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13 February 2006 <br /> Appendix A - Site Background <br /> Page 3 of 4 <br /> REGIONAL GEOLOGICAL/HYDROGEOLOGICAL SETTING <br /> The site is situated within the Great Valley Geomorphic Province of California, a large, elongate <br /> northwest tending, asymmetric structural trough The Great Valley Province has been filled with <br /> thick sequences of sediment ranging in age from Jurassic to Recent, creating a nearly flat lying <br /> alluvial plain extending from the Tehachapi Mountains in the south to the Klamath Mountains in <br /> the north The western and eastern boundaries of this province are comprised of the California Coast <br /> Range and the Sierra Nevada,respectively Rocks composing the basement complex of the province <br /> have not been completely defined but are believed to be of metamorphic and igneous origin The <br /> Great Valley Province has been subdivided into two mayor divisions identified as the Sacramento <br /> and San Joaquin Valleys <br /> The Modesto, Riverbank and Turlock Lake Formations and overlying Recent alluvium are the <br /> principal sources of domestic ground water in the 13,500-square mile San Joaquin Valley Ground <br /> Water Basin (Basin 5-22) This basin is drained primarily by the San Joaquin River <br /> The closest surface water feature to the site is the Stanislaus River located approximately 9,000 feet <br /> south of the site The river is used primarily for domestic and agricultural uses and recreational <br /> . boating <br /> LOCAL GROUND WATER SETTING <br /> Groundwater is currently encountered at a depth of approximately 28 feet below surface grade(bsg) <br /> at the site and has a north to northwesterly flow direction Ground water occurs in a generally sandy <br /> layer extending relatively horizontal and somewhat continuous over the site <br /> i <br /> Advanced GeoEnvironmental,Inc <br />