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30 December 1998 <br /> AGE-NC Project No 95-0173 <br />' Page 8 of 12 <br />' 41 DRILLING ACTIVITIES <br /> The following procedures will be performed pnor to any digging/drilling activities <br /> • Prepare a Site Health and Safety Plan in accordance with the Occupational Safety and Health <br /> Guidance Manual for Hazardous Waste Site Activities - Prepared by National Institute for <br />' Occupational Safety and Health, Occupational Safety and Health Administration, U S Coast <br /> Guard and U S Environmental Protection Agency, October 1985 <br />' • Notify the PHS-EHD a minimum of 48 hours prior to commencement of any work, while <br /> securing proper city/county soil boring or well permits <br />' • All drilling locations will be marked at least 48 hours in advance for an Underground Service <br /> Alert (USA) check of underground utilities or pipes <br /> 42 SOIL VAPOR EXTRACTION SYSTEM DESIGN <br /> IInitiation of an SVE system is proposed within the "core"petroleum hydrocarbon-impacted area <br /> The SVE system will consist of the two existing SVE wells (VW-1 and VW-2) in addition to five <br /> new SVE wells SVE well locations are depicted in Figure 3 <br /> A thermal destruction process is proposed for hydrocarbon vapor recovery by utilizing a direct fired <br /> I thermal oxidizer vapor extraction system (VES) A typical diagram of the system is illustrated in <br /> Figure 6 The VES will be connected through a manifold box to the vapor recovery wells and should <br /> be able to operate between 225 and 250 cubic feet per minute (cfm) The thermal oxidizer can be <br /> outfitted with a catalytic module and/or a heat exchanger to provide an effective destruction ratio at <br /> reduced concentrations of hydrocarbon vapor _Soil vapors will be extracted from the proposed <br /> configuration of extraction wells using a riracuum_blower land routed to the thermal oxidizer <br /> Supplemental fuel (i a natural gas) will be added to maintain the optimal temperature for a <br /> maximum destruction rate of hydrocarbon vapors Additional information on the proposed system <br /> is included with Appendix A <br /> 4 2 1 Soil Vapor Extraction Well Installation <br /> Installation of an additional five SVE wells is proposed utilizing a truck-mounted drill rig equipped <br /> with 8-inch diameter hollow stem augers Hollow stem augers will be cleaned prior to advancement <br /> in each borehole The SVE wells will be advanced to depths of approximately 25 feet bsg The SVE <br /> wells will be completed with 2-inch diameter, schedule 40 PVC well casing emplaced through the <br /> Adtanced GeoEn\iron mental,Inc <br /> I <br />