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Working to Restore Nature <br /> 1 <br /> The off-gas treatment system will be modified to an activated carbon adsorption system <br /> when the hydrocarbon concentrations of extracted vapor from subsurface soil make it safe <br /> and cost-effective to do so. Typical SJVUAPCD guidelines require that, extracted vapor <br /> influent to and effluent from the carbon system will be monitored with a field instrument <br /> approved by the SJVUAPCD on a daily basis until the frequency of carbon changeout can <br /> be evaluated System monitoring frequency will likely be changed to once every two weeks, <br /> or monthly,with a field instrument and monthly verification with bag samples upon receiving <br /> I <br /> SJVUAPCD approval <br /> 65 System Performance Evaluation <br /> I <br /> Following continued operation of the VES and air sparge systems, a system performance <br /> evaluation will be conducted to monitor the effectiveness of the soil and groundwater <br /> remediation systems This evaluation will be performed in conjunction with continued <br /> 1 . groundwater monitoring and sampling at the site and will be submitted together with the <br /> regularly scheduled quarterly monitoring and sampling reports This report may include the <br /> following- hours of operation collected; system influent and effluent field monitoring <br /> 1 readings; laboratory results of influent and effluent air and water samples, total and <br /> individual vapor extraction well and groundwater extraction well flow rates, induced vacuum <br /> responses recorded in observation wells, other relevant field data collected, and results <br /> obtained such as observed radius of influence, system destruction efficiency, etc <br /> 1 <br /> Recommendations will then be made to further optimize system performance and to further <br /> enhance remediation of subsurface impacted soil and groundwater Recommendations may <br /> 1 include tie-in of additional vapor extraction wells or air sparging wells to the remediation <br /> system, upgrading of the off-gas abatement unit, etc <br /> 1 <br /> 30003-13 14 <br /> 1 <br />