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Phase I Environmental Site Assessment 1 Terracon <br /> Proposed CarMax Automotive Dealership ■ Stockton, CA <br /> August 8, 2015 ■ Terracon Project No. NAI 57024 <br /> 2.0 PHYSICAL SETTING <br /> Physical Setting <br /> Physical Setting Information Source <br /> Topography(Refer to Appendix A for an excerpt of the Topographic Map) <br /> Site Elevation Approximately 30 feet(NGVD) <br /> Surface Runoff/ USGS Topographic Map, Lodi <br /> Topographic Gently sloping towards the west-southwest South, California Quadrangle, <br /> Gradient dated 1976 and Stockton West, <br /> Closest Surface Mokelumne Aqueduct, approximately California Quadrangle, dated 1987 <br /> Water 1,100 feet west of the site. <br /> Soil Characteristics <br /> Soil Type Stockton clay, 0 to 2%u slopes <br /> Somewhat poorly drained soils with 0 to 2 <br /> percent slopes. Parent materials consist of San Joaquin County, CA USDA- <br /> Description alluvium derived from mixed rock sources. NRCS Web Soil Survey issued <br /> Typical soil profiles consist of 0 to 37 inches September 17, 2014 <br /> clay, 37 to 42 inches clay loam underlain <br /> with cemented soils from 42 to 60 inches. <br /> Geo logy/Hyd rog eo I ogy <br /> Formation Modesto Formation, Upper and Lower <br /> Members Qm, Preliminary Geologic Map Showing <br /> The Modesto Formation (alluvium) is Quaternary Deposits of the Lodi <br /> Description characterized by no stipple to dense stipple Quadrangle, California by D.E. <br /> sands and silts deposited in the Marchand and B.F.Atwater, 1979 <br /> Pleistocene age. <br /> California Department of Water <br /> Estimated Depth to Unknown, closest known measurements Resources, Groundwater <br /> First Occurrence of are over 4,000 feet from property, depth to Information Center Interactive <br /> Groundwater water in both wells appears to be Map, Spring 2014, State Well ID <br /> approximately 60 feet bgs. 02N06E111_001M and <br /> 02N06E24J003M <br /> *HydrogeologicTAccording to the California Department of Water Resources, Groundwater <br /> Gradient formation Center, Interactive Map, Spring 2014 the regional hydrogeologic <br /> adient is to the north east. <br /> The groundwater flow direction and the depth to shallow, unconfined groundwater, if present, would likely vary depending upon <br /> seasonal variations in rainfall and other hydrogeological features.Without the benefit of on-site groundwater monitoring wells surveyed <br /> to a datum,groundwater depth and flow direction beneath the site cannot be directly ascertained. <br /> 3.0 HISTORICAL USE INFORMATION <br /> Terracon reviewed the following historical sources to develop a history of the previous uses of the <br /> site and surrounding area, in order to help identify past uses for indications of RECs. Copies of <br /> selected historical documents are included in Appendix C. <br /> Responsive ■ Resourceful ■ Reliable 4 <br />