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<br />MEMO to Berhan Keffelew <br />January 25, 1996 -Cresson TR Review <br />Page 2 <br />5) Geomemb~ane Liner Material -Specification change not significant. <br />6) Cold Weather Seaming -Did not review, since they are not allowed to seam during <br />cold weather anyway. <br />7) Anchor Trench Material - If calculations are correct, this will just be a minor <br />specification change; due to high FOS's. <br />I am bothered by the low friction angles of the Area No. 2 soil liner filllgeomembrane versus the <br />Ironclad soil liner fill/geomembrane during the interface shear strength testing. Especially, test <br />number 6, when smooth HDPE was used. I did not run a slope stability model for test number 6, <br />but I would guess it may not have a sufficient FOS (pseudo-static). If not, maybe the HDPE cannot <br />be installed over the Area No. 2 soil liner fill unless it is textured on one side. <br />I am not able to review the Riser Pump configuration change or the pregnant solution liner <br />configuration or the CQA Plan. <br />In my opinion, based on H. Bruce Humphries' letter dated August 8, 1995, the change in thickness <br />of the Dtain Cover fill and the LVSC5 Fill constitutes a change in the approved design which <br />would, therefore, require the submittal of a permit amendment application. <br />M:1oulgew\RCVicw.jd <br />