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i V � Revised Preliminary Site Assessment Work Plan LATHROP GAS AND FOOD MART - 14800 South Highway 99, Manteca, California 1.0. INTRODUCTION At the request of Mr. David Atwater, of Fuel Stops Land and Development LLC, Advanced GeoEnvironmental, Inc. (AGE)has prepared this Revised Preliminary Site Assessment Work Plan for the property located at 14800 South Highway 99, Manteca, California (the site). The work is being performed to determine the potential existence ofhydrocarbon impacted soil and ground water at the site in the area of the upgraded fuel dispensers and piping.The location of the site is illustrated on Figure 1. A plan of the site is illustrated on Figure 2. This revision to the original work plan was prepared at the request of the San Joaquin County Environmental Health Department (EHD) by e-mail dated 17 October 2003, and is in accordance with Appendix A to Tri-Regional Recommendations -Reporting, dated 30 August 199 1, 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 14800 South Highway 99, Manteca, California, and is situated in an area of mixed commercial and agricultural use. The site is bordered by Highway 99 to the east, Lathrop Road on the south; Highway 99 Frontage Road on the west and the Lathrop Road off-ramp on the north. 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 Advanced GeoEnvlronmenul,Inc-