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,~ . <br />III Illllllllllll 111 ~ :, <br />STATE OF COLORADO <br />DIVISION Of MINERALS AND GEOLOGY <br />Depanmeni of Nalu ral Resources <br />1317 Sherman Sl., Room 215 <br />Denver, Colorado 80207 <br />Phone (7031 Bbh-3567 <br />FA%~. 5303) 832-8106 <br />November 1, 1996 <br />Mr. Larry Reschke <br />Powderhorn Coal Company <br />P.O. Box 1430 <br />Palisade, Colorado 81526 <br />RE: Roadside Mine (C-81-041) <br />PR-02 Subsidence Review <br />Dear Mr. Reschke: <br />~~ <br />~~~~ <br />DEPARTMENT OF <br />NATURAL <br />RESOURCES <br />Roy Romer <br />eo`ernnr <br />tames 5. Lndrhead <br />6ecWive Director <br />ntichael B Long <br />Dwision D~renn. <br />The Division has reviewed the amended Subsidence section (Tab 20) <br />of the PR-02 revision application. The one remaining concern we <br />have is with respect to the PSCO powerline subsidence mitigation <br />plan. The Division has never accepted an agreement freeing the <br />operator of responsibility for damage as adequate to satisfy this <br />requirement. Rather, mine companies have been required to <br />demonstrate that their activities will not result in impacts off <br />the permit area. With respect to possible subsidence effects to a <br />powerline, it is the responsibility of the operator to demonstrate <br />that if the worst case impact, failure, were to occur, electrical <br />service would not be interrupted. In an analagous situation at the <br />Foidel Creek Mine, this requirement was satisfied by a statement <br />from the utility that its grid was sufficient to compensate for a <br />temporary interruption in the integrity of the powerline. <br />Powderhorn will need to obtain a similar statement from PSCO to <br />document that the power grid is capable of sustaining interruption <br />due to subsidence without impact to electric service off the permit <br />area. <br />Please contact me if you have any questions. <br />sincere ~ "~~~~` <br />Dan T. athe s <br />Environmenta Protection Specialist <br />cc: Larry Routten <br />Jim Pendleton <br />