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Shallow GroundWater Quality
Analyses of GroundWater Quality Data
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Aldicarb ammonia aquifer atrazine Azinphos-methyl boron California California Department carbofuran central flood basins chloride Department of Water depth to ground detected in shallow Dissolved organic carbon dissolved solids dissolved-solids concentrations diuron Environmental Protection Agency exceeded geomorphic unit GMWL ground-water chemistry ground-water samples HAL1 human activities land surface manganese maximum contaminant level MCL1 meters mg/L U.S. Environmental milligrams milligrams per liter molinate molybdenum NAWQA Program nitrate nitrate concentration number of pesticides number of rice NWQL percent rank-sum test recharge redox redox condition relative standard deviations rice fields rice land-use study rice pesticides detected Sacramento River Sacramento River Basin Sacramento Valley Sacramento Valley aquifer shallow ground water shallow ground-water quality Simazine SMCL sodium Spearman rank correlation spectrometry stable isotopes statistical sulfate sulfide thiobencarb tritium U.S. Environmental Protection U.S. Geological Survey uS/cm USGS water chemistry water in rice water quality Water Resources water standard western alluvial plain