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Forward Compost Facility Stormwater Improvements <br />02778 18 HDPE GEOMEMBRANE <br />from the location of the failed test, or to the end of the weld.  Obtain a small sample at both locations for an additional field test.  If these additional test samples pass field tests, then take laboratory samples.  If the laboratory samples pass, then reconstruct the weld or cap between the two test sample locations that bracket the failed test location.  If any sample fails, then repeat the process to establish the zone in which the weld must be reconstructed. <br />F. Acceptable Welded Seams. 1. Bracketed by two locations from which samples have passed destructive tests. 2. For reconstructed seams exceeding 50 feet, a sample taken from within the reconstructed weld passes destructive testing. 3. Whenever a sample fails, provide additional testing for seams that were welded by the same welder and welding apparatus or welded during the same time shift. <br />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. <br />B. Repair, removal, and replacement is at CONTRACTOR's expense if the damage results from the CONTRACTOR's activities. <br />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.