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1 <br />1 <br />e <br />0 <br />5 <br />5. When a sufficient length of sand (about 60 feet) has been spread 30 to 35 feet <br />above the previous barrier location, place 16 ounce geotextile or friction pad at <br />the edge of sand to protect the geomembrane. Prior to placing the geotextile, <br />clean any sand away which would be under the geotextile. The geotextile should <br />be placed parallel to and about a foot downslope of the upper penetration pipe <br />location. <br />6. Relocate the crane to the upslope edge of the solid waste filled area. Using the <br />crane with adequate spotters and placement personnel, gently set the traffic <br />barriers over the protective geotextile. The traffic barriers have interlocking <br />tongue and groove joints, and may need to be positioned using guide ropes. <br />7. Pipe sand behind traffic barrier to a minimum height of 3 feet. Remove end cap <br />from current level pipe penetration. Save cap for future use to permanently close <br />the penetration pipe. <br />Segment 2 Partial Closure Letdown System <br />As part of the infill segment construction, eight letdown pipes will be installed around <br />the perimeter of Segment 2 (north, east, and south sides) to deliver stormwater from the <br />bench terraces to the perimeter ditch. The ditch is being widened to a 12 -foot bottom <br />width on the north side of Segment 2 and to a bottom width of 15 feet on the east and <br />south sides. <br />The letdown system consists of two riser inlets at each terrace. These inlets connect to a <br />24 -inch HDPE letdown pipe (SDR 32.5) via 12 -inch HDPE pipe. Riser inlets are 30 -inch <br />diameter pipe, 36 inches high, and have aluminum edge frames for strength. Each riser <br />pipe is installed with a thrust block to provide stability. The area where the letdown <br />„O„ F-30 <br />