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1 <br />' 07 November 2005 <br /> AGE-NC Project No 98-0448 <br />' Page 3 of 9 <br />' Services (DHS)-certified laboratory for analysis for <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) by EPA Method 8015M, <br />' • Benzene,toluene,ethylbenzene and xylene(BTEX)and methyl tert butyl ether(MTBE), 1,2- <br /> Dichloroethane(1,2-DCA),ethylene dlbromlde(EDB),tertiary butanol(TBA),di-isopropyl <br /> ether(DIPE), ethyl tert butyl ether(ETBE), tert amyl methyl ether(TAME) and MTBE by <br />' EPA Method 8260B <br /> 3.0. SOIL VAPOR EXTRACTIONAN-SITU AIR SPARGE PROCEDURES <br />' Between 08 June 2005 and 07 September 2005, an SVE remediation,system was continuously <br /> operated at the site SVE remediation utilized a regenerative vacuum blower to selectively apply an <br /> induced vacuum to wells VW-1 and VW-6 During this time, IAS remediation was continually <br />' operated at the site on wells AW-4 (screened 25-30 feet), AW-5 (screened 30-35 feet)and MW-4B <br /> (screened 45-50 feet) Operation and design of the SVE and IAS systems for the site were described <br /> in Remedial Action Work Plan dated 07 July 2000,prepared by AGE, and approved by the EHD by <br /> f . letter dated 14 July 2000 <br />' 3 1 SOIL VAPOR EXTRACTION SYSTEM PROCEDURES <br />' The SVE system utilized a Fuji, 3-horsepower regenerative vacuum blower to volatilize and extract <br /> adsorbed hydrocarbon vapor from the subsurface A manifold network of two-inch diameter, <br /> Schedule 80 PVC piping was previously installed underground from wells VW-1 through VW-6 to <br />' a vapor moisture knockout drum and to the inlet of the regenerative vacuum blower, the outlet from <br /> the vacuum blower was discharged directly into the atmosphere due to low hydrocarbon <br /> concentrations in the vapor samples A PVC ball-valve was installed at each SVE well-head for <br />' added controls and so that the SVE network could be reconfigured when appropriate <br /> A Magnehellc vacuum gauge was attached to the inlet of the blower, air flow was monitored at the <br />' Inlet using a Dwyer DS-200 flow sensor A flow rate was determined from the measured differential <br /> pressure and the piping diameter using a nomograph (Appendix B) <br /> In order to monitor the efficiency of hydrocarbon removal, 1) the SVE air flow of the influent <br /> stream was monitored routinely utilizing an organic vapor analyzer(OVA)equipped with a photo- <br /> ionization detector (PID Thermo Environmental 580B, '10 0 eV, calibrated to isobutylene), and <br />' 2) influent air flow vapor stream sample was collected from sampling ports installed upstream <br /> . (influent)of the vacuum blower and analyzed Field measurements were recorded at regular intervals <br /> Advanced GeoEnvironmental,Inc <br />