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f <br />• • <br />COOLEY RESERVOII2 AND FULTON WILDLIFE AREA PIT <br />(Revised 07/09/99 <br />EXHIIiIT L -RECLAMATION COSTS <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 any one time. This would occur when Phase 1B was mined and being used as the recipient of the <br />Plant Site's water (no topsoil replacement having been undertaken), the second half of Phase 2 and <br />the first half of Phase 3 still needing slope backfilling and topsoil replacement, Phase 1 B and all of <br />Phases 2 and 3 needing to be revegetated, and the conveyor across the S. Platte River and the Plant <br />Site's facilities needing to be removed. This would be after Phase lA had been reclaimed and <br />revegetated, and before any mining had been initiated in Phase 4. Based on this assumption, the <br />reclamation costs would consist of the following: <br />l.. Phase 2-4 <br />Slurry Wall- At any one time, 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- Bacldill of the entire Phase 1B slopes (192,210± 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 572,260± cubic yards of material. All material necessary for <br />backfilling will come from on-site sources that will be stored in the 35' setback <br />and other areas on the site. <br />3. Topsoil- Topsoil the Phase ]B slopes (6,550± cubic yards), the last half of Phase 2 <br />slopes (5,993± cubic yards), and the first half of Phase 3 (8,084± cubic yards), <br />or 20,627+ cubic yards of material. All material necessary for topsoiling will <br />come from on-site sources from either material stored in the 35' setback or <br />in designated reserve topsoil stockpile areas on the site. <br />4. Revegetation- Revegetate all of Phase 1 B (25± acres) and all disturbed non-lake areas of <br />Phases 2 and 3 (17.5+ acres), or 42.5± acres. <br />