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William A. Bear <br />Page 2of2 <br />July 7, 2014 <br />report is attached to a cover report prepared by Huddleston -Berry Engineering & Testing <br />(HBET). The HBET report is then submitted to the Division by J.E. Stover & Associates. <br />The VWP report for April, dated May 8, 2014, showed little change (compared with those for <br />the 1s' Qtr 2014) in the values reported for the five VWPs that are currently functioning. For <br />May, however, historic values for VWP -08, -09, and -10 were revised to reflect corrections <br />made by Buckhorn to the calibration factors used in that company's spreadsheet. The <br />correction is significant for VWP -08, and results in there being a much larger margin of safety at <br />this installation. Specifically, the pore pressure reported for 4/21/2014 is now reduced from <br />12.6 psi to 8.7 psi. An increase of 7 psi rather than just 3 psi would now be required to push the <br />pile to an unacceptably low FoS. <br />With the May 2014 VWP monitoring report, HBET recommends that quarterly monitoring be re- <br />implemented, and does not believe that ongoing monthly monitoring is warranted. The <br />Division will review the VWP monitoring data for June when it is submitted. If the data trends <br />appear to be consistent with what was reported for April and May, then reverting to quarterly <br />monitoring is likely an appropriate response. <br />In the June 11, 2014 HBET cover to BRL, certain table entries have not been copied faithfully <br />from the Table 2 of the May 27, 2014 Buckhorn attachment. Values dated 4/21/14 for VWP -05, <br />-06 and -10 and 5/21/14 for VWP -06 are not consistent with the Buckhorn values, and should <br />be revised. <br />If you have any questions or need additional information, please contact me. <br />Sincerely, <br />Susan L. Burgmaier <br />Environmental Protection Specialist <br />cc: Tamme Bishop, J.E. Stover & Associates <br />Marcia Talvitie, DRMS <br />