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L `` L SITE INVESTIGATION REPORT L Di Salvo Track Lines 100 Ventura Avenue LStockton, California San Joaquin County L Prepared by CONDOR EARTH TECHNOLOGIES, INC. L March 9, 1995 i L 1.0 INTRODUCTION �, Condor Earth Technologies, Inc., (Condor) conducted an initial site investigation on January 19, 1995, at the Di Salvo Truck Lines property located at 100 Ventura Avenue in Stockton, California. i The site is located near the Port of Stockton, as shown in Figure 1, Appendix A. The purpose of the work was to investigate the lateral and vertical extent of soil contamination and assess the groundwater conditions near the location of two former diesel underground storage tanks (USTs) at the site. The location of the former tanks is shown in Figure 2, Appendix A. This report includes a brief site Lhistory, a description of the field procedures used during the investigation, a discussion of the results of laboratory analyses, and Condor's recommendations. Condor conducted this work at the request of L Mr. Keith Tallia of Oil Equipment Service (OES). L 2.0 SITE BACKGROUND In October, 1987, OES removed one 5,000-gallon diesel UST (TKI) from the Di Salvo site. A representative from the San Joaquin County Public Health Services, Environmental Health L Department (SJCPHS,EHD) was on site to select the sample location from beneath TKI and the j required laboratory analyses. A representative from Kleinfelder and Associates(Kleinfelder) was on L site to collect the soil sample. One soil sample was collected from beneath the fill, or south end, of LTKI at a depth of approximately 15 feet below the ground surface. Laboratory analyses detected 130 mg/kg diesel in the soil sample. No other petroleum hydrocarbons were detected at the reported laboratory detection limits. L 4 LLJ CONDOR