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Ile <br /> 1, f3u l#709 iU 13hrc 111%liollimni ii <br /> Iremedial well VEW-2 The VE test equipment was trailer mounted and consisted of a propane-fueled <br /> 20-horsepower motor that was connected to a belt driven PD blower The VE blower was designed to <br /> 1 generate a maximum flow of 200 cfm and a vacuum of up to 80 inches of water column The objective of <br /> VE testing was to evaluate the following parameters <br /> 1 <br /> • Determine the vapor flow rate and vacuum that can be achieved through vadose zone soils from 10 to <br /> ' 30 feet bgs (VEW-2) and from 35 to 55 feet bgs (VEW-1), <br /> Determine the effective ROI by monitoring vacuum response at lateral monitoring point wells, <br /> ' • Determine appropriate equipment sizing requirements to maximize hydrocarbon recovery, <br /> ' • Determine initial concentrations of volatile organic compounds (VOCs) and volatile fuel <br /> hydrocarbons that can be effectively extracted from site soils <br /> ' A description of each task associated with VE testing conducted at the site is presented in the following <br /> sections <br /> ' • <br /> 42 1 Vapor Extraction Test Procedures <br /> ' Two separate VE tests were conducted on November 19, 2002 The initial VE test was conducted on <br /> remedial well VEW-1 screened from 35 to 55 feet bgs The second VE test was conducted on remedial <br /> ' well VEW-2 screened from 10 to 30 feet bgs At the start of each test, the vacuum side of the remedial <br /> equipment PD blower was connected to the respective VE test well Prior to initiating system operation, <br /> the effluent stack from the VE blower was connected to two 200-pound vapor phase granular activated <br /> carbon vessels Soil vapor extracted during system operation was consequently filtered through the <br /> carbon vessels prior to emission to the atmosphere Additionally, a photo-ionization detector (PID) was <br /> ' utilized throughout each test in order to monitor both influent and effluent extracted soil vapor to insure <br /> "break through"on the carbon drums did not occur <br /> 1 <br /> Upon commencing the VE test, the induced vacuum response on the respective remedial well was <br /> ' monitored with a magnehelic vacuum gauge installed on the extraction well stub-up manifold <br /> Additionally, a digital velocicalc flow meter was installed between the manual dilution valve and the <br /> 1 <br /> 0 <br /> ' 11 <br />