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tSTGTE OF COLOR40O <br />NI~t~~Nl~ O. L, ~•V"^~••~ <br />DEPARTMENT OF NATURAL RESOURCES <br />D. Monte Pascoe, Executive Dhectnr <br />~1INED LAND RF.~:LAMA'I'ION <br />423 Centennial Building, 7373 Sherman street <br />Denver, Colorado 80203 Tel. (303) 866-3567 <br />iiiiiiiiiiiniiiiii <br />999 <br />David C. Shelton <br />Director <br />DATE: October 19, 1982 <br />TO: Dan Mathews ., <br />FROM: Jim Pendl e ton `'"~ ~µ_ t ~~ <br />RE: Subsidence Mon; Coring an, Bear No. 3 Pfi ne <br />Z have reviewed the document entitled "Subsidence Monitoring Plan, <br />No. 3 Mine", which you forwarded to me. The document, prepared by <br />Bear Coal Company, was submitted in compliance with Stipulation No <br />of the Bear mine permanent program permit, No. C-033-8I. <br />Bear <br />IS <br />As the findings documentfor the Bear No. 3 mine permit explains, the <br />Division imposed Stipulation No. IS upon permit approval because it <br />was concerned that the stability of ancient and modern landslide deposits <br />could be affected by differential surface subsidence, if it were to <br />occur, above the Bear No. 3 underground workings, (See page 87 of the <br />attached findings document) <br />Bear Coal Company proposes the installation of three additional subsidence <br />monuments above the first area which will be retreat mined within the No. 3 <br />mine. These rronuments should provide valid information concerning the <br />magnitude of subsidence, if it occurs, within those areas. In addition, <br />however, the Division considers it prudent to install several subsidence <br />monuments within the landslide deposits of specific concern above the <br />underground workings. The attached xerox excerpt from Bear Coal Company's <br />amended rap E-3, indicates two additional monument locations which the <br />Division believes it would be appropriate to monitor. (See monument <br />No. 10 and No. 11 on attached xeroxed excerpt of map E-3) With~~the <br />addition of these monuments, as well as any bench narks or additional <br />monuments required to complete survey of the additional monuments, <br />the Division would consider the subsidence ionitoring plan to be.acceptable. <br />