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D E C i 1 4- 9 3 T U E 1 6 4 3 W A T E R W A S T E+ L A N D <br />Larry OaAlar • <br />December 14, 1883 <br />Ppa2 <br />i~ <br />P _ 0 3 <br />Measured field densities were achieved throughout each lift. Previous lifts wire not being <br />scarified prior to placement of successive lifts. This occurred only abo+~d the 8698 <br />(approximate elevation) lift. <br />tlUALITY ASSURANCE TESTING AND REVIEW <br />• Liner Cover <br />The area in Acre 38 where the tested liner cover thickness was approximately 18 inches 124 <br />inch minimum thickness required) was covered with en additional 8 to 12 inches,of material. <br />Additional material was placed over approximately '/~ acre et and around the test area. <br />Additional stockpiles of liner cover material were placed at random locations.around the <br />periphery of the tailings impoundment. These stockpiles are to be used to replace eroded <br />sections of liner cover within the existing impoundment. <br />• Miscellaneous Issues <br />Piezometer installation had not commenced by the time WWL left the sight. llfl'e upstream <br />and downstream faces of the embankment had yet to receive their final grading. An <br />additional trip to the site may be required to verify piezometer installation. <br />The November 301etter from Alana Scott to you is still in the review process. Qimments on <br />the letter will be include in our final report. <br />If you have any questions concerning the information contained in this letter, pNease contact <br />Clint Strachan or me. <br />Yours sincerely, <br />WATER, WASTE & LAND, INC. <br />`~! 0. ~d6s <br />Douglas O. Gibbs, P.E. <br />Project Engineer, Geotechnical/Mining Division <br />