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CWDA No. 2 <br />901319 -0001 Huddlestoa•Berry <br />09/02/14 <br />Discussion <br />As indicated in the referenced report, the stability of CWDA No. 2 is sensitive to increases in <br />pore pressures in VWP -08. An increase in the pore pressure of 7 psi in VWP -08 would result in <br />a reduction of the Factor of Safety to below 1.5. <br />The referenced report also evaluated impacts to CWDA No. 2 stability of increases in pore <br />pressures in VWP -06. The analyses indicated that increases of up to 10 psi would not reduce the <br />Factor of Safety to below 1.5. <br />The monitoring data show a moderate increase in pore pressure in VWP -06. This is consistent <br />with the fact that this instrument is closest to the active filling area. <br />The monitoring data also shows a slight increase in pore pressure in VWP -08. However, the <br />total increase in pore pressure in VWP -08 since the analyses included in the referenced report is <br />only 0.7 psi. This is well below the 7 psi threshold for reducing the Factor of Safety to below <br />1.5. <br />In general, based upon the results of the recent pore pressure monitoring data, HBET does not <br />believe that there is any reduction in the stability of CWDA No. 2. In addition, based upon the <br />errors previously identified by BG1 resulting in lower pore pressures in VWP -08, VWP -09, and <br />VWP -10, HBET does not believe that ongoing monthly monitoring is warranted. Quarterly <br />monitoring is 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 />Huddlestou -Berry Engineering and Testing, LLC <br />Michael A. Berry, P,E. <br />Vice President of Engineering <br />X:\2003 ALL PROIF.CTS'01349 -Bwr ie Reseurces, LLC�01319 -0001 Bowie Nlirie�200 - Ge0'Gob 2100339 -{1003 LR09021.1.doc 2 <br />