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Phase II Site Assessment Work Plan WRENCHER'S 540 North Grant Street, Stockton, California 1.0. INTRODUCTION At the request of Mr. Barry Vlught, Advanced GeoEnvironmental, Inc. (AGE) has prepared this Phase II Site Assessment Work Plan for the property at 540 North Grant Street,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 site, located at 540 North Grant Street in the city of Stockton, California,is situated in an area of mixed commercial and light industrial use. The site encompasses a city block,bordered by East Oak Street on the north,North Aurora Street on the east,East Fremont Street on the south and North Grant Street on the west.This city-block site,referred to as Wrencher's,rents space to an auto supply shop and various auto repair,body and towing shops.The prominent features on the subj ect 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(Ohnsted and Davis, 1961);the site itself is located on unconsolidated and semi-consolidated Advanced GmEnvironmental,Inc.