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25 April 2005 <br /> i AGE-NC Project No 95-0128 <br /> Page 3 of 8 <br />' capable of drawing a maximum 150 standard cubic feet per minute (scfm) installed within the <br /> current fenced remediation enclosure The piping between the blower and GAC vessels was <br /> completed within the fenced enclosure at the site The SVE system network utilized three-Inch <br /> diameter connections between vessels to optimize the air-stream flow volume The vapor extraction <br /> wells were Independently connected with two-inch PVC pipe to the Inlet of the vacuum blower <br /> through a 55-gallon moisture removal drum, equipped with a condensate pump for water treatment <br /> though the ground water treatment system <br /> A Magnehelic vacuum gauge was temporarily attached to the inlet of the blower to measure vacuum <br />' pressure exerted on the extraction well,and a cumulative flow meter was utilized downstream of the <br /> carbon canisters to monitor air flow <br /> Sampling ports were installed upstream of the knockout vessel and downstream of the carbon vessels <br /> to recover influent and effluent SVE air flow samples used to monitor the efficiency of hydrocarbon <br /> removal, In addition,the influent and effluent streams were monitored routinely for the presence of <br /> organic vapor using an organic vapor meter(OVM)equipped with a photo-Ionization detector(PID <br /> Thermo Environmental 580, 10 0 eV, calibrated to isobutylene) The GAC was replaced on 23 <br /> March 2005 to prevent excessive hydrocarbon discharge Field measurements, recorded at regular <br /> intervals between January and March 2005 are summarized in Table 2 <br /> 1 2 2 1 SVE Start-Up <br /> The SVE unit is operated In accordance with APCD permit 5984-1 The SVE system began <br /> operation on 05 October 2004, when the SVE blower was temporarily connected to a power panel <br /> located on the northern side of the building at the site, Initiation of the SVE operation was observed <br />' by representatives of the APCD The SVE flow rate, vacuum (potential), and concentrations of <br /> hydrocarbons in the extracted soil-vapor were measured and a set of soil-vapor samples were <br /> collected,the soil-vapor samples were collected to document baseline concentrations of petroleum <br />' hydrocarbons in the soil-vapor extracted by the SVE network and to determine the treatment system <br /> hydrocarbon destruction rate <br /> 2 2 2 Soil-Vapor Extraction <br />' The SVE system was monitored regularly weekly for the first two-months of operation and monthly <br /> thereafter During each monitoring event, the flow rate of extracted soil-vapor (influent) was <br /> measured using a totalizing-flow Blue White roto-meter Vacuum potential was measured at the <br /> 2-inch influent line by the Magnehelic vacuum gauge In addition,the organic vapor concentrations - <br /> • in the influent stream (before entering the blower) and the effluent stream (after exiting the carbon <br /> 1 Advanced GeoEnvironmental,Inc <br />