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® from the location of the failed test, or to the end of the <br />weld. <br />• Obtain a small sample at both locations for an additional <br />field test. <br />® If these additional test samples pass field tests, then take <br />laboratory samples. <br />• If the laboratory samples pass, then reconstruct the weld <br />or cap between the two test sample locations that bracket <br />the failed test location. <br />• If any sample fails, then repeat the process to establish the <br />zone in which the weld must be reconstructed. <br />F. Acceptable Welded Seams. <br />1. Bracketed by two locations from which samples have passed destructive tests. <br />2. For reconstructed seams exceeding 50 feet, a sample taken from within the <br />reconstructed weld passes destructive testing. <br />3. Whenever a sample fails, provide additional testing for seams that were <br />welded by the same welder and welding apparatus or welded during the same <br />time shift. <br />G. Seams That Cannot Be Non -Destructively Tested. Perform the following: <br />1. If the weld is accessible to testing equipment prior to final installation, <br />non-destructively test the weld prior to final installation. <br />2. If the weld cannot be tested prior to final installation, cap strip the weld. The <br />welding and cap -stripping operations must be observed by the QA/QC <br />CONSULTANT and GEOSYNTHETICS CONTRACTOR for uniformity <br />and completeness. <br />3.5 REPAIR PROCEDURES <br />A. Remove damaged geomembrane and replace with acceptable geomembrane materials <br />if damage cannot be satisfactorily repaired. <br />B. Repair, removal, and replacement is at CONTRACTOR's expense if the damage <br />results from the CONTRACTOR's activities. <br />C. Repair any portion of the geomembrane exhibiting a flaw, or failing a destructive or <br />non-destructive test. Agreement upon the appropriate repair method will be <br />determined between the QA/QC CONSULTANT and the GEOSYNTHETICS <br />CONTRACTOR. Do not commence welding on liner until trial weld test sample, <br />made by that equipment and operator, passes trial test. Repair procedures available <br />include: <br />1. Patching: Used to repair large holes (over 1/4 -inch diameter), tears (over <br />2 -inches -long), undispersed raw materials, and contamination by foreign <br />matter. <br />2. Abrading and re -welding: Used to repair small sections of seams. <br />3. Spot welding or seaming: Used to repair small tears (less than 2 -inches - <br />long), pin holes or other minor, localized flaws. <br />4. Capping: Used to repair long lengths of failed seams. <br />Forward Landfill WMU FU -14 HIGH DENSITY POLYETHYLENE <br />® 02778 20 (HDPE) GEOMEMBRANE <br />