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U6/30/99 WED 14:31 FAX 303 452 4515 ADCO/CREROAEE/BAI'ER <br />` ~ • • <br />,-. <br />EXHIBIT L -RECLAMATION COSTS (Revised 06/30/99) <br />For reclamation cost estimates, CAMAS is utilizing the cost to install the slurry wall through the <br />PSCo. right-of--way around all of Phases 2, 3, and 4 and the largest disturbance that would be possible <br />at arty one time. This would occur when Phase 1B was mined and being used as the recipient of the <br />Plant Site's water (no slope backfilling or topsoil replacement having been undertaken), the second <br />half of Phase 2 and the first half of Phase 3 still needing slope backfilling and topsoil replacement, <br />Phase 1B and all of Phases 2 and 3 needing to be revegetated, and the conveyor across the S. Platte <br />River and the Plant Site's facilities needing to be removed. This would be after Phase lA had been <br />reclaimed and revegetated, and before any mining had been initiated in Phase 4. Based on this <br />assumption, the reclamation costs would consist ofthe following: <br />1.. Phase 2-4 <br />Slurry Wall- At any one tune, the greatest extent of slurry wall construction would be <br />14,168'±. The proposed slurry wall is assumed to average of 33' deep using <br />an average depth of 30' to bedrock and penetrating 3' into the bedrock. For <br />the purposes of these calculations, however, I used a 35' depth. A 20% <br />contingency figure is used as a failure rate using the regulated construction <br />option. <br />2. Backfill- Bacld'ill of the entire Phase iB elopes (235,450± cubic yards), the last half of <br />Phase 2 slopes (161,800± cubic yards), and the first half of Phase 3 (218,250± <br />cubic yards), or 615,500± cubic yards of material. All material necessary for <br />backfilling will come from on-site sources that wilt be stored in the 35' setback <br />and other aeeas on the site. <br />Topsoil- Topsoil the Phase 1B slopes (8,720± cubic yards), the last half of Phase 2 <br />slopes (5,993± cubic yards), and the first half ofPhase 3 (8,084± cubic yards}, <br />or 22,797± cubic yards of material. All material necessary for backfilling will <br />come from on-site sources that will be stored in the 35' setback and other <br />areas on the site. <br />4. Revegetation- Revegetate Phase lB (25+_ acres) and all of Phases 2 and 3 (17.5± acres), or <br />42.5+ acres. <br />Other assumptions are as follows: <br />AU mining and processing will be done with portable equipmert. A $50,000 figure is assumed <br />to be sufficient to remove the conveyor support structures, the fuel storage containment azea, <br />and any other miscellaneous, as the portable systems and any left equipment DMG would <br />recover any other costs of removal through the sale of salvageable equipment. <br />f~j 003 <br />