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Fall 2018 Subsidence and Geologic Field Observations <br /> Southern Panels Mining Areas <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 2018 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 in <br /> Appendix C of the Fall Report using the July 2004 photograph as a baseline reference. For brevity, <br /> Maps C-2(September 2008),C-3 (June 2009),C-4(May 2010), C-5 (May 2011), C-6(June 2012), <br /> C-7 (May 2013), C-8, (June 2014) C-9 (June 2015), and C-10 (June 2016) are not included herein <br /> but can be found in the previous fall reports. Maps C-1, C-11 (May 2017), and C-12 (May 2018) <br /> are provided in this report as Appendix C for comparative purposes. <br /> A comparison of the most recent image to that from 2004 finds no changes attributable to mining <br /> activities. The only notable difference over time is in the area south of the south Monument Dam <br /> abutment where a fall 2009 French drain installation occurred, as discussed in numerous previous <br /> reports. A comparison of the two most recent images finds no discernable differences. <br /> At the time of the May 2018 aerial photograph, E-seam longwall mining was complete on Panels <br /> El, E2, E3, E4, E5, and E6 and about seventy percent (70%) complete on Panel E7 with mining <br /> 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 2018 Water Resources Project Survey Report <br /> generated for this purpose. <br /> 831-032.900 Wright Water Engineers, Inc. Page 8 <br /> April 2019 <br />