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Upper Northern Portion of WMU FU-08 September 2009 Forward Landfill Project No.021605.09 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 C. 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 — Vector's CA Monitor selected the locations of approximately one sample per 500 linear feet of seam. Within the northern portion of WMU FU-08 a total of five (5) destructive samples were collected and tested from approximately 2,177 linear feet of seam, resulting in a frequency of 1 test per 435 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 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). Vector's 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 Vector Engineering,Inc. • 143E Spring Hill Drive•Grass Valley,CA 95945•(530)272-2448 -13-