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2.05.6(6) <br />(f)(v)(B) Monitoring <br />See tables beginning on page 2.05-173. <br />The hydrologic monitoring program will continue. At least quarterly <br />monitoring will be performed. Surface streams, ponds, springs and <br />groundwater will continue to be monitored. The results of the monitoring will <br />be observed for abrupt changes in water levels, flows or quality which might <br />indicate mining impact. <br />The Operator set up a subsidence network over the first five B -Seam <br />longwall panels to gain as much information as possible to compare actual <br />data with the subsidence predictions presented in Volume IIIA, Exhibits15, <br />17 and 21. Additionally, the actual subsidence data will be utilized to check <br />the design and effectiveness of limited extraction zones. <br />At the request of the DRMS and UDSA-FS the Operator installed eight <br />subsidence monuments in the limited extraction zone along Hubbard Creek <br />(monuments 17-A through 17-H). These monuments were utilized to verify <br />that subsidence does not occur along the limited extraction zone. Six of the <br />monuments were installed during 2001 prior to the November 2002 longwall <br />start-up in panel D-7. Two of the monuments 17-G & 17-H were installed in <br />2009 prior to the initiation of mining in Panel B-9. At the request of the <br />DRMS the Operator has identified twenty (20) subsidence monuments to <br />measure settlement over superimposed multi -seam extraction as follows: <br />------------------------------- <br />�Line <br />'A,B <br />IC <br />D <br />E <br />F <br />'---------'--'--'--'--'--'--'--' <br />24 <br />X <br />;X;X;X; <br />X <br />; X-- <br />�26 X <br />X <br />X <br />X <br />X <br />X27 XX <br />�X <br />'---------'----'--'--'--'--'--' <br />' <br />PRA 4 2.05-168- 03/14 <br />