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;~ -z- Calculations for runoff volume, sediment yield, and requirements for sediment storage are based on previous assumptions and calculations provided for the loadout area ponds. We feel the calculations are applicable since the physical characteristics are the same as those encountered for both the Gossard Pond (Discharge Point .003) and the Stoker Pad Pond (Discharge Point .005). Note, however, that we intend to construct a pond slightly larger than what the hydrology calculations indicate is required. The pond will hold both the 20-year or 25-year rainfall event when it is dredged to uesign capacity. Topsoil will be removed and placed at the existing topsoil storage pile for the Stoker Pad area. Excavated material from the proposed pond will be utilized as berm around the pond and construction of the ditch system. The ditch system modification will also use material from the side slopes of the existing ditch as shown in the ditch design submitted with this request. Any excess material excavated that is not required for berm and ditch construction will be hauled to the active mine dump or stockpiled for use at the loadout area. BOND The previously agreed upon operations plan for reclamation of the Gossard loadout area incorporated with earth moving and revegetation over top of the proposed pond location, therefore there is a sufficient amount in the existing bond to backfill and reclaim the proposed pond area. We would appreciate your earliest consideration in this matter. We would like to proceed with construction of the pond early this fall so that • the pond can be functional before the 1985 spring runoff. Also enclosed for your review is a Proposed Public Notice. ,; Sincerely, COLOWYO COAL COMPANY ~~~'~'~~ E.T. Moye Geologist/Reclamation Specialist ETM/yml Enclosures cc: L.B. Gray R.G. Atkinson Central Files n