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ii <br /> Project Description — Report of Composting Site Information <br /> Tracy Material Recovery Facility and Transfer Station <br /> 30703 S. MacArthur Drive, Tracy, California 95377 I <br /> Table I <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 /> Pit <br /> Tracy B90 899600 1950-1954 70.8" 12.7'; July 1.0"; Dec. <br /> ;I <br /> Manteca B00 530300 1965-1979 69.3" 11.6";July 1.2"; Dec. <br /> Livermore E50499600 1962-1979 72.8" 11.8'; July 1.6"; Dec. ' <br /> Sewage Plt <br /> f Average 78.7" i <br /> Geology <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' <br /> primarily on work presented in the Draft EIR prepared for the site (San Joaquin County, <br /> L/ 9993 and a geotechnical investigation of the site}, g g to performed by RGH Geotechnical{and <br /> Environmental Consultants (RGH). The RGH(1993) 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 a1., <br /> 1990 . The Tulare Formation is exposed in a thin band in h 1 <br /> } p the ower 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 flatten, s and <br /> thickens in the vicinity of Tracy. In the Tracy-Patterson area, the Tulare Formation ranges <br /> in thickness to 1,100 feet. <br /> a <br /> 7 s <br /> Edgar&Associates,Inc. Tracy Compost Fac Proj0esc121907 <br /> f <br /> �f <br />