Laserfiche WebLink
03 July 1997 <br /> AGE-NC Project No 95-0130 <br /> Page 4 of 9 <br /> hydrocarbon vapors is expected throughout the entire cleanup duration <br /> 3 1 PROPOSED SOIL VAPOR EXTRACTION SYSTEM DESIGN <br /> A thermal destruction process is proposed for hydrocarbon vapor recovery by utilizing a direct fired <br />' thermal oxidizer vapor extraction system (VES) A typical diagram of the system is illustrated in <br /> Figure 3 -Pi oposed Soil Vapor Extraction System <br /> I The VES will be connected through a manifold box to the vapor recovery wells and should be able <br /> to operate between 225 and 250 cubic feet per minute (cfm) The thermal oxidizer can be outfitted <br /> with a catalytic module and/or a heat exchanger to provide an effective destruction ratio at reduced <br /> I concentrations of hydrocarbon vapor Soil vapors will be extracted from a configuration of extraction <br /> wells using a vacuum blower and routed to the thermal oxidizer Supplemental fuel (i e natural gas) <br /> will be added to maintain the optimal temperature for a maximum destruction rate of hydrocarbon <br /> vapors Additional information on the proposed system is included with Appendix A <br /> 3 1 1 PROPOSED SOIL, VAPOR EXTRACTION WELLS <br /> Initiation of an SVE system is proposed within the"core" petroleum hydrocarbon-impacted area The <br /> SVE system will consist of the three existing dual and triple completed SVE wells (VW-1 through <br /> VW-3) located near the former UST area The SVE well locations are depicted in Figure 2 The well <br /> construction diagrams are depicted in Figure Nos 4 through 6 - Soil Vapor Extraction Coiisti action <br /> Diagram <br /> 3 1 2 PROPOSED SYSTEM LOCATION AND DESIGN <br /> I The location of the VES unit is proposed near the southwest corner of the Top Filling Station Garage <br /> building (Figure 7-Soil Vapor ati-actionlAir Sparging System) This proposed location of the VES <br /> unit will be located in an area not easily accessible to the general public and allow the Top Filling <br /> Station to conduct their day to day business without interference from the operation of the VES unit <br /> A gated enclosure, approximately 15 by 20 feet, will secure the VES unit <br /> Two-inch diameter PVC piping will be installed underground from the SVE well head locations to <br /> a vapor dropout drum The PVC piping will carry hydrocarbon vapors from the SVE well heads to <br /> the VES unit A brass flow control valve will be installed in each line so that vapors can be drawn <br /> from each well independently A plan of the proposed piping system and enclosed VES unit location <br /> are depicted in Figure 7 <br />