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r 0 iPhase TI Site Assessment Work Plan Former TRACY DINER 95 West 11`a Street, Tracy, California 1.0 INTRODUCTION At the request of Mr Joe Panetta, Advanced Geo Environmental, Inc (AGE) has prepared this Additional Site Assessment Work Plan for the property at 95 West 11 to Street,Tracy,California(the site) The work is being performed as required by the San Joaquin County Environmental Health Department(SJCEHD) to assess hydrocarbon-impacted soil and ground water west of the subject site The location of the site is illustrated on Figure 1 A pian 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 95 West 1Ith Street in the city of Tracy, California The site is located in a busmess/agricultural area of central Tracy,California The site is situated at the intersection of West 11 O'Street and Adams Street, in an area of low topographic relief, at an elevation of approximately 18 feet above mean sea level(Figure 1), Tracy Quadrangle,7 5-Minute USGS Topographic Series, 1968, photo revised 1976 The prominent features on the subject property are depicted in Figure 2 2 1 REGIONAL GEOLOGIC/HYDROGEOLOGIC SETTING The site is located within the northern San Joaquin Valley which comprises part of the Great Valley geomorphic province of California The San Joaquin Valley is formed by the Great Valley geosyncline,which is a large, elongate, northwest-trending asymmetrical structural trough(basin) It 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 This trough has been filled with sediments derived from both marine and continental sources The thickness of the sedimentary fill ranges from thin veneers along the valley edges to greater than 20,000 feet in the south central portion of the valley The sedimentary formations range in age 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 sources being the mountain ranges surrounding the valley(Olmsted and Davis, 1961) The site is located on unconsolidated and semi- consolidated alluvium, lake, playa and terrace deposits of Quaternary age (California Division of . Mines and Geology, 1977) Adsvanced GeoEnvironmental,inc.