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Spring 2012 Subsidence and Geologic Field Observations <br />Box Canyon, Apache Rocks, and South of Divide Mining Areas <br />The Minnesota Reservoir Robotic Total Station (RTS) surveyed twelve monuments on the dam <br />(6000 series) and twenty -six monuments on the hillside south of Minnesota Creek Road (7000 <br />series), once a day from late 2008 to the summer of 2011, although there were several periods of <br />time when the RTS was inoperable. During the summer of 2011 the RTS failed completely and <br />could not be repaired after numerous attempts. In lieu of the RTS, monthly land surveys of the <br />monuments were completed. A summary of both average height and longitudinal displacement <br />data obtained in fall 2011 in comparison to spring 2012 is provided in Table 1 of Appendix C. <br />831 - 032.794 <br />November 2012 <br />Wright Water Engineers, Inc. Page 5 <br />