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i <br />' 18 Fe <br /> • bruaiy 2003 <br />' AGE-NC Project No 98-0448 <br /> Page 3 of 8 <br /> IRemedial Action Work Plan dated 07 July 2000, prepared by AGI:, and approved by the EHD by <br /> letter dated 14 July 2000 <br /> 3 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 /> I 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 /> I 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 /> IIn 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, <br /> 10 0 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 /> Iblower and analyzed Field measurements were recorded at regular intervals and are summanzcd in <br /> Table 6 <br /> I <br /> 32 COLLECTION AND ANALYSIS OF VAPOR EXTRACTION AIR FLOW SAMPLES <br /> A total of six extracted air flow vapor samples were collected on 30 October, 11 November and <br /> 17 December 2002 from the influent and effluent streams of the regenerative vacuum blower unfit <br /> to measure concentrations of hydrocarbon vapor The samples were collected in Tedlar bags using <br /> a 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 /> I8015C Modified and 8021B <br /> I <br /> IAdvanced Ccohnvironmental,Inc <br />