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~ '.1 ` RAYE & ASSOCIATES 976 WELCH COURT ~ GOLDEN. COLDFADD 80401 ~ 13031 234-9855 Plarch 23, 1984 Mr. Dan Mathews Reclamation Specialist Colorado Mined Land Reclamation Division 1313 Sherman Street, Room 423 Denver, Colorado 80203 Re: The Rockcastle Company -Abatement Plan Grassy Gap Coal Mine - Pond 1 Dear Dan: RECEIVE® fv1AR 2 G 1984 MINED LAND RECLAMATION DIVISION Colo. Dept. of Natural Resources Per David Shelton's letter of March 6, 1984, The Rockcastle Company is required to submit two plans: an interim plan for dewatering Pond 1 at appropriate inter- vals and a long range plan for Pond 1. The plans are given below: Interim Plan: To prevent possible overtopping at Pond 1, The Rockcastle Company will position a 2" (or larger) portable pump at Pond 1 as soon as the pond is accessible. The pond will be discharged directly to Grassy Creek. Water qual- ity samples will be taken to document the quality of water being discharged. The pond will be checked daily and pumped on an as-needed basis to maintain the water level 4' or more below the top of the pond. Long Term Plan: About July 1, 19$4, The Rockcastle Company will conduct a vege- tation cover survey to determine percent cover at Pit 1. Sampling procedures outlined in the permit application will be used. By August 1, The Rockcastle Company will submit results of the vegetation cover survey and sediment genera- tion and runoff calculations to the Division. 4Jater quality and quantity (quan- tity when measureable) will be determined for inflow and discharge at Pond 1. Samples of runoff from adjacent undisturbed drainages will be taken for compar- ison purposes. The calculations, samples, and comparisons will be used to doc- ument whether or not Pond 1 can be eliminated. If Pond 1 cannot be eliminated in compliance with Rule 4.05.6(9), The Rockcastle Company will submit a detailed plan including design drawings for bringing Pond 1 into compliance with the runoff and storage requirements of Rules 4.05.6(3)(a) and (b) and the dewatering and spillway requirements of Rules 4.05.6(3)(c), (d) and (e). This plan will be submitted by August 15, 1984. Any necessary spill- way or dewatering installation, pond enlargement or pond elimination (if allowed) will be completed by October 15, 1984. I hope these plans meet the requirements of David Shelton's letter. Thank you for working with The Rockcastle Company toward a solution to the problems en- countered at Pond 1, If you have any questions, please call. Very truly yours, Tommy D Ray ~`-~~ cc: Bob Sherman Mark Korb Progress Within Environmental Tolerances