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limitations of Rule 4.05.2 and applicable State and Federal water quality standards for <br /> receiving streams and also due to the fact that no mixing of surface drainage from these areas <br /> with a discharge from underground workings will occur. The small areas to be exempted are <br /> listed in Volume 3, Appendix 13-3 of the permit application (4.05.2(3)(b)(i)). <br /> In 1997, Pond 12 was designed to act as a mine water treatment pond for the mine water <br /> discharge associated with the Roadside North Portal Mine, NPDES discharge point 004. <br /> Discharge from the North Portal Mine required pumping, which ceased in December 1999 <br /> when operations ceased. Outfall 004 has been discontinued and Pond 12 has been eliminated <br /> by reclamation operations. Pond 12 has received Phase III bond release and has been removed <br /> from the permit with the approval of TR-70. <br /> Discharge Outfall 015 had been approved for minewater discharge from the South Mine 2 <br /> West Portals. The outfall was never activated and the 2 West Portals have been sealed and <br /> reclaimed. Only two approved minewater discharge sites remain, both at the South Mine. <br /> Outfall 016, located near the North Decline Area is the primary dewatering site. Outfall 002, <br /> the siphon discharge system at the reclaimed Northwest Intake Portal, has been retained as a <br /> back-up discharge site that would be used in the event of malfunction of Outfall 016. Outfall <br /> 001, a supplemental/back-up discharge via 4" diameter pipe through the South Portal <br /> conveyor entry concrete seal, has been permanently plugged in association with South Portal <br /> area final reclamation in 2007/2008. <br /> The Division has granted an exemption from the use of sediment ponds for NPDES discharge <br /> points 002 and 016 from underground mine workings because sediments are settled out in <br /> abandoned underground workings before being discharged into the Colorado River. <br /> Additional ponds and treatment facilities are not necessary for these discharge points to meet <br /> the effluent limitations of Rule 4.05.2 and applicable State and Federal water quality standards <br /> for receiving streams. <br /> 23 <br />