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Pe_y PEASODY COAL COMPANY W~stom Dlvl~lon May 2, 1988 III IIIIIIIIIIIII III 999 1300 Souln Vale Glagatall, Arizona 86001 (602) T74-5253 x ~. `~ ~ Mr. Peter O'Connor ' °~~""~ `-~ ~~ Colorado Mined Land Reclamation Division ~;,AY 7 19x8 215 Centennial Building 1313 Sherman Street ~,A.IhiED LANL:j Denver, CO 80203 i~ECLAt„1P.TIOfV OI'JISIO~f RE: 1988 First and Second Quarter Sediment Pond Inspections, Seneca II and Nucla Dear Mr. O'Connor Following please find responses to your letters of January 26 and March 31, 1988 to Rey Armijo concerning quarterly sediment pond inspections at Seneca II and Nucla Mines. The format follows your letter of January 26, 1988 with reference to your letter of March 31, 1988, where appropriate. ~~~. Peabody concurs with CMLRD and will cease submitting inspections on Mesa Gravel Pit Impoundment No. 005. 2. Concerning Nucla Ponds 001, 002, 004, 005, and C06 the emergency spillways (i.e., drop inlet culverts) received trash racks after construction. The principal spillways are a trickle tube design with a single orifice opening. When the opening becomes very small (i.e., less than three inches in diameter) it is not very practical to put a fine mesh trash rack over the orifice. However, in response to CMRLD's request for a nonclogging principal spillway at Nucla, Peabody installed trash racks/screens the week of April 11, ot` 1988 on the following principal spillways: 002, 004, 005, and 006. Pond 001 had a trash rack installed on the principal spillway in 1987. In regards to comment No. 2 from your letter of March Or- 31, 1988, Peabody will continue quarterly sediment pond inspections for Pond 003 at Nucla. At Seneca, Peabody is proposing to dewater Pond 003 below the principal spillways in accordance with the NPDES permit, remove the old principal spillway, install a new principal spillway (i.e., 18-inch diameter CMP with a 6-inch diartieter opening and