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L~ <br />DEPARTMENT OF NATURAL RESOURCES <br />O Np~~e Pasc a' E.rc vow. J~fap o~ <br />MINED LAND RECLAMATION DIVISION <br />DAVID C. SNE~TO N, Diratlor <br />R ¢na..f D Lamm <br />G rrf in„~ <br />T0: Bob Liddle ~ <br />i" <br />FROM: Jim Pendleton - <br />RE: Colorado W~tfiorel <br />Dated August 1 983 <br />Pursuant to your request, I <br />monitoring report submitted <br />with my letter of several we <br />maps, cross-section, surface <br />data ,I and raw hydrology mine <br />submitted a brief record of <br />as well as a "Roof Lithology <br />August 26, 1983 <br /> <br />Ins.'s Subsidence Monitoring Report, <br />h~ <br />~s ,~ <br />'~~ <br />have reviewed the August 10, 1983 subsidence <br />by CWI for the Orchard Valley Mine. In keeping <br />eks ago, the operator has submitted appropriate <br />artifact observations, raw and reduced survey <br />inflow data. In addition, the operator has <br />a mine inflow encountered within the 2; west area, <br />Map". <br />The operator briefly speculates that the 3.5 gal]on per minute inflow, which <br />ceased August 5, 1483, was due to dewatering of a perched roof channel deposit <br />• aquifer. This scenario is logical and the flow has tapered. The analysis <br />due in conjunction with the operator's Jan. 1, 1984 complete subsidence and <br />hydrology reports should resolve any concern regarding this topic. <br />Mining has not yet begun beneath the high resolution subsidence monitoring <br />grid network installed above the fifth north panel off the eighth east sub- <br />mains within the Orchard Valley Mine. Minor movements have been recorded <br />at several of the older, wider-spaced quarter section subsidence survey <br />monuments, with two suffering landslide occurrences during the past wet <br />spring season. <br />/mt <br />cc: Ed Bischoff <br /> <br /> <br />423 Cenir•nnlal pulitlinq. 1373 Sherman Street Denser, Colorado 80203 Tcl (303 666-3567 <br />