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A working group of Agricultural Research Service scientists are studying the fate of two chlorinated hydrocarbon pesticides (Dieldrin and Heptachlor) applied in the surface of a small watershed at the North Appalachian Experimental Watershed near Coshocton, Ohio. Runoff and sediment transport are sampled as they occur and periodic measurements are being made of the material carried from the treated area in vapor form. Corn samples will be analyzed for Dieldrin and Heptachlor uptake, and soil samples will be examined to determine the amount of pesticide remaining in the soil at the end of each growing season. Evapotranspiration data from an adjacent weighing iysimeter and intensive micro-climate sensing equipment are used in an evaluation of the air transport phase of a complete Dieldrin and Heptachlor budget.