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Additional Site Assessment Work Plan ACE TOMATO 2771 East French Camp Road, Manteca, California 1.0, INTRODUCTION At the request of Mr. Dean Janssen, Advanced Geo Environmental, Inc. (AGE) has prepared the enclosed work plan for 2771 East French Camp Road.Manteca.California(site).The scope of work includes the advancement of three soil borings for the collection of soil-vapor samples to evaluate the threat of hydrocarbon-impacted soil-vapor intrusion inside buildings located on the site. The location of the site is illustrated on Figure 1. A plan of the site is illustrated on Figure 2. The San Joaquin County Environmental Health Department (EHD) has directed the preparation of a work plan to assess the potential for vapor intrusion (hydrocarbon-impacted soil-vapor) inside buildings located on the site. This work plan is prepared in accordance with Central Valley Regional Water Quality Control Board(CVRWQCB)guidelines for the investigation of underground storage tanks (UST) sites. The work plan was prepared in accordance with the EIID directive letter dated 19 January 2007 (Appendix A). Analytical soil and ground water sample results are included in Tables 1 and 2, respectively. 2.0. BACKGROUND The site is located at 2771 East French Camp Road, Manteca, California, and is situated in an area of mixed commercial and agricultural use. The site is bordered by East French Camp Road to the south and agricultural land to the west, north and east. Prominent features on the site 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, asyrnmetric 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 Advanced GeoEnvironmental,Inc.