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1 i Phase II Site Assessment Work Plan HARRISON AUTO ELECTRIC 3245 North Wilson Way, Stockton, California 1.0. INTRODUCTION At the request of Mr. Don Morris,property owner,Advanced GeoEnvironmental,Inc. has prepared the enclosed Phase H Site Assessment Work Plan for the above-referenced site. The work is being performed as part of a due diligence for a property transfer. The work plan was prepared in accordance with San Joaquin County Environmental Health Department (SJCEHD) requirements for the procurement of a boring permit. The location of the site is illustrated on Figure 1. A plan of the site is illustrated on Figure 2. Where appropriate, this work plan 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 at 3245 North Wilson Way, Stockton, California and is situated in an area of mixed commercial and residential use.The site is located at the gore point of the iterseciton of North Wilson Way and Alpine Avenue. The property is presently occupied by Harrison Auto Electric, an automobile repair facility. Prominent features on the subject property are depicted in Figure 2. 2.1. 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, respectively. The Province is bordered by the Coast Ranges to the west,the Klamath Mountains and Cascade Range to the north, and the Sierra Nevada to the east. The Great Valley has been filled with sediments derived from both marine and continental sources. Thickness of the sedimentary fill ranges from thin veneers along the valley edges to more than 20,000 feet in the south central portion of the valley.The sedimentary formations range in age from Jurassic to Recent,with the older deposits being primarily marine in origin and the younger deposits being primarily continental. Continental-derived sediments were primarily deposited in lacustrine, fluvial,and alluvial environments with sediment sources being the mountain ranges surrounding the valley(Olmsted and Davis, 1961);the site itself is located on unconsolidated and semi-consolidated alluvium, lake, playa and terrace deposits of Quaternary age (California Division of Mines and Geology, 1977).Rocks composing the basement complex of the Province have not been completely defined but are believed to be metamorphic and igneous in origin.