2012-07-10_GENERAL DOCUMENTS - C1981041

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the refuse pile. Stability analyses performed by a consultant to the operator established "critical levels" for each of the thirty piezometers, which if exceeded, are to be reported by the operator, and may necessitate further stability evaluation and possible remedial measures. Critical level for each piezometer is listed in permit Table 18 -4. All water from mine operations that is pumped through the mine workings before being discharged at the surface is to be tested annually for a full suite analysis (Table 18 -2, "Annual Surface Water Monitoring Parameters "). 2. The permittee will conduct monitoring of surface water in a manner approved by the Division. The monitoring plan was submitted under 2.05.6(3)(b)(iv) and (4.05.13(2)). Surface water monitoring locations are shown on Exhibit 56 in the permit. Surface water monitoring will include sediment pond discharge, mine water discharge, flow from Cottonwood Creek, Rapid Creek and Coal Creek. Monthly monitoring of Jerry Creek was discontinued in September 2011 with the approval of TR -62. Annual monitoring of four springs and seeps within the permit area was conducted for 10 years, but was discontinued in 2006, pursuant to TR -50. Snowcap's current CPDS permit, effective 2/1/12, only requires that the sediment ponds have a Sediment Control Plan approved by the Colorado Division of Reclamation, Mining and Safety. No other monitoring or limitations are applied. This specification is noted on revised Table 18 -1 (PR -5). The operator's CDPS permit includes one active dewatering point (Outfall 016) and one back -up point (Outfall 002). Mine water discharge volume is measured by flow meter. Water quality of the mine discharge water will be tested annually for parameters listed in Table 18 -2. CDPS monitoring parameters and frequencies for mine dewatering sites are listed in Table 18 -1. Whole effluent toxicity testing was conducted quarterly at these sites until 2005 when, through an amendment process, the CDPHE determined that termination of WET testing at these sites was allowable. Former Site 015 at the 2 -West Portals is inactive, and was never used. The 2 West Portals have now been sealed. Discharge Site 001 at the South Portals has been fully reclaimed, and Discharge Site 004 at the North Portals has been inactivated, and the North Portals have been sealed and backfilled Ponds 1 and 2, Outfalls 009 and 010, have been fully reclaimed and have received Phase I, II and III Bond Release with SL -7 on April 26, 2011. Outfalls 001, 004, 009, 010 and 015 are no longer included in operator's CDPS permit. Flow volume will be monitored at flume installations on Rapid Creek and Cottonwood Creek at the following locations; SWGS -02 -- located on Cottonwood Creek in the NE 1/4 SE 1/4 Section 12, immediately upstream of No. 3 South Mains, SWGS -03 -- located on Rapid Creek in the SE `/ NE % Section 7, and SWGS -01 -- positioned on Rapid Creek downstream of the confluence with Cottonwood Creek. Flow at SWGS -02 and SWGS -03 will be recorded bimonthly during low flow (June through November). Flow measurements on SWGS -01 will be collected with continuous flow recorder when the creek is not frozen. Monitoring of Coal Creek and Jerry Creek was initiated in 1995. In 1999, monitoring requirements were reduced to downstream stations SWGS -06 on Coal Creek and SWGS -08, on Jerry Creek. The ephemeral flow in Coal Canyon will be monitored at the "dip section" culverts located between CRDA -1 and CRDA -2. The intermittent flow of Jerry Creek was measured at a culvert near the Highline Canal, a short distance upstream from the creek's confluence with the Colorado River. Instantaneous flow will be measured quarterly at the culverts, for which flow ratings have been provided. Monitoring of Jerry Creek, SWGS -08, was discontinued in Permit Revision No. 5 27 July 10, 2012