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i <br /> Ass O C I ATE 5 I N C . <br /> i <br /> ♦ Criterion S: <br /> ' This alternative is anticipated to effectively remediate subsurface contaminants to acceptable <br /> regulatory levels within six months of implementation. <br /> ♦ Criterion 6: <br /> Groundwater would be monitored periodically until soil and groundwater is remediated to C <br /> ensure that concentrations of petroleum hydrocarbons are being reduced, which should be <br /> effective in the long-term. ' <br /> ♦ Criterion 7: E <br /> This alternative has some minor implementation problems due to the time involved in.obtaining <br /> permits from the air pollution control district (APCD) for the vapor extraction system and <br /> permits from the municipal agency for the discharge of treated water to the sewer system. <br /> Permitting could take as much as 180 days depending upon APCD work load, but is typically <br /> completed in 60 to 90 days. <br /> J <br /> ♦ Criterion 8: <br /> Impact to the site occupants and surrounding businesses during system operation and other site ' <br /> activities will be moderate. This method has been shown to be effective and regulatory <br /> I <br /> acceptance is expected. i <br /> 5_3 Alternative 2-In-Situ Air St)arging with Soil Vapor Extraction <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 humans. <br /> Groundwater would be monitored periodically to ensure that reduction is occurring. The t <br /> potential fire or explosion hazard is minimal with a properly designed system and regularly <br /> scheduled monitoring and maintenance. <br /> I I' <br /> I ♦ Criterion 2: <br /> Vapor extraction and air sparging would reduce the level of toxicity and volume of <br /> contaminants in the soil and groundwater to levels acceptable-to regulatory agencies. This <br /> method does not do anything to limit the migration of contaminants off-site which is not a <br /> concern at this site. i <br /> ♦ Criterion 3: <br /> This alternative can be implemented within regulatory guidelines. <br /> ♦ Criterion 4: <br /> The soil vapor extraction and air sparging remediation alternative would require the installation <br /> of sparge wells, air injection and vapor extraction equipment, and the abatement equipment. A <br /> thermal oxidizing unit or catalytic oxidizing unit can be used initially for the treatment of off- <br /> S:1Environmental1625771SCMCAPA&Moc 9 <br />