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.I. <br /> Exxon Company, U.S.A. <br /> QUARTERLY SUMMARY REPORT - <br /> March-June 1991 <br /> Date: July 11, 1991 <br /> RAS #7-1050 <br /> 909 Hammer Lane <br /> Stockton,California <br /> WORK PERFORMED THIS QUARTER: <br /> On 29 March 1991, samples were collected from five of eight groundwater monitoring wells <br /> on the site. <br /> A vapor extraction system has been operating at the site to remediate soils in the former tank <br /> field. <br /> QUARTERLY GROUNDWATER SAMPLING(03/29/91)RESULTS: (ug/L) <br /> Well Ethyl- TPH Historical <br /> No. Benzene Toluene benzene Xylenes Gasoline Trend <br /> MW 1 <0.3 <0.3 <0.3 <1 <50 Unchanged <br /> MW2 <0.3 <0.3 <0.3 <1 X500 Unchanged <br /> MW6 5 43 5 34 200 Unchanged <br /> MW7 <0.3 <0.3 <0.3 <1 <50 Unchanged <br /> MW8 <0.3 <0.3 <0.3 <1 <50 Unchanged <br /> FREE PHASE PRODUCT RECOVERY SUMMARY: <br /> Free product recovered this quarter. Not applicable <br /> Cumulative 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 TPH and <br /> _ BTEY <br /> June 1991 <br /> WORK TO BE PERFORMED NEXT 12 MONTHS: <br /> Quarterly sampling and analysis will be continued to monitor the decline of concentrations of <br /> petroleum hydrocarbons in the groundwater. <br />