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San Joaquin ey Air Pollution Control District <br /> Page 4 <br /> pressure/temperature, and volatile organic compound concentrations; and polyvinyl chloride piping <br /> and fittings for wellhead connections. <br /> The test methodology is summarized below: <br /> Test WelI MWI <br /> The IC engine was used to apply a vacuum to test well MWI for two hours while the vacuum <br /> influence in wells VW1, MW2, MW3, and MW4 were observed. Two influent vapor samples were <br /> collected for laboratory analysis from MWI, one at the beginning and one at the conclusion of the <br /> test. <br /> Test Well VWl <br /> The IC engine was operated for four hours on test well VWl while the vacuum influences in wells <br /> MWI, MW2, MW3, and MW4 were observed Two influent vapor samples were collected for <br /> laboratory analysis from VW1, one at the beginning and one at the conclusion of the test. <br /> Vapor Extraction Test Results <br /> During the VET using well MWI as the extraction well, induced vacuum was observed in each of <br /> the observation wells, with immediate influence observed in wells VW1 and MW2. The flowrate <br /> from MWI was relatively low, at approximately 10-15 cubic feet per minute (cfm), with an applied <br /> vacuum between 18 and 20 inches of water. <br /> During the vapor extraction test using test well VW1 as the extraction well, induced vacuums were <br /> observed in each of the observation wells. The flowrate from V W 1 ranged from 20 to 24 efm, with <br /> an applied vacuum between 50 and 58 inches of water. <br /> Vapor concentrations were monitored during the testing of each vapor well with a PID. <br /> Monitoring was conducted on the influent vapor stream prior to the addition of any dilution air. <br /> In most cases, the PID could not quantify the influent vapor concentrations as they were high <br /> enough to trip the instrument alarm (concentrations greater than 2,000 ppmv). Vapor extraction <br /> test data are summarized in Table 5. <br /> Estimated Radius of Influence <br /> During the test on MWI (screened from 60 to 80 feet bgs) an induced vacuum of 0.33 to 0.36 <br /> inches of water was observed in well VW1 (screened from 55-70 feet bgs) and an induced <br /> vacuum of 0.15 to 0.22 inches of water was observed in well MW2 (screened from 58 to 78 feet <br /> bgs). During the test on VW1 the induced vacuum in wells MWI, MW2, and MW4 ranged from <br /> 0.79 to 0.83 inches of water, 0.48 to 0.50 inches of water, and 0.40 to 0.41 inches of water, <br /> respectively. <br /> GAGROUNDZC\TULEBURG\Vapor Extraction permits\VEScvrhr.DOC <br />