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Preliminary Site Assessment Work Plan ISLAMIC CENTER OF STOCKTON 1130 South Pilgrim Street, Stockton,California 1.0. INTRODUCTION Advanced GeoEnvironmental,Inc.(AGE)has prepared this Preliminary Site Assessment Work Plan for the property located at 1130 South Pilgrim Street,Stockton,California(site).The proposed work will be performed to assess the vertical extent of petroleum hydrocarbon-impacted soil and potential hydrocarbon impact to ground water at the site, in the area of the former underground storage tank (UST). The location of the site is illustrated on Figure 1. A plan of the site, including existing structures and the location of the former UST, is illustrated on Figure 2. This work plan was prepared at the request of the San Joaquin County Environmental Health Department(EHD)by letter dated 06 October 2004, and is in accordance with guidelines issued by the Central Valley Regional Water Quality Control Board(CVRWQCB)forthe investigation of UST sites. 2.0. BACKGROUND The site is located at 1130 South Pilgrim Street, Stockton, California, and is situated in an area of mixed commercial and industrial use.The site is bordered by South Pilgrim Street to the west,South Airport Way to the east, East Jackson Street to the south, and East Anderson Street to the north. 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, continental. Continental-derived sediments were typically 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 Geology, 1977).Rocks composing the basement complex of the Province have not been completely defined,but are believed to be metamorphic and igneous in origin. Advanced GeoEnvironmental,Inc.