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appear, the defect shall be, repaired by extrusion welding and tested by vacuum box and spark detector. If pressure loss is not more than 2 psi, the opposite end of the seam will be punctured to release the air. If a blockage is present, it will be located and tests on both sides of the blockage will be completed. All penetration holes created during testing shall be sealed by patching and extrusion welding. Responsibilities of the Geotechnical CQA Monitors The Geotechnical CQA Monitor/Manager shall: • Observe and record the continuity of all testing. • Record the location seam/panel number, date, time, equipment number, Geotechnical CQA Monitor name, test number, welding technician's name, weld, sheet and ambient temperatures and results of all testing. • Mark the failed areas with a waterproof marker compatible-xith'thr- ming material and inform the Contractor and/or Liner Subcontractor and the Construction Manager of any required repairs. • Observe that all testing is completed in accordance with the Project Specifications. • Observe that all repairs are completed and tested in accordance with the Project Specifications. 6.2.5.2 Destructive Seam Testing Destructive seam tests shall be performed at selected locations. - Tire purpose=of these tests is to evaluate seam strength. Seam strength testing shall be done as the seaming work progresses, not at the completion of all field seaming. Destructive sampling involves samples that have been removed.from-theinstalled field seams by the Contractor/Liner Subcontractor. Test locations shall be determined at the discretion of the Geotechnical CQA Monitors andthe Contractor/Liner Subcontractor shall not be informed in advance of the locations where the seam samples will be made or will be removed. Destructive samples shall be delivered to the Geotechnical CQA Officer by the Contractor/Liner Subcontractor and shipped to the Independent Testing Laboratory. All costs associated with the collection, repair, shipping and testing of destructive samples will be borne by the Contractor/Liner Subcontractor. A minimum of one destructive sample per 500 feet of field seam shall be obtained. This average frequency will be used for the entire installation with the actual frequency of samples based on performance as determined by the Geotechnical CQA Officer. -26- C\2001-048TINAL COVER CQA.DOC\08/20/01 Geologic Associates