[en] During first quarter 1995, eleven constituents exceeded final Primary Drinking Water Standards (PDWS) in groundwater samples from downgradient monitoring wells at the mixed Waste Management Facility, the Old Burial Ground, the E-Area Vaults, the proposed Hazardous Waste/Mixed Waste Disposal Vaults, and the F-Area Sewage Sludge Application Site. No constituents exceeded final PDWS in samples from the upgradient monitoring wells during first quarter 1995. As in previous quarters, tritium and trichloroethylene were the most widespread elevated constituents. Antimony, chloroethene, copper, dichloromethane, gross alpha, lead, mercury, nonvolatile beta, and tetrachloroethylene also exceeded final PDWS in one or more wells. Elevated constituents were found in numerous Aquifer Zone IIB₂ (Water Table) and Aquifer Zone IIB₁ (Barnwell/McBean)wells. Elevated constituents were found in five Aquifer Unit IIA (Congaree) wells. The groundwater flow directions and rates in the three hydrostratigraphic units were similar to those of previous quarters