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1 ` 08 April 2005 AGE-NC Project No 95-0173 ' Page 5 of 10 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 580B, 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 32 IN-SITU AIR SPARGING SYSTEM PROCEDURES 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 jigoutlet 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dissolved hydrocarbons in the ground water and force hydrocarbon vapors into the vadose zone, where they can be withdrawn by the SVE system described above Between 23 September and 22 December 2004, air pressure was continuously discharged from the air compressor to well AW-1B at 14 pounds per square inch (psi) Utilizing a Solinst water level indicator and a YSI-50 dissolved oxygen meter,measurements of ground water depth and dissolved oxygen from ground water monitoring wells MW-1,MW-2,and MW-3 were performed to determine if ground water mounding was occurring as a result of the above IAS activities 3 3 COLLECTION AND ANALYSIS OF VAPOR EXTRACTION AIR FLOW SAMPLES A total of three sets of extracted air flow vapor samples were collected on 25 October,22 November, and 22 December 2004 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 Following sample collection,the samples were properly labeled,placed in a covered container, and transported under chain of custody to either Castle Analytical Laboratory (CAL) or Cal Tech Environmental Laboratories(CTEL),both DI-IS-certified laboratories,for analysis Each sample was analyzed within 72 hours of collection for TPH-g, BTEX, and MTBE in accordance with EPA . Methods 8015M and 8020/8021 ■ Advanced GcoEnvironmental,Inc