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4' Bulk Transportation Page 2 Site Conceptual Model& CIosure Report GPE Project No. 606.3 LO August 28, 2009 2.0 SITE BACKGROUND V The following subsections describe the setting, geologic and hydrologic features of the site, and summarizes the history and status of the remedial investigation. 2.1 Site Setting The site consists of a single parcel of industrial-use land encompassing a total area of about 4 acres. It is situated on the east side of S. El Dorado Street at its intersection with Ivy Street. The site has been used for many years as a truck terminal. Hydrogeology As shown on the USGS topographic map, Stockton West Quadrangle (Figure 1), the site lies in the northern-most part of the San Joaquin Valley •• geomorphic province. The area is nearly flat lying, with little topographic variation, and a very gentle southwest slope. Locally, it lies about 13 feet above sea level. The site lies about 1,500 feet north of Walker Slough Y2 mile east of the San Joaquin River and slightly further south of the Stockton Deepwater Ship Channel. ` From groundwater monitoring data, at two nearby groundwater clean-up sites (Pacific Pride, 3147 S. El Dorado and CTL, 3105 S. El Dorado) the depth to first groundwater varies seasonally, but generally occurs at a depth of about 30 feet below the ground surface and flows generally towards the east. Soils & Geology Based on Page (1986), the geologic features of this portion of San Joaquin County are typical of California's Central Valley, a large northwest/southeast ... trending asymmetric trough bounded by mostly pre-Tertiary metamorphic, sedimentary and granitic rocks. Depth to basement rock in the Valley ranges up to at least 6 vertical miles in the southern portions of the Central Valley (the "San Joaquin" Valley), and to up to 10 miles in sediment thickness in the northern expanse of the valley (the "Sacramento" Valley). In most of San Joaquin County, with the exception of its eastern and western margins which are dominated by the foothills of the Sierra Nevada and Coast Ranges, respectively, recently (Cenozoic) deposited terrestrial, lacustrine, and marine sediments overlie older (pre-Tertiary in age) consolidated marine sediments. These older sedimentary units in turn overlie Mesozoic crystalline basement rocks. c. 2937 Veneman Ave.,#11240 Geo-Phase Environmental Inc. Phone (209) 569-0293 Modesto, CA 95356 Fax (209) 569-0293