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Longwell Subsidence <br />January 20, 1986 <br />Page -2- <br />It would be difficult to differentiate between surface <br />settlement and subsidence except that the subsidence basin is <br />well defined and the settlement is uniform on each side of <br />the subsidence basin. <br />In determining the angle of draw for the "K" row, monuments <br />K-12 and K-20, were chosen to be the end points of the <br />subsidence basin. For the "NPR" row, monument P-3 was chosen <br />as the end point. <br />The angle of draw for these two rows was determi:oed to be: <br />Row Angle of Draw <br />K 15.5 Degrees <br />K Less then 0 degrees <br />NPR 14.5 Degrees <br />Comment <br />Downdip side of gob <br />Updip side of gob <br />Behind gob <br />The monitoring points will again be surveyed i.n March and <br />June of 1986. The results of these two surveys will be <br />submitted with the next semi-annual report. <br />