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21 May 2001 <br /> . AGE-NC Project No 95-0173 <br /> IPage 3 of 7 <br /> approved by the PHS-EHD by letter dated 20 April 1999 <br /> 3 1 SOIL VAPOR EXTRACTION/IN-SITU AIR SPARGE SYSTEM PROCEDURES <br /> Between 01 January 2001 and 31 March 2001, the SVE and IAS remediation systems were <br /> operational at the site The SVE system utilized a Solleco Ecat 250 catalytic converter vapor <br /> extraction system The SVE system consisted of two-Inch diameter, schedule 40 PVC piping <br /> Installed underground from each well-head at wells VW-1,VW-2, VW-3, VW-4, VW-5, VW-6 and <br /> VW-7 and connected to the Inlet of the Solleco Ecat 250 vacuum blower, the outlet from the vacuum <br /> blower was routed through the catalytic converter Induced vacuum was measured utilizing a <br /> Magnehelic vacuum gauge attached to the Inlet of the blower, SVE air flow was monitored using <br /> a Dwyer DS-200 flow sensor The flow rate was determined from the measured differential pressure <br /> and the piping diameter using a nomograph (Appendix B) The SVE air flow rate at the influent and <br /> effluent was monitored routinely for the presence of organic vapor using an organic vapor analyzer <br /> (OVA) equipped with a photo-Ionization detector (PID Thermo Environmental 580A, 10 0 eV, <br /> calibrated to isobutylene) Sampling ports were installed upstream of the vacuum blower inlet to <br /> recover SVE influent air flow vapor stream samples, and downstream of the catalytic converter to <br /> I recover effluent SVE air flow samples to monitor the efficiency of hydrocarbon destruction Field <br /> measurements were recorded at regular Intervals throughout the pilot test and are summarized in <br /> Table 5 <br /> I <br /> 3 2 COLLECTION AND ANALYSIS OF VAPOR EXTRACTION AIR FLOW SAMPLES <br /> A total of three pairs of extracted air flow vapor samples were collected from the influent and <br /> effluent of the regenerative vacuum blower unit to measure concentrations of hydrocarbon vapor <br /> IThe samples were collected in Tedlar bags using a hand air-vacuum pump <br /> Following sample collection, the samples were placed in a covered container and transported under <br />' chain-of-custody to McCampbell Analytical Laboratory (MAL)in Pacheco, California Each sample <br /> was analyzed within 72 hours of collection for TPH-g and BTEX in accordance with EPA Methods <br /> 5030/8015 Modified and 8020 <br /> 4.0. FINDINGS <br /> Ground water elevation, flow direction and gradient were determined from yield data collected on <br /> 21 March 2001, the contaminant impact to ground water was assessed from the ground water <br /> • laboratory data <br />' Advanced GeoEnvironmental,Inc <br /> I s <br />