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' PROVINCIAL SETTING: According to the California Geological Survey,the subject property is located within the Great Valley geomorphic provinces. The Great Valley, originally a a trough in which sediments have been deposited almost continuously since the Jurassic(about 160 million years ago),is now an alluvial plain about 50 miles wide and 400 miles long. Its northern part is the Sacramento Valley, drained by the Sacramento River. It is in this valley that the subject property is located. Its southern part is the San Joaquin Valley drained by the San Joaquin River. Great oil fields have been found in southernmost San Joaquin Valley and along anticlinal uplifts on its southwestern margin. In the Sacramento Valley, the Sutter Buttes, the remnants of an isolated Pliocene volcano,rise above the valley floor. ' SOILS: The"Soil Survey of San Joaquin County,Califon-da"'describes the soils underlying the t subject property as the "Tokay-Urban land complex'. According to the NRCS descriptions,this complex is comprised of 50% Tokay fine sandy loam, and 35% urban land. The remaining 15% are comprised of small areas of Columbia, Devries,Tujunga, ' and Acampo soils that have been altered and intermixed by construction activities. Urban land is described as"areas covered by roads,driveways,sidewalks,parking lots, buildings, and other structures"! Tokay soils are described as "sandy loam" and are relatively deep and well drained, having formed mainly from granitic rock sources. Permeabilty is noted in the soil survey as moderately rapid. ' GROUNDWATER: Data from the California Department of Water Resources'indicates that groundwater is at a depth of about 50 feet below the ground surface in the vicinity of the subject property. The groundwater gradient is toward the southwest,away from the Mokelumne River. s California Geological Survey,2002.California Geomorphic Provinces-CGS Note 36. 'Soil Survey of San Joaquin County,Cahfomia,United States Department of Agriculture,Natural Resources Conservation Service(undated) ' 7 Soil Survey of San Joaquin County,California,United States Department of Agriculture,Natural Resources Conservation Service(undated),pp 129 ' lhttp://well.water.ca.gov/gw/gw_data/hyd/Rpt_Hist_Data5—gw.wellNumber 03N07E06Q004M ' RNC Environmental,LLC • 9746 Parktree Way,Elk Grove,CA 95624 • 916.714.3073 • fax 916.290.0106