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iC\V( 0 <br /> A S S O C I A T E S I N C <br /> ♦ Criterion 6 <br /> The long term effectiveness would be considerable if the entire plume of impacted <br /> groundwater is contained in the radius of influence of the pumping wells, preventing any <br /> possibility of additional migration of groundwater <br /> ♦ Criterion 7 <br /> This alternative would have minor implementation difficulties due to the high volume of <br /> activity at the site <br /> ♦ Criterion 8 <br />' The immediate impact to the nearby community would be moderate Negative impacts <br /> would include noise and disruption of site activities for one to two weeks when the <br /> groundwater extraction and treatment system is installed Impact of additional water <br />' through City of Ripon sewer system would likely be minimal <br /> 8.3 In-Situ Air Snaraing 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 <br /> humans Groundwater would be monitored periodically to ensure that reduction is <br /> occurring The potential fire or explosion hazard is minimal due to the relatively low levels <br /> of documented residual hydrocarbons, and would be further minimized with a properly <br /> designed system and regularly scheduled monitoring and maintenance <br /> 1 ♦ Criterion 2 <br /> Vapor extraction and air sparging would reduce the level of toxicity, mobility and volume <br /> of contaminants in the soil and groundwater to levels acceptable to regulatory agencies A <br /> pilot test would have to be conducted to determine if this is a feasible alternative for <br /> 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 air spargmg remediation alternative would require the <br /> installation of at least three vapor extraction wells, at least one air sparge well, and the <br /> abatement equipment A pilot test would be conducted to determine if this remedial option <br /> is feasible If the pilot test indicates this remedial option is feasible, vapor-phase carbon can <br /> be used for treatment of off-gases It may be necessary to utilize another off-gas abatement <br /> method, which would require considerable capital outlay Additional costs to the client <br /> ' would be incurred for permitting, purchasing or leasing, and installing the vapor extraction <br /> W 1130991reportslsumweh doc 12 <br />