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aquifer in Carson Atrazine Basin and Range basin area Carson Desert agricultural Carson River Basin Carson Valley concen confining layers Covay Deethylatrazine Desert agricultural area drinking-water Equal-Area Conic projection exceeded the MCL Geological Survey digital Geological Survey Open-File Geological Survey Water-Resources ground-water quality ground-water samples hydrogen-isotope composition Hydrographic Area Lake Mead Lico and Seiler maximum contaminant level MBAS median concentration mg/L fig MTBE National Water-Quality Assessment Nevada Basin Nevada Division nitrate NVBR NAWQA study pCi/L percent percentile permil pesticides phenols precipitation previous study Lico principal aquifers Prometon radon Range NAWQA recharge Reno-Sparks area samples from principal samples from principal-aquifer samples from shallow shallow ground water shallow water-table aquifer Sierra Nevada Simazine SMCL sources Survey digital data Survey Open-File Report tetrachloroethylene tions treated sewage effluent triazine Trichloroethylene Truckee Meadows Truckee River Truckee River Basins U.S. Geological Survey ug/L Valley and Carson Vegas area Water in principal water quality Water Resources water samples Welch