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A <br />.7 <br />Information on existing site conditions was obtained primarily from the Austin Road Landfill <br />Expansion draft environmental impact report (EIR) (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 />:i rNIZEIRM <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 />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. Ibe main topographic features <br />on the site are Littlejohns Creek, the landfill mounds, and the soil borrow pits - <br />DT -71 <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 />0 soils <br />Soils in the project area are mapped as Stockton clay and Jacktone clay (U.S. Soil <br />Conservation Service 1992a). These soils, which are typically underlain by hardpan, have a high <br />Weiland Mitigation and Monitoring Plan for the Chapter 2. basting Conditions <br />Austin Road landfill Expansion. <br />U. S. Army Corps of Engineers File 1994W974 2-1 April S. 19% <br />Cin of Stockton <br />