Factors Affecting the Occurrence and Distribution of Pesticides in the Yakima River Basin, Washington, 2000

Scientific Investigations Report 2007–5180

U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2007–5180

Figure - refer to figure caption for alternative text description

Figure 8. Comparison of frequency of pesticide detections in July 2000 and estimates of pesticide applications during the 2000 growing season, Yakima River Basin, Washington. Frequencies were determined using pesticide concentrations screened at 0.02 µg/L (C, commonly detected below screening value; R, rarely detected below screening value; ND, not detected). Organic carbon-water partitioning coefficient (K_oc) values were obtained from the U.S. Department of Agriculture WIN-PST program (http://www.wsi.nrcs.usda.gov/products/W2Q/pest/winpst.html), accessed Sept. 24, 2007). K_oc values are reported in milliliters per gram.

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