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Arm <br /> Exxo;, Company, U.S.A. <br /> QUARTERLY SUMMARY REPORT <br /> June-September 1991 <br /> Date: 11 October, 1991 <br /> RAS #7-1050 <br /> 909 Hammer Lane <br /> Stockton,California <br /> WORK PERFORMED THIS QUARTER: <br /> On 16 September 1991, groundwater from five of eight groundwater monitoring wells was <br /> sampled,and the samples were analyzed for petroleum hydrocarbons. <br /> A vapor extraction system has been op_rating at the site to remediate soils in the former tank <br /> field. <br /> QUARTERLY GROUNDWATER SAMPLING(09116191)RESULTS: (ug(L) <br /> Well Ethyl- TPH Historical <br /> We <br /> WelBenzene Toluene benzene Xylenes Gasoline Trend <br /> No.MWI. <0.5 <0.5 <0.5 <0.5 <50 Unchanged <br /> MW2 <0.5 <0.5 c9.5 <0.5 <50 Unchanged <br /> MWb <0,5 <0.5 <0.5 <0.5 <50 Unchanged <br /> MW7 <0.5 <0.5 <0.5 <0.5 <50 Unchanged <br /> MW8 <0.5 <0.5 <0.5 <0.5 <50 Unchanged <br /> FREE PRASE PRODUCT RECOVERY SUMMARY: <br /> Free product recovered this qu,arter: Not applicable <br /> Cumuladve total product recovered: Not applicable <br /> WORK TO BE PERFORMED NEXT QUARTER: <br /> 1) The vapor extraction and treatment will continue. <br /> 2) Groundwater will be sampled,and the samples will be chemically analyzed for TPF and <br /> BTEX. December 1991 <br /> WC-aK TO BE PERFORMED NEXT 12 MONTHS: - _ - -- <br /> Quarterly sampling and a n thewillbentnued to monitor the decline of concentrations of <br /> petroleum hydrocar groundwater. <br /> i <br /> 1 <br />