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Preliminary Site Assessment Work Plan DELTA VALLEY TOWING(CALIFORNIA DEPOT) 1919 East Charter Way, Stockton, California 1.0. INTRODUCTION At the request of Mr. George Garcia of California Depot,Advanced GeoEnvironmental,Inc. (AGE) has prepared this Preliminary Site Assessment Work Plan for the property located at 1919 East Charter Way, Stockton, California(the site). The work is being performed as part of due diligence to determine the potential existence of hydrocarbon impacted soil and ground water at the site. 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 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 1919 East Charter Way in Stockton, California, and is situated in an area of mixed commercial and light industrial use. The site is currently utilized as a towing and vehicle storage facility. General property history has included residential use at the southeast corner from at least 1900 to present,a service station at the southwestern corner from at least 1960 through 1970 and general trucking and auto-related activities from 1978 to present. The 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 Advanced GwEnvironmental,Inc.