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Fall 2019 Subsidence and Geologic Field Observations <br /> Southern Panels Mining Area <br /> Observations associated with E-seam longwall mining of Panels E1 through E5 (mined and <br /> subsided more than two years previous) can be found in reports prior to 2016. Observations of the <br /> Apache Rocks and Box Canyon B-seam mining areas are covered in reports prior to 2013. <br /> During the fall 2019 field visit, accessible areas within the Southern Panels Mining Area were <br /> visited,examined, and photographed to document subsidence-related features observed up through <br /> the last field visit and to record newly observed features for future reference (see Maps 1 and 2). <br /> Field observations were made from a 4-wheel drive vehicle and by foot as needed. <br /> Thirteen photographic observation points had been established and used since 2007 to view and <br /> assess changes that may occur as a result of mining. Many of these locations had been used for <br /> annual comparative purposes even before formal identification with a numeric designation. <br /> Beginning with the spring 2013 field visit, nine of these points were removed from the list of <br /> observed sites based primarily on their specificity to the terminated B-seam mining activities. <br /> Beginning in 2016, these historic photographic observation points have been used as appropriate <br /> without reference to a numbered location. When observations from these, or newly established, <br /> locations are of significance, they will be noted with a view direction on Map 1, but without a <br /> repeating designation. <br /> 831-032.910 Wright Water Engineers, Inc. Page 4 <br /> February 2020 <br />