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<br />4.1 Maximum Subsidence <br />The following table summarizes the maximum subsidence values observed on the <br />perpendicular monitoring lines along with the average overburden depths for these lines. <br /> <br />Monitoring Line Overburden Thickness <br />{feet) Maximum Subsidence <br />(feet) <br />A-Line (Pane! 2 East) 300 7.5 <br />B-Line (Panel 2 East) 400 7.6 <br />J-Line (Panel 2 East) 920 8.8 <br />S-Line (Panel 1 East) 910 10.2 (1,2) <br />NOTE: <br />(1) Based on surveys from the first half of 1993. <br />(2) The maximum subsidence value for S-Line monument S3 probably reflects <br />influence of the adjacent 2 East longwall panel. <br />J <br />