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01 September 2005 AGE-NC Project No 95-0173 ' Page 5 of 10 IIn order to monitor efficiency of the SVE system 1) a Magnehelic vacuum gauge (Dwyer DS-200 flow sensor) was installed prior to the inlet of the SVE unit to monitor air flow,the flow rate was determined from the measured differential pressure and the piping diameter using a nomograph (Appendix D). 2) SVE air flow of the influent and effluent streams was monitored routinely for the presence of organic vapor using an organic vapor analyzer (OVA) equipped with a photo-ionization detector (PID Thermo Environmental 58013, 10 0 eV, calibrated to isobutylene), and 3)Influent and effluent air flow vapor stream samples were collected from sampling ports installed upstream (influent) of the vacuum blower and downstream (effluent) of the carbon canisters, and submitted for laboratory analysis Field measurements were recorded at regular intervals and are summarized in Table 6 I 32 INSIT- AIR SPARGING SYSTEM PROCEDURES U I• The IAS system utilizes a 5-horsepower, Speedaire (model no 5F229B) electric air compressor to inject air beneath the water table From the outlet of the air compressor, a manifold network of ' 1-inch diameter, schedule 80 PVC piping was installed underground to the well heads at IAS wells AW-1 through AW-7, and ground water monitoring wells MW-1 through MW-3 A Wilkerson oil filter (model no M18) and Wilkerson air pressure regulator (model no R28) are installed at the ' outlet of the air compressor for added controls The injected air should volatilize dissolved hydrocarbons in the ground water and force hydrocarbon vapors into the vadose zone, where they can be withdrawn by the SVE system described above ' Between 22 December 2004 and 06 January 2005, air pressure was continuously discharged from the air compressor to well AW-1B at 14 pounds per square inch (psi), between 06 January and 08 ' March 2005, AW-213 was utilized for continuous air sparging at 15 psi, between 08 March and 08 June 2005, AW-113 was utilized for continuous air sparging at 14 psi 33 COLLECTION AND ANALYSIS OF VAPOR EXTRACTION AIR FLOW SAMPLES ' A total of six sets of extracted air flow vapor samples were collected on 20 January, 16 February, 16 March, 06 April, 03 May and 08 June 2005 from the influent of the regenerative vacuum blower unit to measure concentrations of hydrocarbon vapor and from the effluent carbon canisters to measure hydrocarbon vapor adsorption The samples were collected in Tedlar bags using a hand . air-vacuum pump ' Advanced GeoEnvaronmental,Inc