COMPLIANCE INFO_FINAL WMU FU-23 DESIGN RPT & CONCURRENCE LTRS

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Forward Landfill WMU FU-23 02778 19 HDPE GEOMEMBRANE time shift. G. Seams That Cannot Be Non-Destructively Tested. Perform the following: 1. If the weld is accessible to testing equipment prior to final installation, non-destructively test the weld prior to final installation. 2. If the weld cannot be tested prior to final installation, cap strip the weld. The welding and cap-stripping operations must be observed by the QA/QC CONSULTANT and GEOSYNTHETICS CONTRACTOR for uniformity and completeness. 3.5 REPAIR PROCEDURES A. Remove damaged geomembrane and replace with acceptable geomembrane materials if damage cannot be satisfactorily repaired. B. Repair, removal, and replacement is at CONTRACTOR's expense if the damage results from the CONTRACTOR's activities. C. Repair any portion of the geomembrane exhibiting a flaw or failing a destructive or non-destructive test. Agreement upon the appropriate repair method will be determined between the QA/QC CONSULTANT and the GEOSYNTHETICS CONTRACTOR. Do not commence welding on liner until trial weld test sample, made by that equipment and operator, passes trial test. Repair procedures available include: 1. Patching: Used to repair large holes (over 1/4-inch diameter), tears (over 2-inches-long), undispersed raw materials, and contamination by foreign matter. 2. Abrading and re-welding: Used to repair small sections of seams. 3. Spot welding or seaming: Used to repair small tears (less than 2-inches-long), pin holes or other minor, localized flaws. 4. Capping: Used to repair long lengths of failed seams. 5. Removing the seam and replacing with a strip of new material. D. In addition, satisfy the following procedures: 1. Abrade geomembrane surfaces to be repaired (extrusion welds only) no more than one (1) hour prior to the repair. 2. Clean and dry all surfaces at the time of repair. 3. The repair procedures, materials, and techniques must be accepted in advance of the specific repair by the QA/QC CONSULTANT and the GEOSYNTHETICS CONTRACTOR. 4. Extend patches or caps at least 6 inches beyond the edge of the defect, and round all corners of material to be patched and the patches to a radius of at least 3 inches. 5. Unless otherwise instructed by the OWNER, cut geomembrane below large caps to avoid water or gas collection between the sheets. E. Verification of repair: 1. Number and log each repair. 2. Non-destructively test each repair using methods specified in Article 3.4 of this Section.