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Exhibit L <br />• ON-SITE DISPOSAL <br />Clean and inert structwal demolition material generated within the Rio Grande permit azea will be <br />backfilled into the unreclaimed pit, along the main conveyor corridor located nearest to the plant site <br />(Years one and six of the Mine Plan, Exhibit D-1). This material will be buried according to the <br />requirements of Rule 3.1.5(9) of the CMLR Construction Materials Regulations. Approximately 45,000 <br />cubic yards of material will be backfilled into the excavated pit. This area will remain open until all <br />mining is complete, and, upon final reclamation, the conveyor will be dismantled and sold leaving an <br />open pit with an approximate volume in excess of 300,000 CY. The unsalvageable, clean and inert <br />materials from plant demolition will be buried in this last remaining pit. <br />As illustrated by Exhibit L-2, the clean demolition materials will be placed in the bottom of the pit in <br />layers and compacted. A dozer will work with the compactor to break up material and fill in voids while <br />maintaining a level fill area. Once the demolition materials aze placed, the remaining volume will be <br />backfilled with a minimum of 10 feet of cover over the fill and contoured according to the final <br />reclamation plan shown by Exhibits F-1 and F-2. The resulting configuration will be compatible with the <br />proposed post-mining land use of short grass prairie and rangeland (Exhibit L-2). Because the materials <br />will be clean and inert, buried at least 10 feet deep, and compacted, other future land uses may be <br />considered as well. <br />• <br />• <br />1180-Mine Permit Exhibits (Ju1.03.02)FINAL L-2.5 <br />July 23, 2002 <br />