2011-11-08_PERMIT FILE - C1981041A (5)

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The Operators discharge permit No. CO- 0027146 included 5 mine dewatering discharge points. Outfall 001 (inactive) was located on the southeast bank of the Colorado River under the conveyor suspension bridge. Outfall 002 is located on the southeast bank of the Colorado River approximately 1200 feet north of Outfall 001. Outfall 004 (inactive) discharged to Coal Canyon near the Roadside North Portals dip section and allowed discharge of Roadside North Portals inflows after being routed through pond 12 (reclaimed). Outfall 015 (inactive) was permitted at the Roadside South Mine's 2 West Portals. Discharge from 015 would be to an unnamed canyon leading to the Colorado River. Outfall 016 is located at the North Decline and is shown on figure 14 -8 Mine inflows fill abandoned portions (Northwest Intake Pool) of the Roadside South Portals to an elevation of approximately 4757 feet. Water is gravity discharged from the mine through outfall 016 to prevent water from reaching the old Northwest Intake Portals. See Figure 14 -6 Roadside South Portal Mine Water Discharge System, Figure 14 -7 Roadside South Portal Dewatering Schematic and Figure 14 -8 Mine Dewatering Plan & Profile. Outfall 016 is the primary dewatering point for the mine. The Northwest Intake Siphon, Outfall 002, with a capacity of about 220 gpm is a backup mine dewatering system. As a backup system, the siphon will be able to handle the majority of the flow if the North Decline gravity dewatering system requires maintenance due to decreasing flow capacity. Flow meters are installed on mine discharge points to accurately measure quantities of water being discharged. Water quality of the mine discharge water is tested annually using the list shown on Table 18 -2 for Surface Water. Monitoring on Rapid Creek and Cottonwood Creek was initially discussed in the Plan for Surface Water Monitoring of Rapid and Cottonwood Creeks and a Contingency Plan for Rapid Creek submitted January 28, 1983, Stipulations Response 4 and 5. A minor revision (MR01) in March 1983 extended the compliance date for SR04. Crest stage gauges were installed at three (3) of the monitoring sites according to minor revision MR02 in that year. In 1986, technical revision TR09 eliminated monitoring on SWGS -04 and reduced monitoring on SWGS -02 and 03. Flow measurements will be taken bimonthly on SWGS -02 and 03 during periods of low flow (June through November). Flow measurements on SWGS -01 will be taken with a continuous flow record when the creek is not frozen. TR -62 18 -2 Rev 07/11