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~'~ a~ ~.-.r-, . <br />III IIIIIIIIIIIII III <br />DEPARTMENT OF NATURAL RESOURCES 99g <br />D Monie Pascoe. E.eculive Dneci or <br />MINED LAND RECLAMATION DIVISION ~ <br />DAVID C. SHELTON, Direetor <br />Ric hartl D Lamm <br />Governor <br />M E M O R A N D U M <br />1 ust 1983 <br />T0: Bob Liddle , <br />FROM: Jim Pendleton <br />RE: Clarification of ado Westmoreland's Subsidence Report Format <br />Jim Roberts, Geoloyist with Colorado Westmoreland's Orchard Valley <br />Nine staff, telephoned Ine on Tuesday, August 9th, requesting a <br />clarification of their subsidence report format. In response, I have <br />reviewed the permit files to determine the specifics of their format <br />requirements. <br />Last summer they requested an amendment of the report due dates. <br />Originally they were required to submit semi-annual subsidence reports on <br />May 1 and November 1 of each year. They have been given a variance in <br />survey frequency, because of extreme snowfall conditions. They were <br />directed to complete surveys at least three tunes between June 1 and <br />November 1 each year. In reflection of that seasonal ti~niny, their <br />report submission dates were amended to Auyust 1 and January 1 of each <br />year. The January 1 date was selected by CWI specifically to correspond <br />with the required submission of their annual hydrology report. <br />Jim Roberts also inquired as to whether we were expecting both <br />semi-annual reports to be identical in format. Because the August 1 <br />report may be proceeded by only one or two survey observations, I do not <br />believe it realistic to expect an entire reduction and comparison with <br />their application's projected subsidence parameters. Therefore, I <br />recommend that we require that the August 1 semi-annual subsidence report <br />contain the survey data, reduced to reflect horizontal and vertical <br />movement of monuments, the appropriately updated cross-sections and maps, <br />and a brief description of any pertinent hydrology and ground surface <br />condition observations. The January 1 semi-annual subsidence report <br />should also contain a detailed description compariny the year's <br />observations with the subsidence hydroloyy and mechanical responses <br />projected within the approved application documents. <br />cc: Ed Bischoff <br />423 Centennial Building, 1313 Sherman Street Denver. Colorado 60203 Tel. (;103) 866-3567 <br />