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CWDA No. 2 <br />#01349 -0001 Huddleston-Berry <br />07/21/15 (aCn&­1m, & r 6t%. uc <br />The recorded increases in pore pressures at VWP -08 during the spring, summer, and fall 2014 <br />are consistent with the fact that gob placement has occurred in the vicinity of this instrument <br />during that time. Since September 2014, the pore pressures in VWP -08 have changed very little. <br />The current pore pressure reflects a piezometric surface elevation of approximately 6097 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 -n 9 <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 />Site Visit Observations <br />HBET visited the site on June 12, 2015. At the time of our visit, the mine was idle. The <br />windrows of material previously observed in the drying area on top of CWDA No. 2 were not <br />present. No wet material was being transported from the wash plant; however, gob was being <br />moved around and compacted on CWDA No. 2. In general, CWDA No. 2 appeared to be in <br />good condition and no evidence of instability or other adverse conditions were observed. <br />General <br />In general, based upon the results of the recent VWP and inclinometer monitoring data, and upon <br />our observations at the site, HBET does not believe that there is any reduction in the stability of <br />CWDA No. 2. Continued quarterly monitoring of piezometers and inclinometers is <br />recommended. <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, LM01349 -0001 Bowie Mine\200 - Geo \Gob 2\Imtr ntation Monitoring\2015 \01349 -0001 GP2 LR072115.doe 3 <br />