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AU8 2 6 1991 <br /> ENVIRONMENTAL HEAL VH <br /> Exxon Company, U.S.A. PERMIUSERVICES <br /> QUARTERLY SUMMARY REPORT - <br /> March- June 1991 <br /> Date: July 11,1991 <br /> RAS #7-3942 <br /> 4444 E. Pershing Ave <br /> Stockton,California <br /> EA PROJECT#: 10246.19 <br /> WORK PERFORMED THIS QUARTER: <br /> Applications for Waste Discharge and for an NPDES permit were submitted to the RWQCB. <br /> Application for discharge to the sanitary sewer was submitted. <br /> Groundwater was sampled on 2 May 1991, and the samples were analyzed for petroleum <br /> hydrocarbons, volatile organic compounds, major anions, priority metal pollutants, and <br /> oxygen demand. <br /> Samples of soil vapor were collected, and the samples were analyzed for organic lead to assess <br /> the impact on the catalyst bed of a catalytic converter. <br /> QUARTERLY GROUNDWATER SAMPLING (05/02/91)RESULTS: (ug/L) <br /> Well Ethyl- TPH Historical <br /> No. Benzene Toluene benzene Xylenes Gasoline Trend <br /> MW1 Not sampled- well was dry <br /> MW2 Not sampled - well was dry <br /> MW3 Not sampled - well was dry <br /> MW4 Not sampled - well was dry <br /> MW5 Not sampled - well was dry <br /> MW6 Not sampled - well was dry <br /> MW7 Not sampled - well was dry <br /> MWS 830 5,900 4,900 23,000 57,000 NA <br /> MW9 Not sampled- well was dry <br /> MW10 6,900 5,700 2,100 5,900 27,000 Decreased <br /> MW i l <0.3 <0.3 <0.3 <1 <50 NA <br /> MW12 <0.3 <0.3 <0.3 <1 <50 NA <br /> RWl 5,700 17,000 2,700 12,000 67,000 Increased <br /> RW2 1,600 3,400 1,600 7,900 32,000 Increased <br /> RW3 Not sampled - liquid-phase hydrocarbons <br />