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iii iiiiiiiiiiiuiii 999 To: jap~min Cc: dab Bcc: From: MathewsD~COALODNRML Subject: Deserado TR-48 Subsidence Date: Wednesday, July 1, 1998 15:41:11 MDT Attach: Certify: N Priority: Normal Defer until: Expires: Forwarded by: I think I left a phone message regarding some questions I had on your June 18 memo to me regarding Deserado's TR-48 B seam mine plan and revised subsidence prediction and control plan. But maybe not. Based on certain items in your memo, I fear you may have reviewed the wrong B seam mine plan map. The updated B seam mine plan is Map 120, "Proposed B Mine Plan", with a certification date of 4/27/98. The workings shown on Map 135, which your memo references, are relicts of a now defunct plan, In our initial adequacy review letter, I had pointed out the discrepancy between Map 120 and Map 135. Operator responded that '...Map 135 is not B-Seam mine plan. Its main purpose is to show the surface facilities over the B-Seam mine area." Obviously, this has caused some confusion, and I will request the operator to properly amend Map 135. Given this, I think several of the concerns and recommendations in your memo may not apply. On page 2, under III.A.7.c.. you mention that panels LW-1B through LW-BB are "projected to be extracted through the year 2023." However, Map 120 shows those panels to be mined through the year 2015. I think your concerns regarding superimposed B and D seam workings, as discussed on p. 2 and p. 3 of the memo may be moot, given that there are apparently no superimposed workings based on overlay of Map 120 (B seam Mine Plan) and Map 119 (D Seam Mine Plan). I apologize for the confusion caused by the map discrepancies, but I need to request that you review Map 120, and revisit your review memo, amending it as appropriate based on the Map 120 B Seam Mine Plan. If you do not have a copy of Map 120, check the public file for TR-48. If the map is not on file, let me know and I will send a copy over. Thanks