water quality at the Management Systems Evaluation Area near Piketon, Ohio: U.S. Geological Survey Water-Resources Investigations Report 95-4139, 117 p.

Johnson, G.P., and Coupe, R.H., 1996,

Transport and concentrations of selected herbicides and nitrate in the Sangamon River, Illinois, April 1991 - March 1992, in Morganwalp, D.W., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Colorado Springs, Colorado, September 20-24, 1993: U.S. Geological Survey Water-Resources Investigations Report 94-4015, v. 1, p. 471-478.

Kalkhoff, S.J., Kolpin, D.W., Thurman, E.M., Ferrer, I., and Barcelo, D., 1998,

Degradation of chloroacetanilide herbicides--The prevalence of sulfonic and oxanilic acid metabolites in Iowa ground and surface waters: Environmental Science and Technology, v. 32, no. 11, p. 1738-1740, doi:10.1021/es971138t.

Kalkhoff, S.J., Lee, K.E., Porter, S.D., Terrio, P.J., and Thurman, E.M., 2003,

Herbicides and herbicide degradation products in upper midwest agricultural streams during August base-flow conditions: Journal of Environmental Quality, v. 32, p. 1025-1035.

Kendall, C., Battaglin, W.A., Cabana, G., Chang, C.C., Silva, S.R., Porter, S.D., Goolsby, D.A., Campbell, D.H., Hooper, R.P., and Schmitt, C.J., 1999,

Isotopic tracing of nitrogen sources and cycling in the Mississippi River Basin, in Morganwalp, D.W., and Buxton, H.T., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the Technical Meeting, Charleston, South Carolina, March 8-12, 1999--Volume 2 of 3--Contamination of Hydrologic Systems and Related Ecosystems: U.S. Geological Survey Water-Resources Investigations Report 99-4018B, p. 339-343.

Kile, D.E., and Chiou, C.T., 1989,

Water solubility enhancements of DDT and trichlorobenzene by some surfactants below and above the critical micelle concentration: Environmental Science and Technology, v. 23, no. 7, p. 832-838, doi:10.1021/es00065a012.

Kinney, C.A., Mosier, A.R., Ferrer, I., Furlong, E.T., and Mandernack, K.W., 2004,

Effects of the fungicides mancozeb and chlorothalonil on fluxes of CO2, N2O, and CH4 in a fertilized Colorado grassland soil: Journal of Geophysical Research - Atmospheres, v. 109, p. DO5303, doi:10.1029/2003JD003655.

Kinney, C.A., Mosier, A.R., Ferrer, I., Furlong, E.T., and Mandernack, K.W., 2004,

Effects of the herbicides prosulfuron and metalachlor on fluxes of CO2, N2O, and CH4 in fertilized Colorado grassland soil: Journal of Geophysical Research - Atmospheres, v. 109, p. D05304, doi:10.1029/2003JD003656.

Kish, G., Vowinkel, E., Fusillo, T., and Battaglin, W., 1987,

Relation of land use to ground-water quality in the outcrop of the Potomac-Raritan-Magothy aquifer system in New Jersey, in National water summary 1986--Hydrologic events and ground-water quality: U.S. Geological Survey Water-Supply Paper 2325, p. 109-114.

Kish, J.L., Thurman, E.M., Scribner, E.A., and Zimmerman, L.R., 2000,

Methods of analysis by the U.S. Geological Survey Organic Geochemistry Research Group--Determination of selected herbicides and their degradation products in water using solid-phase extraction and gas chromatography/mass spectrometry: U.S. Geological Survey Open-File Report 00-385, 13 p.

Klein, C., Schneider, R.J., Meyer, M.T., and Aga, D.S., 2006,

Enantiomeric separation of metolachlor and its metabolites using LC-MS and CZE: Chemosphere, v. 62, no. 10, p. 1591-1599, doi:10.1016/j.chemosphere.2005.06.048.

Kolpin, D.W., 2000,

Importance of the Mississippi River Basin for investigating agricultural--chemical contamination of the hydrologic cycle: The Science of the Total Environment, v. 248, no. 2-3, p. 71-72, doi:10.1016/S0048-9697(99)00530-6.

Kolpin, D.W., Battaglin, W.A., Conn, K.E., Furlong, E.T., Glassmeyer, S.T., Kalkhoff, S.J., Meyer, M.T., and Schnoebelen, D.J., 2008,

Occurrence of transformation products in the environment, in Boxall, A., ed., Degradation of Synthetic Chemicals in the Environment, The Handbook of Environmental Chemistry: Berlin, Springer-Verlag (Advanced Web release).

Kolpin, D.W., and Burkart, M.R., 1991,

Work plan for regional reconnaissance for selected herbicides and nitrate in ground water of the Midcontinent United States, 1991: U.S. Geological Survey Open-File Report 91-59, 18 p.

Kolpin, D.W., Burkart, M.R., and Thurman, E.M., 1994,

Herbicides and nitrate in near-surface aquifers of the Mid-Continent United States: U.S. Geological Survey Water-Supply Paper 2413, 34 p.

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-surface aquifers of the Midcontinental United States: U.S. Geological Survey Open-File Report 93-114, 61 p.

Kolpin, D.W., Fischer, E.E., and Schnoebelen, D.J., 2000,

Water-quantity and water-quality aspects of a 500-year flood--Nishnabotna River, southwest Iowa, June 1998: U.S. Geological Survey Water-Resources Investigations Report 00-4025, 6 p.

Kolpin, D.W., Goolsby, D.A., Aga, D.S., Iverson, J.L., and Thurman, E.M., 1996,

Pesticides in near-surface aquifers--Results of the Midcontinental United States ground-water reconnaissance, 1991-92, in Morganwalp, D.W., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Colorado Springs, Colorado, September 20-24, 1993: U.S. Geological Survey Water-Resources Investigations Report 94-4015, v. 1, p. 505-513.

Kolpin, D.W., Goolsby, D.A., Aga, D.S., Iverson, J.L., and Thurman, E.M., 1993,

Pesticides in near-surface aquifers--Results of the Midcontinental United States ground-water reconnaissance, 1991-92, in Goolsby, D.A., Boyer, L.L., and Mallard, G.E., eds., Selected papers on agricultural chemicals in water resources of the Midcontinental United States: U.S. Geological Survey Open-File Report 93-418, p. 64-74.

Kolpin, D.W., Hallberg, G., Sneck-Fahrer, D.A., and Libra, R., 1997,

Agricultural chemicals in Iowa's ground water, 1982-95 -- What are the trends: U.S. Geological Survey Fact Sheet FS-116-97, 4 p.

Kolpin, D.W., and Kalkhoff, S.J., 1993,

Atrazine degradation in a small stream in Iowa: Environmental Science and Technology, v. 27, no. 1, p. 134-139, doi:10.1021/es00038a014.

Kolpin, D.W., Nations, B.K., Goolsby, D.A., and Thurman, E.M., 1996,

Acetochlor in the hydrologic system in the midwestern United States, 1994: Environmental Science and Technology, v. 30, no. 5, p. 1459-1464, doi:10.1021/es9503241.

Kolpin, D.W., Stamer, J.K., Goolsby, D.A., and Thurman, E.M., 1998,

Herbicides in ground water of the Midwest--A regional study of shallow aquifers, 1991-94: U.S. Geological Survey Fact Sheet FS-076-98, 4 p.

Kolpin, D.W., and Thurman, E.M., 1995,

Post-flood occurrence of selected agricultural chemicals and volatile organic compounds in near-surface unconsolidated aquifers in the Mississippi River Basin, 1993: U.S. Geological Survey Circular 1120G, 20 p.

Kolpin, D.W., Thurman, E.M., and Goolsby, D.A., 1996,

Occurrence of selected pesticides and their metabolites in near-surface aquifers of the midwestern United States: Environmental Science and Technology, v. 30, no. 1, p. 335-340, doi:10.1021/es950341q.

Kolpin, D.W., Thurman, E.M., Lee, E.A., Meyer, M.T., Furlong, E.T., and Glassmeyer, S.T., 2006,

Urban contributions of glyphosate and its degradate AMPA to streams in the United States: Science of the Total Environment, v. 354, no. 2-3, p. 191-197, doi:10.1016/j.scitotenv.2005.01.028.

Kolpin, D.W., Thurman, E.M., and Linhart, S.M., 2001,

Occurrence of cyanazine compounds in groundwater--Degradates more prevalent than the parent compound: Environmental Science and Technology, v. 35, no. 6, p. 1217-1222, doi:10.1021/es001520x.

Kolpin, D.W., Thurman, E.M., and Linhart, S.M., 2000,

Finding minimal herbicide concentrations in ground water? Try looking for their degradates: The Science of the Total Environment, v. 248, no. 2-3, p. 115-122, doi:10.1016/S0048-9697(99)00535-5.

Kolpin, D.W., Thurman, E.M., and Linhart, S.M., 1999,

Finding minimal herbicide concentrations in ground water? Try looking for the degradates, in Morganwalp, D.W., and Buxton, H.T., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the Technical Meeting, Charleston, South Carolina, March 8-12, 1999--Volume 2 of 3--Contamination of Hydrologic Systems and Related Ecosystems: U.S. Geological Survey Water-Resources Investigations Report 99-4018B, p. 247-254.

Kolpin, D.W., Thurman, E.M., and Linhart, S.M., 1998,

The environmental occurrence of herbicides--The importance of degradates in ground water: Archives of Environmental Contamination and Toxicology, v. 35, no. 3, p. 385-390, doi:10.1007/s002449900392.

Kolpin, D.W., Zichelle, K.E., and Thurman, E.M., 1996,

Water-quality data for pesticides, nutrients, and volatile organic compounds in near-surface aquifers of the midcontinental United States, 1992-1994: U.S. Geological Survey Open-File Report 96-435, 47 p.

Komor, S.C., and Emerson, D.G., 1994,

Movements of water, solutes, and stable isotopes in the unsaturated zones of two sand plains in the upper Midwest: Water Resources Research, v. 30, no. 2, p. 253-267, 93WR03099, doi:10.1029/93WR03099.

Kuivila, K.M., 1999,

Studies relating pesticide concentrations to potential effects on aquatic organisms in the San Francisco Bay-Estuary, California, in Morganwalp, D.W., and Buxton, H.T., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the Technical Meeting, Charleston, South Carolina, March 8-12, 1999--Volume 2 of 3--Contamination of Hydrologic Systems and Related Ecosystems: U.S. Geological Survey Water-Resources Investigations Report 99-4018B, p. 11-16.

Kuivila, K.M., 1993,

Diazinon concentrations in the Sacramento and San Joaquin Rivers and San Francisco Bay, California, February 1993: U.S. Geological Survey Open-File Report 93-440, 2 p.

Kuivila, K.M., Barnett, H.D., and Edmunds, J.L., 1999,

Herbicide concentrations in the Sacramento-San Joaquin Delta, California, in Morganwalp, D.W., and Buxton, H.T., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the Technical Meeting, Charleston, South Carolina, March 8-12, 1999--Volume 2 of 3--Contamination of Hydrologic Systems and Related Ecosystems: U.S. Geological Survey Water-Resources Investigations Report 99-4018B, p. 69-79.

Kuivila, K.M., and Copeland, D.D., 1996,

Diazinon concentrations and transport in the Sacramento River and San Francisco Bay, California, February 1993, in Morganwalp, D.W., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Colorado Springs, Colorado, September 20-24, 1993: U.S. Geological Survey Water-Resources Investigations Report 94-4015, v. 2, p. 699-704.

Kuivila, K.M., and Jennings, B.E., 2007,

Input, flux, and persistence of six select pesticides in San Francisco Bay: International Journal of Environmental Analytical Chemistry, v. 87, no. 13, p. 897-911, doi:10.1080/03067310701619014.

Kuivila, K.M., and Nichols, F.H., 1991,

Overview of San Francisco Bay Estuary toxic contaminants study, in Mallard, G.E., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Monterey, California, March 11-15, 1991: U.S. Geological Survey Water-Resources Investigations Report 91-4034, p. 659-663.

Kuivila, K.M., Sheipline, R.C., and Foe, C.G., 1996,

Distribution and possible biological effects of diazinon in the San Joaquin River and the Sacramento-San Joaquin Delta, California, February 1993, in Morganwalp, D.W., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Colorado Springs, Colorado, September 20-24, 1993: U.S. Geological Survey Water-Resources Investigations Report 94-4015, v. 2, p. 705-710.

Landon, M.K., and Delin, G.N., 1995,

Ground-water quality in agricultural areas, Anoka sand plain aquifer, east-central Minnesota, 1984-90: U.S. Geological Survey Water-Resources Investigations Report 95-4024, 25 p.

Landon, M.K., Delin, G.N., Lamb, J.A., Dowdy, R.H., and Anderson, J.L., 1996,

Effects of farming systems on ground-water quality at the Princeton, Minnesota, Management Systems Evaluation Area, 1991, in Morganwalp, D.W., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Colorado Springs, Colorado, September 20-24, 1993: U.S. Geological Survey Water-Resources Investigations Report 94-4015, v. 1, p. 543-554.

Landon, M.K., Delin, G.N., Lamb, J.A., and Guo, L., 1993,

Ground-water quality at the Management Systems Evaluation Area (MSEA) near Princeton, Minnesota, 1991-92: U.S. Geological Survey Open-File Report 93-80, 2 p.

Landon, M.K., Delin, G.N., Lamb, J.A., and Guo, L., 1993,

Ground-water quality at the Management Systems Evaluation Area (MSEA) near Princeton, Minnesota, 1991: U.S. Geological Survey Open-File Report 93-43, 8 p.

Landon, M.K., Delin, G.N., Nelson, K.J., Regan, C.P., Lamb, J.A., Larson, S.J., Capel, P.D., Anderson, J.L., and Dowdy, R.H., 1997,

Water-quality and hydrogeologic data used to evaluate the effects of farming systems on ground-water quality at the Management Systems Evaluation Area near Princeton, Minnesota, 1991-95: U.S. Geological Survey Open-File Report 97-22, 31 p.

Larson, S.J., Capel, P.D., and VanderLoop, A.G., 1995,

Laboratory and quality assurance protocols for the analysis of herbicides in ground water from the Management Systems Evaluation Area, Princeton, Minnesota: U.S. Geological Survey Water-Resources Investigations Report 95-4178, 18 p.

Lawrence, G.B., Goolsby, D.A., and Battaglin, W.A., 1999,

Atmospheric deposition of nitrogen in the Mississippi River Basin, in Morganwalp, D.W., and Buxton, H.T., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the Technical Meeting, Charleston, South Carolina, March 8-12, 1999--Volume 2 of 3--Contamination of Hydrologic Systems and Related Ecosystems: U.S. Geological Survey Water-Resources Investigations Report 99-4018B, p. 331-337.

Lawrence, G.B., Goolsby, D.A., Battaglin, W.A., and Stensland, G.J., 2000,

Atmospheric nitrogen in the Mississippi River Basin--emissions, deposition and transport: The Science of the Total Environment, v. 248, no. 2-3, p. 87-99, doi:10.1016/S0048-9697(99)00533-1.

LeaMond, C.E., Haefner, R.J., Cauller, S.J., and Stackelberg, P.E., 1992,

Ground-water quality in five areas of differing land use in Nassau and Suffolk Counties, Long Island, New York, 1987-88: U.S. Geological Survey Open-File Report 91-180, 67 p.

Lee, E.A., Kish, J.L., Zimmerman, L.R., and Thurman, E.M., 2001,

Methods of analysis by the U.S. Geological Survey Organic Geochemistry Research Group--Update and additions to the determination of chloroacetanilide herbicide degradation compounds in water using high-performance liquid chromatography/mass spectrometry: U.S. Geological Survey Open-File Report 01-10, 17 p.

Lee, E.A., and Strahan, A.P., 2003,

Methods of analysis by the U.S. Geological Survey Organic Geochemistry Research Group--Determination of acetamide herbicides and their degradation products in water using online solid-phase extraction and liquid chromatography/mass spectrometry: U.S. Geological Survey Open-File Report 03-173, 17 p.

Lee, E.A., Strahan, A.P., and Thurman, E.M., 2002,

Methods of analysis by the U.S. Geological Survey Organic Geochemistry Research Group - Determination of glyphosate, aminomethylphosphonic acid, and glufosinate in water using online solid-phase extraction and high-performance liquid chromatography/mass spectrometry: U.S. Geological Survey Open-File Report 01-454, 13 p.

Lee, E.A., Strahan, A.P., and Thurman, E.M., 2002,

Methods of analysis by the U.S. Geological Survey Organic Geochemistry Research Group--Determination of triazine and phenylurea herbicides and their degradation products in water using solid-phase extraction and liquid chromatography/mass spectrometry: U.S. Geological Survey Open-File Report 02-436, 26 p.

Lee, E.A., Zimmerman, L.R., Bhullar, B.S., and Thurman, E.M., 2002,

Linker-assisted immunoassay and liquid chromatography/mass spectrometry for the analysis of glyphosate: Analytical Chemistry, v. 74, no. 19, p. 4937-4943, doi:10.1021/ac020208y.

Leonard, R.A., and Knisel, W.G., 1989,

Application of a model to evaluate agrichemical loading to ground water at the Plains, Georgia, research site, in Mallard, G.E., and Ragone, S.E., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Phoenix, Arizona, September 26-30, 1988: U.S. Geological Survey Water-Resources Investigations Report 88-4220, p. 639.

Leonard, R.A., Knisel, W.G., Davis, F.M., and Truman, C.C., 1991,

Application of the gleams model at the Plains, Georgia, agricultural-management site, in Mallard, G.E., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Monterey, California, March 11-15, 1991: U.S. Geological Survey Water-Resources Investigations Report 91-4034, p. 601-604.

Leonard, R.A., Marti, L.R., Hicks, D.W., and McConnell, J.B., 1996,

Fate and transport of atrazine at the Plains, Georgia, ground water study site, in Morganwalp, D.W., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Colorado Springs, Colorado, September 20-24, 1993: U.S. Geological Survey Water-Resources Investigations Report 94-4015, v. 2, p. 955-964.

Lerch, R.N., Blanchard, P.E., and Thurman, E.M., 1998,

Contribution of hydroxylated atrazine degradation products to the total atrazine load in midwestern streams: Environmental Science and Technology, v. 32, no. 1, p. 40-48, doi:10.1021/es970447g.

Lerch, R.N., Thurman, E.M., and Blanchard, P.E., 1999,

Hydroxyatrazine in soils and sediments: Environmental Toxicology and Chemistry, v. 18, no. 10, p. 2161-2168, doi:10.1897/1551-5028(1999)018<2161:HISAS>2.3.CO;2.

Lerch, R.N., Thurman, E.M., and Kruger, E.L., 1997,

Mixed-mode sorption of hydroxylated atrazine degradation products to soil--A mechanism for bound residue: Environmental Science and Technology, v. 31, no. 5, p. 1539-1546, doi:10.1021/es960811w.

Lin, C.H., Lerch, R.N., Thurman, E.M., Garrett, H.E., and George, M.F., 2002,

Determination of isoxaflutole (balance) and its metabolites in water using solid phase extraction followed by high-performance liquid chromatography with ultraviolet or mass spectrometry: Journal of Agricultural and Food Chemistry, v. 50, no. 21, p. 5816-5824, doi:10.1021/jf025622d.

Liszewski, M.J., and Squillace, P.J., 1991,

The effect of surface-water and ground-water exchange on the transport and storage of atrazine in the Cedar River, Iowa, in Mallard, G.E., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Monterey, California, March 11-15, 1991: U.S. Geological Survey Water-Resources Investigations Report 91-4034, p. 195-202.

Liu, S., Lu, J., Kolpin, D.W., and Meeker, W.Q., 1997,

Analysis of environmental data with censored observations: Environmental Science and Technology, v. 31, no. 12, p. 3358-3362, doi:10.1021/es960695x.

Liu, S., Yen, S., and Kolpin, D.W., 1996,

Pesticides in groundwater--Do atrazine metabolites matter?: Water Resources Bulletin, v. 32, no. 4, p. 845-853, doi:10.1111/j.1752-1688.1996.tb03481.x.

MacCoy, D., Crepeau, K.L., and Kuivila, K.M., 1995,

Dissolved pesticide data for the San Joaquin River at Vernalsi and the Sacramento River at Sacramento, California, 1991-1994: U.S. Geological Survey Open-File Report 95-110, 27 p.

Majewski, M.S., Foreman, W.F., Goolsby, D.A., and Nakagaki, N., 1998,

Airborne pesticide residues along the Mississippi River: Environmental Science and Technology, v. 32, no. 23, p. 3689-3698, doi:10.1021/es9802403.

Majewski, M.S., Foreman, W.T., and Goolsby, D.A., 2000,

Pesticides in the atmosphere of the Mississippi River Valley, part I -- rain: The Science of the Total Environment, v. 248, no. 2-3, p. 201-212, doi:10.1016/S0048-9697(99)00543-4.

Majewski, M.S., Foreman, W.T., and Goolsby, D.A., 1999,

Pesticides in the atmosphere of the Mississippi River Valley, Part I--Rain, in Morganwalp, D.W., and Buxton, H.T., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the Technical Meeting, Charleston, South Carolina, March 8-12, 1999--Volume 2 of 3--Contamination of Hydrologic Systems and Related Ecosystems: U.S. Geological Survey Water-Resources Investigations Report 99-4018B, p. 255-261.

Mast, M.A., Campbell, D.H., Ingersoll, G.P., Foreman, W.T., and Krabbenhoft, D.P., 2003,

Atmospheric deposition of nutrients, pesticides, and mercury in Rocky Mountain National Park, Colorado, 2002: U.S. Geological Survey Water-Resources Investigations Report 03-4241 (Online only), 15 p.

McDonald, I.R., Warner, K.L., McAnulla, C., Woodall, C.A., Oremland, R.S., and Murrell, J.C., 2002,

A review of bacterial methyl halide degradation--Biochemistry genetics and molecular ecology: Environmental Microbiology, v. 4, no. 4, p. 193-203, doi:10.1046/j.1462-2920.2002.00290.x.

McIsaac, G.F., David, M.B., Gertner, G.Z., and Goolsby, D.A., 2002,

Relating net nitrogen input in the Mississippi River Basin to nitrate flux in the Lower Mississippi River--A comparison of approaches: Journal of Environmental Quality, v. 31, p. 1610-1622.

McMahon, P.B., Chapelle, F.H., and Jagucki, M.L., 1992,

Atrazine mineralization potential of alluvial aquifer sediments under aerobic conditions: Environmental Science and Technology, v. 26, no. 8, p. 1556-1559, doi:10.1021/es00032a010.

Meyer, M.T., Bumgarner, J.E., Varns, J.L., Daughtridge, J.V., Thurman, E.M., and Hostetler, K.A., 2000,

Use of radioimmunoassay as a screen for antibiotics in confined animal feeding operations and confirmation by liquid chromatography/mass spectrometry: The Science of the Total Environment, v. 248, no. 2-3, p. 181-187, doi:10.1016/S0048-9697(99)00541-0.

Meyer, M.T., Lee, E.A., and Scribner, E.A., 2007,

Methods of analysis by the U.S. Geological Survey Organic Geochemistry Research Group--Determination of dissolved isoxaflutole and its sequential degradation products, diketonitrile and benzoic acid, in water using solid-phase extraction and liquid chromatography/tandem mass spectrometry: U.S. Geological Survey Techniques and Methods, book 5, sec. A, chap. 9, 13 p.

Meyer, M.T., Scribner, E.A., and Kalkhoff, S.J., 2007,

Comparison of fate and transport of isoxaflutole to atrazine and metolachlor in 10 Iowa rivers: Environmental Science and Technology, v. 41, no. 20, p. 6933-6939, doi:10.1021/es070903t.

Meyer, M.T., and Thurman, E.M., 1996,

The transport and degradation of cyanazine metabolites in surface water of the Midwestern United States, in Morganwalp, D.W., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Colorado Springs, Colorado, September 20-24, 1993: U.S. Geological Survey Water-Resources Investigations Report 94-4015, v. 1, p. 463-470.

Meyer, M.T., Thurman, E.M., and Goolsby, D.A., 2001,

Differentiating nonpoint sources of deisopropylatrazine in surface water using discrimination diagrams: Journal of Environmental Quality, v. 30, no. 5, p. 1836-1843.

Meyers, W.J., and Kuivila, K.M., 1996,

Method for estimating the activity of carbofuran-degrading microorganisms in environmental samples, in Morganwalp, D.W., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Colorado Springs, Colorado, September 20-24, 1993: U.S. Geological Survey Water-Resources Investigations Report 94-4015, v. 2, p. 719-723.

Miller, L.G., Connell, T.L., Guidetti, J.R., and Oremland, R.S., 1997,

Bacterial oxidation of methyl bromide in fumigated agricultural soils: Applied and Environmental Microbiology, v. 63, no. 11, p. 4346-4354.

Mills, M.S., and Thurman, E.M., 1994,

Preferential dealkylation reactions of s-triazine herbicides in the unsaturated zone: Environmental Science and Technology, v. 28, no. 4, p. 600-605, doi:10.1021/es00053a011.

Mills, M.S., and Thurman, E.M., 1994,

Reduction of nonpoint-source contamination of surface water and ground water by starch encapsulation of herbicides: Environmental Science and Technology, v. 28, no. 1, p. 73-79, doi:10.1021/es00050a011.

Mills, M.S., Thurman, E.M., Wing, R.E., and Barnes, P.L., 1991,

Dissipation of starch-encapsulated herbicides--A field comparison with powdered herbicides, in Mallard, G.E., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Monterey, California, March 11-15, 1991: U.S. Geological Survey Water-Resources Investigations Report 91-4034, p. 203-209.

Mills, P.C., Kolpin, D.W., Scribner, E.A., and Thurman, E.M., 2005,

Herbicides and degradates in shallow aquifers of Illinois - Spatial and temporal trends: Journal of the American Water Resources Association, v. 41, no. 3, p. 537-547, doi:10.1111/j.1752-1688.2005.tb03753.x.

Mishra, A., Ray, C., and Kolpin, D.W., 2004,

Use of qualitative and quantitative information in neural networks for assessing agricultural chemical contamination of domestic wells: Journal of Hydrologic Engineering, v. 9, no. 6, p. 502-511, doi:10.1061/(ASCE)1084-0699(2004)9:6(502).

Moody, J.A., and Battaglin, W.A., 1996,

Chemical character of the Mississippi River, in Meade, R.H., ed., Contaminants in the Mississippi River, 1987-92: U.S. Geological Survey Circular 1133, p. 31-39.

Moody, J.A., and Goolsby, D.A., 1993,

Spatial variability of triazine herbicides in the lower Mississippi River: Environmental Science and Technology, v. 27, no. 10, p. 2120-2126, doi:10.1021/es00047a018.

Morton, M.D., Walters, F.H., Aga, D.S., Thurman, E.M., and Larive, C.K., 1997,

Nuclear magnetic resonance identification of new solfonic acid metabolites of chloroacetanilide herbicides: Journal of Agricultural and Food Chemistry, v. 45, no. 4, p. 1240-1243, doi:10.1021/jf960453g.

Mueller, D.K., Ruddy, B.C., and Battaglin, W.A., 1996,

Relation of nitrate concentrations in surface water to land use in the Upper-Midwestern United States, 1989-90, in Morganwalp, D.W., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Colorado Springs, Colorado, September 20-24, 1993: U.S. Geological Survey Water-Resources Investigations Report 94-4015, v. 1, p. 441-448.

Mueller, D.K., Ruddy, B.C., and Battaglin, W.A., 1993,

Relation of nitrate concentrations in surface water to land use in the upper-Midwestern United States, 1989-90, in Goolsby, D.A., Boyer, L.L., and Mallard, G.E., eds., Selected papers on agricultural chemicals in water resources of the Midcontinental United States: U.S. Geological Survey Open-File Report 93-418, p. 41-50.

Navoy, A.S., 1996,

Use of flowpath simulation to determine contributing areas and traveltimes of nonpoint-source ground-water contamination, Gloucester County, New Jersey, in Morganwalp, D.W., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Colorado Springs, Colorado, September 20-24, 1993: U.S. Geological Survey Water-Resources Investigations Report 94-4015, v. 2, p. 1011-1019.

Navoy, A.S., Vowinkel, E.F., Buxton, H.T., and Stackelberg, P.E., 1991,

Plans for research of nonpoint-source ground-water contamination in the Coastal Plain of the Northeastern United States, in Mallard, G.E., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Monterey, California, March 11-15, 1991: U.S. Geological Survey Water-Resources Investigations Report 91-4034, p. 349-351.

Nolan, B.T., Bayless, E.R., Green, C.T., Garb, S., Voss, F.D., Lampe, D.C., Barbash, J.E., Capel, P., and Bekins, B., 2005,

Evaluation of unsaturated-zone solute-transport models for studies of agricultural chemicals: U.S. Geological Survey Open-File Report 2005-1196, 21 p.

Obenhuber, D.C., 1989,

Microbial mineralization of atrazine in surface soil and aquifer material during alternating aerobic and anaerobic incubation, in Mallard, G.E., and Ragone, S.E., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Phoenix, Arizona, September 26-30, 1988: U.S. Geological Survey Water-Resources Investigations Report 88-4220, p. 641.

Obenhuber, D.C., and Lowrance, R.R., 1989,

Nitrate transformations in the recharge area of the Clairborne aquifer near Plains, Georgia, in Mallard, G.E., and Ragone, S.E., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Phoenix, Arizona, September 26-30, 1988: U.S. Geological Survey Water-Resources Investigations Report 88-4220, p. 640.

Oblinger, C.J., Gill, A.C., McPherson, A.K., Meyer, M.T., and Furlong, E.T., 2007,

Occurrence of selected pharmaceuticals, personal-care products, organic wastewater compounds, and pesticides in the lower Tallapoosa River watershed near Montgomery, Alabama, 2005: U.S. Geological Survey Scientific Investigations Report 2007-5266, 23 p.

Oltmann, R.N., 1996,

Hydrodynamics of California's Sacramento-San Joaquin Delta, and the collection of flow data for the tracking of pesticides, in Morganwalp, D.W., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Colorado Springs, Colorado, September 20-24, 1993: U.S. Geological Survey Water-Resources Investigations Report 94-4015, v. 2, p. 695-698.

Oremland, R.S., Connell, T.L., and Miller, L.G., 2000,

Method for enhancing oxidation of methyl bromide with strain IMB-1 (ATCC200197) during agricultural fumigations: U.S. Patent No. 6,013,254.

Oremland, R.S., Miller, L.G., Culbertson, C.W., Connell, T.L., and Jahnke, L.L., 1994,

Degradation of methyl bormide by methanotropic bacteria in cell suspensions and soils: Applied and Environmental Microbiology, v. 60, no. 10, p. 3640-3646.

Oremland, R.S., Miller, L.G., and Strohmaier, F.E., 1994,

Degradation of methylbromide in anaerobic sediments: Environmental Science and Technology, v. 28, no. 3, p. 514-520, doi:10.1021/es00052a026.

Orlando, J.L., Jacobson, L.A., and Kuivila, K.M., 2004,

Dissolved pesticide and organic carbon concentrations detected in surface waters, northern Central Valley, California, 2001–2002: U.S. Geological Survey Open-File Report 2004-1214, 32 p.

Orlando, J.L., and Kuivila, K.M., 2006,

Seasonal changes in concentrations of dissolved pesticides and organic carbon in the Sacramento–San Joaquin Delta, California, 1994–1996: U.S. Geological Survey Data Series 197, 32 p.

Pereira, W.E., Domagalski, J.L., Hostettler, F.D., Brown, L.R., and Rapp, J.B., 1996,

Occurrence and accumulation of pesticides and organic contaminants in river sediment, water and clam tissues from the San Joaquin River and tributaries, California: Environmental Toxicology and Chemistry, v. 15, no. 2, p. 172-180, doi:10.1897/1551-5028(1996)015<0172:OAAOPA>2.3.CO;2.

Pereira, W.E., and Hostettler, F.D., 1993,

Nonpoint source contamination of the Mississippi River and its tributaries by herbicides: Environmental Science and Technology, v. 27, no. 8, p. 1542-1552, doi:10.1021/es00045a008.

Pereira, W.E., Hostettler, F.D., Cashman, J.R., and Nishioka, R.S., 1996,

Distributions of organochlorine compounds in sediments and livers of Striped Bass (Morone saxatilis) in San Francisco Bay-Delta Estuary, in Morganwalp, D.W., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Colorado Springs, Colorado, September 20-24, 1993: U.S. Geological Survey Water-Resources Investigations Report 94-4015, v. 2, p. 725-733.

Pereira, W.E., Hostettler, F.D., Cashman, J.R., and Nishioka, R.S., 1994,

Occurrence and distribution of organochlorine compounds in sediment and livers of Striped Bass (Morone saxatilis) from the San Francisco Bay-Delta Estuary: Marine Pollution Bulletin, v. 28, no. 7, p. 434-441, doi:10.1016/0025-326X(94)90129-5.

Pereira, W.E., Hostettler, F.D., and Rapp, J.B., 1996,

Distributions and fate of chlorinated pesticides, biomarkers and polycyclic aromatic hydrocarbons in sediments along a contamination gradient from a point-source in San Francisco Bay, California: Marine Environmental Research, v. 41, no. 3, p. 299-314, doi:10.1016/0141-1136(95)00021-6.

Pereira, W.E., and Rostad, C.E., 1990,

Occurrence, distributions, and transport of herbicides and their degradation products in the lower Mississippi River and its tributaries: Environmental Science and Technology, v. 24, no. 9, p. 1400-1406, doi:10.1021/es00079a015.

Pereira, W.E., Rostad, C.E., and Leiker, T.J., 1992,

Synthetic organic agrochemicals in the lower Mississippi River and its major tributaries--Distribution, transport and fate: Journal of Contaminant Hydrology, v. 9, p. 175-188, doi:10.1016/0169-7722(92)90057-L.

Pereira, W.E., Rostad, C.E., and Leiker, T.J., 1990,

Distribution of agrochemicals in the lower Mississippi River and its tributaries: The Science of the Total Environment, v. 97/98, p. 41-53, doi:10.1016/0048-9697(90)90229-N.

Pereira, W.E., Rostad, C.E., and Leiker, T.J., 1989,

Preliminary assessment of the fate and transport of synthetic organic agrochemicals in the lower Mississippi River and its tributaries, in Mallard, G.E., and Ragone, S.E., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Phoenix, Arizona, September 26-30, 1988: U.S. Geological Survey Water-Resources Investigations Report 88-4220, p. 453-464.

Phillips, P.J., Wall, G.R., Thurman, E.M., Eckhardt, D.A., and Vanhoesen, J., 1999,

Metolachlor and its metabolites in tile drain and stream runoff in the Canajoharie Creek watershed: Environmental Science and Technology, v. 33, no. 20, p. 3531-3537, doi:10.1021/es9811997.

Pinsky, P., Lorber, M., Johnson, K., Kross, B., Burmeister, L., Wilkins, A., Hallberg, G., and Thurman, M., 1997,

A study of the temporal variability of atrazine in private well water. Part II--Analysis of data: Environmental Monitoring and Assessment, v. 47, no. 2, p. 197-221, doi:10.1023/A:1005704920640.

Pomes, M.L., Green, W.R., Thurman, E.M., Orem, W.H., and Lerch, H.T., 1997,

Source characterization of disinfection byproduct precursors in two Arkansas water-supply reservoirs: U.S. Geological Survey Fact Sheet 118-97, 4 p.

Pomes, M.L., Holub, D.F., Aga, D.S., and Thurman, E.M., 1996,

Isocratic separation of alachlor ethanesulfonic acid, alachlor oxoacetic acid, and hydroxyatrazine by reversed-phase liquid chromatography, in Morganwalp, D.W., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Colorado Springs, Colorado, September 20-24, 1993: U.S. Geological Survey Water-Resources Investigations Report 94-4015, v. 1, p. 393-400.

Pomes, M.L., Larive, C.K., Thurman, E.M., Green, W.R., Orem, W.H., and Rostad, C.E., 2000,

Sources and haloacetic acid/trihalomethane formation potentials of aquatic humic substances in the Wakarusa River and Clinton Lake near Lawrence, Kansas: Environmental Science and Technology, v. 34, no. 20, p. 4278-4286, doi:10.1021/es991376j.

Pomes, M.L., Thurman, E.M., Aga, D.S., and Goolsby, D.A., 1998,

Evaluation of microtiter-plate enzyme-linked immunosorbent assay for the analysis of triazine and chloroacetanilide herbicides in rainfall: Environmental Science and Technology, v. 32, no. 1, p. 163-168, doi:10.1021/es970462l.

Pomes, M.L., Thurman, E.M., and Goolsby, D.A., 1991,

Comparison of microtitre-plate, enzyme-linked immunosorbent assay (ELISA) and gas chromatography/mass spectrometry (GC/MS) for analysis of herbicides in storm runoff samples, in Mallard, G.E., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Monterey, California, March 11-15, 1991: U.S. Geological Survey Water-Resources Investigations Report 91-4034, p. 572-575.

Rebich, R.A., Coupe, R.H., and Thurman, E.M., 2004,

Herbicide concentrations in the Mississippi River Basin--the importance of chloroacetanilide herbicide degradates: The Science of the Total Environment, v. 321, no. 1-3, p. 189-199, doi:10.1016/j.scitotenv.2003.09.006.

Robinson, G.R., Larkins, P., Boughton, C.J., Reed, B.W., and Sibrell, P.L., 2007,

Assessment of contamination from arsenical pesticide use on orchards in the great valley region, Virginia and West Virginia, USA: Journal of Environmental Quality, v. 36, no. 3, p. 654-663, doi:10.2134/jeq2006.0413.

Rutledge, A.T., 1992,

Comparisons of ground-water quality in selected land use areas, central Florida, in Subitzky, S., ed., Selected papers in the hydrologic sciences, 1988-92: U.S. Geological Survey Water-Supply Paper 2340, p. 1-7.

Rutledge, A.T., 1987,

Effects of land uses on ground-water quality in Central Florida--Preliminary results--U.S. Geological Survey Toxic Waste-Ground-Water Contamination Program: U.S. Geological Survey Water-Resources Investigations Report 86-4163, 54 p.

Rutledge, A.T., and Helgesen, J.O., 1991,

A steady-state unsaturated-zone model to simulate pesticide transport: U.S. Geological Survey Water-Resources Investigations Report 90-4164, 13 p.

Rutledge, A.T., and Helgesen, J.O., 1990,

Characterization of ground-water flow and chemical transport beneath two irrigated fields in south-central Kansas, 1988: U.S. Geological Survey Water-Resources Investigations Report 90-4065, 37 p.

Rutledge, A.T., and Helgesen, J.O., 1989,

Use of a simplified transport model for pesticides in the unsaturated zone, in Mallard, G.E., and Ragone, S.E., eds., U.S. Geological Survey Toxic-Substances Hydrology Program--Proceedings of the technical meeting, Phoenix, Arizona, September 26-30, 1988: U.S. Geological Survey Water-Resources Investigations Report 88-4220, p. 523-530.

Sandstrom, M.W., Kolpin, D.W., Thurman, E.M., and Zaugg, S.D., 2005,

Widespread detection of N,N-diethyl-m-toluamide in U.S. streams--Comparison with concentrations of pesticides, personal care products, and other organic wastewater compounds: Environmental Toxicology and Chemistry, v. 24, no. 5, p. 1029-1034, doi:10.1897/04-297R.1.

Schaefer, J.E., Goodwin, K.D., MacDonald, I., Murrell, J.C., and Oremland, R.S., 2002,

Leisingera methylohalidivorans, gen. nov., sp. nov., a marine methylotroph that grows on methyl bromide: International Journal of Systematic and Evolutionary Microbiology, v. 52, p. 851-859, doi:10.1099/ijs.0.01960-0.

Schaefer, J.K., and Oremland, R.S., 1999,

Oxidation of methyl halides by the facultative methlotroph strain IMB-1: Applied and Environmental Microbiology, v. 65, no. 11, p. 5035-5041.

Schottler, S.P., Eisenreich, S.J., and Capel, P.D., 1991,

Relations between water discharge and herbicide concentration in the Minnesota River, Minnesota, in Mallard, G.E., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Monterey, California, March 11-15, 1991: U.S. Geological Survey Water-Resources Investigations Report 91-4034, p. 338-342.

Schulmeyer, P.M., 1991,

Relation of selected water-quality constituents to river stage in the Cedar River, Iowa, in Mallard, G.E., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Monterey, California, March 11-15, 1991: U.S. Geological Survey Water-Resources Investigations Report 91-4034, p. 227-231.

Schulmeyer, P.M., Barnes, K.K., and Squillace, P.J., 1995,

Hydrologic data from the lower Cedar River Basin, Iowa, 1989-1991: U.S. Geological Survey Open-File Report 94-711-W, 116 p.

Scribner, E.A., Battaglin, W.A., Dietze, J.E., and Thurman, E.M., 2003,

Reconnaissance data for glyphosate, other selected herbicides, their degradation products, and antibiotics in 51 streams in nine Midwestern States, 2002: U.S. Geological Survey Open-File Report 03-217, 101 p.

Scribner, E.A., Battaglin, W.A., Gilliom, R.J., and Meyer, M.T., 2007,

Concentrations of glyphosate, its degradation product, aminomethylphosphonic acid, and glufosinate in ground- and surface-water, rainfall, and soil samples collected in the United States, 2001-06: U.S. Geological Survey Scientific Investigations Report 2007-5122, 112 p.

Scribner, E.A., Battaglin, W.A., Goolsby, D.A., and Thurman, E.M., 2000,

Changes in herbicide concentrations in Midwestern streams in relation to changes in use, 1989-1998: The Science of the Total Environment, v. 248, no. 2-3, p. 255-263, doi:10.1016/S0048-9697(99)00547-1.

Scribner, E.A., Battaglin, W.A., Goolsby, D.A., and Thurman, E.M., 1999,

Changes in herbicide concentrations in midwestern streams in relation to changes in use, 1989-98, in Morganwalp, D.W., and Buxton, H.T., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the Technical Meeting, Charleston, South Carolina, March 8-12, 1999--Volume 2 of 3--Contamination of Hydrologic Systems and Related Ecosystems: U.S. Geological Survey Water-Resources Investigations Report 99-4018B, p. 313-321.

Scribner, E.A., Goolsby, D.A., Battaglin, W.A., Meyer, M.T., and Thurman, E.M., 2006,

Concentrations of selected herbicides, herbicide degradation products, and nutrients in the lower Mississippi river, Louisiana, April 1991 through December 2003: U.S. Geological Survey Data Series 165, 84 p.

Scribner, E.A., Goolsby, D.A., Thurman, E.M., and Battaglin, W.A., 1998,

A reconnaissance for selected herbicides and nutrients in streams of nine Midwestern States, 1994-95: U.S. Geological Survey Open-File Report 98-181, 44 p.

Scribner, E.A., Goolsby, D.A., Thurman, E.M., Meyer, M.T., and Battaglin, W.A., 1996,

Concentrations of selected herbicides, herbicide metabolites, and nutrients in outflow from selected midwestern reservoirs, April 1992 through September 1993: U.S. Geological Survey Open-File Report 96-393, 128 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 nutrients 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., Meyer, M.T., and Kalkhoff, S.J., 2006,

Occurrence of isoxaflutole, acetamide, and triazine herbicides and their degradation products in 10 Iowa rivers draining to the Mississippi and Missouri Rivers, 2004: U.S. Geological Survey Scientific Investigations Report 2006-5169, 84 p.

Scribner, E.A., Orlando, J., Battaglin, W.A., Sandstrom, M.W., Kuivila, K., and Meyer, M.T., 2006,

Results of analysis of the fungicide chlorothalonil, its degradation products, and other selected pesticides at 22 surface-water sites in five southern States, 2003-04: U.S. Geological Survey Open-File Report 2006-1207, 59 p.

Scribner, E.A., Thurman, E.M., and Goolsby, D.A., 1996,

Reconnaissance data for selected herbicides and two atrazine metabolites in surface water of the Midwestern United States--Chemical analysis by immunoassay and gas chromatography/mass spectrometry, in Morganwalp, D.W., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Colorado Springs, Colorado, September 20-24, 1993: U.S. Geological Survey Water-Resources Investigations Report 94-4015, v. 1, p. 449-453.

Scribner, E.A., Thurman, E.M., Goolsby, D.A., Meyer, M.T., Battaglin, W.A., and Kolpin, D.W., 2005,

Summary of significant results from studies of triazine herbicides and their degradation products in surface water, ground water, and precipitation in the midwestern United States during the 1990s: U.S. Geological Survey Scientific Investigations Report 2005-5094, 33 p.

Scribner, E.A., Thurman, E.M., Goolsby, D.A., Meyer, M.T., Mills, M.S., and Pomes, M.L., 1993,

Reconnaissance data for selected herbicides, two atrazine metabolites, and nitrate in surface water of the Midwestern United States, 1989-90: U.S. Geological Survey Open-File Report 93-457, 77 p.

Scribner, E.A., Thurman, E.M., and Zimmerman, L.R., 2000,

Analysis of selected herbicide metabolites in surface and ground water of the United States: The Science of the Total Environment, v. 248, no. 2-3, p. 157-167, doi:10.1016/S0048-9697(99)00539-2.

Scribner, E.A., Thurman, E.M., and Zimmerman, L.R., 1999,

Analysis of selected herbicide metabolites in surface and ground water of the United States, in Morganwalp, D.W., and Buxton, H.T., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the Technical Meeting, Charleston, South Carolina, March 8-12, 1999--Volume 2 of 3--Contamination of Hydrologic Systems and Related Ecosystems: U.S. Geological Survey Water-Resources Investigations Report 99-4018B, p. 355-365.

Siwiec, S.F., Battaglin, W.A., Vowinkel, E.F., and Oaksford, E.T., 1989,

Effects of human activities and hydrogeology on water quality in the unconfined Coastal-Plain aquifers of New York and New Jersey--A plan of study, in Mallard, G.E., and Ragone, S.E., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Phoenix, Arizona, September 26-30, 1988: U.S. Geological Survey Water-Resources Investigations Report 88-4220, p. 636.

Smalling, K.L., Orlando, J., and Kuivila, K., 2007,

Occurrence of pesticides in water, sediment, and soil from the Yolo Bypass, California: San Francisco Estuary and Watershed Science, v. 5, no. 1, article 2 (Article 2).

Smith, C.N., and Parrish, R.S., 1991,

Preliminary results of a pesticide leaching study at Plains, Georgia, in Mallard, G.E., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Monterey, California, March 11-15, 1991: U.S. Geological Survey Water-Resources Investigations Report 91-4034, p. 605-609.

Soenksen, P.J., 1996,

Transport of agricultural chemicals in surface flow, tileflow, and streamflow of Walnut Creek watershed near Ames, Iowa, April 1991-September 1993: U.S. Geological Survey Water-Resources Investigations Report 96-4017, 41 p.

Soenksen, P.J., Hatfield, J.L., and Baker, J.L., 1992,

Management systems evaluation area--Iowa, Walnut Creek Watershed: U.S. Geological Survey Open-File Report 92-167, 2 p.

Soenksen, P.J., Hatfield, J.L., and Schmitz, D.J., 1996,

Chemical loads of nitrate, atrazine, and metolachlor in Walnut Creek watershed near Ames, Iowa, 1991-92, in Morganwalp, D.W., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Colorado Springs, Colorado, September 20-24, 1993: U.S. Geological Survey Water-Resources Investigations Report 94-4015, v. 1, p. 597-605.

Squillace, P.J., Caldwell, J.P., Schulmeyer, P.M., and Harvey, C.A., 1996,

Movement of agricultural chemicals between surface water and ground water, lower Cedar River basin, Iowa: U.S. Geological Survey Water-Supply Paper 2448, 59 p.

Squillace, P.J., and Engberg, R.A., 1988,

Surface-water quality of the Cedar River basin, Iowa-Minnesota, with emphasis on the occurrence and transport of herbicides, May 1984 through November 1985: U.S. Geological Survey Water-Resources Investigations Report 88-4060, 81 p.

Squillace, P.J., Liszewski, M.J., and Thurman, E.M., 1993,

Agricultural chemical interchange between ground water and surface water, Cedar River Basin, Iowa and Minnesota--A study description: U.S. Geological Survey Open-File Report 92-85, 26 p.

Squillace, P.J., and Pollock, D.W., 1996,

Comparison of simulated and observed movement of bank-storage water adjacent to the Cedar River, Iowa, in Morganwalp, D.W., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Colorado Springs, Colorado, September 20-24, 1993: U.S. Geological Survey Water-Resources Investigations Report 94-4015, v. 1, p. 525-534.

Squillace, P.J., and Thurman, E.M., 1992,

Herbicide transport in rivers--Importance of hydrology and geochemistry in nonpoint-source contamination: Environmental Science and Technology, v. 26, no. 3, p. 538-545, doi:10.1021/es00027a015.

Squillace, P.J., and Thurman, E.M., 1989,

Herbicide transport in the Cedar River, Iowa--Importance of hydrology and geochemistry in nonpoint-source contamination, in Mallard, G.E., and Ragone, S.E., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Phoenix, Arizona, September 26-30, 1988: U.S. Geological Survey Water-Resources Investigations Report 88-4220, p. 635.

Squillace, P.J., Thurman, E.M., Fischer, E.E., and Soenksen, P.J., 1991,

Source of atrazine, desethylatrazine, metolachlor in a selected reach of the Cedar River, Iowa, during base-flow conditions, in Mallard, G.E., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Monterey, California, March 11-15, 1991: U.S. Geological Survey Water-Resources Investigations Report 91-4034, p. 189-194.

Squillace, P.J., Thurman, E.M., and Furlong, E.T., 1993,

Groundwater as a nonpoint source of atrazine and deethylatrazine in a river during base flow conditions: Water Resources Research, v. 29, no. 6, p. 1719-1729, 93WR00290, doi:10.1029/93WR00290.

Stackelberg, P.E., 1996,

Evaluating the effect of land use and sampling depth on ground-water quality, Long Island, New York, in Morganwalp, D.W., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Colorado Springs, Colorado, September 20-24, 1993: U.S. Geological Survey Water-Resources Investigations Report 94-4015, v. 2, p. 1001-1010.

Stackelberg, P.E., and Eckhardt, D.A.V., 1996,

Modeling statist