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<br />P:\Projects\0106.071 2025 Resident\J-REPORTS\VLF2 P3 Stage B.1 <br />RoC Page 18 <br />welding method and patches extended at least 6 inches beyond the defect in <br />all directions. <br />All repairs and extrusion welded seams were non-destructively tested using a vacuum <br />box. The area being tested was covered in soapy water and the vacuum box was sealed <br />to the geomembrane. A vacuum was pulled over the area for at least 10 seconds and if <br />no bubbles were present, the test passed. If bubbles were present, the section of weld <br />failed and was marked as a defect. The repair process would then be repeated for the <br />failing vacuum test. Vacuum tests overlapped each other by a minimum of 3 inches. The <br />80-mil defect/repair summary is presented in Appendix I.7. <br />3.4.8. Geomembrane Acceptance <br />Prior to DCFO placement, the geomembrane was accepted by ECA, JHL, CC&V, and the <br />CQA Monitor. All CQA logs and survey data were thoroughly reviewed ensuring that all <br />aspects of the geomembrane installation were performed in accordance with project <br />Technical Specifications. The 80-mil geomembrane acceptance forms are presented in <br />Appendix I.8. <br />4. PROJECT DEVIATIONS <br />Throughout construction, the following deviations from the Design and IFC Drawings were <br />approved by the Engineer of Record: <br /> No geomembrane destructive testing sample was collected on 6/25/25 for machine <br />#1353. This machine was used on 1 seam weld that day, for a total of 13 feet of seam <br />welded. However, two passing trial seams for that welder were tested that day. Over <br />the duration of the project, machine #1353 was used for a total of 1,321 feet of welding <br />with 6 destructive testing samples being taken on those welds, resulting in an average <br />sample frequency of 1 per 220 ft. <br /> <br /> No geomembrane destructive test sample was collected on 7/23/25 for machine #1353. <br />This machine was used on 3 seams weld that day, for a total of 41 feet of seam welded. <br />However, one passing trial seams for that welder were tested that day. Over the <br />duration of the project, machine #1353 was used for a total of 1,321 feet of welding <br />with 6 destructive testing samples being taken on those welds, resulting in an average <br />sample frequency of 1 per 220 ft. <br /> <br /> The final grading for the northwest section of B.1 followed the design, ensuring at least <br />2 percent positive drainage and slopes no steeper than 2:1.All grading was acceptable <br />and not considered a deviation to the original permitted design by the Certifying <br />Engineer. Nevertheless, as a result of the revised grading in the northwest section, <br />design adjustments were required for the High Volume Solution Collection Piping