1993-11-15_GENERAL DOCUMENTS - C1981017 (2)

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STATE OF COLORADO MINED LAND RECLAMATION DIVISION Department of Natural Resources Fz�s:�10 1313 Sherman St., Room 215 *, Denver,CO 80203 303 866-3567 ** FAX. 303 832-8106 �876 _ January 7 , 1991 Roy Romer, Governor Mr. Lew Thom son Fred Banta. p Division Director Environmental Supervisor Mid-Continent Resources, Inc. P.O. Box 500 Carbondale, Colorado 81623 RE: Coal Basin Mines (C-81-017) , Small-Area Exemption Demonstrations Dated December 11 , 1990. Dear Mr. Thompson: The Division has reviewed these demonstrations and finds that the following issues must still be addressed: Mid-Continent must demonstrate either that the 10-year, 24-hour runoff from each area will be contained by a berm or other treatment facility, or that the runoff from each area is a non-point source discharge and can therefore be exempted from sediment control requirements. The first option would require that runoff calculations ano a structure design be submitted for each area, to be reviewed by the Division. For the second option, it is recommended that you contact the Water Quality Control Division concerning whether non-point source designations are appropriate for these areas. There are also some inconsistencies in the submittal : - Exhibit B appears to be an example Findings Document page, which is not necessary as part of this submittal . - Area No. 4 in Exhibit A is listed as Area No. 3 in Exhibit B. - Area No. 3 in Exhibit A is not listed at all in Exhibit B. It is also not mapped in either this submittal or in the permit application. The calculations for this area (0,62 acres) can't be verified for these reasons. - Statement 2 of the cover letter is not true. With correction of the above issues, the demonstrations for alternative sediment control will be approved. Sincerely, William B. Crick Reclamation Specialist WBC/scg cc: Mike Savage 2616F