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25 November 2015 AGE Project No. 15-3594 Page 10 of 26 Historical uses of adjoining properties do not appear to be of environmental concern to the subject property. 3 . 2 . PHYSICAL SETTING SOURCES Geology The property is situated within the Great Valley Geomorphic Province of California , a large, elongate, northwest-trending , asymmetric structural trough . The Great Valley Province has been filled with thick sequences of sediment ranging in age from Jurassic to Recent, creating a nearly flat- lying alluvial plain that extends from the Tehachapi Mountains in the south to the Klammath Mountains in the north. Western and eastern boundaries of this province are comprised of the California Coast Range and the Sierra Nevada , respectively. Rocks composing the basement complex of the province have not been completely defined but are believed to be of metamorphic and igneous origins. Northern and southern portions of the Great Valley Province have been designated the Sacramento and San Joaquin Valleys, respectively. Hydrology Modesto , Riverbank, and Turlock Lake Formations and overlying Recent alluvium are the principal source of domestic groundwater in the 13 , 500- square-mile San Joaquin Valley Ground Water Basin (Basin 5-22) . The property and surrounding area are further located within the Eastern San Joaquin Subbasin (5-22.01 ) , which is bounded on the south , southwest, and west by the Modesto , Delta-Mendota , and Tracy Subbasins, respectively and on the northwest and north by the Solano , South American , and Cosumnes Subbasins. The Solano and South American are subbasins of the Sacramento Valley Groundwater Basin , The Eastern San Joaquin Subbasin is drained by the San Joaquin River and several of its major tributaries namely, the Stanislaus , and Calaveras , and Mokelumne Rivers. The San Joaquin River flows northward into the Sacramento and San Joaquin Delta and discharges into the San Francisco Bay. Based on information obtained from the State of California Geotracker Database, a site located approximately 50 south of the subject property (Granite Construction Facility, 10500 South Harlan Road , French Camp) , the groundwater is reported at a depth of approximately 24-31 feet below surface grade (bsg) and flowing in a northwesterly direction . Topography The property is located at an elevation of approximately 20 feet above mean sea level (MSL) , in an area of low topographic relief. Regional slope of the area is toward the general west-southwest. Surface Soils EDR provides a report listing dominant soil composition in the general area of the subject property based on information from the United States Department of Agriculture's Soil Conservation Service STATSGO (State Soil Geographic Database) soil maps. Soil surface texture at the subject property consists of soil identified as Tinnin , a loamy coarse sand in the Class A Hydrogeologic Group which includes high infiltration rates. Corrosion potential of this soil for uncoated steel is high . Advanced GeoEnvlronrnenlal, Inc.