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• .i Al l G' Cf•I iii: .~rii' .. .~,,, ii .... ... UFP,IRT MFNT Of r,~ATURAL RESUVROES n rn~,.~,. r.r.o~ , r.~ .~,~,. ~ n.. ~..., a23 Centennial Ewid~nq, t3t3 Sherman Street Denver, Colorado 60203 Tet (303) David C. Shelton l:ovember 9, 19B2 DireCtOr f .. i TO: Dob Liddle FRO14: Jim Pendleton ~ '•_ ..:-.~^t 1Lf.~~-... 24: Colorado 6iest=relprrClrs First subsidence Fonitoring Report I have reviewed Colorado Westmoreland, Inc.'s October, 1982 subsidence monitoring report for the Orchard Valley t9ine. t,%th the remelt{ of several deficiencies listed here below, the report will be acceptable. (1) As indicated bu the applicant in earlier communications, difficulties t,'ere encountered during the first survey of the subsidence monurnnts, as is obvious from the large deviations recorded in the earlier subsidence survey observations. It is possible that non-subsidence related surace mover..ants could have occurred. No:~ever, the magnitudes indicated by the earlier readings should have been accompanied by obvious artifacts of movement, such as cracking or scarp formation. IJext wear's surveying results should resolve this problem. The report indicates that mining will not occur t.•ithin the tarcet panel until October, 1983, e.'hich should allow complete resolution. (Z} The report references surface cracking which has been observed between panels first and second west. The locations of this crackino should be indicated on the mine man. If any photographs were :Wade of these cracks, copies should be included 1.•ithin the report. If a photographic record has not been made to date, the company should begin photographing such subsidence- related features hencefort~ncluding careful documentatson of scale. The subsidence monitoring report was covered by a letter requesting modifications to stipulation too. 5 of Permit No. C-036-81, stipulation t:o. 5 recites the subsidence reporting requirements of Orchard Valley's permanent prograr permit. The company indicates that the annual hydrolocu report will include detailed hydrologic observations anri requests permission to address hudroleery in a general vain within the subsidence report. i,'hile this was not s(.cci~ied within the Findings Lbcu,-jan[, t.iis w.is the Division' intent. :i,e co~n~ny also requests that the sub,^tission dates for the re'u:mr subsidence reports be am.•nded fror the original !;ay 1 and A'ovcr.>her to ..u-:at a.-:d I'eb rua ry 1 of ea c1; year. I );a ve nc. probl ec with this cha xe ;n :: br_ssi on dates. • I suynest, ho~:cver, t,a~ it may be ~onve.ti ent fur the cpplicant to amend the =primp hate to corrc~r:cn' f,'ith the required annual h~~riroloc,l retort submission arc n.` Jarw.~nl 1. If this is not desirable [o the co.^panu, I .__'1 approve the requested rebl'Jdru 1 end Auc;ust 1 subciss;en d.ltes. :he or,lc co::rition