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10 November 1999 <br /> AGE-NC Project No 98-0450 <br />' Page 4 of 4 <br /> ' 40 DISCUSSION AND CONCLUSIONS <br /> Based upon data collected during the August 1999 quarterly monitoring event, AGE concludes <br /> ' • Ground water on the site was flowing toward the southwest from the former UST area and <br /> overall flowing to the south <br /> • The greatest concentration of dissolved hydrocarbons continues to be in the area of well <br /> BMW-4 located in the former UST location <br /> • MTBE was detected ib ground water wells sample from all well and at concentrations <br /> exceeding the State of California Action Limit of 4 ,ug/l in samples from three wells MTBE <br /> was encountered in ground water samples at concentrations ranging up to 420 ,ug/l (MW-5) <br /> by EPA 8260 Modified <br /> • The concentrations of benzene exceed the state maximum contaminant level (MCL) of 1 ppb <br /> ' in wells BMW-1, BMW-2, BMW-3, BMW-4 and MW-5 <br /> • The plume of impacted ground water with benzene concentrations above 50 /'�g/l lies <br /> between the foimer dispenser islands south of the former UST pit, and northeast of the <br /> former UST pit by well BMW-3 <br /> 50 RECOMMENDATIONS <br /> ' Based upon data collected from the site, AGE recommends <br /> ' • Continue quarterly monitoring and sampling The next monitoring event should be scheduled <br /> for late December 1999 <br /> • Upon approval of the Corrective Action Plan (CAP) by the PHS-EHD, initiate corrective <br /> action <br /> ' <br /> 60 LIMITATIONS <br /> =Our professional services were performed using that degree of care and skill ordinaiily exercised by - — <br /> cnviionmental consultants practicing In this or similar localities The findings were based upon <br /> ' analytical results provided by an independent laboratory Evaluations of the geologic/hydrogeologic <br /> conditions at the site for the purpose of this investigation aie made fiom a limited number of <br /> available data points (i e monitoring wells) and subsuiface conditions may N ary away from these <br /> data points No other warranty, expressed or implied, is made as to the professional <br /> recommendations contained in this report <br /> Atli anced GcoEm ironmcntal,Inc <br />