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. N O'J - 2 2- 9 3 M O N 1 6 8 W A T E R W A S T E t L A N D P 0 4 <br />Lorry Oa~lar • <br />November 2Z, 1993 <br />Papa 3 <br />QUALITY ASSURANCE TESTING AND PROCEDURES <br />Current field testing on the embankment fill has included approximately 18 dehsity tests. <br />Tests have been taken et various depths ranging from 1 to 2 feet below the current lift <br />elevation (to verify Compaction at the lower levels of the fill). Currently this 4uantitY of <br />testing is working out to five tests per shift. There are two shifts in a 24 hour period. <br />A review of previous quality assurance field and laboratory testing is in progress, <br />DRAINAGE BLANKET BENEATH SOUTH END OF EMBANKMENT <br />As you mentioned on November 19, and as observed on site, BMRI has requested'to proceed <br />with construction of the embankment raise on the south end of the embankment. Drainage <br />blanket material testing in this area has shown percentage fines values above the~speCification <br />of 35 percent. From observation of the drainage blanket materials in this area and review of <br />the test results, W WL believes that the drainage blanket materials in this area ar cce bl .~_ <br />This is because t a matana s m question wi a covers with embankment raise fill of similar <br />drainage characteristics (and not tailings). Therefore the gradient for flow end permeability <br />across the drainage blanket in this area would not be as critical es the gradient for flow and <br />permeability where the drainage blanket is directly beneath tailings. Cum e i.e/rd~~ ~~~~r F~~rr-rq ~ <br />n: ss.+c' T~ n ~C <br />If you have any questions concerning the information contained in this letter, plisse contact 1 <br />Clint Strechan or me. 1 <br />Yours sincerely, u,~L~ ~ S~c~er.•/, <br />WATER, ~1/ASTE & LAND, INC. 1-I. So~`4-~ rwL <br />Dougtes O. Gibbs, P.E. <br />Project Engineer, Geotechnical/Mining Division <br />DOG:sea <br />