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TRAPPER MINING INC. CERTIFIED #P782939250 Mr. Kent Gorham Colorado Mined Land Reclamation Division 215 Centennial Bldg. 1313 Sherman St Denver, CO 80203 Dear Kent: it ....: ,L11na;[' L3;i~ This correspondence is in reference to our previous telephone wnversations concerning Trapper's intent to blast within 3110 feet of a powerline and within 600 feet of two permanent buildings in our Browning/Colt pit mining area. The line is owned and operated by the Yampa Valley Elecvic Association Inc. and is located along Trapper's western permit boundary adjoining G}rprus Empire Coal Company. Power is distnbuted to a variety of sources including nonessential Trapper and Cyprus Empire facilities, the Lux residence, the Siminoe residence and two other residences in the Big Bottom area. The two buildings are lopted within the Cyprus Empire permit boundary and are approxima[ety 600 feet from the proposed blast area. One building is used to temporarily house Empve security personnel during their current strike. The other building is used for equipment storage. Discussions with Cyprus Emptre concerning apre-blast survey have revealed that Empire will request Trapper to conduct such survey. A survey will be conducted and a report submitted to Empire prior to our blasting within the 1000' buffer. Empire also requests that Trapper notify them prior to any blasting closer than 1,000 feet from these structures to ensure security personnel are not in the buildings. Trapper will also ensure that all occupants have been evacuated by visiting the premises prior to each blast and notifying individuals of the imminent blast. The likelihood of impacting services to these residences and Cacilities is very slim. Trapper, in conjunction with Yampa Valley Electric Association and Cyprus Empire Corporation, plans to monitor and control impacts to the power transmission line and buildings by closely controlling the weight of the explosives to be detonated. The exact explosive de[onation amounts and subsequent peak particle velocities that will be generated are not known a[ this time. Economy and practicality of blast design dictates that initially Trapper use a "scaled distance [actor" of 10 or less as the 300 foot limit to the powerline is approached. This could produce "peak particle velocities" with an upper limit of 3 in/sec which should have virtually no effect on the powerline or buildings. Trapper will visually and seismically monitor blasts as we approach the transmission line and buildings to prevent possible damages. A record of each blast will be on file at the mine site for inspection by the Division and by the public on request Please fmd enclosed a written waiver by Yampa Valley Electric Association and Cyprus Empire Corporation, Inc. granting Trapper Mining Inc. permission to blast within 300 feet and 600 feet of their facilities, respectivety. Kent, if you have any questions or concerns, please contact me. fCM~D\DEC18l Enclosure J.M Matters ED. Schillic LD. Johns fife December 18, 1991 ~,_~r S/i~nce/re~~ ~ ~ /{'-GLG t~l~Z'/ ~'lP,~ illtam Agnew l Sr. Environmental En ineer P.0. Box 187 Craig, Colorado 81626 (303) 824.4401