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• In 1996, Henderson constructed a water treatment facility at the site of the <br /> historic Urad Mine in the Wood Creek Valley to collect, consolidate, and treat <br /> water from both the active underground mine and the defunct Urad Mine. <br /> Henderson determined that an alkaline precipitation system producing High <br /> Density Sludge (HDS; 25 % solids or greater) would meet the revised effluent <br /> limitations of their CPDES discharge permit. This treatment facility was <br /> commissioned in 1997, and has been successfully treating this mine water since <br /> start-up. <br /> This proposed TR to the Permit seeks to attain approval from the DMG to <br /> dispose of the dewatered HDS produced in the water treatment process in Pond <br /> 1.2 at the Henderson Mine site. The TR discusses characterization of the HDS, <br /> the adequacy of Pond 1.2 to safely store the HDS, flood control and <br /> management issues, and a final cover design and surface reclamation of Pond <br /> • 1.2. <br /> This TR meets the required information submittals of the Minerals Rules and <br /> Regulations of the Colorado Mined Land Reclamation Board (Rules) and <br /> includes discussions that respond to the issues presented in a memo to <br /> Henderson (Ms. Anne Beierle) from Mr. Allen C. Sorenson of the DMG dated <br /> November 19, 1998, A copy of this memo is provided in Appendix A. <br /> 2.0 THE TECHNICAL REVISION <br /> A Designated Mining Operation (DMO) is defined by Rule 1.1 (14) as a mining <br /> operation at which: 1) designated chemicals used in the metallurgical <br /> processing are present on-site; or, 2) toxic or acid-forming materials will be <br /> exposed or disturbed as a result of mining operations; or, 3) acid mine drainage <br /> • pEgrr <br /> 2 <br /> JUro 23.1999 <br /> TR.mc <br />