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vertical elevation calculation. <br /> Based on this calculation, any elevation changes of a magnitude less than <br /> 0.1 ft could be the result of surveying. Any elevation changes in excess of 0.1 <br /> ft are most probably subsidence related. <br /> The subsidence survey data indicate that points that are within the area of <br /> , 4 <br /> Influence of recent active mining have subsided. Points above old mined-out <br /> y4 <br /> areas have not subsided. The data indicate that the ground surface above old <br /> workings mined prior to 1981 is stable. The data Indicate that the surveying <br /> method is valid. The data also indicate that the monument construction utilized <br /> In the Coal Basin area is sufficiently robust to withstand the rigorous climate. <br /> 6.0 RECOMMENDATIONS <br /> The surveying data indicate that areas of Coal Basin outside the area of <br /> Influence of active mining are stable. Therefore, it is recommended that <br /> monitoring in these areas be discontinued. <br /> The August 1983 survey indicates that mining In No. 2 mine has caused <br /> I <br /> subsidence of control point TP-5. 60ecaueTP-5, �s;guti��;,fed ,�s;�;thel�$ gen <br /> y••.: <br /> A. <br /> .'st ""'" or mom i�Fo t nq po i ntsyMC#`1't :MC#`2 nd•-MC#3 + surve�l� contro i -rr 1 hive,t . <br /> p�� �k;,c'tq•4t, F».,�tpr..`:yy.{yy.�y t .a..•�r.- v.: At,•...Ylir, <br /> }a ,.ygie?4ty �'• �F4�' kST."^,,; . .1 'vHyt.ya ,. <br /> b e�asa b`l'Is oiUE (s, I l s: �pr�o +fi ,ufiur.,,a u �i���c��"h �.t�t r` <br /> 9 <br />