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CRDA-01 through 03, and OIA; and thirty piezometers (Pz 100-107, 200-206, 300- <br /> 307, and 400-406), all on CRDA-I, were monitored quarterly for water level. <br /> "Critical levels"were defined for 100,200, 300, and 400 series piezometers. CRDA- <br /> 04 through 06 installed on CRDA-2, were monitored quarterly for water level. The <br /> thirty, 100 through 400 series piezometers on CRDA-1 were installed in 1994 at four <br /> locations to monitor water levels in multiple zones within the refuse pile. Stability <br /> analyses performed by a consultant to the operator established "critical levels" for <br /> each of the thirty piezometers, which if exceeded, are to be reported by the operator, <br /> and may necessitate further stability evaluation and possible remedial measures. <br /> Critical level for each piezometer is listed in permit Table 18-4. Monitoring of the <br /> CRDA piezometers was discontinued in 2015 with the approval of SL-8 and TR-67. <br /> The piezometers were abandoned and plugged in 2016. <br /> All water from mine operations that is pumped through the mine workings before <br /> being discharged at the surface is to be tested annually for a full suite analysis (Table <br /> 18-2, "Annual Surface Water Monitoring Parameters"). <br /> The permittee will conduct monitoring of surface water in a manner approved by the <br /> Division. The monitoring plan was submitted under 2.05.6(3)(b)(iv) and(4.05.13(2)). <br /> Surface water monitoring locations are shown on Exhibit 56 in the permit. Surface <br /> water monitoring will include sediment pond discharge, mine water discharge, flow <br /> from Cottonwood Creek, Rapid Creek and Coal Creek. Monthly monitoring of Jerry <br /> Creek was discontinued in September 2011 with the approval of TR-62. Annual <br /> monitoring of four springs and seeps within the permit area was conducted for 10 <br /> years, but was discontinued in 2006, pursuant to TR-50. <br /> Snowcap's current CPDS permit, effective 2/1/12, only requires that the sediment <br /> ponds have a Sediment Control Plan approved by the Colorado Division of <br /> Reclamation,Mining and Safety. No other monitoring or limitations are applied. This <br /> specification is noted on revised Table 18-1. The operator's CDPS permit includes <br /> one active dewatering point(Outfall 016) and one back-up point (Outfall 002). Mine <br /> water discharge volume is measured by flow meter. Water quality of the mine <br /> discharge water will be tested annually for parameters listed in Table 18-2. CDPS <br /> monitoring parameters and frequencies for mine dewatering sites are listed in Table <br /> 18-1. Whole effluent toxicity testing was conducted quarterly at these sites until 2005 <br /> when, through an amendment process, the CDPHE determined that termination of <br /> WET testing at these sites was allowable. Former Site 015 at the 2-West Portals is <br /> inactive, and was never used. The 2 West Portals have now been sealed. Discharge <br /> Site 001 at the South Portals has been fully reclaimed, and Discharge Site 004 at the <br /> North Portals has been inactivated, and the North Portals have been sealed and <br /> backfilled. Ponds 1 and 2, Outfalls 009 and 010, have been fully reclaimed and have <br /> received Phase I, II and III Bond Release with SL-7 on April 26, 2011. Outfalls 001, <br /> 004, 009, 010 and 015 are no longer included in operator's CDPS permit. <br /> Flow volume will be monitored at flume installations on Rapid Creek and Cottonwood <br /> 29 <br />