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<br /> <br />Letter to Mike Reefer Z February 11, 1999 <br />3. In amendment AM-OS to the Morrison Quarry reclamation permit, CAMUS Colorado committed <br />to apprising DMG of fill slope construction schedules to allow inspections of fill slope construction <br />at critical milestones. Based on the DMG's review of the design report, it appears that the <br />construction report that will be submitted with the Morrison Quarry annual reclamation report will <br />be adequate to allow the DMG to schedule any necessary inspections of the site with one <br />exception. The DMG will require that a schedule be provided outlining the time period for slope <br />foundation preparation and outlet drain installation so that DMG can inspect these critical features <br />prior to being covered by placement of zone B fill. <br />4. It is stated in the design report that the friction angles for the Jade Air Fines (JAF) and structural <br />fill were determined by direct shear tests and were combined by the appropriate weighted average <br />of the tangents for the determination of the shear strength of the JAF/structural fill atixtures to be <br />used in the construction of the engineered fill slope. The DMG agrees with the design assumption <br />inherent in this methodology that blending of high shear strength structural fill with lower shear <br />strength JAF will yield an intermediate shear strength fill. However, testing must be conducted to <br />determine the numerical values of the friction angles that result from the blending of the two fill <br />types. It is suggested that shear strength testing be conducted on prepazed samples of the 50/50 and <br />30/70 JAF/structural fill admixtures to determine if the friction angles input to the slope stability <br />analysis contained in the design report are appropriate. <br />If you have any questions about the foregoing list of issues, please do not hesitate to contact me. <br />Sincerely, <br />!'" <br />Allen C. Sorenson <br />Reclamation Specialist <br />cc: Alan Howazd, Haley and Aldrich <br />c:\windowslpersonallmorrison 1R•02.doc <br />