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March 10,2003 NOA Environmental Project Number:LE03-063 Page 6 1.a General Site GeoloQv The subject parcel is located in the Sacramento/San Joaquin Valley. This valley is generally identified as the Great Valley geomorphic province. There are eleven geomorphic provinces in California,each representing distinctly different geologic environments. A description of the Great Valley Province from the California Division of Mines and Geology(1999) describes the Great Valley Province as... "an alluvial plain, about 50 miles wide and 400 miles long, located between the Coast Ranges and the Sierra Nevada. The Great Valley is drained by the i r Sacramento and San Joaquin Rivers which join and enter the San Francisco Bay. The eastern border is the west-sloping Sierran Bedrock surface, which continued westward beneath alluvium and older sediments The western border is underlain La by east-dipping Cretaceous'and Cenozoic'strata that form deeply buried synclinal" trough, lying beneath the Great Valley along its western side." Ld According to the USGS Open File Report'OFR 79-933,the site is the upper member ofthe Modesto Formation of Pleistocene age, consisting of arkosic alluvium. The alluvium contains sand, silt, and clay mixtures deposited by the Molelunme River Fan. General Soil Information V The subject parcel is generally located on soils identified as Kingdon fine sandy loam, 0 to 2 percent slopes, and Tokay,fine sandy loam, 0 to 2 percent slopes, by the US Department of Agriculture - (USDA), Soil Conservation Service, Soil Survey of San Joaquin County, California (1992). The �' following is an excerpted description of these soil units by the USDA Soil Conservation Service: La Kingdon fine sandy loam: This very deep, moderately well drained, nearly level soil in on low fan terraces. It formed in alluvium derived from granite rock sources.. Typically, the upper 5 inches of the surface layer is brown fine sandy loam. The Ld lower nine inches is grayish brown and brown fine sandy loam. The lower 14 inches is pale brown and brown loam and fine sandy loam. The substratum to a depth of 61 inches is pale brown and light gray fine sandy loam and sandy loam. In some L.8 ' About 65 to 136 million years ago 2 About 0 to 65 million years ago 3 V-shaped 4 Marchard,D.E.,and Atwater,$.F., 1979,Preliminary Geologic Map Showing Quarternary Deposits of the Lodi Quadrangle,California:U.S.Geological Survey Open File Report OFR 79-933,scale 1:62,500.