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42 wells sampled Acetochlor Alachlor analysis anthropogenic apparent recharge date aquifer areas in northern atrazine bedrock aquifers Carbon Disulfide chloroform correlated significantly deethylatrazine deethyldeisopropylatrazine deisopropylatrazine Dichlorodifluoromethane different VOCs Diisopropyl Ether dissolved oxygen domestic-supply Equal-Area Conic projection Ethane Sulfonic Acid ground water hydroxyatrazine ig/L Illinois River Basin information-rich method levels information-rich method reporting laboratory reporting levels List of pesticide method reporting levels Methyl Tert-Butyl Ether metolachlor Metolachlor Ethane Sulfonic mg/L micrograms per liter Monitoring Total MTBE Nitrate concentrations NITRATE DETECTED northern Illinois/southern Wisconsin Number of detections pesticide and pesticide pesticide concentrations pesticide detected pesticide transformation products prometon reporting level LRL Spearman Rank Correlation Standard parallels 33 study area total pesticide transformation product detections Trichloromethane Triclopyr tritium U.S. Environmental Protection U.S. Geological Survey upper Illinois River urbanized areas USGS VOC detections VOC or pesticide VOCs were detected volatile organic compounds water from urbanized Water samples