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5.. -W Additional Site Assessment Work Plan SWIFT ROOFING 1930 West Fremont Street, Stockton, California 1.0. INTRODUCTION At the request of Ms. Marge Comer, Advanced GeoEnvironmental, Inc. (AGE) has prepared this Additional Site Assessment Work Plan for the property located at 1930 West Fremont Street. Stockton, California (the site). The scope of work includes the advancement of one Cone Penetrometer Testing (CPT) soil boring, followed by the installation of three ground water monitoring wells. The location of the site is illustrated o Figure 1. A plan of the site is illustrated on Figure 2. This work plan is prepared as required by the San,loaquin County Environmental Health Department (EHD) by a letter dated 13 September 2007, and in accordance with the Central Valley Regional Water Quality Control Board (CVRWQCB) guidelines for the subsurface investigation of underground storage tank (UST) sites. 2.0. BACKGROUND The site is located in the southwestern portion of the City of Stockton, San Joaquin County, on the south side of West Fremont Street, west from the intersection of West Fremont Street and San Juan Avenue, and immediately south of Interstate 5. 2.1. REGIONAL GEOLOGIC/HYDROGEOLOGIC CONDITIONS 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 Klarnath 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 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 GeoEnviranmental,Inc.