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Former Beacon Station No 12419 March 18, 2002 <br /> Stockton California Problem Assessment Re orVCorrective Action Plan <br /> 10.1.4 Excavation and Aboveground Treatment <br /> Excavation and aboveground treatment consists of various methods of aeration, soil vapor <br /> extraction, and bio-treatment Aeration involves thin spreading of the excavated soils on an <br /> impermeable surface to allow removal of hydrocarbons through volatilization Thin-spread <br /> soils are periodically turned to maximize surface exposure and aeration Microbes naturally <br /> occurring in soils also convert both volatile and nonvolatile hydrocarbon components to <br /> primarily carbon dioxide (CO2) and water <br /> Aboveground soil vapor extraction involves the in-situ venting of hydrocarbons in soil <br /> through a vapor recovery line network installed within the stockpiled excavated soils <br /> Hydrocarbons contained in the soil vapors may be removed by combustion, adsorption, or <br /> direct discharge to the atmosphere, depending on the concentrations <br /> • Bio-treatment involves creating an environment in excavated soil that promotes <br /> decomposition of hydrocarbons by microbes Fertilizer and oxygen are supplied to the <br /> excavated soils by cultivation, and forced ventilation enhances the performance and <br /> propagation of the microbes Following treatment, the soils may be disposed of through an <br /> appropriate landfill or used as backfill material <br /> 10.2 Groundwater Remediation Alternatives <br /> The following groundwater remediation alternatives are discussed in this section <br /> • Passive Remediation <br /> • Aboveground Treatment <br /> • Air Sparging <br /> • In-Situ Bioremediation <br /> 419PARCAP3-02 doc 21 <br /> Project No 1419 23 HORIZON ENVIRONMENTAL INC. <br />