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• The Operators discharge permit No. CO-0027146 includes 5 mine dewatering discharge points. Outfall 001 is 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 (now 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 Operator has two backup mine dewatering systems. The first is the siphon installed at the Northwest Intake. Water would discharge from the siphon through outfall 002. The second backup system is a 4-inch diameter pipe from the updip No. 2 South Mains Sump to Outfall 001. 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 I• 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. VOL 5 Tab 18 18-2 5/03