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June 25, 1992 RAW ARCO Service Station No. 2076, Lodi, California WA% Results of the bioassay analysis indicated no fathead minnow died and concentrations of total chromium, nickel, and zinc were below the Total Threshold Limit Concentration outlined in Title 22, California Code of Regulations, Section 6626124. RESNA obtained authorization from the SJCPHS-EHD for Golden West to backfill the former tank cavity with the stockpiled soil TANK INSTALLATION AND BACKFILLING On November 22, 1991, RESNA forwarded analytical results of soil samples collected from the new tank cavity to the SJCPHS-EHD and requested authorization for ARCO's contractors to install the new tanks in the tank cavity east of the station building Verbal authorization was received from Ms. Letitia Resch on November 22, 1991 On December 2, 1991, RESNA forwarded results of soil samples collected from the former tank cavity In our letter of December 5, 1991 to the SJCPHS-EHD, RESNA forwarded results of soil samples collected from the product-line trenches and a diagram showing our plan to install subgrade piping for use in a future remediation system (Plates 4 and 5) We i requested authorization from ARCO to leave soil with residual hydrocarbons in place under the former product lines, for the contractor to install new product lines at the site, and for RESNA engineers to install subgrade components (4-inch-diameter polyvinyl chloride piping) next to the new product lines for use in a future vapor-extraction system The work was conducted the week of December 16, 1991 On December 11, 1991, Mr Steve Schneider of the SJCPHS-EHD verbally authorized disposal of soil from the new tank cavity to private land owned by Mr. Harvey Birndt located at 2050 Victor Road in Lodi, California Golden West previously arranged disposal of soil at this location at the request of ARCO. • 4M-3 7