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I ,( I I ' r07 September '1999 1999 • AGE-NC Project No 95-0104 Page 3 of 8 effective remediation such that no additional active remediation in the hydrocarbon-impacted vadose zone would be necessary Continuation of the IAS pilot test consisted of infecting compressed air to well MW-6 at an approximate pressure of 10 pounds per square inch(psi) Approximately 5 to 7 psi were required to overcome the water column in the sparging wells The SVE pilot test utilized a vapor extraction system (VES), VACLEEN 1000G, manufactured by ' Environmental Techniques The VES consisted of a positive-displacement blower, driven by an internal combustion (IC) engine The inlet of the VES was connected to the well-head at VW-1 utilizing two-inch diameter, schedule 40 PVC casing and installed aboveground The vacuum was ' applied to VW-1 to cause hydrocarbons in the soil to volatilize and flow through the vacuum pump to the IC engine As noted in the Revised Corrective Action Plan-January 1997, dated 18 February 1997, the theoretical radius of influence of VW-1 is approximately 20 feet, and all of the known impacted soil lies within 15 feet of VW-1, VW-1 is adequately screened and placed to address all known impacted soil lie The extracted hydrocarbon vapor was destroyed in the IC engine as part of the internal combustion process Emissions from the engine were routed through two catalytic converters to maximize the Idestruction rate of hydrocarbon vapor A Magnehelic vacuum gauge was attached to the inlet of the VES The air stream fiom VW-1 was monitored for the presence of organic vapor using an organic vapor analyzer (OVA) equipped with a photo-ionization detector(PID Thermo Environmental 580A, 10 0 eV, calibrated to isobutylene) The air flow was monitored using a Dwyer DS-200 flow sensor The flow rate was determined from the measured differential pressure and the piping diameter using a nomograph (Appendix D) Field measurements were recorded at regular intervals throughout the pilot test and are summarized in Table 4 3 2 COLLECTION AND ANALYSIS OF SOIL GAS SAMPLES A total of five extracted soilsam le as g samples were collected during the SVE/IAS pilot test operation from the inlet of the VES unit to measure concentrations of hydrocarbon vapor The samples were collected in Tedlar bags using an organic vapor analyzer as an air pump Following sample collection, the samples were placed in a covered container and transported under chain-of-custody to Precision Enviro-Tech Analytical Laboratory (PEAL) in Stockton California Each sample was analyzed within 72 hours of collection for TPH-g and BTE&X in accordance with EPA Methods 8015m and 8020, respectively Advaheed GeoEnvironmental,Inc I