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DEPARTMENT OF NATURAL RESOURCES ~tl ^I~~II~II1111111 David H. Getchea Ezecutive Director 999 MINED LAND RECLAMATION DIVISION DAVID C. SMELTON, Dlreetor Richard D. Lamm Governor DATE: July 11, 1986 T0: Mike Savage FROM: John T. Doerfer <J I" RE: SUBSIDENCE MONITORING, RED CANYON MINE, FILE N0. C-81-034 Grand Mesa Coal Company (GMCC) submitted their second semi-annual subsidence monitoring report for the Red Canyon Mine on June 20, 1986. Their proposal of July 30, 1985 was to survey only if major caving was observed underground in the mine. Jim Pendleton's review at that time was to have them continue monitoring for two additional quarters and to reassess their proposal based upon a review of the data. They have fully addressed each of the three comments contained in his September 9, 1985 memo, but have changed their proposal. This is to only monitor upon resumption of active mining, and then only quarterly for one year unless subsidence is indicated. I would suggest that the subsidence monitoring be continued during temporary cessation as an annual survey. This would ensure continued compliance with the OSM permit condition No. 3 requiring additional cultural resource studies should subsidence monitoring indicate the potential for significant impact. The GMCC proposal to resume quarterly monitoring for a one-year period following reactivation of mining is acceptable; however, they suggest monitoring should continue only if subsidence is indicated. I would suggest that quarterly monitoring continue to be required during the period of active mining as currently specified in the permit. If this plan is acceptable to you, it should be included in the revisions required section of the mid-term review report. /dlm 2187E 423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203 Tel. (303) 866-3567