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storage yard and surrounding area. This location takes advantage of the steep cut <br />bank for disposal and cover, allowing debris disposal while bringing the cut slope <br />back to more natural grade and appearance. <br />The coal yard site is approximately 600 feet by 550 feet or 7.5 acres. The vertical <br />component of this site is approximately 50 feet. Preliminary assessments by <br />Henderson mill personnel indicate that this disposal location is large enough to <br />accept all suitable debris from the mill and portal areas. Aside from the <br />advantage of using this site to fill a cut slope highwall, use of the coal yard area <br />allows for downhill dozing of cover material. <br />The second disposal site on the mill side is the present onsite landfill at the <br />tailings impoundment. This landfill is located just southwest of the tailing pond <br />shop building. Presently, the landfill is approximately 150 feet by 50 feet or 0.17 <br />acres. In its current configuration, there is about 20 feet vertical available for non- <br />hazardous solid debris. However, this site has significant potential for expansion <br />if additional space is needed. Obviously, the principal advantage of this location is <br />that it is an existing solid waste landfill that will require cover and reclamation on <br />termination of operations. <br />3.2.2 Materials Testing and Burial <br />Only non-hazardous solid demolition materials will be disposed on Henderson <br />property. A materials testing regimen similar to that approved by DMG and the <br />Colorado Department of Public Health and Environment (CDPHE) and used at the <br />CMC Climax Mine (Climax) prior to on-site disposal of demolition materials wilt be <br />incorporated at Henderson. Materials testing will include certification that the <br />demolition materials are free of friable asbestos and PCBs. Composite samples <br />of each batch of materials for disposal will be tested for lead (lead-based paints) <br />and other RCRA metals using standard TCLP or sulfuric acid leaching <br />methodologies. Batches testing positive will be decontaminated prior to burial. <br />However, experience at Climax has shown that such construction materials <br />consistently and easily pass leach testing and are non-hazardous. <br />Burial sites at the mill side are located to protect surtace and ground water. The <br />sides and bottom of the repositories will be constructed of relatively impermeable <br />materials. Any free-draining aggregates will be protected from clogging from <br />infiltration of fine-grained materials using a geotextile wrap or some other suitable <br />technology. <br />5 <br />