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Y <br />STATE OF COLORADO <br />III IIIIIIIIIIIII III <br />DIVISION OF MINERALS AND GEOLOGY <br />Depanmenl of Natural Resources <br />1313 Sherman St., Room 21 5 <br />Denver, Colorado 80203 <br />Phone: 13031 866-3 56 7 <br />FA%. (3031 832-81 06 <br />October 28, 1994 <br />Mr. Lawrence G. White, P.E. <br />921 Hamson Avenue <br />Canon City, CO 81212 <br />Re: Adequacy Review -Technical Revision No. 7, Final Reclamation Plan <br />Twin Pines Mine, Permit No. C-83-058 <br />Dear Mr. White: <br />II~~~ <br />DEPARTMENT OF <br />NATURAL <br />RESOURCES <br />Roy Romer <br />Governor <br />lames S L«hhead <br />Execwive Director <br />Michael B Long <br />D~v~s~on Director <br />Included with this letter are our questions and recommendations pertaining to the Technical <br />Revision No. 7 (TR-07) application. Please accept our apologies for the delay in responding to <br />your submittals of September 2, 1994. Please understand that many of these questions are <br />intended to clarify the record. <br />Twin Pines No. 2 Mine Site <br />Stnrctural Removal <br />1. Please verify that all structures, foundations, equipment, and gash will be removed from <br />the mine site and properly disposed. Please also verify that none of these items will be <br />buried on site, with the exception of rubblized concrete which will be disposed within the <br />portals prior to back}`dling. <br />2. Are there PCB's present in any transformers at the mine site? If so, in what <br />concentrations, and how will the transformers be decommissioned? <br />Portal Closure <br />Please verify that the portals will be closed using the designs depicted on Drawing TPS-4, <br />which include the use of bulkheads. <br />Backfilling and Grading <br />The currently approved reclamation plan for the Twin Pines No. 2 mine site does not provide for <br />complete elimination of the highwall located at the site. As has been discussed at great length, <br />this is allowable under specific conditions. Discussion and questions are presented as follows to <br />ensure that the approved plan is in compliance with all applicable performance standards. <br />