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7 <br /> ♦ Criterion 7: <br /> This alternative has some minor implementability problems due to the time involved in <br /> obtaining permits from the APCD for the vapor extraction system. Permitting could take as <br /> much as 180 days depending upon APCD work load, but is typically completed in 60 to 90 <br /> days. <br /> ♦ Criterion 8: <br /> Impact to the site occupants and surrounding businesses during installation and other site <br /> activities will be moderate. This method has been shown to be effective and regulatory <br /> acceptance is expected. <br /> 7.3 Alternative 3-Vapor Extraction with Groundwater Extraction and Treatment <br /> ♦ Criterion 1: <br /> This alternative has minimal health-based risks. Petroleum hydrocarbons are removed from <br /> extracted vapor prior to release to the atmosphere eliminating the risk of exposure to <br /> humans. Petroleum hydrocarbons are also removed from the extracted groundwater prior to <br /> discharge to the local sewer system eliminating the risk of exposure to humans. <br /> Groundwater would be monitored periodically to ensure that reduction is occurring. The <br /> potential. fire or explosion hazard is minimal due to the relatively low levels of documented <br /> residual hydrocarbons, and would be further minimized with a properly designed system <br /> and regularly scheduled monitoring and maintenance. <br /> ♦ Criterion 2: <br /> Vapor extraction and groundwater extraction and treatment would reduce the level of <br /> toxicity, mobility and volume of contaminants in the soil and groundwater to levels <br /> acceptable to regulatory agencies. This method would also limit the migration of <br /> contaminants off-site and may be able to draw contaminated groundwater back on site for <br /> extraction and treatment. A pilot test would have to be conducted to determine if this is a <br /> feasible alternative for remediation of the site. <br /> ♦ Criterion 3: <br /> This alternative can be implemented within regulatory guidelines. <br /> ♦ Criterion 4: <br /> The soil vapor extraction and groundwater extraction and treatment remediation alternative <br /> would require the installation of three vapor extraction wells, one groundwater extraction <br /> well, and the abatement equipment. A pilot test would be conducted to determine if this <br /> remedial option is feasible. If the pilot test indicates this remedial option is feasible, vapor- <br /> phase carbon can be used for treatment of off-gases and liquid-phase carbon can be used for <br /> treatment of extracted groundwater. It may be necessary to utilize another off-gas <br /> abatement method, which would require considerable capital outlay. Additional costs to the <br /> S A224931reports\CAP.doc II <br />