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Preliminary Site Assessment Work Plan Former CHEVRON PROPERTY 103 West Eleventh Street, California 1.0. INTRODUCTION At the request of Mr. Antony Vu, Advanced GeoEnvironmental, Inc. (AGE) has prepared this Preliminary Site Assessment Work Plan for the property located at 103 West Eleventh Street,Tracy, California(the site). The work is being performed as part of due diligence for a potential property transfer.The location of the site is illustrated on Figure 1.A plan of the site is illustrated on Figure 2. This work plan was prepared as required by the San Joaquin County Environmental Health Department(EHD)for the procurement of a soil boring permit,and is in accordance with Appendix A to Tri-Regional Recommendations -Reporting, dated 30 August 1991, prepared by the Central Valley Regional Water Quality Control Board for the investigation of underground storage tank (UST) sites 2.0. BACKGROUND The site is located in a business district of central Tracy, California. The site is situated at the intersection of West Eleventh Street and Adams Street, in an area of low topographic relief. The elevation at the site is approximately 18 feet above mean sea level(Figure 1).The prominent features on the subject property are depicted in Figure 2. 2.1. UNDERGROUND STORAGE TANK REMOVAL AND PREVIOUS INVESTIGATION The following information was obtained from review of public records for the subject property: • On 04 December 1991, Chevron completed and submitted an unauthorized release(UAR) for the subject property. On 08 January 1992, one waste oil UST was removed from the northern portion of the site; significant petroleum hydrocarbon impact to soil and ground water was reported. On 10 January 1992, the site was placed in San Joaquin County Environmental Health Department's (EHD)local oversight program(LOP) and a directive was issued for further site assessment. • On 08 and 09 July 1993, eight USTs were removed from the subject property: two 10,000 gallon gasoline USTs and one 5,000 gallon gasoline UST, all located in a common excavation. Five additional USTs of undocumented size and unknown petroleum product content were discovered and removed east of the initial excavation. Significant petroleum hydrocarbon contamination was encountered during the UST removals and the excavations were expanded to remove excess contaminated soil.Total petroleum hydrocarbons quantified Advanced GmEnvironmental,Inc.