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~- - a <br />fo. III IIIIIIIIIIIII III <br />STATE OF t.lJL9~l1~1J0 <br />MINED LAND RECLAMATION DIVISION <br />Department of Natural Resources <br />7313 Sherman St., Room 275 <br />Denver, CO 80203 <br />303 866-3567 <br />FA x: 303 832-8106 <br />of ~~~ <br />N~~/R'o <br />0 <br />~ y8~6 ~ <br />May 26, 1992 <br />Mr. Marcus Middleton <br />29587 Routt County Road No. 27 <br />Oak Creek, CO 80467 <br />Ray Romer, <br />Governor <br />Michael B. Long, <br />Division Director <br />Re: 3rd and 4th Quarter 1991 Subsidence Monitoring Report, File No. C-SZ-056 <br />Dear Mr. Middleton: <br />The Division has completed its review of the above mentioned report. Please <br />respond to the following questions prior to submitting the next subsidence <br />report. <br />Exhibit 34, Volume IIIA outlines information to be contained in each <br />subsidence monitoring report. Specifically, a plan view map of surface <br />topography and Structures as they relate to underground workings (see also <br />adequacy question 4), pre-mining and present visual inspection data, and <br />conclusions are not included in this report. Please submit all <br />information required by Exhibit 34 of your current permit for this and <br />future subsidence reports. <br />2. A-2 is improperly referenced on the A-series profile as A-1. Please <br />correct, if necessary, for future reporting. <br />3. The subsidence profile, B-series, has seven additional points between B-13 <br />(725 ft.) and B-12 (1,450 ft.). What is the origin of these data points? <br />4. As per Rule 2.10.3(1)(k) please submit (with future subsidence reports) a <br />map showing the subsided underground mining area superimposed on a <br />1:6000 scale map of the existing surface topography (i.e. including <br />post-mining topography after any surface mining). The underground areas <br />indicated need not be detailed. Potentially, subsided paneis and areas to <br />be mined in the following six month period need to be delineated. This <br />will assist the Division in monitoring surface features such as the <br />Twentymile Sandstone Cliffs and Fish Creek as they may be affected by <br />future mining activities. <br />Thank you for your continued cooperation <br />Si ncere.Ty <br />,•~/ <br />./~C~~ <br />`' uCen~ A. Gorham <br />Reclamation Specialist <br />Please call if you have questions. <br />KAG/ern <br />3265E <br />