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Three Palms Grocery - 3 - July 2012 <br /> Claim No. 13455 <br /> Receptors <br /> • GW Basin: San Joaquin Valley — Eastern San Joaquin <br /> • Beneficial Uses: Municipal and domestic water supply <br /> • Land Use Designation: Commercial <br /> • Public Water System: None available <br /> • Distance to Nearest Supply Well: According to data available in GeoTracker, there are <br /> five CDPH regulated water supply wells within '/ mile of the site. The nearest well is <br /> 685 feet southeast from the Site. <br /> Risk Criteria <br /> • Estimate of Hydrocarbon Mass in Soil: ATC estimates 4,416 pounds of TPHg remained <br /> in the subsurface prior to active remediation <br /> • Soil/Groundwater tested for MTBE: Yes, see table below <br /> • Plume Length, Extent and Mobility: Unknown, poorly defined down gradient, little or no <br /> groundwater contamination remains <br /> • Contaminated Zone(s) Used for Drinking Water: No <br /> • Oxygen Concentration in Soil Vapor: No data <br /> • Risk from Residual Petroleum Hydrocarbons: Depth to groundwater is 90 feet and water <br /> quality objectives have been achieved, meets low threat closure criteria. Soil vapor <br /> survey and human health risk assessment is pending. <br /> Remediation Summary (Secondary Source Removal) <br /> • Free Product: None noted <br /> • Soil Excavation: Unknown <br /> • In-Situ Soil Remediation: Soil vapor extraction, conducted May 2010 through July 2011 <br /> and November 2011 through December 2011, total of 9,058 hours of operation, removed <br /> 2,666 pounds of TPHg. The extraction rate in November 2011 was 7 pounds of TPHg <br /> per day. <br /> • Groundwater Remediation: None conducted <br />