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Limited Subsurface Investigation Work Plan ARROYO'S SMOG SHOP 3012 East Waterloo Road, Stockton, California 1.0. INTRODUCTION At the request of Mr.Abelardo Arroyo,Advanced GeoEnvironmental,Inc. (AGE)has prepared this Limited Subsurface Investigation Work Plan for the property at 3012 East Waterloo Road,Stockton, California(the site). The work is being performed as part of a due diligence for a 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 subject property,located at 3012 East Waterloo Road in an unincorporated portion San Joaquin County, California, is situated in an area of mixed commercial/residential and light industrial use. Historical site usage research performed by AGE has indicated that the property was utilized as a gasoline service station for approximately 40 years. 2.1. PREVIOUS INVESTIGATIONS According to records on file with the SJCEHD, four underground storage tanks (USTs) were formerly located on the property. Three of the USTs were located in a common excavation,west of the on-site building; a fourth USTs, presumably used for waste oil, was located south(behind) the on-site building. In 1998,the four USTs were removed by Paydirt Excavation.The USTs had been out of commission and empty at the time of removal. Soil samples were collected from the UST excavation, former piping areas and dispenser island area. Petroleum hydrocarbons were not detected in soil samples collected at the time of removal. 2.2. REGIONAL GEOLOGIC/HYDROGEOLOGIC SETTING The site is situated within the southern portion of the Great Valley Geomorphic Province of California, a large, elongate, northwest trending, asymmetric structural trough; the northern and southern portions of the Province have been designated the Sacramento and San Joaquin Valleys, Advanced GeoEnvironmental,Inc.