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Chapter 2. Existing Conditions <br /> Information on existing site conditions was obtained primarily from the Austin Road Landfill <br /> Expansion draft environmental impact report (ETR) (Environmental Science Associates 1993) and <br /> from the delineation of waters of the United States on the project site (Jones & Stokes Associates <br /> 1995). <br /> SITE HISTORY AND LAND USE <br /> The existing landfill is within the jurisdiction of the City. All proposed project expansion <br /> areas are within the County of San Joaquin and zoned as agricultural with the provision for solid-waste <br /> facilities (Environmental Science Associates 1993). ,# <br /> TOPOGRAPHY, GEOLOGY, AND SOILS <br /> Topography <br /> Before development of the Austin Road Landfill, the project site was relatively flat and the <br /> lowest natural ground elevation was approximately 30 feet above msl. The main topographic features <br /> on the site are Littlejohns Creek, the landfill mounds, and the soil borrow pits. <br /> Geology <br /> The geology of the project site consists of sands, silts, and clays derived from weathered rock <br /> formations in the Sierra Nevada and deposited primarily by floodwaters of the Calaveras and <br /> Stanislaus River systems over the past 1.6 million years (Environmental Science Associates 1993). <br /> Soils <br /> Soils int project area are <br /> he roject mapped as Stockton clay and Jacktone clay (U.S. Soil <br /> pp <br /> Conservation Service 1992a). These soils, which are typically underlain by hardpan, have a high <br /> Welland Mitigation aad Monitoring Plan for the Chapter 2. Erishng Conditions <br /> Austin Road landfill Expansion. <br /> U.S.Army Corps of Engineers File 199400974 <br /> Croy of Stockton 2-1 April>. 1996 <br />