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1 <br /> Harding Lawson Associatiss <br /> • Extraction of groundwater for surface treatment; and <br /> In-situ bioremediation. <br /> 1. No Action <br /> Monitoring groundwater to measure effects of <br /> 1 natural remediation processes (bioremediation, oxidation, and <br /> ' volatilization) was not chosen because unaided natural processes <br /> are relatively slow; the current condition of groundwater at this <br /> site has been identified by SJCPHS/EHD as warranting remedial <br /> actions that will accelerate removal of hydrocarbon constituents. <br /> 2 . Soil Vapor Extraction of Hydrocarbons from the <br /> Groundwater Surface <br /> Soil venting can expedite recovery of hydrocarbons <br /> associated with the groundwater when compared with groundwater <br /> extraction alone. Most petroleum hydrocarbons have a specific <br /> ' gravity less than groundwater and tend to accumulate in the <br /> ' capillary fringe lust above the groundwater surface. Vacuum <br /> induced air flow through the capillary fringe will volatilize <br /> gasoline hydrocarbons which may be inaccessible with groundwater <br /> extraction. Therefore, this is the recommended remedial action <br /> ' for the removal of hydrocarbons associated with the groundwater <br /> and the unsaturated soil. <br /> ' 3 . Extraction of Groundwater for Surface Treatment <br /> Extraction of groundwater for surface treatment is <br /> ' a direct means of recovering released hydrocarbons and preventing <br /> their migration. This method requires pulling several pore <br /> ' 12 <br />