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October 2001 -25- 003-2182.004 <br /> Prior to the deployment of geomembrane, Golder and Poly-Flex verified that the subgrade was <br /> free of soft spots, protrusions, angular particles, abrupt grade changes, and loose soil. Golder <br /> and Poly-Flex verified that the Soil Liner Fill surface had been proof-rolled, and was free of <br /> desiccation cracks. Where the surface of the Soil Liner Fill appeared rough, Ames spread a thin <br /> layer of fines from screened Cameron tailings over the area. Poly-Flex provided written <br /> certification of geomembrane subgrade acceptance. The subgrade acceptance certificates are <br /> presented in Appendix F. <br /> Golder assigned each geomembrane panel a consecutive number. Smooth 80-mil LLDPE <br /> geomembrane panels deployed in the External Pond were designated by L-1 through L-90, <br /> single-sided textured 80-mil HDPE geomembrane panels were designated by U-13, 28, 31, 36, <br /> 42, 46, 54, 55, 58, 59, 69, 78, double-sided textured 80-mil HDPE geomembrane panels were <br /> designated by U-93, 94, 95, and smooth 80-mil HDPE geomembrane panels were designated <br /> by the remaining panel numbers in the range of U-1 through U-92. Golder marked the panel <br /> designation and roll number directly on each panel after it was deployed. The geomembrane <br /> record drawing, showing the geomembrane panel lay out, is presented in Drawing No. 3, <br /> Appendix A. <br /> During geomembrane deployment, Golder measured sheet thickness with a micrometer. Golder <br /> measured sheet thickness at five random locations along one edge and two random locations <br /> along the leading edge of each geomembrane roll. The nominal thickness specified for the 80- <br /> mil geomembrane was 80 mil. Project specifications required that the average of the five <br /> thickness measurements be no less than the nominal thickness 80 mil, and that no individual <br /> measurement be less than nominal thickness minus 8 mil (i.e., 72 mil). The thickness <br /> monitoring provided by Golder indicated that all of the panels met or exceeded project <br /> requirements. <br /> I\00\2182\EXTERNAL POND RPTVINALDOC Golder Associates <br />