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ry Y <br />•,J <br />Memo to Mike Long - 2 - October 20, 1989 <br />8. Revegetation must be accomplished. <br />9. Some amount of maintenance will be required as evidenced by the gullys <br />which have appeared in the 3H:1V slopes on the northwest side of the <br />initial cut spoil pile. <br />Cost for this reclamation would vary significantly depending on many factors <br />including: <br />1. Final slopes (2H:1Y vs. 3H:1Y). <br />2. Engineering practices needed to assure stability of slopes steeper than <br />3H:1V (terraces, benches, contour furrows, etc.). <br />3. Availability of material above the east pit's east highwall for use as <br />back fill and/or final cover material. <br />4. The quality of the spoil material in overburden stockpiles. <br />The final two cost estimates are based on the following assumptions: <br />1. All necessary back fill material can be obtained from spoil piles on <br />center ridge and the northern nose of center ridge, and overburden <br />stockpile number two (near where the East Pit daylights). Cost of <br />transporting and placing this material would be about 70 cents per <br />compacted cubic yard. <br />2. The east highwall at the East Pit cannot be pushed down. <br />3, Final slopes are either 3H:1V or 2H:1V. <br />4, Approximately 6 inches of cover material is applied. <br />5, Standard reclamation practices of fertilization, seedbed preparation, <br />seeding, and mulching are carried out. <br />If 3H:1V slopes are used: <br />1, Approximately 750,000 cubic yards must be moved at a cost of E525,000.00. <br />`~ ~fo~~5~90 <br />2, Approximately 37,900 cubic yards of topsoil must be moved to cover <br />approximately 47 acres at a cost of 526,500.00. <br />3. Approximately 47 acres must be revegetated at a cost of E28,200.00 <br />(5600/acre). <br />4. Stream channel reconstruction costs would be approximately E35,000.00 <br />(see Feb. 10, 1987 memo by Jeff Deckler). <br />5. Total cost would be approximately b615,000,00. <br /> <br />