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Apache Plastics 3 - June 2012 <br /> Claim No. 1696 <br /> Benzene Trend for MW- 8 <br /> 7000 -- --- - - <br /> 6000 --- - - - . - - _- - <br /> 5000 -- - - <br /> ep <br /> m <br /> 4000 <br /> N 3000 �- --- - - -- --- - -- ---- <br /> e <br /> CIO' 2000 ---- -- ---- <br /> 1000 - ---- -- - - -- - _.._. <br /> 0 --- <br /> � <br /> g 0 0 0 0 0 0 0 0 0 0 <br /> \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ <br /> � a oa � v w � <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 : California Water Service <br /> • Distance to Nearest Supply Well : According to data available in GeoTracker, there are <br /> two CDPH regulated water supply wells within '/ mile of the site . Nearest well is <br /> 1 , 058 feet east 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 extent and mobility: Largely defined , extensive groundwater plume, high <br /> concentrations of fuel hydrocarbons remain in source area <br /> • Contaminated Zone(s) Used for Drinking Water: No <br /> • Vapor Migration Risk from Residual Petroleum Hydrocarbons: No, this is an active <br /> station entirely covered with asphalt concrete. <br /> Remediation Summary (Secondary Source Removal) <br /> • Free Product: None reported <br /> Soil Excavation : Petroleum hydrocarbon impacted soil was removed and disposed . <br /> • In-Situ Soil Remediation : Soil vapor extraction has been conducted from July 1994 <br /> through June 1997 reportedly removed 16 , 200 pounds of TPHg <br /> Groundwater Remediation : In-situ chemical oxidation pilot test was approved in <br /> March 2012 by the County.. <br />