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.~ ~ iiiiiiiiiiiiiiuiii <br />999 <br />~ Twenfymile Coal Company <br />March 16, 1995 <br />Kent Gorham <br />Environmental Protection Specialist <br />Division of Minerals and Geology <br />Office of Mined Land Reclamation <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80202 <br />RE: TR 94-18 <br />Permit No. C-82-056 <br />Dear Mr. Gorham: <br />29515 Routt County Road p27 <br />Oak Creek, CO 60467 <br />Phone (303) 879-3800 <br />~,; <br />~- R~c~~n~~n <br />~ 20 19es <br />Oty~slon of M~~era,s u <br />~`` ~dY <br />~~ <br />The following present Twentymile's responses to the issues detailed <br />in the Division's letter of March 9, 1995. The format provides the <br />DMG issue followed by Twentymile's response. <br />DMG letter of March 9, 1995 <br />DMG Concern A. Page 2.05-11(f) indicates that ditch E-2 hydraulic <br />calculations include additional volumes for mine water discharge. <br />However, Table A shows no additional volumes included for mine <br />water discharge. Please explain this apparent discrepancy. <br />Response - Table A has been modified to show mine water discharge <br />being routed through this ditch. <br />DMG Concern B - The text states that two culverts identified as D- <br />3-b will be replaced by one 51 inch culvert. Please correct the <br />culvert Table B to reflect the correct information. <br />Response - Table B has been corrected to note that either the two <br />36 inch culverts or the 51 inch can be utilized as culvert D-3-B. <br />This will allow Twentymile the flexibility to install the most cost <br />effective culvert at this location. <br />CHRISTINE JOHNSTON MEMO OF MARCH 9, 1995 TO KENT GORHAM <br />1. There were a number of structures that had been described in the <br />text pages but not included in the estimate. The structures noted <br />have been included in the estimate for this TR or in Minor Revision <br />No. 111 and are acceptable. Please reference Task 92A to be <br />incorporated into the estimate. You will note the volume of the <br />magnetite storage bin has been changed in task 92A because it was <br />incorrect in the operator's estimate. <br />I also requested the total capacity for coal stockpiles, as the <br />Division includes a disposal cost for 50 percent of the coal <br />