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<br />~II ~I~II~~I~~~~~ ~II <br />TRAPPER NINING INC. <br />CERTIFIED #P782939280 <br />Mr. Kent Gorham <br />Colorado Mined Land Reclamation Division <br />215 Centennial Bldg. <br />1313 Sherman St <br />Denver, CO 80203 <br />Dear Kene <br />q~.; <br />Mtnec! Land <br />°"~em3tl0f1 rr"' <br />~_ <br />This correspondence is N reference to our previous telephone conversations concerning Trapper's intent to <br />blast within 300 feet of a powerline and within 600 feet of two permanent buildings in our Browning/Colt pit <br />mining area. The line is owned and operated by the Yampa Valley Electric Association Inc. and is located <br />along Trapper's western permit boundary adjoining Cyprus Empire Coal Company. Power is distn'buted to <br />a variety of sources including nonessential Trapper and Cyprus Empire facilities, the Lux residence, the <br />Siminoe residence and two other residences in the Big Bottom area. The two buildings are located within <br />the Cyprus Empire permit boundary and are apprordmately 600 feet from the proposed blast area. One <br />building is used to temporarity house Empire security personnel during their current strike. The other <br />building is used for equipment storage. Discussions with Cyprus Empire concerning apre-blast survey have <br />revealed that Empire will request Trapper to conduct such survey. A survey will be conducted and a report <br />submitted to Empire prior to our blasting within the 1(100' buffer. Empire also requests that Trapper notify <br />them prior to any blasting closer than 1,000 feet from these structures to ensure security personnel are not in <br />the buildings. Trapper will also ensure that all occupants have been evacuated by visiting the premises prior <br />to each blast and notifying individuals of the imminent blast The likelihood of impacting services to these <br />residences and facilities is very slim. <br />Trapper, in conjunction with Yampa Valley Electric Association and Cyprus Empire Corporation, plans to <br />monitor and control impacts to the power transmission line and buildings by closely controlling the weight of <br />the explosives to be detonated. The exact explosive detonation amounts and subsequent peak particle <br />velocities that will be generated are not known at this time. Economy and practicality of blast design dictates <br />that initially Trapper use a "scaled distance factor" of 10 or less as the 300 foot limit [o the powerline is <br />approached. This could produce "peak particle velocities" with an upper limit of 3 in/sec which should have <br />virtually no effect on the powerline or buildings. Trapper will visually and seismically monitor blase as we <br />approach the transmission line and buildings to prevent possible damages. A record of each blast will be on <br />file at the mine site for inspection by the Division and by the public on request <br />Please fmd enclosed a written waiver by Yampa Valley Electric Association and Cyprus Emp've <br />Corporation, Inc. granting Trapper Mining Inc. permission to blast within 300 feet and 600 feet of their <br />facilities, respectively. Kent, if you have any questions or concerns, please contact me. <br />fCMLRD\DEC18J <br />Enclosure <br />J.M. Ma uern <br />ED. Schillie <br />LD. ]ohns <br />fie <br />P.0. Box 167 <br />December 18, 1991[ <br />4~'e..°~~ ~.. <br />Sincere <br />illiam Agnew <br />Sr. Environmental En ineer <br />Craig, Colorado 81626 <br />(303) 824-4401 <br />