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Spring 2017 Subsidence and Geologic Field Observations <br />South of Divide and Dry Fork Mining Areas <br />3.0 SUBSIDENCE MONITORING <br />MCC has been collecting data from numerous monitoring locations in and around Minnesota <br />Reservoir, Monument Dam and the general Dry Fork area for many years. Ongoing monitoring <br />by MCC personnel includes the U.S. Forest Service (USFS) roads and stock ponds, as well as the <br />Monument Dam and Minnesota Reservoir area. Inspection forms and survey data for these areas <br />are provided in Appendices A, B, and C. Data and discussions associated with ongoing MCC <br />monitoring are provided by MCC and included in this WWE report for convenience. <br />3.1 USFS Roads and Stock Pond Monitoring <br />As described in previous subsidence reports, observations by MCC personnel of the USFS roads <br />and stock ponds in the vicinity of active mining activities have occurred for many years. Inspection <br />forms from observations conducted during the spring of 2017 are included with this report in <br />Appendix A. <br />3.2 Monument Dam/Minnesota Reservoir Monitoring <br />MCC has conducted monitoring of the Monument Dam and strategic locations around Minnesota <br />Reservoir since 2006. Data collected from various monitoring locations on the Monument Dam <br />(including Dam Inspection Forms) are provided in Appendix B. In addition, MCC has monitoring <br />and reporting responsibilities for the land survey stations. A summary of both average height and <br />longitudinal displacement data obtained from fall 2016 to spring 2017 is provided in Table 1 of <br />Appendix C. <br />831-032.799 Wright Water Engineers, Inc. Page 7 <br />August 2017 <br />