Herbicide concentrations in and loads transported by the Conestoga River and Pequea Creek, Lancaster County, Pennsylvania, 1992-95
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agrichemicals aldrin base-flow periods Bureau of Laboratories carbonate rock chlordane collected during periods collected from Mill Computation of Loads compute loads concentration and streamflow Concentrations of atrazine concentrations of herbicides Conestoga River Basin constituent concentration Creek at Elshelman Creek at Martic cyanazine dieldrin duplicate samples Elshelman Mill Road four streams growing season herbicide concentrations hydrograph subdivision June 26 Lancaster County large number Little Conestoga Creek loads computed Loads of alachlor Loads of atrazine Loads Transported malathion Martic Forge May-Sept metolachlor Mill Creek Basin MVUE model NAWQA project nonstorms number of samples October through April PaDEP Bureau PaDEP Laboratory Pennsylvania Department Pequea Creek Basin periods of stormflow propazine quality-assurance relation between concentration reporting limit River and Pequea Road near Lyndon row crops RPD's samples collected samples were collected September simazine spike sample square kilometer square mile stormflow samples storms that occurred streamflow-gaging station Susquehanna River toxaphene U.S. Geological Survey Ug/L