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Three B's Truck Plaza - 5 - June 2012 <br /> Claim No. 12992 <br /> Receptors <br /> • GW Basin: San Joaquin Valley - Eastern <br /> • Beneficial Uses: None specified, deeper aquifer(s) used for drinking water supply <br /> Land Use Designation: None specified, aerial photo show site is commercial surrounded <br /> by mixed commercial and residential <br /> • Public Water System: San Joaquin County Municipal Water System <br /> • Distance to Sensitive Receptors: Upland canal is approximately 5,000 feet west of the <br /> Site. Two San Joaquin County Municipal wells lie 1100 and 1600 feet southeast of the <br /> site, respectively. Domestic wells lie 140 feet southwest, 250 feet southeast and <br /> 1,100 feet north northeast. <br /> Risk Criteria <br /> • Estimate of Hydrocarbon Mass in Soil: None reported <br /> • Soil/Groundwater tested for MTBE: Yes, see table below <br /> • Plume extent and mobility: Defined, plume is shrinking in size and concentration <br /> • Contaminated Zone(s) Used for Drinking Water: No <br /> • Risk from Residual Petroleum Hydrocarbons: Soil vapor survey conducted in 2011, soil <br /> vapor samples below ESLs <br /> Remediation Summary (Secondary Source Removal) <br /> • Free Product: AGE calculated in 2011 that 9757 pounds of TPHg remain in site soil. <br /> • Soil Excavation: Approximately 250 cubic yards contaminated soil was excavated and <br /> removed from site in 1998. <br /> • In-Situ Soil/ Groundwater Remediation: Soil vapor extraction and air sparging, <br /> conducted intermittently from December 2009 through September 2011, removed <br /> 73,813 pounds of TPHg. The rate of removal in September 2011 was 5 pounds of TPHg <br /> per day. <br /> Tank Information <br /> Tank No. Size in Gallons Contents Closed in Place/ Date <br /> Removed/Active <br /> USTs <br /> 1-3 12,000 Gasoline Removed Oct 98 <br /> 4 10,000 Diesel Removed Oct 98 <br /> ASTs <br /> 5,6 10,000 Gasoline Active <br /> 7 20,000 Diesel Active <br /> WZ - W-1 <br /> tit• kt . <br /> } <br /> . �—. _.__ <br /> V _ <br /> c{(J l4v <br />