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z Ms. Mary Meays Page 3 July 15, 1991 Benzene,Tolucne, Ethylbenzenes and Xylenes (BTE&X) -- EPA Method 8020;and Organic lead -- DHS-specified Method. Analytical Results The findings from the laboratory testing of soil and ground water samples are summarized in Table 2. Laboratory reports and chain-of-custody forms are attached. Analyses of the soil samples collected from the borings for wells MW-4 and MW-5 indicated that petroleum hydrocarbons (identified as gasoline) were present in the soil. BTX&E compounds were also detected in soil samples from well MW-5. Analyses of water samples from wells MW-4 and MW-5 indicated that similar compounds (petroleum hydrocarbons identified as gasoline and certain BTEX compounds) are present in the groundwater. The highest concentrations are present directly under the location of the former tank. Figure 1 depicts the maximum probable extent of petroleum products in the ground water. Emblemn rno � A Problem Assessment Report(PAR) was requested by San Joaquin County in a letter dated April 5, 1991. Phone contact with Ms. Diane Hinson of the i County(June 6, 1991)was followed by a letter dated June 12, 1991 requesting a time extension for the PAR. The reason for this request was that the results from two additional underground storage tank removals (at 1325 and 1541 West Weber Avenue, respectively)are to be included in the report. The County granted a time extension until September 15, 1991. Interim Remedial Measurers ERM-West, Inc., on behalf of Catellus Development Corporation,is currently considering several possible interim remedial measures for the site. The selected interim measuic will be targeted at both preventing a deterioration in site conditions and short-term remediation, pending _- completion and acceptance of the PAR.