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i <br />' 26 September 2002 <br /> • AGE-NC Protect No 98-0448 <br />' Page 3 of 8 <br /> beneath the water table Operation and design of the SVE and IAS systems for the site were <br />' described in Remedial Action Work Plan dated 07 July 2000,prepared by AGE,and approved by the <br /> EHD by letter dated 14 July 2000 <br /> I <br /> 3 1 SOIL VAPOR EXTRACTIONIIN-SITU AIR SPARGE SYSTEM PROCEDURES <br /> IThe 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 Magnehellc 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 /> 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, <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 /> blower and analyzed Field measurements were recorded at regular intervals and are summarized in <br /> Table 6 <br /> I <br /> 3 2 COLLECTION AND ANALYSIS OF VAPOR EXTRACTION AIR FLOW SAMPLES <br /> IA total of six extracted air flow vapor samples were collected on 23 April, 13 May and 11 June 2002 <br /> from the influent and effluent streams of the regenerative vacuum blower unit to measure <br />' concentrations of hydrocarbon vapor The samples were collected in Tedlar bags using a hand air- <br /> vacuum pump <br /> IFollowing 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, BTEX and MTBE in accordance with EPA <br />' Methods 5030/8015 Modified and 8020 <br /> IAdvanced GeoEnvi ron mental,Inc <br />