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Dudash, Joe <br />From: Jim Stover gestover@bresnan.net] <br />Sent: Thursday, January 28, 2010 9:33 AM <br />To: Dudash, Joe <br />Cc: Jim Abshire; Art Etter <br />Subject: RE: Bowie No. 2 Midterm Question <br />Joe: <br />Yes, I think you got it. The issue is that the area was already predisposed to failure do to historic subsidence from burnt <br />B-Seam and D-Seam coal. <br />Jim Stover <br />J. E. Stover & Associates, Inc. <br />2352 N 7th St Unit B <br />Grand Junction, CO 81501 <br />Phone 970-245-4101 <br />Fax 970-242-7908 <br />From: Dudash, Joe [mailto:Joe.Dudash@state.co.us] <br />Sent: Wednesday, January 27, 2010 1:03 PM <br />To: jestover@bresnan.net <br />Subject: Bowie No. 2 Midterm Question <br />In the 2009 Midterm review for Bowie No. 2, the Division commented that it thought that outcrop failure had occurred <br />in the Freeman Gulch landslide of June 2007. The Division requested that BRL reevaluate the issue of outcrop barrier <br />pillars and whether more protection was needed. <br />In a letter dated October 26, 2009, BRL responded that it did not agree that outcrop barrier failure caused the landslide. <br />If I understood it correctly, BRL stated that the initial roof fall on the east side of panel B-6 affected an area that was <br />already predisposed to failure due to historic subsidence from burnt B-seam and D-seam coal. <br />Is BRL stating, then, that the outcrop barrier pillars could not hold up the overburden because the underburden gave <br />way beneath the outcrop barrier pillars and that no reasonable amount of increased barrier pillar width would have <br />prevented the landslide? <br />No virus found in this incoming message. <br />Checked by AVG - www.ava.com <br />Version: 9.0.733 / Virus Database: 271.1.1/2640 - Release Date: 01/27/10 06:08:00