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' 02 August 2000 <br /> . AGE-NC Project No 95-0121 <br /> Page 3 of 7 <br />' 80 PVC piping was installed underground from wells VW-3 through VW-9 to the inlet of the <br /> regenerative vacuum blower, the outlet from the vacuum blower was routed through two sequential <br /> 55-gallon carbon canisters A MagneheIic vacuum gauge was attached to the inlet of the blower The <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 at the influent and effluent was monitored routinely for the presence of organic vapor using <br />' an organic vapor analyzer (OVA) equipped with a photo-ionization detector (PID Thermo <br /> Environmental 580A, 10 0 eV, calibrated to isobutylene) Sampling ports were installed upstream <br /> of the vacuum blower inlet to recover SVE influent air flow vapor stream samples, and downstream <br /> I of the vacuum blower to recover effluent SVE air flow samples to monitor the efficiency of <br /> hydrocarbon destruction Field measurements were recorded at regular intervals throughout the pilot <br /> test and are summarized in Table 5 " <br /> 32 COLLECTION AND ANALYSIS OF SOIL GAS SAMPLES <br /> A total of fiveairs of extracted air flow vapor samples were p p p e e collected from the influent and effluent <br /> • of the regenerative vacuum blower unit to measure concentrations of hydrocarbon vapor The <br /> 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 field data"collected on <br /> I 19 April 2000, the contaminant impact to ground water was assessed from the ground water <br /> laboratory data <br /> From field data collected at the SVE remediation system between 01 April and 30 June 2000, AGE <br /> determined the average TPH-g concentration, the average flow rate and calculated the approximate <br /> mass and volume of hydrocarbons removed <br /> 41 RELATIVE GROUND WATER ELEVATION AND GRADIENT <br /> During the April 2000 ground water monitoring event, depths to ground water in monitoring wells <br /> I <br /> Advanced CeoEnvironmental,Inc <br />