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l <br />11 <br />practical effect be a monoculture. <br />This was probably not the intent of the standard, but some clarification is warranted, <br />and the application should be appropriately amended. The following approach would <br />be acceptable: <br />1) At least four principle species including a minimum of three cool season <br />perennial grasses and a minimum of 1 perennial forb shall be established. <br />2) Each principle species shall contribute no less than 3% relative cover. <br />3) No single species shall contribute in excess of 50% relative cover. <br />4) No four species in combination shall exceed 80% relative cover. <br />21. Please update the reclamation cost estimate to reflect an adjustment for 1995 costs. <br />Costs in need of adjustment include equipment, labor, structural demolition, <br />revegetation, and blasting. <br />22. Due to the volatility of the coal market, and the uncertainty of the quality of stored <br />coal at the mine operations, a Division policy was developed in 1993 regarding stored <br />coal on site. Coal mine operators are now required to submit a plan and post a <br />performance bond for removal of 50% of all coa[ stored on site, whether stockpiled <br />or in silos. Please include a plan and associated cost for disposal of 50% of the <br />maximum allowable amount (as indicated on the Department of Health emissions <br />permit) of any coal stored on site. <br />23. The Division recently incurred cost for pond cleaning that became necessary at a site <br />for which the performance bond had been revoked. As a result of this, it has come <br />to our attention that reclamation cost estimates should include costs for dredging of <br />ponds over the ten year liability period. Please review site specific data at Colowyo <br />to determine which ponds, if any, could reasonably be expected to need cleaning over <br />a ten year period, and how often they might need to be cleaned. Please revise the <br />reclamation cost estimate accordingly. <br />24. There were a few revisions to the permit that did not appear to be addressed in the <br />bond estimate. They are as follows; <br />a. There does not appear to be a cost for reclamation of the Section 16 <br />sedimentation pond in the current reclamation cost estimate. Please revise <br />the estimate to include reclamation of this structure. <br />b. The Division recently approved modification of the postmining topography of <br />the Section 15/16 pit area (Tlt-23). Please review the volumes of material <br />