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PAGE !'8 <br />1 Northern <br />Coal <br />Company <br />CURTIS CREEK SUBSIDENCE MONUMENTS <br />~, Sixth week of weekly monitoring. Rienau No. 2, 1st East, 2-Right is 140 feet <br />from Curtis Creek when monitored for elevations. - <br />I t '. <br />I ?flNUMENT ~ ELEVATIONS <br />8 6,905.46 <br />10 6,905.90 ' , <br />11 6,906.01' <br />12 6, 910.53'x/ <br />13 6,908.90'`' <br />14 6,904.19' <br />j 15 6,900.12 ' <br />16 6,907.66' <br />17 6, 908.33 "~ <br />18 6,909.07 ' <br />NOTES: <br />i <br />I 1) Vertical control for mo~uments are based on the U.S.G.S. Bench <br />?arks H-384 (6,927.535) and C 384 (6,831.089). <br />I <br />~ Survey done on February 26, 1981. <br />j Notes are recorded in Book X137 on pages 44 through 47. <br />JB/mob <br />pc: File <br />yw <br />' 4 <br />