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Mined Land Reclamation <br />12 March 12, 1993 <br />Relative movement between surveys is shown in the following <br />Tables. <br />Table 3 Subsidence - Relative Movement <br />Period of July, 1992 to November, 1992 <br />Table 4 Slope Stability - Relative Movement <br />Period of July, 1992 to November, 1992 <br />TABLE3-SUBSIDENCE <br />SUBSIDENCE POINT CHANGES - RELATIVE MOVEMENT <br />JULY, 1992 TO NOVEMBER, 1992 <br />Point Horizontal Distance Bearing Elevation <br />No. <br />UT2 0.49 N88°14'E -0.47 <br />U4 0.30 N54o58"E -0.54 <br />U1 0.19 N46°34'E -0.31 <br />U3 0. X44 N65°35' E -0.10 <br />U2 0.26 N59o44'E -0.15 <br />U5 0.!i4 N65o47'E -0.09 <br />U9 0.10 N61°25'E -0.05 <br />UA1 0.12 N88o56'W -0.14 <br />U8 0.17 N72°26'E -0.02 <br />The change in horizontal position can be attributed to a variety <br />of factors (1) the error of closure and adjustment inherent in <br />any survey; (2) actual movement of the monuments due to sub- <br />sidence. The error of. closure for the November, 1992 traverse <br />was 0.56 feet of error in a total traverse distance of 18,207 <br />feet which reflects a c:losure ratio of 1 part in 32,500. <br />The elevations show a change that reflects an decrease in value <br />of 0.21 feet on the average. Elevations are obtained by <br />trigonometry. <br />The closures of our elevations using trigonometric leveling have <br />been very good. Errors ranging from 0.10 feet to no error. <br />