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Fall 2019 Subsidence and Geologic Field Observations <br /> Southern Panels Mining Area <br /> 3.2 USFS Roads and Stock Pond Monitoring <br /> Observations by MCC personnel of the USFS roads and stock ponds in the vicinity of active <br /> mining activities have occurred for many years. Inspection forms from observations conducted <br /> during the fall of 2019 are included with this report in Appendix B. <br /> 3.3 Monument Dam/Minnesota Reservoir Aerial Photograph Comparison <br /> Each year, MCC performs an aerial photographic survey of the landslides located north and south <br /> of Minnesota Reservoir. Annual comparisons have been performed each year since 2004, which <br /> are included in Appendix C of the Fall Report using the July 2004 photograph as a baseline <br /> reference. For brevity, Maps C-2 (September 2008), C-3 (June 2009), C-4 (May 2010), C-5 (May <br /> 2011), C-6 (June 2012), C-7 (May 2013), C-8, (June 2014) C-9 (June 2015), C-10 (June 2016), <br /> and C-11 (May 2017) are not included herein but can be found in the previous fall reports. Maps <br /> C-1 (July 2004), C-12 (May 2018), and C-13 (November 2019) are provided in this report in <br /> Appendix C for comparative purposes. <br /> A comparison of the most recent image to the image from 2004 finds no changes attributable to <br /> mining activities. The only notable difference over time is in the area south of the south Monument <br /> Dam abutment where a fall 2009 French drain installation occurred, as discussed in numerous <br /> previous reports. A comparison of the two most recent images finds no discernable differences. <br /> At the time of the November 2019 aerial photograph, E-seam longwall mining was complete on <br /> Panels E1, E2,E3,E4,E5,E6, and E7 and was about eighty-five percent(85%) complete on Panel <br /> E8 with mining progressing from southeast to northwest. <br /> 3.4 U.S. Forest Service Water Resources Survey <br /> MCC is required, as part of its permit, to monitor USFS water resources (i.e., reservoirs and <br /> stock ponds). Appendix D of this report is the 2019 Water Resources Project Survey Report <br /> generated for this purpose. <br /> 831-032.910 Wright Water Engineers, Inc. Page 8 <br /> February 2020 <br />