2008-11-17_GENERAL DOCUMENTS - C1981015 (3)

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PROJECT WORK DESCRIPTION Task 1 Mobilize and Demobilize Crew and Equipment Measurement and Payment Payment for Task 1 shall be reflected in a lump sum bid price under Item 1 on the Invitation and Bid sheet. Payment shall include all the CONTRACTORS expenses for mobilization of equipment to the site, transportation of the equipment within the Project Area, employee time, labor and materials necessary to accomplish the requirements of this Task, compliance with the conditions and requirements described in this Task description, and final clean up of the work place. If the price bid for mobilization and demobilization is greater than 15 percent (15 %) of the total contract price, invoices supporting the mobilization costs will be required before payment is approved. Payment shall be made as described in Specification 1.0, Mobilization / Demobilization of the General Bid Specifications, Colorado Inactive Mine Reclamation Program, 2006. Task 2 Sediment Pond Maintenance: The sediment pond was constructed within the margins of the ephemeral stream which drains through the mine site. The sediment pond is in need of repair in order allow flood waters to safely pass the existing embankment. The 30" Corrugated Metal Pipe (CMP) riser located in the sediment pond must be cut and removed at the base. The 30" CMP pipe and associated items will be disposed of in an approved landfill or salvaged by the CONTRACTOR. The underground portion of the 30" pipe will be plugged with concrete to a length of 4 feet. The concrete shall consist of Type II Portland Cement, conforming to ASTM C 150, unless otherwise approved by the PROJECT MANAGER. The existing emergency spillway on the west side of the pond will be lowered 2 feet and lined with rip -rap obtained on site. The rock will be collected by the CONTRACTOR at a location specified by the PROJECT MANAGER. The channel will remain trapezoidal in shape with 2.5H:1 V side slopes. The spillway dimensions are approximately 50 feet long by 8 feet wide (bottom width). The spillway will need to be lined with rip -rap for a length of 75 feet starting from the inside of the channel and down the spillway where it enters the existing channel marked by the PROJECT MANAGER. Rip rap, available on site, will consist of 12" to 18" diameter rock. Placement will be such that voids will be eliminated with rock contacting rock. The rock will be keyed in place at the beginning of the spillway to a depth of 3 feet and keys constructed on 20 foot centers with the last key at the end of the spillway. Side slope rip rap will extend up the sides of the constructed channel to a minimum 4 feet height above the channel base. Measurement and Payment There will be no measurement for payment of Task 2, Sediment Pond Maintenance. Payment for this Task will be reflected in a lump sum bid under Item 2 on the Bid Schedule. This lump sum bid will cover all costs for excavating, hauling, placing and rip -rap lining as described in these specifications. 5