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There will be no measurement for payment for transportation, placement or compaction <br /> of backfill materials. Payment for these portions of Task 4 will be reflected under Item <br /> 4 on the Bid Schedule. This bid will cover all costs for transportation of backfill <br /> materials, selective placement and compaction of the backfill materials. Payment shall <br /> be as this task is completed and approved by PROJECT MANAGER. <br /> TASK 5 CONSTRUCT DRAINAGES <br /> In order to accommodate the discharge from the Rock Tunnel, a drainage will be <br /> constructed to convey this water to Dutch Creek. A second drainage will be <br /> constructed on the Rock Dump Waste Pile immediately south of Dutch Creek (Map <br /> Project Area). <br /> Rock Tunnel Channel <br /> An approximately 700 feet long drainage will be constructed from just north east of the <br /> current location of the Lamp House, across Road B, then west and down a slope to a <br /> confluence with Dutch Creek. The channel will be armored by durable rock rip rap in <br /> order to accommodate the quantity, quality and duration of the discharge. <br /> The channel will be constructed in two segments. The first segment will extend from <br /> just north east of the current location of the Lamp House to just south of Road B; a <br /> distance of 200 feet. The channel will be trapezoidal in shape, having a three (3) feet <br /> bottom width and side slopes no steeper than 4H:1 V. The minimum depth of the <br /> channel shall be two (2) feet as measured from the bottom of the channel to the <br /> adjacent ground surface. The channel bottom will have a slope of 2.3 % throughout <br /> this segment. <br /> The second segment will begin just south of Road B, and will continue to the <br /> confluence with Dutch Creek; a distance of approximately 450 feet. The channel will <br /> be trapezoidal in shape, having a three feet (3') bottom width and side slopes no <br /> steeper than 4H:1 V. The minimum depth of the channel shall be 2.5 feet as measured <br /> from the bottom of the channel to the adjacent ground surface. These dimensions must <br /> be achieved after placement of rip rap. The channel bottom will have a slope of 2.7 % <br /> throughout this segment. <br /> The second segment from the end of the low water crossing (see below) to the <br /> confluence with Dutch Creek shall be rip rapped. Rip rap shall consist of durable rock <br /> material averaging four to six inches (4" to 6"), as measured across the long axis of any <br /> single rock, will be placed within the channel at this location. The rip rap will extend <br /> from side to side of the channel (side slopes and base). Durable rock is defined as <br /> angular granitic rock, limestone or other highly altered rock materials. Slightly <br /> metamorphosed sandstone or shale, or rounded rock is not acceptable. <br /> A low water crossing (Figure 5, Low Water Crossing) measuring ten feet (10') in length <br /> (parallel to the channel axis) will be constructed at the point where the channel crosses <br /> Road B. The base of the channel will be widened to five feet (6), and the side slopes <br />