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t26 April 2002 AGE-NC Project No 95-0173 Page 3 of 8 ' 3 1 REMEDIATION SYSTEM PROCEDURES The SVE system utilized a Solleco Ecat 250 catalytic converter vapor extraction system The SVE system consisted of two-Inch diameter, schedule 40 PVC piping Installed underground from each ' well-head at wells VW-1 through VW-7 and connected to the inlet of the Solleco Ecat 250 vacuum blower, the outlet from the vacuum blower was routed through the catalytic converter Induced ' vacuum was measured utilizing a Magnehellc vacuum gauge attached to the Inlet of the blower,SVE 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 B) The SVE ' air flow along the Influent and effluent-lines was monitored routinely 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) Sampling ports were Installed upstream of the vacuum blower Inlet to recover SVE Influent air flow vapor stream samples, and downstream of the catalytic converter to recover effluent SVE air flow samples to monitor the efficiency of hydrocarbon destruction Field measurements were recorded at regular intervals throughout the pilot test and are summarized in Table 6, SVE performance at the site Is summarized In Table 7 3 2 COLLECTION AND ANALYSIS OF VAPOR EXTRACTION AIR FLOW SAMPLES ' A total of three pairs of extracted air flow vapor samples were collected from the influent and effluent of the SVE unit to measure concentrations of hydrocarbon vapor 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 McCampbell Analytical Laboratory (MAL) in Pacheco, California Each sample was analyzed within 72 hours of collection for TPH-g and BTEX in accordance with EPA Methods 5030/8015 Modified and 8020 4.0. FINDINGS Ground water elevation, flow direction and gradient were determined from field data collected on 19 December 2001, the contammant impact to ground water was quantified from the ground water laboratory data From field and laboratory data collected at the SVE remediation system between 01 October and 31 December 2001, AGE determined the average TPH-g concentration, the average flow rate and • calculated the approximate mass and volume of hydrocarbons removed ' Advanced GeoEnviron mental,Inc