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<br />P:\Projects\0106.071 2025 Resident\J-REPORTS\VLF2 P3 Stage B.1 <br />RoC Page 17 <br />including welding angle, grinding, and weld/welding rod cleanliness. The CQA <br />Monitor logged the welding machine and welding technician combination, the <br />length of the seam, the direction the seam was welded, time of seaming, the pre-heat <br />temperature, and the welding temperature. Destructive test samples were marked during <br />extrusion seaming and testing is discussed further in Section 3.4.5. All extrusion welded <br />seams were vacuum tested, which is discussed further in Section 3.4.7. Extrusion welding <br />summaries for 80-mil geomembrane are presented in Appendix I.4. <br />3.4.5. Geomembrane Destructive Testing <br />During welding activities destructive test samples were marked at a minimum every 500 <br />linear feet of seam for each welding type and each welding machine/welding technician <br />combination. A 36-inch long by 12-inch-wide sample was cut from the seam centered on <br />the seam lengthwise. The sample was then cut into three 12-inch-long sections. One 12- <br />inch-long section was archived by the CQA Monitor to be tested later, if necessary. Ten 1- <br />inch coupons were then cut from the remaining 12-inch section. Five coupons were tested <br />for shear strength and five coupons were tested for peel strength using a tensiometer. <br />The different failure types and test codes for fusion and extrusion destructive testing are <br />presented on Figures 3 and 4, respectively. All destructive testing was performed by EC <br />Applications in the presence of the CQA Monitor. Within the B.1 limits 136 fusion <br />(Appendix I.5.1) and 22 extrusion (Appendix I.5.2) destructive samples were tested and <br />passed. Tensiometer certifications can be found in Appendix K. <br />3.4.6. Geomembrane Pressure Testing <br />Pressure testing was performed to ensure all fusion welded seams had continuity <br />throughout their entire length. The ends of the seam were sealed and the air channel in <br />the seam was pressurized using a small air compressor to a minimum of 30 pounds per <br />square inch (psi), for a minimum of five minutes. A pressure gauge and needle were used <br />to monitor the air pressure in the seam. If the pressure dropped less than 3 psi, the <br />opposite end of the seam from the pressure gauge was cut. If the needle dropped, <br />continuity was confirmed throughout entire seam length and the test was considered <br />“passing.” If a drop in pressure of more than 3 psi occurred or the continuity was not <br />proven, smaller sections of the seam were tested to delineate the failing section of the <br />seam. All failing seams or portions of seams were repaired, and vacuum tested. Air <br />pressure testing summaries for secondary, primary, and 80-mil geomembrane are <br />presented in Appendix I.6. <br />3.4.7. Geomembrane Defects and Repairs <br />The CQA Monitor constantly inspected the geomembrane for defects from the time it was <br />deployed until it was covered with DCFO. A defect is defined as any item in which a repair <br />is necessary to create a continuously sealed geomembrane layer. All defects were marked <br />with a defect number by the CQA Monitor. Repairs were performed using the extrusion