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The shear and peel tests were performed in the field in accordance with ASTM D-6392. If the start-up weld sample failed to meet the project specifications, the welding technician and supervisor were notified and advised to take corrective action or put that machine out of service. The CQA monitor documented the trial welds, which included the date, time, temperature, machine number, technician, and results of the shear and peel testing. The geomembrane start-up trial weld Trial Weld Logs are presented in Appendix 1. Non -Destructive Seam Testing: After seaming of the panels was completed, the Contractor's QC technician and Vector's CQA Monitor inspected the seams and panels for defects. The QC technician marked defective seams or tears, holes, non -dispersed resin beads or other defects for repair. The air pressure test method was used for double wedge -welded seams and the vacuum box for extruded seams for seam continuity testing. Vector's CQA Monitor observed the non-destructive seam continuity testing and repairs performed by Comanco to ensure that the seams were satisfactory. The air pressure test logs for the wedge -welded seams are presented in the seaming log in Appendix I. Destructive Seam Testing: General - In addition to non-destructive testing, destructive samples were obtained at random locations to evaluate seam strength and integrity. The samples were tested for shear strength and peel strength (ASTM D6392). Location and Frequency — Ausenco Vector's CQA Monitor selected the locations of approximately one sample per 500 linear feet of seam. Within the Central Portion of WMU FU -10, a total of 35 destructive samples were collected and tested from approximately 24,439 linear feet of seam, resulting in a frequency of 1 test per 499 linear feet. Additional destructive samples were obtained if there were failures or if there was an indication of overheating, contamination, or other adverse Isconditions. Sampling Procedure - Comanco cut the samples as directed by Ausenco Vector's CQA Monitor. Vector's CQA Monitor observed the cutting and assigned sample numbers, and reviewed sample information (sample number, seam number, seaming apparatus, operator identification, location, date, and time welded). Vectors CQA Monitor recorded the samples collected and sample location on the panel layout drawing. The holes in the geomembrane resulting from destructive seam sampling were covered by Comanco immediately after sampling. The repair was completed by placing an extrusion welded patch of the same material. The continuity of the new seams in the repaired area was tested with the same procedure as described in the vacuum box testing procedures discussed previously. Size of Samples - Prior to testing in the laboratory, two samples, one at each end of the actual sample location, were cut for field-testing. If both specimens passed the field test, the sample was taken to the laboratory for testing. The size of the destructive samples was approximately 12 inches wide by 42 inches long. Laboratory Testing - The samples were shipped to Precision Laboratories for destructive testing of the seam. The samples were tested with a certified, calibrated tensiometer according to the requirements of ASTM D-6392. After seam strength tests for the destructive samples were obtained, the results were given verbally to the Contractor and were also reviewed by Ausenco Vectors CQA Officer. The results of the destructive seam tests performed by Ausenco Vector are presented within Appendix I. Date: October 2010 USVC0004800 Final Construction Quality Assurance Report 21