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<br />COLOWYO COAL COMPANY
<br />SOUTH TAYLOR RECLAMATION COST MODEL
<br />TABLE 6. OTHER HYDROLOGIC FEATURES
<br />
<br />DITCHES VOLUME
<br />(i.CY) UNIT
<br />COST COST PER
<br />TASK
<br />ACRES REVEGETATION
<br />UNIT COSTS RE VEGETATION
<br />COSTS
<br />TOTAL COST
<br />Section 28 Collector Ditch 2,200 $ 1.09 $ 2,398 1.8 $ 179 $ 322 $ 2,720
<br />Section 29 Collector Ditch 3,100 $ 1.09 $ 3,379 2.6 $ 179 $ 465 $ 3,844
<br />Sediment Traps (10) 48,400 $ L09 $ 52,756 3.0 $ 179 $ 537 $ 53,293
<br />Post Minin Stock onds (6) 7,300 $ ].09 $ 7,957 2.0 $ 179 $ 358 $ 8,315
<br />Post Mining Channel (Primary) 100,300 $ 1.09 $ 109,327 0.0 $ 179 $ - $ 109,327
<br />Post Mining Channel (Secondary) 38,300 $ 1.09 $ 41,747 0.0 $ 179 $ - $ 41,747
<br />Ri -Rap 113,000 $ 1.52 $ 171,760 0.0 $ 179 $ - $ 171,760
<br /> $ 0.0 $ 179 $ - $
<br /> $ - 0.0 $ 179 $ - $
<br /> $ - 0.0 $ 179 $ - $
<br /> $ - 0.0 $ 179 $ - $ -
<br /> $ - 0.0 $ 179 $ - $
<br />SabtotalOtherXydrologicFeatares 44,946 $389,324 9.4 $ 1,682 S 391,006
<br />Footnote 1: Although the bond topography differs from the postmine topography, the sediment control plan for the postmine topography uses a system of 3 ponds, 10 sediment traps, and 6
<br />postmine stockponds for a worst case hydrologic condition {See Exhibit 7, Item 20). This case would also be representative for the bontl topography although the number of strudures will vary with
<br />time. With this case, each of the 10 sediment traps have a maximum capacity of 2.0 acre-feet, resulting in a total yardage of 48,400 cY assuming 150°h of the total storage capacity for slope
<br />considerations. Estimated surface area for the 10 sediment imps is 3 acres.
<br />Footnote 2: As noted in Footnote 1, there are 6 postmine stockponds, each with a cepaGty oT 0.5 acre-feet. Using the same considerations, this results in a yardage of 7,300 cy and a surface area
<br />of 2 acres.
<br />Foofiote 3: As noted in Footnote 1, the postmine topography differs from the bond topography but the number and length of postmining channels was chosen as a representive case. See Tabte t,
<br />Fem. 7-20, Part E for a listing of primary and secondary channels for the postmine Surface. A total of 28,200 linear feet of pdmary channels with 12 foot bottom width, 3H:1V sideslopes, 4 foot depth
<br />and cross-sedional area of 96 square feel per foot are required. This results in 100,300 cy of excavation to censtmG the pdmary channels. Similady, the 28,709 linear feet of secondary channels
<br />results in 38,300 cY of excavation. Together, the primary and secondary require 138,600 cY or excavation. No additional surface area has been inGuded as ditches are within the main reGamation
<br />units.
<br />Footnote 4: An estimated 113,000 cubic yards of dp-mp material will be needed based on lengths and dimensions provided in Exhibit 7, Item 20 with a placement depth of 150% of the D50
<br />diameter. A unit cost of $1.52 per yard for dprap transport and placement is used assuming that adequate materials are available from overburden sources basetl on typical tmck/shovel unit costs
<br />of $0.76 times 200%to inGude extra handling and placement.
<br />Revision Date 4/18/07
<br />Table 6 Exh 13A-T6-1 Revision No. PR-02
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