Laserfiche WebLink
v <br /> 3.3.4 Preferred Remedial Alternative <br /> The criteria for selecting an alternative to control offsite migration of the contaminated <br /> groundwater plume at the 102 S Wilson Way site include the cost and time required to <br /> achieve required cleanup levels, the applicability of the selected technology, and the <br /> likelihood of regulatory approval A comparison of available technologies and the <br /> anticipated site conditions indicates that high-vacuum vapor and groundwater dual <br /> extraction with catalytic oxidation of groundwater and vapors is the preferred <br /> alternative This analysis assumes that 102 S Wilson Way can obtain the necessary air <br /> and water discharge permits that allow low concentrations of volatile compounds (such <br /> as benzene) into the atmosphere and the publicly owned treatment works (POTW). if <br /> either permit cannot be obtained, then reinf ltration to enhance biodegradation may be <br /> the only remaining alternative This technology is less cost effective than dual <br /> extraction and also requires reinfection permits from the local health agency and the <br /> RWQCB. <br /> 4.0 REMEDIAL TREATMENT EFFECTIVENESS MONITORING PHASE <br /> The effectiveness of the selected remedial alternative will be monitored Effectiveness <br /> monitoring will include quarterly groundwater and soil gas phase sampling and <br /> analysis The concentrations will be plotted geometrically versus time to remediation <br /> effectiveness Sampling and analysis will proceed until 4 consecutive quarters of non- <br /> detect concentrations Three confirmatory borings will be advanced at the site <br /> Groundwater samples will be collected and analyzed for TPH and BTEX. Assuming <br /> these samples are clean, a closure report will be prepared requesting to terminate <br /> remedial actions The cost to complete this work are summarized in Table 4-1. <br /> 17 <br /> 1 <br />