Seasonal Variability and Effects of Stormflow on Concentrations Of
Seasonal Variability and Effects of Stormflow on Concentrations of Pesticides and their Degradates in Kisco River and Middle Branch Croton River Surface Water, Croton Reservoir System, New York, May 2000–February 2001 By Patrick J. Phillips1 and Robert W. Bode2 Samples from two streams in the Croton Reservoir system —Kisco River and the Middle Branch Croton River—were sampled 52 and 31 times, respectively, from May 2000 through February 2001. Samples from the Kisco River contained over 30 pesticides or pesticide degradates, and samples from Middle Branch Croton River contained over 20 pesticides or pesticide degradates. Many of the pesticides detected most commonly in this study are generally used in developed areas, and are frequently used on turfgrass. 1 U.S. Geological Survey 2 New York State Department of Environmental Conservation U.S. Department of the Interior Water-Resources Investigations Report 03–4151 U.S. Geological Survey December 2004; Revised January 2009 2 73º 52' 30" 45' 37' 30" 30' Seven herbicides (2,4-D, 2,4-D methyl ester, bromacil, dicamba, diuron, imazaquin, CT NY and sulfometuron), four insecticides (carbaryl, diazinon, imidacloprid, and malathion), two NEW YORK fungicides (metalaxyl and myclobutanil), Croton Basin and caffeine (an indicator of wastewater) New York City were detected in at least one sample from the E . B Kisco River at concentrations above 0.1 µg/L r a n (micrograms per liter). Four of these compounds M c 41º id h DUTCHESS COUNTY d —2,4-D, 2,4-D methyl ester, dicamba, and 30' l e C B r W o r t metalaxyl—were detected in at least one .
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