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<br /> <br /> <br />Mined Land Reclamation <br />STATION U23 <br />'c7 <br />July 10, 19'?0 <br />July, 1967 404,212.45 1,441,756.40 6143.78 <br />October, 1987 404,212.44 1,441,756.41 6143.81 <br />June, 1988 404,212.50 1,441,756.44 6143.78 <br />November, 1988 404,212.51 1,441,756.44 6143.79 <br />July, 1989 404,212.57 1,441,756.45 6143.75 <br />November, 1989 404,212.64 1,441,756.43 6143.75 <br />July, 1990 404,212.67 1,441,756.43 6143.74 <br />Mean 404,212.54 1,441,756.43 6143.77 <br />Relative movement between surveys is shown in the following <br />Tables. <br />Table 3 Subsidence - Relative Movement <br />Period of November, 1989 to July, 1990 <br />Table 4 Slope Stability - Relative Movement <br />Period of November, 1989 to July, 1990 <br />• <br />TABLE 3 - SUBSIDENCE <br />SUBSIDENCE POINT CHANGES - RELATIVE MOVEMENT <br />NvVEMBER, 1989 TO JULY, 1990 <br />Point Horizontal Distance Bearing Elevation <br />No. <br />UT2 0.25 N40°O6'E +0.03 <br />U4 0.25 N73°44'B +0.06 <br />U1 0.23 N72°21'E -0.08 <br />U3 0.23 574°45'E -0.04 <br />U2 0.22 EAST -0.10 <br />U5 0.26 885°36'E -0.01 <br />U9 0.20 N75°15'E -0.13 <br />UA1 0.36 N78°41'E -0.17 <br />U8 0.25 N78°14'E +0.04 <br /> <br />The error in horizontal position is due to the error inherent to <br />any survey. The error of closure for this traverse was 0.18 feet <br />of error in a total traverse distance of 18,207 feet which <br />reflects a closure ratio of 1 part in 103,000. <br />The elevations show a change that reflects a drop in value of <br />0.04 feet on the average. <br />The closures of our elevations using trigonometric leveling have <br />been very good. Errors ranging from 0.10 feet to no error. <br />