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Jamar Service • • December 2013 <br /> 4075 East Main Street, Stockton <br /> Claim No: 14482 <br /> ATTACHMENT 2: SUMMARY OF BASIC CASE INFORMATION (Conceptual Site Model) <br /> Site Location/History <br /> • This case is an active commercial petroleum fueling facility and is bounded by a commercial <br /> petroleum fueling facility to the west, a residence to the north, a business across South Avenue <br /> to the east, and an empty lot and a residence across East Main Street to the south. <br /> • Site maps showing the location of the former USTs, monitoring wells, groundwater level <br /> contours, and MTBE concentration contours are provided at the end of this review summary <br /> (Cardno ATC, 2013). <br /> • Nature of Contaminants of Concern: Petroleum hydrocarbons only. <br /> • Source: UST system. <br /> • Date reported: January 1999. <br /> • Status of Release: USTs removed and replaced. <br /> Tank Information <br /> W2500 <br /> Contents Closed in Place/ Date <br /> Removed/Active <br /> Waste Oil Removed 1995 <br /> Kerosene Removed 1995 <br /> Gasoline Removed December 1998 <br /> Gasoline RemedDecember 1998 <br /> Gasoline Active <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: Stockton East Water District and by the City of Stockton Municipal <br /> Utilities District. <br /> • Distance to Nearest Supply Well: According to data available in GeoTracker, there is one <br /> supply well regulated by the California Department of Public Health within 534 feet northeast <br /> (downgradient) of the Site. No other water supply wells were identified within 1,000 feet of the <br /> 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/Hydrogeology <br /> • Stratigraphy: The Site is underlain by interbedded and intermixed sand, silt, and clay. <br /> • Maximum Sample Depth: 115 feet below ground surface (bgs). <br /> • Minimum Groundwater Depth: 50.32 feet bgs at monitoring well MW6c. <br /> • Maximum Groundwater Depth: 72.75 feet bgs at monitoring well MW9b. <br /> • Current Average Depth to Groundwater: Approximately 51 feet bgs. <br /> • Saturated Zones(s) Studied: Approximately 50 - 111 feet bgs. <br /> • Appropriate Screen Interval: Yes. <br /> • Groundwater Flow Direction: Variable, northeast to southeast with an average gradient of <br /> 0.0028 feet/foot (December 2012). <br /> Page 6of14 <br />