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I <br /> vertical elevation calcula ion. <br /> Based on this calculat on, 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 subsi ence related. <br /> The subsidence survey :ata indicate that points that are within the area of <br /> Influence of recent active ml6ing have subsided. Points above old mined-out <br /> areas have not subsided. he data indicate that the ground surface above old <br /> workings mined prior to 19$1 Is stable. The data indicate that the surveying : <br /> ;i 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 /> Ask 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 surve indicates that mining In No. Z mine has caused <br /> subsidence of control pol t TP-5. itj �Qs, ,helr� <br /> • mon 'o�"i.n.t�"po nts MC#�1°` MCt2�nd # *, su i To <br /> � a �t�4; ?s� i. <br /> 9 <br />