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i I21 May 2003 . AGE-NC Project No 95-0130 Page 13 of 16 I4 4 SOIL VAPOR EXTRACTION SYSTEM DESIGN AGE proposes to initiate operation of an SVE system in the core area of the petroleum hydrocarbon- I impacted area The SVE system will consist of utilizing three existing SVE wells(VW-1,VW-2 and VW-3) SVE well locations are depicted in Figure 4 A catalytic oxidizer vapor extraction system (VES) is proposed for use for hydrocarbon vapor recovery at the site The extracted hydrocarbon vapors will be extracted from the proposed configuration of extraction wells,routed through a 100-gallon steel water vapor entrapment chamber, and than routed to the inlet of a vacuum blower, the outlet from the vacuum blower will be routed through the catalytic oxidizer A diagram of a typical system is illustrated in Figure 7 The VES will be connected through a manifold box to the vapor recovery wells and should be able to operate ' between 225 and 250 cubic feet per minute(cfm) The SVE system will be outfitted with a catalytic module and/or a heat exchanger to provide an effective destruction ratio at reduced concentrations of hydrocarbon vapor Additional information on the proposed system is included with Appendix B ' Induced vacuum measurements will be collected utilizing a Magnehelic vacuum gauge attached near the inlet of the blower, SVE air flow will be monitored using a Dwyer DS-200 flow sensor lieFollowing the start-up period, the SVE air flow along the influent and effluent-lines will be monitored weekly for the presence of organic vapor using an organic vapor analyzer (OVA) equipped with a PID Sampling ports will be installed upstream of the vacuum blower inlet to recover SVE influent air flow vapor stream samples, and downstream of the catalytic converter to recover effluent SVE air flow samples to monitor the efficiency of hydrocarbon destruction 4 4 1 Soil Vapor Extraction Monitoring During the "start-up" period for the SVE system, organic vapor samples will be collected and operational parameters will be monitored on a daily basis The anticipated start-up period will be ' approximately one week Following the start-up period,the vapor extraction system will be monitored weekly using a photo- ionization detector(PID)and Dwyer DS-200 flow sensor to ensure optimal destruction of recovered hydrocarbon vapors, and to monitor cleanup progress The PID readings will be taken and recorded from the influent end of the vacuum blower unit and the effluent end of catalytic oxidizer ' Operational parameters (air flow, air vacuum and volume of processed vapor)will be measured on a weekly basis to monitor and record soil-gas volumes extracted and operational efficiency ' Vapor samples will be collected on a monthly basis from the influent and effluent end of the vapor extraction system utilizing the vacuum pump on a Model 580A organic vapor meter (Thermo ' Advanced GeoEnveronmental,Inc