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� r <br /> ASS(VYAT4t <br /> 0 C" I ATE S INC <br /> additional shallow vapor wells are proposed to effectively remediate impacted soil and to capture off= <br /> gas from air sparging. <br /> C . . <br /> The VES will be operated under similar conditions as the VET to achieve a.similar estimated radius of <br /> influence for each well. The VES will be operated using individual wells or sets of vapor wells in ' <br /> sequence, rather than operating all wells concurrently. This approach should minima the size and <br /> inherent operating casts for the off-gas abatement unit, while still.-allowing maximization of airflow <br /> from individual'wells. <br /> i <br /> The actual radius of influence for each vapor extraction well will vary depending on subsurface <br /> geologic conditions, the extent and distribution: of hydrocarbon-impacted sail, the effect of <br /> concurrently operating the AS system,and site-specific operating conditions of the VES'; The effective <br /> radius of influence should be evaluated following long-term operation of the VES. <br /> I; <br /> 5.1.2 Vapor Extraction System Treatment Processes <br /> Subsurface piping will direct extracted vapor from the wells to a nearby remediation compound. C <br /> Components of the VES located in the remediation compound will include the following: a vapor <br /> extraction blower that will extract vapor from the wells through the subgrade piping; a flow indicator <br /> that measures extracted airflow; a condensate separator to remove entrained droplets of moisture, a <br /> catalytic oxidizer, thermal oxidizer', I.C. engine, or vapor-phase carbon, associated piping, control <br /> valves, pressure gauges, flow meters, instrumentation and controls, a remote monitoring system to <br /> transmit the status of process variables and any alarm or upset conditions; and a fenced remediation <br /> compound or contained remediation system to precludepublic access. <br /> 5.2 Groundwater Remediation System <br /> 5.2.1 Groundwater Air Sparging <br /> The proposed groundwater AS system will utilize three proposed air sparge wells and a blowerlair <br /> compressor to address the hydrocarbon impacted groundwater. The AS system will be operated under <br /> similar conditions as the pilot test although with the use of propeiily designed sparge wells, the pressure <br /> Wi162574t01rcaP report.doc <br /> i <br />