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Interim Soil Remediation Work Plan Former TRACY DINER 95 West Eleventh Street, Tracy, California 1.0. INTRODUCTION At the request of Mr. Joe Panetta, Advanced GeoEnvironmental, Inc. (AGE) has prepared this Interim Soil Remediation Work Plan for the former Tracy Diner, 95 West 110' Street, Tracy, California. California. The scope of work includes overexcavation and sampling of contaminated soil encountered at the site as a result of the discovery of an Underground Storage Tank(UST). The objective of the work is to remove potential contaminant sources to the ground water. On the 21 October 2003 AGE discovered a previously unknown UST at the site south of the existing MW-2. Visible hydrocarbon staining was observed in the surrounding soil. This work plan has been prepared in accordance with the Regional Water Quality Control Board's Tri-Regional Board Staff Recommendations for Preliminary Evaluation and Investigation of Underground Tank Sites guidelines for the investigation of UST sites. 2.0. BACKGROUND The site is located at 95 West 11°Street,Tracy,California,in an area of commercial and residential use. The site is situated at the intersection of West Eleventh 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). Advanced GeoEnvironmenlal.Ine.