1987-12-01_PERMIT FILE - C1981017 (107)

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` STATE OF COLORADO Roy Romer, Governor 187E `wVNt�-n (� /tea DEPARTMENT OF NATURAL RESOURCES 1lL MINED LAND RECLAMATION DIVISION DAVID C. SHELTON, Director May 13, 1987 Mr. Doug Bowman Environmental Coordinator Mid-Continent Resources, Inc. Box 158 Carbondale, Colorado 81623 Re: TR-08; Sutey Expansion, File No. C-81-017 Dear Mr. Bowman: I have completed my review of TR-08 for adequacy. Specific deficiencies are noted below and in the enclosed memo from Jeff Deckler. Map 2 of 2 does not show the location of the intake for the new sediment pond as shown on Map 1 of 2. Are cutoff collars to be utilized for the new sediment pond and, if so, what will be the spacing? I was interested to note the snow runoff index used in the USLE. Could you supply a reference for this index. From Map 2 of 2 it appears that only areas I, II, IV and V would flow to the new sediment pond and the west collection ditch. All other areas appear to flow to the east ditch and to the two existing ponds. Please clarify why the new pond was designed to hold all the runoff. The capacity of the existing ponds will need to be evaluated if part of the new acreage, as shown on Map 2 of 2, drain to these ponds. The east collection ditch will also need to be evaluated for adequacy of size if increased acreage is to drain to it. For the Phase I, 1987 Pond calculations, Map 1 of 2 should have the drainage areas labeled. The disturbed acreage given as 9.2 acres does not agree with Division estimates of greater than 12 acres. The acreages need to be verified. As noted previously, if the pile configuration of Map 2 of 2 is followed, some areas of Phase I, 1987 appear to drain to the existing sediment ponds. Therefore, the adequacy of these ponds would need to be evaluated. If you have any ouestions, please contact me. Sincerely, Candace M. Thompson Wdrologist CMT/7pj h 99 942 FCentennial Building, 1313 Sherman Street Denver, Colorado 80203-2273 Tel. (303) 866-3567