Laserfiche WebLink
Rock Logic Consulting <br />MRonsulting ock LOg1C PO Box 544 • Cedaredge, CO 81413 <br />LLC Phone: (435) 851-9044 • rocklogicconsulting@gmail.com <br />Brad Lindsay • Consulting Geologist <br />Memorandum <br />Date: 22 July 2009 <br />To: Jim Abshire <br /> Joe Brinton <br /> Bill Bear <br />From: Brad Lindsay <br />Subject: Spring 2009 Subsidence Crack Mapping <br />Field Survey <br />A thorough field survey above the west end of the B7 longwall area was conducted. Several traverses <br />were hiked to observe subsidence cracks. The survey was completed in June 2009. No new cracks <br />were found. <br />Observations <br />The area over the west end of the B7 longwall was checked extensively. No new cracks were <br />observed. The small cracks identified during fall 08 crack mapping appear to be in similar condition. <br />The attached map outlines the area that was hiked. <br />Files <br />Crack measurements and field notes are recorded in an Excel file (Subsidence Crack Mapping Spring <br />09.xls). The AutoCAD map (Subsidence-Crack-Jun09-source.dwg) was updated with the area <br />surveyed.