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June 24, 2003 -30- 003-2203.7 <br />4.2.7.1 Field Monitoring <br />Golder observed BF placement to verify lifr thickness, adequate compaction, acceptable moisture <br />conditions, final compacted thickness, and suitability for geomembrane deployment. Golder <br />identified angular particles and ruts on the fill surface, and brought these features to the attention of <br />Ames for removal or repair. Golder and Poly-Flex approved the final surface of the BF prior to <br />geomembrane deployment. <br />4.2.8 Low Volume Solution Collection Fill <br />Golder provided visual monitoring of LVSCF 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 LVSCF 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 LVSCF placement, and marked aeeas on the geomembrane liner for repair, if <br />required. After final grading, Golder monitored removal of PVC grade markers. <br />On December 5, 2002, a 2-foot diameter boulder rolled down the south side of the 2H:1V riser slope, <br />damaging the lower geomembrane liner. On December 10, 2002, a 2-foot diameter piece of ore <br />material rolled down the northern side of the 2H:1 V riser slope damaging the lower geomembrane <br />liner. Golder inspected the geomembrane and identified all damaged locations. Poly-Flex repaired <br />the damage on December 13, followed by non-destructive vacuum testing on December 14, 2002. <br />Documentation of the repairs and tests are reported in the Phase Nb PSSA seam, defect and testing <br />logs presented in Appendix K. <br />On January 20, 2003, a Caterpillar D9 wide-pad dozer damaged the lower 100-mil single-sided <br />textured geomembrane in the Phase IVb PSSA near panels L-351, L-354, and L-355. Ames used a <br />Caterpillar 330 excavator on January 20 and 21 to remove LVSCF from the area where the <br />geomembrane damage occurred. CC&V performed temporary geomembrane repairs on these <br />damaged areas on January 23, 2003. The temporary repairs were surveyed and not coveted with <br />LVSCF until Poly-Flex permanently repaired the damage on April 17, 2003. Documentation of the <br />repairs and tests aze reported in the Phase IVb PSSA seam, defect and testing logs presented in <br />Appendix K, and a copy of the letter summarizing the repair work is presented in Appendix R. <br />^~ao~zzosoaoo~rmc.nessaoso3wozz:m.oaoo.o~narsepeoc Golder Associates <br />