2003-05-09_REVISION - M1980244 (2)

Home Browse Search

ripple Creek & Victor Gold Mining Company May 7, 2003 Mr. Ron Roberts -2- 033-2203 subgrade damage, until Polyflex returned to the site to perform certifiable repairs and tests on the damaged geomembrane. The interim repairs completed by CC&V consisted of extrusion welds (beads) of small punctures and scratches, and liner patches over the larger penetrations. Figure 2 shows some of the interim patches on the liner. On April 17, Golder inspected the panels and the interim repairs, and identified and observed the following repair work: • Covering of the interim extrusion weld beads with liner patches to provide additional protection to the liner; and • Application of a liner cap over the interim liner patches. The liner cap repair was selected to minimize stress to the liner and provide coverage over the entire damaged area. Figure 3 shows the liner cap placed over this area. Documentation of the liner repairs for this area is detailed in Golder's defect log (Phase IVb PSSA lower geomembrane) 80A through 80F. The repair work documentation will be presented in the Phase IVb PSSA certification report. ROCK DAMAGE REPAIRS The geomembrane damage resulting from the rock incident primarily consisted of puncture penetration to panels L426 and L436 (see Figure 4). Damage to panel L426, on [he PSSA slope, consisted of four puncture penetrations through the liner. The punctures were approximately 6 to 10 inches in diameter In addition to puncturing the geomembrane liner, the underlying SLF surface was damaged. Figure 5 shows a typical liner puncture on this panel. Figure 6 shows the typical damage to the SLF in this area. Damage to panel L436 consisted of ten puncture penetrations in the PSSA sump area. The puncture sizes ranged from less than 0.25 to 6 inches in diameter. The underlying SLF had minor damage. Figure 7 shows typical liner and SLF damage on this panel. On April 17, Golder inspected the damaged panels, and identified and observed the following repair work: • Cutting out the damaged section of liner; • Repairing the underlying SLF surface by filling the depression with SLF and hand compacting and smoothing; • Extrusion welding a liner patch over each damaged area; and • For panel L436, extrusion welding a liner cap over the entire damaged area. Figures 8 through 12 present photographs of the liner repair work on panels L426 and L436. Documentation of the liner repairs for this area is detailed in Golder's defect log (Phase IVb PSSA lower geomembrane) 79A through 790. The repair work documentation will be presented in the Phase IVb PSSA certification report. ceo~xzo3~owov~ssn~.~,armwawoazzozoaw oa~ooa~P a~.~ Golder Associates