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iii iiiiiiiiiiiii iii <br />C c~~us <br />"~ Empire Corporation <br />P.O. Box 68 <br />Craig, Colorado 81626 <br />303-8248246 <br />February 3, 1994 <br />Janet H. Binns <br />Environmental Protection Specialist <br />Division of Minerals and Geology <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />~~ECEIVED <br />~tB .~'S;4 <br />py <br />Re: Subsidence Monuments and Monitoring Associated With Entry Development <br />Beneath Highway 13: Permit C-81-044, Cyprus Empire Corporation <br />Dear Ms. Binns; <br />This letter is being sent as a follow-up to our meeting of 21 January, at which time <br />we discussed the establishment, baseline surrey, and timing efi mining progression <br />in relation to the above-referenced subsidence monuments. As conveyed to the <br />Division, conditions have changed at CEC in terms of marF;et, necessitating an <br />acceleration of the mining progression, which in turn has impacted the available <br />window for the installation and baseline survey of the Higtlway 13 subsidence <br />monuments. Based upon our discussion, CEC has installed the three subsidence <br />monuments and conducted the initial survey shots, with a second set of shots to <br />be completed prior to the undermining of the points during entry development. <br />Entry development is scheduled to begin in approximately ;i-10 days, with initial <br />undermining of the monuments occurring shortly thereafter. Our understanding <br />of the Division viewpoint on the timing (with initial start-up originally projected for <br />late this week) was that this would be acceptable, especially in light of the fact that <br />the baseline shots will be completed prior to the initial start-up of entry <br />development in that area. <br />We greatly appreciated your taking time out of your schedule to meet with us on <br />this and the other matters discussed 21 January. Should you have any questions <br />or comments, please contact either myself or Joe Shoemaker at your convenience. <br />Sincerely, <br />~i~~~l~t~~~~~~Zl! <br />Marcus A. Middleton <br />Environmental Engineer <br />