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~ , <br />t <br />No. (ft) (ft) <br />1 462.50 170.00 <br />2 467.50 169.94 <br />3 472.50 170.06 <br />4 477.49 170.36 <br />5 482.47 170.85 <br />6 487.42 171.52 <br />7 492.35 172.38 <br />8 497.24 173.41 <br />9 502.09 174.63 <br />10 506.89 176.02 <br />11 511.64 177.59 <br />12 516.33 179.33 <br />13 520.95 181.24 <br />14 525.49 183.32 <br />15 529.96 185.57 <br />16 534.34 187.98 <br />17 538.63 190.55 <br />18 542.82 193.27 <br />19 546.91 196.15 <br />20 550.89 199.18 <br />21 554.75 202.35 <br />22 557.75 205.00 <br />*** 1.841 *** <br />Failure Surface Specified By 20 Coordinate Points <br />Point X-Surf Y-Surf <br />No. (ft) (ft) <br />1 475.00 172.50 <br />2 480.00 172.62 <br />3 484.99 172.94 <br />4 489.96 173.44 <br />5 494.92 174.13 <br />6 499.84 175.01 <br />7 504.72 176.08 <br />8 509.56 177.33 <br />9 514.35 178.77 <br />10 519.08 180.39 <br />11 523.75 182.18 <br />12 528.34 184.16 <br />13 532.86 186.30 <br />14 537.29 188.62 <br />15 541.63 191.10 <br />16 545.87 193.75 <br />17 550.01 196.56 <br />18 554.04 199.52 <br />19 557.95 202.63 <br />20 560.71 2.05.00 <br />*** 1.861 *** <br />