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<br />Page 17 <br />Northern <br />Coal <br />]Company <br />CURTIS CREEK SUBSIDENCE ASOh~]MENTS <br />Fourteenth week of weekly monitoring. Rienau It2, 1st East, 1-Left 3s under Curtis Creek <br />when monitored _ <br /> DIFFERENCE <br /> ORIGINAL PRESENT FROM ORIGINAL <br />I~NUMENT P ELEVATION ELEVATION TO PRESENT <br />8 6,905.36 "' 6,905.41 "~ + 0.05' ~ <br />~ 10 6,905.89'° 6,905.82' ~ - 0.07' / <br />~ I1 6,906.00'/ 6,905.92'/ - 0.08' / <br />I <br />12 <br />6 910.53 ' <br />6,910.36' <br />- 0.17'• <br />13 6,908.90'` 6,908.68'f - 0.22' / <br />14 6,904.20 "" 6,903.92' / - 0.28'/ <br />15 6,900.09' ~ 6,899.78' - 0.31'/ <br />lb 6,907.66' V 6,907.64' - 0.02 "~ <br />17 6,908.33' 6,408.33' / 0.00' <br />1 <br />18 6,909.07' ~ 6,090.07'/ '~~ 0.00', <br />NOTES• - <br />1) Vertical co~rol for monuments are based on the U.S.G.S. Bench Marks H-384 <br />j (6,927.535) and Cr384 (6,381.089j~ <br />Survey done April 24, 1981 <br />Notes are recorded in Book No. 42 on pages 9 through 12. <br />.IB~mjb .. <br />~ pc: File <br />