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r <br /> 15 November 2002 <br /> AGE-NC Project No. 95-0173 <br /> Page 3 of 8 <br /> 3.1. REMEDIATION SYSTEM PROCEDURES <br /> The SVE system utilized a Solleco Ecat 250 catalytic converter vapor extraction system. The SVE <br /> system consisted of two-inch diameter, schedule 40 PVC piping installed underground from each <br /> well-head at wells VW-1 through VW-7 and connected to the.inlet of the Solleco Ecat 250 vacuum <br /> blower; the outlet from the vacuum blower was routed through the catalytic converter. Induced <br /> vacuum was measured utilizing a Magnehelic vacuum gauge attached to the inlet of the blower;SVE <br /> �. air flow was monitored using a Dwyer DS-200 flow sensor. The flow rate was determined from the <br /> measured differential pressure and the piping diameter using a nomograph(Appendix B). The SVE <br /> air flow along the influent and effluent-lines was monitored routinely for the presence of organic <br /> vapor using an organic vapor analyzer (OVA) equipped with a photo-ionization detector (PID: <br /> Thermo Environmental 580A; 10.0 eV; calibrated to isobutylene). Sampling ports were installed <br /> upstream of the vacuum blower inlet to recover SVE influent air flow vapor stream samples, and <br /> downstream of the catalytic converter to recover effluent SVE air flow samples to monitor the <br /> efficiency of hydrocarbon destruction. Field measurements were recorded at regular intervals <br /> throughout the pilot test and are summarized in Table 6;SVE performance at the site is summarized <br /> �- in Table 7. <br /> 3.2. COLLECTION AND ANALYSIS OF VAPOR EXTRACTION AIR FLOW SAMPLES <br /> Between 11 June 2002 and 26 September 2002, a total of four pairs of extracted air flow vapor <br /> samples were collected from the influent and effluent of the SVE unit to measure concentrations of <br /> hydrocarbon vapor. The samples were collected in Tedlar bags using a hand air-vacuum pump. <br /> `r Following sample collection,the samples'were properly labeled,placed in a covered container and <br /> transported under chain-of-custody to McCampbell Analytical Laboratory (MAL) in Pacheco, <br /> r California. Each sample was analyzed within 72 hours of collection for TPH-g, BTEX and MTBE <br /> in accordance with EPA Methods 8015C Modified and 8021B. <br /> 4.0. FINDINGS <br /> Ground water elevation, flow direction and gradient were determined from field data collected on <br /> 20 September 2002; the contaminant impact to ground water was quantified from the ground water <br /> laboratory data. <br /> r <br /> Advanced GcoEnvironmental,Inc. <br /> r <br />