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August 2002 -37- 003 -2203 <br />► Verification of factory roll number and receipt of complete certification prior <br />to allowing deployment; <br />► Measurement of sheet thickness; <br />► Documentation of deployed panel lengths; <br />► Development of panel layout record drawing; and <br />► Observation of Phase IVa/Phase I tie -in. <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 SLF surface had been proof - rolled, and was free of desiccation <br />cracks. Where the surface of the SLF appeared rough, Ames spread a thin layer of fines of <br />Portland Tailing from below Pad No. 3 over the area. Poly -Flex provided written certification <br />of geomembrane subgrade acceptance. The subgrade acceptance certificates are presented in <br />0 Appendix G. <br />Golder assigned each geomembrane panel a consecutive number. Single -sided textured 80 -mil <br />geomembrane panels deployed in the OSA were designated by P -1 through P-470. Golder <br />marked the panel designation and roll number directly on each panel after it was deployed. The <br />geomembrane record drawing, showing the geomembrane panel layout and destructive testing, <br />is presented in Record Drawing No. 5, 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 of each geomembrane panel. <br />The average thickness specified for the 80 -mil geomembrane was 80 -mil. Project specifications <br />required that the average of the five thickness measurements be no less than the 80 -mil, and that <br />no individual measurement be less than nominal thickness minus 8 -mil (i.e., 72 mil). The <br />thickness monitoring provided by Golder indicated that all of the panels met or exceeded <br />project requirements. <br />49 <br />1• 10012203% 04001CcnP4p080210032203 :0400.04740W -doe Golder Associates <br />