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Project Description —Report of Composting Site Information <br /> Tracy Material Recovery Facllrty and Transfer Station <br /> 30703 S. MacArthur Drive, Tracy, California 95377 <br /> P <br /> Table <br /> 4.' ,y <br /> Evaporation . <br /> Station Name Station# Year of Data Mean Maximum Minimum <br /> Tracy Pumping B90 900100 1953-1979 101.7' 17.6';July 1.5";Jan. <br /> plt <br /> Tracy B90 899600 1950-1954 70.8" 12.7";July 1.0"; Dec. <br /> Manteca B00 530300 1965-1979 69.3" 11.6';July 1.2'; Dec. <br /> Livermore E50 499600 1962-1979 72.8" 11.8"; July 1.6"; Dec. <br /> Sewage Plt <br /> Average 78.7" <br /> Geolo_gy <br /> This section of the report describes regional stratigraphy and structure, seismicity and site <br /> geologic conditions. The following discussion of regional and site geology is based r <br /> primarily on work presented in the Draft E1R prepared for the site (San Joaquin County, <br /> 1993), and a geotechnical investigation of the site performed by RGH Geotechnical and <br /> Environmental Consultants (RGH). The RGH(9993) study consisted of a surface and <br /> subsurface geologic investigation. <br /> Regional Geology <br /> The project site is located at the western margin of the Great Valley physiographic <br /> province on the eastern flank of the Diablo Range, south of Tracy. The valley is filled with <br /> Tertiary and Quaternary age clastic sediments to depths of greater than 20,000 feet. <br /> Streams flowing northeastward from the Diablo Range have deposited a succession of <br /> lobate-shaped alluvial fans at the base of the mountains. Reworked sediments derived <br /> from older alluvial fans are deposited as the San Luis Ranch Alluvium and the Los Banos <br /> alluvium at the mouth of Corral Hollow Creek, Lone Tree Creek, Hospital Creek and others <br /> (see Figure 5, Regional Geologic Map). A thin veneer of Holocene-aged Patterson <br /> Alluvium overlies these alluvial fans deposits. The alluvial fan sequence consists of <br /> discontinuous layers of gravel, sand, silt and clay which overlies a thick sequence of <br /> Tertiary and Quaternary age clastic sediments of the Tulare Formation (Wagner, et al., <br /> 9990). •The Tulare Formation is exposed in a thin band in the lower foothills of the Diablo <br /> Range to the west of the project and dips steeply northeastward into the valley. The <br /> Tulare Formation dips on the order of 15 to 20 degrees at its outcrop area, but flattens and <br /> thickens in the vicinity of Tracy. In the Tracy-Patterson area, the Tulare Formation ranges <br /> in thickness to 1,900 feet. <br /> 7 <br /> Edgar&Associates,Inc. Tracy Compost Fac ProjDesc042310 <br />