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monitored to determine if gas is migrating off site. This Gas <br /> Monitoring Plan is designed to comply with the CIWMB°s regulations <br /> for closure and postclosure. <br /> IV. SPECIFIC PLANS <br /> Twelve tri-level soil-gas wells (GW-1 through GW-12) were installed <br /> outside the limits of the refuse fill at the locations shown on <br /> Figure 2. The installation work was performed from October 8 to <br /> October 10, 1991. Exploratory borings for the wells were drilled <br /> by a track-mounted CME 650 drill rig, equipped with 6-inch-diameter <br /> continuous-flight augers. An EMCON geologist supervised the <br /> drilling and logged the subsurface materials by examining soil <br /> cuttings. <br /> After being drilled to the designated depth, each exploratory <br /> boring was converted into a tri-level gas well consistent with the <br /> design previously approved by the California Integrated Waste <br /> Management Board (CIWMB) . Gas well construction details are shown <br /> on table 1 and are illustrated in figure 3 . The upper part of each <br /> gas probe casing consisted of a specified length of 1/2-inch <br /> Schedule 40 polyvinyl chloride (PVC) pipe. The lower 5 feet of <br /> each casing was a sampling screen consisting of 1/2-inch <br /> Schedule 80 slotted PVC pipe. Each screen section penetrated the <br /> top 5 feet of a predetermined subsurface sampling interval. At the <br /> top of each casing is a monitoring port consisting of a PVC labcock <br /> with a 1/4-inch hose barb fitting. <br /> 5 <br />