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N Stallworth Auto Detail October 2013 <br /> 602 California Street W, Stockton <br /> Claim No : 12235 <br /> r� ATTACHMENT 2 : SUMMARY OF BASIC CASE INFORMATION (Conceptual Site Model ) <br />'I <br /> ji Site Location/History <br /> • This Site is a used auto dealership and is bounded by a commercial building across Oak Street <br /> to the south , a business across California Street to the east, a commercial business to the west <br /> and a San Joaquin County building to the north . <br /> • Site maps showing the location of the former USTs , monitoring wells , groundwater level <br /> contours, and benzene concentration contours are provided at the end of this review summary <br /> (Advanced Geo Environmental Inc. [AGE], 2013). <br /> • Nature of Contaminants of Concern : Petroleum hydrocarbons only. <br /> • Source: UST system. <br /> • Date reported : August 1991 . <br /> • Status of Release: UST removed . <br /> Tank Information <br /> ,Tank No. Size in Contents Closed in Place/ Date <br /> Gallons Removed/Active <br /> 1 3 , 000 Diesel Removed May 1991 <br /> 2 - 3 3 , 000 Gasoline Removed May 1991 <br /> 4 550 Waste oil Removed May 1991 <br /> Receptors <br /> • GW Basin : San Joaquin Valley - Eastern San Joaquin. <br /> • Beneficial Uses: Central Valley Regional Water Quality Control Board (Regional Water Board) <br /> Basin Plan lists agricultural , municipal, domestic, industrial service and process supply. <br /> • Land Use Designation : Commercial. <br /> • Public Water System : California Water Service. <br /> • Distance to Nearest Supply Well : According to data available in GeoTracker, there are no <br /> public supply wells regulated by the California Department of Public Health 1 , 000 feet of the <br /> Site in the downgradient direction . No other water supply wells were identified within 1 ,000 <br /> feet of the Site in the files reviewed . <br /> • Distance to Nearest Surface Water: There is no identified surface water within 1 , 000 feet of the <br /> Site. <br /> Geology/Hyd rogeology <br /> • Stratigraphy: The Site is underlain by interbedded and intermixed sand, silt, and clay. <br /> • Maximum Sample Depth : 130 feet below ground surface (bgs). <br /> • Minimum Groundwater Depth : 24. 52 feet bgs at monitoring well MW2. <br /> • Maximum Groundwater Depth : 35.09 feet bgs at monitoring well MW3. <br /> • Current Average Depth to Groundwater: Approximately 25 feet bgs . <br /> • Saturated Zones(s) Studied : Approximately 20 -150 feet bgs. <br /> • Appropriate Screen Interval : Yes. <br /> • Groundwater Flow Direction : Northeasterly with an average gradient of 0.004 feet/foot (AGE, <br /> 2013) . <br /> Page 6 of 12 <br />