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06 November 2006 AGE-NC Project No. 95-0184 Page 5 of 6 i wells VW-2A,VW-3A,VW-5A,VW-513 and existing ground water extraction well EW-1 in a series of trenches, approximately 12-inch wide and 18-inches deep. All PVC piping will be routed underground from each remediation well head to the SVE condensation entrapment tank, located inside the SVE remediation system enclosure.A PVC ball valve will be installed at each SVE well head so that soil-gas vapor can be drawn from each well independently or from a combination of specific wells. Following piping placement, the trench will be backfilled with imported road-base sand, compacted and covered with resurfaced with concrete. A cut view drawing of the process piping layout is included in Figure 2. 3.3. SOIL VAPOR EXTRACTION SYSTEM DESIGN A catalytic oxidizer soil vapor extraction system(SVE)is proposed 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 condensation entrapment chamber, and then routed to the inlet of a vacuum blower; the outlet from the vacuum blowe wil b euted through the catalytic oxidizer. A diagram of a typical system is illustrated in, e' .. he SVE 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. Following 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. 3.3.1. 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 OVA 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 Advanced GeoEnvironmenhi,Inc.