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Final Construction Quality Assurance Report-WMU FU -13 Forward Landfill • Location and Frequency — GLA's CQA Monitor selected the locations of approximately one sample per 500 linear feet of seam. Within WMU FU -13, a total of 49 destructive samples were collected and tested from approximately 23,200 linear feet of seam, resulting in a frequency of 1 test per 473 linear feet. Additional destructive samples were obtained if there were failures or if there was an indication of overheating, contamination, or other adverse conditions. Sampling Procedure - Comanco cut the samples as directed by GLA's CQA Monitor. GLA'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). GLA's CCW 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 GLA's field laboratory, two samples, one at each end of the actual sample location, were cut for pre -testing. If both specimens passed the pre-test, the sample was taken to the field laboratory for testing. The size of the destructive samples was approximately 12 inches wide by 42 inches long. Laboratory Testing - The destructive 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 GLA's CCW Officer. The results of the destructive seam tests performed by GLA are presented within Appendix I. 5.3.3 Defects and Repair 5.3.3.1 Identification GLA's CCW Monitor checked seams and non -seam areas of the geomembrane for any defects, holes, blisters, undispersed raw materials, and for signs of contamination by foreign matter. Suspect areas were distinctively marked for repair, with a description of the required type of repair and the repair location recorded in the Repair Logs. No additional materials were placed over the geomembrane until GLA's CQA Monitor approved the repair. 25 Geo -Logic ASSOCIATES