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CWDA No. 2 <br />#01349-0001 i Hudd[cston Berry <br />07/19/17 s , gas Th � arc <br />The current pore pressure reflects a piezometric surface elevation of approximately 6098 feet <br />which is much less than the critical elevation of 6113 feet. As a result, HBET does not believe <br />that the measured pore pressures in VWP-08 are any indication of instability in CWDA No. 2. <br />VWP-09 <br />VWP-09 was installed on May 18, 2012 near the toe of CWDA No. 2. The pore pressures <br />recorded at VWP-09 have been fairly steady since installation. This suggests that dewatering of <br />the gob in this area is likely nearly complete. It is anticipated that the pore pressures at VWP-09 <br />will remain fairly steady over time. <br />VWP-10 <br />VWP-10 was installed on May 18, 2014 near the toe of CWDA No. 2. The pore pressures <br />recorded at VWP-10 have been fairly steady since installation. This suggests that dewatering of <br />the gob in this area is likely nearly complete. It is anticipated that the pore pressures at VWP-10 <br />will remain fairly steady over time. <br />General <br />In general, based upon the results of the recent VWP and inclinometer monitoring data, HBET <br />does not believe that there is any reduction in the stability of CWDA No. 2. Due to the limited <br />activity at the mine, HBET recommends that the monitoring frequency be reduced to semi- <br />annually. <br />We are pleased to be of service to your project. Please contact us if you have any questions or <br />comments regarding the contents of this report. <br />Respectfully Submitted: <br />Huddleston -Berry Engineering and Testing, LLC <br />Michael A. Berry, P.E. <br />Vice President of Engineering <br />X:\2008 ALL PROJECTS\01349 -Bowie Resources, LLC\01349-0001 Bowie Mine\200 - Geo\Gob 2\ Instrumentation Monitoring\2017\01349-0001 GP2 2ndQ 2017 L071917.doc 3 <br />