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it <br /> Quick-N-Save # 1 . 3 - September 2012 <br /> Claim No . 14840 <br /> BENZENE Results for MW5 <br /> 1200 <br /> laoo <br /> 800 - <br /> 600 <br /> } <br /> 400 -{ — <br /> 200 <br /> 0a 1 <br /> a 4010° <br /> BENZENE -+ +. Tren� <br /> Receptors <br /> • GW Basin : San Joaquin Valley — Eastern San Joaquin . <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 : California Water Service . <br /> • Distance to Nearest Supply Well : According to data available in GeoTracker, there are <br /> no CDPH regulated water supply wells within % mile of the site. <br /> Distance to Nearest Surface Water: No surface water noted within 1/2 mile from the Site . <br /> Risk Criteria <br /> • Estimate of Hydrocarbon Mass in Soil : None reported . <br /> • Soil/Groundwater Tested for MTBE : Yes , see table below. <br /> • Plume Length , Extent and Mobility: > 150 feet, undefined , moving down gradient. <br /> • Contaminated Zone(s) Used for Drinking Water: No . <br /> • Oxygen Concentrations in Soil Vapor: No data . <br /> • Indoor Vapor Risk from Residual Petroleum Hydrocarbons : According to the recently <br /> approved low threat closure policy , it is unnecessary to conduct vapor migration risk <br /> assessments at active retail gasoline stations . <br /> • Direct Contract Risk from Residual Petroleum Hydrocarbons : Site is paved preventing <br /> incidental exposure . <br /> Remediation Summary <br /> • Free Product: No free product was documented throughout the life of this case . <br /> • Soil Excavation : An estimated 175 cubic yards of impacted soil were removed and <br /> disposed offsite in 2000 . <br /> • In-Situ Soil/ Groundwater Remediation : Dual phase extraction pilot test conducted <br /> November 2009 . <br />