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k9 KLEINFELDER 4.3. PHYSICAL SETTING SOURCE(S) Table 7 presents information about the physical setting of the site. This information r was obtained from published maps. TABLE 7 PHYSICAL SETTING The elevation of the site ranges from approximately 75 to 85 feet above mean sea level (msl). The site is State of California Department depicted as vacant land with a north/south trending road USGS of Water Resources. Avena, leading to 10 structures in the center of the site. Lone TOPOGRAPHIC Quadrangle, 15 Minute Series, Tree Creek trends approximately east/west through the QUADRANGLE 1952 photorevised 1968. center of the site. A pond is located on the eastern Scale: 1 inch = 2,000 feet. portion of the site near the creek. Two wells are located onsite, one along the eastern boundary, and one along _ the northern. Irrigation canals trend through the site. Regional Geologic Map Series, GEOLOGIC San Francisco-San Jose The subject site and the adjacent properties are shown MAP Quadrangle, Map No. 5A, as members of the Modesto Formation and the 1991,; Scale: 1 inch = 3.95 Riverbank Formation. miles Onsite soil is listed as Madera sandy loam, Madera- Alamo complex, and Veritas fine sandy loam. These SOIL TYPE Soil Survey of San Joaquin soils are 0 to 2 percent slopes and are moderately well County, 1992. drained to poorly drained. Permeability ranges from slow to moderately rapid and available water capacity is low to moderate. OIL AND GAS ftp://ftp.consrv.ca.gov/pub/oil/m According to the website, no gas or oil wells are FIELDS aps/dist5/W5-3/MapW5-3.pdf associated with the site. Information about the regional geology is presented on Table 8. This information was obtained from published data and maps, interviews with public agencies, and/or from previous investigations conducted by Kleinfelder in the vicinity of the site. TABLE 8 REGIONAL GEOLOGY The site is in the central part of the Great Valley Geomorphic Province of California. The valley is 400 miles long, 50 miles wide, and comprises approximately 20,000 square miles. The valley has been filled with a thick sequence of marine and nonmarine sediments from the late Jurassic to Holocene. The uppermost strata of the Great Valley represents, for the most part, the alluvial, flood, and delta plains of two major rivers (Sacramento and San Joaquin Rivers) and their tributaries. REGIONAL GEOLOGY The valley deposits are derived from the Coast Ranges to the west and the Sierra Nevada to the east. Granitic and metamorphic rocks outcrop along the eastern and southeastern flanks of the valley. Marine sedimentary rocks outcrop along most of the western, southwestern, southern, and southeastern flanks; and volcanic rocks and deposits outcrop along the northeastern flanks of the valley. The valley geomorphology includes dissected uplands, low alluvial plains and fans, river flood plains and channels, and overflow lands and lake bottoms. 67453.P01/ST06R715/RB:Iv Page 12 of 37 ©2006 Kleinfelder, Inc. July 6,2006