REP37735 - Laserfiche WebLink

Home Browse Search

~ ~ III1111111111A1111 DEPARTMENT OF NATURAL RESOURCES David H. GsMhe4 Exetutlve Director MINED LAND RECLAMATION DIVISION DAVID t* SHELTON, DlnMOr Richard D. Lamm Governor MEMORANDUM 1.~.-"~' ' 19 J e 1986 - - T0: Dan Mathews FROM: Jim Pend]eton i RE: Foidel Creek M - R ponse to Geotechnical Adequacy Review Comments Permit No: C-85-056) I have completed a review of the March 28 and May 22, 1986 adequacy review responses made by Twentymile Coal Company (Cyprus Western). I specifically reviewed the responses to the geotechnical comments contained in IRy December 31, 1985 memorandum to you. The applicant's supplemental submittals have resolved my concerns regarding "B ackfilling and Grading" (Rules 2.05.4(2)(c) 8 4.14), and "Sealing Portals" (Rules 2.05.4(2)(8) 8 4.07). However, several of nlY concerns regarding "Subsidence Control" (Rules 2.05,6(6) and 4.20) will require additional amendment, as outlined here after. Subsidence Control: Rules 2.05.6(6) 8 4.20 (1) The Division requested the applicant provide detailed information to discern whether structures inventoried by the company would require addtional constraints to protect the health and safety of the public. In response to earlier comment, the applicant has indicated only that "Access to the structures listed in the inventory is controlled by TCC. No additional constraints for the described structures are proposed at this time to protect the health and safety of the public. This response is inadequate to satisfy my earlier concern. The operator will have to describe the methods of "controlling access" to the structures. The Division is responsible for assuring the protection of the public, including hunters, ranchers, tourists, etc. The operator must provide sufficient detail to allow the Division to find that the health and safety of the public is assured. I recommend that signage be installed at appropriate locations on the controled structures to inform people of the potential hazards. (2) In our earlier adequacy comments we expressed concern for the maintenance of the irrigation facilities within the potentially subsided area. The applicant has responded; "Prior to mining under the areas where the (irrigation) structures are located, a survey will be conducted to determine which structures are active. Appropriate monitoring will be conducted at that time. Shduld damage occur to these structures, TCC will repair the systems to their premining conditions." 423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203 Tel. (303) 866-3567