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i27 June 2002 <br /> AGE-NC Project No 98-0448 <br /> iPage 3 of 8 <br /> i utilizing a regenerative vacuum blower and two 100-gallon carbon canisters, during this time, IAS <br /> remediation was continually operated at the site on wells AW-1 through AW-4 utilizing an electric <br /> air compressor to infect air beneath the water table Operation and design of the SVE and IAS <br /> i systems for the site were described in Remedial Action Work Plan dated 07 July 2000, prepared by <br /> AGE, and approved by the EHD by letter dated 14 July 2000 <br /> i3 1 SOIL VAPOR EXTRACTION/IN-SITU AIR SPARGE SYSTEM PROCEDURES <br /> The SVE system utilizes a model Fuji, 3-horsepower regenerative vacuum blower and two <br /> 100-gallon carbon canisters to extract and adsorb hydrocarbon vapor from the subsurface Two-inch <br /> diameter, schedule 80 PVC piping was Installed underground from wells VW-1 through VW-5 to <br /> the inlet of the regenerative vacuum blower, the outlet from the vacuum blower was routed through <br /> two sequential 55-gallon carbon canisters A Magnehelic vacuum gauge was attached to the Inlet of <br /> the blower, air flow was monitored at the Inlet using a Dwyer DS-200 flow sensor A flow rate was <br /> determined from the measured differential pressure and the piping diameter using a nomograph <br /> (Appendix B) <br /> I • In order to monitor the efficiency of hydrocarbon destruction, 1)the SVE air flow of the Influent and <br /> effluent streams was monitored routinely for the presence of organic vapor using an organic vapor <br /> analyzer(OVA)equipped with a photo-ionization detector(PID Thermo Environmental 580A, 10 0 <br /> eV, calibrated to isobutylene) and 2) influent and effluent air flow vapor stream samples were <br /> collected from sampling ports Installed upstream(influent)and downstream(effluent) of the vacuum <br /> I blower and analyzed Field measurements were recorded at regular intervals and are summarized in <br /> Table 6 <br /> 32 COLLECTION AND ANALYSIS OF VAPOR EXTRACTION AIR FLOW SAMPLES <br /> A total of six extracted air flow vapor samples were collected on 10 January, 21,February and I1 <br /> -March 2002 from the influent and effluent streams of the regenerative vacuum blower unit to <br /> measure concentrations of hydrocarbon vapor The samples were collected in Tedlar bags using a <br /> hand air-vacuum pump <br /> Following sample collection, the samples were properly labeled, placed in a covered container and <br /> transported under chain-of-custody to a DHS-certified laboratory for analysis Each sample was <br /> analyzed within 72 hours of collection for TPH-g and BTEX in accordance with EPA Methods <br /> r 5030/8015 Modified and 8020 <br /> Advanced Geo Environmental,Inc <br />