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t <br /> GRANITE CONSTRUCTION— FRENCH CAMP Page 2 <br /> WKA No 2088 09 <br /> October 10, 2005 <br /> Site Description <br /> The site comprises approximately 20 acres located easterly of Harlan Road, south of French <br /> Camp, California Granite Construction Company owns and operates an asphalt batch plant at <br /> this location The site consists of an office, shop area, fuel storage areas, asphalt batch plant and <br /> scales The majority of the site is covered with asphalt The easterly portion of the site contains <br /> an asphalt batch plant, the western portion is occupied by a construction maintenance facility and <br />' offices (Plate 2) The site and surrounding areas are relatively flat, surface elevation on site is <br /> approximately 18 feet above sea level The site is bounded to the north and south by open fields, <br />' to the west by Harlan Road and Interstate 5, and to the east by a Southern Pacific Railroad <br /> easement The surrounding area consists primarily of commercial and light industrial properties <br /> with single-family residential areas extending east of the site <br /> MPhysiographic and Hydrogeologic Setting <br /> 1 <br />' The site is located in the central portion of the Great Valley geomorphic province of California <br /> The Great Valley is bounded by the mountains and foothills of the Sierra Nevada Range to the <br />' east and the California Coast Ranges to the west The Geologic formations of the Great Valley <br /> are typified by thick sequences of alluvial sediments deposited during the filling of a large <br /> ancient basin The 1985 United States Geological Survey(USGS) "Geologic Map of the Late <br />' Cenozoic Deposits of the Sacramento Valley and Northern Sierra Foothills, California," shows <br /> the site to be underlain by Holocene age basin deposits These deposits consist primarily of fine- <br /> grained silt and clay These conditions are consistent with those encountered during our drilling <br /> investigations Specifically, subsurface soils at the site primarily consisted of silty fine sands to a <br /> idepth of approximately 5 feet underlain by clayey silts with lenses of silty sands to the bottom of <br /> the borings <br /> The site lies within the San Joaquin River Ground Water Basin (California Department of Water <br /> Resources, 1986) Measurements taken during our previous field investigations and quarterly <br /> monitoring events revealed groundwater depths ranging from 24 to 31 feet below ground surface <br /> 1 0 <br /> WALLACE KUHL <br /> Recycled paper &ASSOCIATES INC <br />