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~ iii iiiiiiiiiiiu iii <br />999 <br />DEPARTMENT OF NATURAL RESOURCES <br />Davltl H. Getches, Executive Director <br />• <br />MINED LAND RECLAMATION DIVISION <br />DAVIDC. SHELTON, Director <br />Richertl D. Lamm <br />Governor <br />M E M O R A N D U M <br />4 March 1984 <br />T0: <br />FROM <br />RE: <br />Jim Herron \ <br />Jim Pendleton <br />Powderhorn Coa mpa y's Subsidence Monitoring Report, <br />Sub ed February, 1984 <br />The report presents the survey data from a portion of the subsidence <br />monitoring monument network installed above the workings of the Roadside <br />Mine. Several monument cross-section lines were not surveyed, due to heavy <br />snow accumulations. The Company anticipates submittal of these additional <br />survey results during April of this year. Please forward the additional data <br />for my perusal upon its arrival. <br />The survey results submitted are acceptable. However, in the future please <br />instruct Powderhorn to superimpose subsequent survey profile lines upon the <br />previous survey profile lines. This will facilitate detection of progressive <br />ssubsidence adjustments. Admittedly, this will complicate the plots due to <br />multiple profile lines inclusion on a single cross-section. Careful choice of <br />point symbols should allow differentiation of the various generations of <br />survey results. <br />cc: Brian Munson <br />423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203 Tel. (30~) 868-3567 <br />