Laserfiche WebLink
CRYSTAL CREAMERY STOCKTON <br /> WKA No. 1628.10 <br /> February 5, 2000 <br /> Page 2 <br /> space by inducing air flow through the soil, which then carries the hydrocarbon vapors to soil <br /> vapor extraction wells with subsequent off-gas treatment. <br /> The equipment used to perform the test consisted of 1) a 280-cubic-foot-per-minute (c-fin) <br /> regenerative blower with a 5.5 horsepower explosion-proof motor; 2)instrumentation for <br /> measuring air flow rate,temperature, vacuum pressure, and volatile organic compound <br /> concentrations; 3)PVC piping, fittings, and wellhead connections; and 4) soil gas sample <br /> collection equipment. The vapor extraction unit was used to induce airflow and vacuum in the <br /> vapor extraction well. Airflow rate in the vapor extraction well was determined by measuring <br /> the pressure differential across an averaging pitot tube with a magnehelic vacuum gauge. Two <br /> vapor-phase activated carbon canisters were used as emission control devices during the pilot <br /> test. The following aboveground system performance parameters and in-situ responses were <br /> monitored during the pilot test: <br /> �= • Vacuum pressure <br /> • Vacuum flowrate <br /> • Water levels <br /> • Soil gas concentrations <br /> • Soil gas vacuum pressure(using magnehellic gauges). <br /> The vapor extraction pilot test was conducted for approximately 8 hours. The pilot test was <br /> divided into two parts at four hours each. Vapor extraction well VEW1 was used as the vapor <br /> extraction well and wells VEW2 and VEW3 were used as the observation wells during the first <br /> part of the pilot test. Well VEW3 was used as the extraction well and wells VEW1 and VEW2 <br /> were used as the observation wells during the second part of the pilot test. Vapor extraction well <br /> VEW1 is a four-inch diameter well and wells VEW2 and VEW3 are two-inch diameter wells with <br /> 0.02-inch slotted casing. The screened interval of well VEWI is 10 to 15 feet bsg and the screened <br /> intervals of wells VEW2 and VEW3 are both 10 to 13 feet bsg. The horizontal distances between <br /> vapor extraction wells VEW1 and VEW2 is approximately 20 feet,between wells VEW1 and <br /> VEW3 is approximately 10 feet, and between VEW2 and VEW3 is approximately 23 feet. The <br /> location of these wells is presented on Plate 2. <br /> INK <br /> WALLACE-KUNO.- <br /> :1 er.; FxJISSOC.IATE5INC, <br />