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Limited Subsurface Investigation PETE'S PLACE 9355 West Highway 4, Stockton, California 1.0. INTRODUCTION At the request of Temecula Valley Bank and Mr. Ayesh H. Ayesh,Advanced GeoEnvironmental, Inc. has prepared the enclosed Limited Subsurface Investigation Work Plan for site located at 9355 West Highway 4, Stockton, California (the site). The work is being performed as part of a due diligence for a property transaction. 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 (SJCEHD) 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 subject property, located at 9355 West Highway 4, San Joaquin County, California, is situated in an area of mixed commercial and light industrial use.Historical site usage research performed by AGE has indicated that the southeast portion of the site was occupied by a gasoline service station from approximately the 1950s until the early 1970s. 2.1. PREVIOUS INVESTIGATIONS It is our understanding that two underground storage tanks (USTs) were removed from the site in June 1991: one 12,000-gallon regular gasoline UST and one 8,000-gallon unleaded gasoline UST Groundwater was encountered during tank removal. The excavation was backfilled with the excavated soil. FGL Environmental Laboratories sampled both water and soil from the excavation. The samples were analyzed for total petroleum hydrocarbons(TPH-g),total lead,ethylene dibromide(EDB)and volatile aromatics (BTEX). TPH-g was detected in the water sample collected from beneath the 12,000-gallon tank at a concentration of 24 milligrams per liter(mg/l, parts per million). During the installation of a monitoring well at the site,petroleum hydrocarbon contamination was encountered in soil sample MW1-10, at 0.0054 mg/kg(parts per million). Groundwater collected from the well on the site did not indicate petroleum hydrocarbon contamination. Advanced GeoEnvironmental,Inc.