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CWDA No.2 fGINE�c <br /> #01349-0001 \ Huddleston-Berry <br /> 1 0/16/19 �\ c Engineering&Testing,LLC <br /> _COS <br /> The current pore pressure reflects a piezometric surface elevation of approximately 6096 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 /> 0 � <br /> 3 010 <br /> 0000.04W•090 ! <br /> SOH AL�. <br /> Michael A. Berry, P.E. <br /> Vice President of Engineering <br /> Z:\2008 ALL PROJECTS\01349-Bowie Resources,LLC\01349-0001 Bowie Mine REVISED\200-Geo\Gob 2\Instrumentation Monitoring\2019\01349-0001 GP2 3rdQ 2019 L101619.doc 3 <br />