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June 24, 2003 -31- 003-2203.7 <br />On or near April 7, 2003, a rock rolled into the PSSA near the riser sump location, damaging the <br />lower 100-mil double-sided textured geomembrane of panel L-426 on the 2H:1V PSSA slope, and <br />damaging the lower 100-mil single-sided textured geomembrane of panel L-436 in the PSSA bottom. <br />On April 17, 2003, Golder inspected the damaged panels, identified damage, and observed repair <br />work conducted by Poly-Flex. Documentation of the repairs and vacuum tests are reported in the <br />Phase IVb PSSA seam, defect and testing logs presented in Appendix K, and a copy of the letter <br />summarizing the repair work is presented in Appendix R. <br />4.2.8.1 Moisture-Density Test Results <br />Golder performed a total of 12 in-place moisture-density tests of LVSCF. Golder compared results of <br />the field moisture content and density tests to the Proctor dry density and optimum moisture content <br />values of material with similar gradation. Proctor dry density and optimum moisture content values <br />for samples with greater than ten percent plus three-quarter-inch material were corrected according to <br />ASTM D4718 to facilitate direct comparison to nucleaz density values. The moisture-density testing <br />frequency was approximately one test per 10,694 cubic yards. No testing frequency was specified. <br />• Nuclear density tests performed for the PSSA LVSCF are summarized in Table 16. <br />4.2.9 Drain Cover Fill <br />Golder provided visual monitoring of DCF placement. One Golder monitor and at least two Ames <br />laborers were present monitoring each dozer, unless two dozers were within approximately 50 feet of <br />each other during DCF placement. Golder verified that wrinkles in the geomembrane did not fold <br />over, that PVC grade markers were placed on a maximum 50-foot by 50-foot grid and at grade <br />breaks, and that unsuitable material was not present in the fill. Golder continuously inspected <br />geomembrane during DCF placement, and marked azeas for repair, if required. Afrer final grading, <br />Golder monitored removal of PVC grade markers. <br />On Wednesday, May 28, 2003, Ames opened about a 1-foot by 1-foot hole in the upper 100-mil <br />single-sided textured geomembrane in the PSSA sump to drain collected precipitation into the <br />LVSCS and allow removal via a submersible pump placed in the LVSCS risers. Water was pumped <br />periodically from the LVSCS risers until the pump cavitated on about May 30, along with repeated <br />pumping efforts thereafter. Poly-Flex repaired and tested the geomembrane on May 30. <br />i <br />~naouzoso.wo~e~iunrssnosoa~ao~x:os.oaoo.a~aun~o.ao~ Golder Associates <br />