1998-01-20_REVISION - M1977342 - Laserfiche WebLink

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• The lower flood bypass system can be used to bypass all runoff, including runoff from the West Branch of Ute Creek and the main branch of Ute Creek below Ute Creek Dam, or diverting the runoff into the tailings impoundment. Water in the tailings impoundment is decanted to the Ute Park pump station through the decant line. Reclaim pumps in the Ute Park pump station pump the reclaimed water up to the East Branch Reservoir. The capacity of East Branch Reservoir is approximately 2060 acre- feet of mill process water. By reclaiming water from the tailings impoundment and recycling it to the Mill, a close-circuit system is created. The Henderson Mill CPDS Permit (CO-0000230) was issued by the Colorado Department of Public Health and Environment in 1991. The permit controls emergency release of process water in the event of unexpected large magnitude precipitation events occurring in conjunction with an unexpected low production period during which water is not consumed and storage is at capacity. This condition has occurred three times during the period 1979 through 1997. Each time, water was released in compliance with conditions of the permit. • In addition to the water rights currently in use for water supply systems, Climax Molybdenum Company owns several additional senior rights in the Williams Fork River basin. These rights were originally decreed for agricultural use and were historically used to irrigate various ranches located in tributary drainages downstream from the Mill. Climax has applied for a change of use for these rights to enable the use of them to meet potential, additional water demand that could arise as a result of the Henderson 2000 project. A total of 11 culverts will be constructed or extended along the PC3 Conveyor route or access road alignments where the conveyor intersects drainage courses. Two existing culverts located on streams adjacent to the Ute Creek Trail as it crosses the railroad embankment will be extended approximately 75 feet. BMPs (Best Management Practices) to control velocities will be incorporated into the design of the culvert extensions and the remaining nine new culverts that will be installed along the alignments. Erosion and sediment control is address in a stormwater managmement plan for the project as required by the Colorado Department of Public Health and Environment. BMPs will include, but not be limited to, utilizing silt fences, hay/straw • bales, check dams, and sediment ponds during construction activities.