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KLEIN FEL DER 2 SITE SETTING 2.1 SITE LOCATION The site is approximately located in the southeast quarter of Section 25, Township 1 South, Range 6 East of the Mount Diablo Baseline and Meridian According to the 1987 photorevised US Geological Survey "Lathrop, California," 7 5-Minute Topographic Quadrangle Map, the property has an elevation between 20 to 25 feet above mean sea level The site is part of Manteca Unified School District property located lust west of Manteca The site is located approximately 1500 feet north of Louise Avenue between Airport Way and the Union Pacific Railroad (Plate 1) 2.2 CURRENT SITE USE AND VICINITY CHARACTERISTICS The project site is located north of the MUSD office and maintenance yard in the vicimty of a farmhouse and associated structures The surrounding areas include commercial development and rural residential housing and farmhouses To the west of the project site is the former ' Permanente Metals facility which manufactured flares for the U S military during World War II That site has also had other industrial/commercial uses 2 3. REGIONAL GEOLOGY AND HYDROGEOLOGY The site lies within the Great Valley Geomorphic Province of California The valley is approximately 400 miles long and averages about 50 miles wide, and comprises about 20,000 square miles The valley is divided into the Sacramento Valley (northern half) and the San Joaquin Valley (southern half) The valley has been filled with a thick sequence of marine and non-marine 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 The valley deposits are derived from the Coast Ranges to the west and the Sierra Nevada to the ' cast 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 The project site is located in the southern San Joaquin County, which is within the northern portion of the San Joaquin Valley The area is characterized by unconsolidated alluvial deposits (channel and riverbank deposits) of the Stanislaus and San Joaquin Rivers and their many tributaries 20-1311-40 E0112019R039 Page 2 of 13 pc 1999,Kicinfelder,Inc January 20, 1999