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<br />' San Luie Project Ptwe n Raise 1 Expansion -Final Conewction Report <br />' sides and tested. In only one instance, these additional samples also failed the destructive test. In <br />' this case, further samples were obtained and tested which resulted in the determination that a large <br />portion of the entire seam was inadequate to meet the specified seam sVength. This seam was the <br />first seam of the day welded by one of the seam welding machines and destructive testing of the next <br />' seam welded by this machine indicated passing test results. <br />' Where the destructive seam samples failed, the liner panel overlap remaining after wedge welding <br />was extrusion welded and capped at both ends to complete the seam. For non-destructive test <br />' failures, the faulty areas were sealed by extrusion welding or covered with a welded liner cap, <br />depending on their size. The frequency of non-destructive failures was within the lower end of the <br />range typical for geomembrane liner installations with an average of one defect or leak for <br />' approximately every 230 ft of seam. <br />' The wedge welded panel seams between 40 mil and SO-60 mil geomembrane are designated as seams <br />308/309 and 330/331. Asper the additional seam testing requirements of TR-14, the following was <br />' recorded. <br />On November 1, 1993, seam 308/309 was wedge welded and passed the routine QA/QC air pressure <br />' test; a destructive test sample (No. 141) was taken and tested by Serrot Corporation and SRK with <br />passing results. On November 5, 1993, seam 308/309 passed the sewnd air pressure test as <br />' specified by TR-14; a second destructive test sample (Special Sample No. 1) was taken and tested <br />by SRK with passing resulu. <br />' On November 3, 1993, seam 330/331 was wedge welded and passed the routine QA/QC air pressure <br />test; a destructive test sample (No. 173) was taken and tested by Serrot Corporapon and S1tK with <br />' passing results. On November 6, 1993, seam 330/331 passed the second air pressure test as <br />specified by TR-14; a second destructive test sample (Special Sample No. 3) was taken and tested <br />' by SRK with passing results. <br />Following the intent of the TR-14 conditions, but not required by TR-14, the extrusion weld <br />between the Phase I 40 mil VLDPE and the Phase II 50-60 mil VLDPE underwent additional testing <br />after three days of expansion and contraction conditions. On November 2, 1993, seam 308-331/tie- <br />' in was extrusion welded and passed the routine QA/QC vacuum test; a destructive test sample (No. <br />190) was taken at the 327/tie-in and tested by Serrot Corporation and SRK with passing results. On <br />' °Y 19 Ject o. __ <br /> <br />