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v <br /> 2-7 <br /> Water levels were measured in wells W-1,W-2,W-lA, W-3,W-9, and W-2A periodically <br /> during the pumping. Appendix C provides the aquifer test data forms for each well. <br /> The water level in E-1 was measured using a dedicated ORS interface tape. Water levels <br /> in the observation wells were measured using a single marine moisture interface tape <br /> decontaminated between each well. Pump rates were calculated by dividing the reading from a <br /> continuous flow gauge (in gallons) by the transpired time. <br /> ` Trenching and Piping; <br /> Vapor and groundwater extraction piping and valves were;installed by Triangle Construction <br /> a;the site from April 23, 1990,to May 10, 1990. The pip'mg and valves will be used to transmit <br /> i fM gasoline vapors to a vapor treatment system, and the groundwater to the groundwater treatment <br /> is system, both to be installed in the future. <br /> All piping; consisted of either 4-inch or 6-inch-diameter Schedule 80 polyvinyl chloride ' <br /> �,. (PVC)buried below grade. All piping runs with a 0.002 slope(away from the wells) to the near <br /> of the station. <br /> Each vapor well was completed at the surfece with a prerast concrete box measuring 30 in <br /> ! x 48 ui x 30 in deep with a locking traffic-rated cover. <br /> -: Figure 2-2 is a site plan nor the vapor extraction system. <br /> i <br /> L ,Al <br /> t j <br /> l 1 <br /> k 222 1 <br />