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p..i 1.0 INTRODUCTION �• This report is being submitted in anticipation of a request by the San Joaquin County Public Health Services r' Environmental Health Division for a subsurface investigation at the Gardner property, 26056 Thornton Road, Thornton, California (Figure 1). On September 6, 1989, three underground gasoline storage tanks were removed at the project site by Western Meter ' Service of Stockton, CA (Figure 2) . Soil samples were collected beneath each tank and the associated piping. The soil samples were analyzed for benzene, toluene, ethylbenzene, xylenes (STE%), total petroleum hydrocarbons as gasoline (TPHG), tetra ethyl. lead (TEL), and ethylene w dibromide (EDB), by California Water Labs utilizing appropriate EPA and DHS methodologies. The analytical results are summarized in section 2.5. The laboratory data sheets and chain-of-custody documentation from the tank removal are included in Appendix I. The presence of elevated conct:ntrations of petroleum hydrocarbons in the tank pit soil samples indicates further investigation will be required to determine the lateral and vertical extent of soil contamination at the project site. 2.0 BACKGROUND TECHNICAL DATA 2.1 Name and address of contact person: Contact Person: Mr. Al Horlett Wilson, Hoslett & Whitridge 504 Bank of Stockton Building 311 East Main Street ` Stockton, California 95202 2.2 Map showing site location, relative to nearby landmarks: The site location is shown on Figure 1. ky 2.3 Site plan € � A site plan is presented on Figure 2. i 2.4 Layout of all tanks and piping systems properly labeled for content: The former tank locations and existing pump island are plotted on Figure 2. 2.5 Preliminary soil data: Laboratory analysis of soil samples are summarized in Table i 1• 1