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5. Tailing Delivery Line <br /> The tailing delivery line will be a 42-inch diameter reinforced con- <br /> crete bell and spigot pipeline. It will be laid at a grade of 12-feet <br /> of fall per thousand feet (1.2%) . Drop structures will be 96-inch dia- <br /> meter reinforced concrete pipe. This tailing line will be laid on an <br /> unused highway grade for the first 20 years of operation to lessen the <br /> possibility of a tailing spillage into Tenmile Creek. <br /> 6. Highway Relocation <br /> Existing Colorado State Highway 91 will have to be inundated by May- <br /> flower Tailing Pond; therefore, Climax is having the State construct a <br /> new improved highway at Climax's expense. <br /> By October, 1978, the 4.4 mile relocation of Colorado Highway 91 will <br /> be complete, allowing scheduled deposition on the Mayflower facility. <br /> Total consideration for highway safety design and environmental plan- <br /> ning are an integral part of the project. Safety designs include two <br /> driving lanes, a passing lane, and paved shoulders for the entire length <br /> of the route, reaching a maximum grade of 6.5%. Approximately 1.4 million <br /> cubic yards of excavation is required with a cut:fill ratio of 1.2:1. The <br /> excess fill material will be used in the construction of parking lots at <br /> Mayflower Gulch, to provide access parking for cross-country skiers and <br /> summer backpackers into the popular area, and at the Clinton Reservoir, <br /> for fishermen and hikers. <br /> The environmental standards that will be enforced during the project are <br /> to Vail Pass standards. More than 43,000 cubic yards of topsoil are being <br /> stockpiled for eventual reclamation of the disturbed slopes and cut banks, <br /> allowing conventional revegetation. <br /> With emphasis being placed on the water quality and fishery habitat in upper <br /> Tenmile Creek, extreme care was taken with the placement of a 550-foot long <br /> culvert beneath the highway fill. This culvert was equipped with baffles to <br /> allow fish migration into the upper Tenmile for spawning. <br /> Special design considerations will open new vistas of the Mayflower and <br /> Clinton basins, and direct the western view away from the tailing area onto <br /> the mountain ranges beyond. <br />