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Fall 2017 Subsidence and Geologic Field Observations <br />South of Divide and Dry Fork Mining Areas <br />During the fall 2017 field visit, accessible areas within the SOD and Dry Fork mining areas 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 have 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 will be used as appropriate <br />without reference to a numbered location. When observations from these locations are of <br />significance, they will be aptly noted with a view direction on Map 1, but without a repeating <br />designation. <br />831-032.799 Wright Water Engineers, Inc. Page 4 <br />February 2018 <br />