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,^ III IIIIIIIIIIIIIIII 999 . xeow Senbom Creek Mine January 31, 1997 William J. Carter I~Cr(=~~''-~ Environmental Protection Specialist state of Colorado ftg p 3199f Division of Minerals and Geology 1313 Sherman Street, Room 215 Denver CO 80203 RE: Safety Culvert Permit No. C-81-022 Dear Mr. Carter: As we discussed by telephone today, our safety director has requested a culvert be placed in collection ditch CD-2 next to conveyor drive number 4 along the road to the Sanborn Creek Mine portal, and removal of the siding on the conveyor drive number 4 building. This narrow section of road, indicated on the attached portion of Drawing Number 5-002, has been the site of a head-on collision between mine vehicles. From pages B-93 and B-94, Appendix B, Volume 7 of the Permit Application, the design flow for collection ditch CD-2 is 17.81 cfs. A 30-inch cmp culvert has a flow capacity of 19 cfs at zero head. We plan to install the culvert and cover it with road base to provide a wider road at the indicated location. We also plan to remove the siding from three sides of the drive building to improve the site distance around this corner. Also, since we have installed the berm along the secondary access to the mine site along the abandoned portion of Old State Highway 133, as discussed with you previously, we plan on removing some of the large rocks along the road to increase the width. The large rocks were placed there during relocation of the railroad prior to the opening of the Sanborn Creek Mine. A local contractor has approached the mine for use of the rock as rip-rap material for projects off-site and unrelated to the mine activity. Please call if you have questions, or require additional information. Thomas C. Anderson, P.E. Environmental Coordinator cc: Terry Hayes, Safety Director P O B o a 5 3 5 S o rn e r s e t C o l o r a d o 6 7 4 J 4 U S A TEL ( 9 7 0) 9 2 9 5 1 2 2 F A K ( 9 7 0) 9 2 9 5 1 7 7