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Weldon Church Residence _ December 2013 <br /> 104 West Beverly Place, Tracy <br /> Claim No: 8502 <br /> ATTACHMENT 2: SUMMARY OF BASIC CASE INFORMATION (Conceptual Site Model) <br /> Site Location/History <br /> • This case is a residence and is bounded by residences across Beverly Place to the north, and <br /> residences to the west, east, and south. <br /> • A Site map showing the location of the former USTs, monitoring wells, groundwater level <br /> contours is provided at the end of this closure review summary (Advance GeoEnvironmental <br /> [AGE], 2012). <br /> • Nature of Contaminants of Concern: Petroleum hydrocarbons only. <br /> • Source: UST system. <br /> • Date reported: August 1988. <br /> • Status of Release: USTs removed. <br /> Tank Information <br /> Tank No Size in Contents Closed in Place/ Date <br /> Gallons Removed/Active <br /> 1 550 1 Gasoline Removed 1988 <br /> Receptors <br /> • GW Basin: San Joaquin Valley - Tracy. <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: Residential. <br /> • Public Water System: City of Tracy. <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 within 250 feet of <br /> the defined plume boundary. No other water supply wells were identified within 250 feet of the <br /> defined plume boundary in the files reviewed. <br /> • Distance to Nearest Surface Water: There is no identified surface water within 250 feet of the <br /> defined plume boundary. <br /> Geology/Hydrogeology <br /> • Stratigraphy: The Site is underlain by interbedded and intermixed sand, silt, and clay. <br /> • Maximum Sample Depth: 22 feet below ground surface (bgs). <br /> • Minimum Groundwater Depth: 3.60 feet bgs at monitoring well MW-4. <br /> • Maximum Groundwater Depth: 7.93 feet bgs at monitoring well MW-3. <br /> • Current Average Depth to Groundwater: Approximately 6 feet bgs. <br /> • Saturated Zones(s) Studied: Approximately 5 - 25 feet bgs. <br /> • Appropriate Screen Interval: Yes. <br /> • Groundwater Flow Direction: North northwest with an average gradient of 0.005 feet/foot <br /> (August 2012). <br /> Page 7 of 12 <br />