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William A. Bear <br />Page 4 of 4 <br />August 15, 2014 <br />b. Depending upon the rationale provided for using an extremely low MDD (79.5 <br />pcf) as a reference, it may be appropriate to utilize a different Proctor Curve for <br />those four test locations. <br />With respect to the 2nd Qtr 2014 Instrumentation Report, we have two comments: <br />4. The pore pressure at VWP -06 has begun to rise sharply (as shown on Buckhorn's July <br />1, 2014 Figure 2) since the previous reading in May 2014. What pressure for this <br />installation would be a cause for concern for the stability of CWDA #2? <br />5. Given the sharp rise in pore pressure observed at VWP -06 in June, the Division will <br />require that the monthly VWP monitoring frequency be continued, for VWP -06 and <br />VWP -08, at least until the pressures decrease or level out. VWP -05, -09 and -10 <br />can now be monitored just once per quarter. <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 />