1989-10-10_REVISION - M1988112 (16)

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In preparing the work sequence, the necessity of obtaining • borrow from mandatory excavations within the disposal area and areas subsequently requiring fill placement shall be considered. Synthetic liner placement shall be coordinated with subsequent drain pipe installation, liner bedding placement, starter berm and cell berm construction, and drain fill operations. The following is a suggested general work sequence for constructing the facilities shown on the Drawings. It is intended as a guideline for the Contractor to develop his own work sequence in conjunction with that of the Owner to suit construction equipment and manpower scheduling and meet design requirements. Additional activities required to complete the work, as outlined within the Specifications and as shown on the Drawings, shall be added by the Contractor. Should the Contractor develop a sequence which would be more acceptable to the Owner, Engineer and himself let him present it. • ~ Develop access roads to work areas, as needed. • Develop a site drainage plan and maintenance scheme. • Construct the diversion ditch above the disposal area to route upstream storm runoffs around the facilities. • Remove topsoil from the facility area and place in stockpiles outside the ultimate disposal area limits. • Prepare the embankment and tailings disposal area foundation areas for liner installation. • Install synthetic liners within prepared disposal area where construction traffic is no longer required. Liner placement shall be done in segments, as approved by the Engineer, to minimize construction traffic over the liner to install the drain systems and berms. • Install drain pipes, liner bedding material, and the main and splitter berms over the synthetic liner. • Construct the lined collection pond facilities. • Construct the lined collection ditch and berm from the • embankment to the pond. 8