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tta_ tvu . .gun <br /> I SW E.REMON7'STREET -3- 14 JUNE 1995 <br /> 5AN JOAQUIN COUNTY <br /> IR tQiJE5P FOR C1.0SU E <br /> County,to March 1995 (reports submitted July 1993 and March 1995). The nearby supply well <br /> locations were provided two years after Board staff requested the information. Additional <br /> monitoring wells were requested by the County in 1992 and in 1994,but[fie wells were never <br /> insiaUed. 'he lateral and Yertical extent of round watex coz3taaunation was never defined,but it <br /> i s reasonable to as that 211 <br /> tie source of con moved,the law leo s o� <br /> groundwater contatnulatrondissipate. However,County recoril.�indic.'t[c that.season r <br /> p o water as n trcumcn a cct(San Joaquin County Flood Control Map, 1986), <br /> and borings indicated residual benzene contamination of 104 parts per billion in hail at 41.5 feet <br /> and TPHd of 1.5 ppmat Oil feet. Should the geound water level rice res ual ben7zne <br /> concena ons eftin place eau d RUtcn ground water duality. <br /> The former-UST's contained leaded gasoline;bowevcr,no analyses for lead c;onr centrations in soil I <br /> and ground water were performed. Board staff recommends at least one round of ground'water <br /> sampling from the on-site well be analyzed for lead concentrations. <br /> SDJ <br />