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r. <br /> s' <br /> RECEIVED <br /> Exxon Company,U.S.A. AUG 2 6 3991 <br /> QUARTERLY SUMMARY REPORT ENVIRONMENTAL HEALTH <br /> March-June 1991 PERMIT/SERVICES. <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(0389/91)RESULTS: TPH) Historical <br /> WellEthyl- <br /> Toluene benzene Xylenes Gasoline Trend <br /> ` No. Benzene Unchanged <br /> <0.3 <50 <br /> MWI <0.3 <0.3 �l �Op Unchanged <br /> MW2 <5 <43 <0.3 34 200 Unchanged <br /> 43 <br /> $ Unchanged <br /> MW] <0.3 <0.3 <0.3 <1 <50<50 Unchanged <br /> g <0.3 <0.:3 <0.3 <1 <br /> FREE PHASE PRODUCT RECOVERY SUMMARY' <br /> Free product recovered this quarter <br /> Not applicable <br /> Cumulative total product recovered <br /> 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 chemica]ly analyzed for TPH and <br /> BTEX. June 1991 <br /> WORK TO BE PERFORMED NEXT 12 MONTHS: <br /> of 7 <br /> Quarterly sampling and analysis will be continueii to monitor the decline of concentrations <br /> petroleum hydrocarbons in the groundwater. <br />