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6.0 WEST MINE AREA DRAINAGE SYSTEM REPAIR AND MAINTENANCE <br />b.l Description <br />This specification covers all work required to repair and reestablish proper <br />drainage control at the reclaimed west mine area mine site, and to perform two <br />additional complete maintenance operations at the west mine area during the <br />term of the East mine area reclamation project. <br />6.2 Execution <br />The CONTRACTOR shall, within i0 calendar days after receiving the Notice to <br />Proceed, perform a complete drainage control system repair and maintenance <br />operation at the west mine area shown on Exhibit 1 in accordance with the <br />specifications and performance standards provided in Section 6.2.A below. <br />This work shall be completed within 5 calendar days after work has begun„ The <br />CONTRACTOR shall also perform two additional complete drainage control system <br />repair and maintenance operations at the west mine area during the term of the <br />East mine area reclamation project on two separate dates to be specified by <br />the PROJECT MANAGER. <br />A. Repair and-Maintenance Performance Standards <br />The general configuration of the drainage control system at the west <br />mine area is shown on Exhibit 1. Items to be repaired and maintained <br />consist of the north and south of highway drainage ditches along old <br />State Highway 133, the drainage ditch running along the north side of <br />the railroad trucks, and drainage culverts CMP-1, CMP-2, CMP-3, and <br />CMP-8. The portion of each drainage ditch to be repaired and <br />maintained consists of the entire length of each ditch situated <br />between the east and west boundaries of the regraded west mine area, <br />shown as the area between cross section lines C-C' and N-N' on <br />Exhibit 7. Ditches shall be cut, regraded, and cleaned out as <br />necessary to form a V-shaped ditch with maximum 2h:ly side slopes and <br />a minimum depth below highway pavement and rail track of 1.5 feet. <br />However, ditch depth can be field adjusted plus or minus 6" as <br />necessary to provide an even ditch gradient capable of adequately <br />carrying runoff to the culvert inlets. <br />All ditch segments running to a culvert inlet shall be shaped and <br />graded as necessary such that all runoff contained in the ditch is <br />routed into the culvert inlet, ALL culverts shall be cleaned out to <br />contain no more than 10~ accumulated sediments and other debris. <br />Riprap linings established around the inlet ends shall be repaired <br />and maintained as necessary to allow adequate routing of runoff into <br />the culvert and to prevent erosion and scouring around both the inlet <br />and outlet ends. Sediments cleaned from the ditches and culverts <br />shall, prior to the late fall seeding, be hauled to and placed evenly <br />along the steep regraded slope situated immediately south of the <br />highway at the eastern extremity of the regraded area. After the <br />area has been seeded, sediments shall be hauled to the East mine area <br />and blended into regraded areas. <br />-26- <br />