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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-13 HIGH DENSITY POLYETHYLENE <br /> 02778 20 (HDPE) GEOMEMBRANE <br />