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ii. Low-amperage electric detector, 20,000 to 30,000 volt, with <br /> brush-type electrode capable of causing visible arc up to <br /> 3 inches from copper wire. <br /> b. Procedures. <br /> i. Place copper wire within 3 inches of the edge of extrusion <br /> seam or clamp sea] <br /> ii. Pass electrode over seam or clamp area and observe for spark. <br /> If a spark is detected perform a repair. <br /> 5. Destructive Testing. <br /> a. Location and Frequency of Testing. <br /> i. The QA/QC CONSULTANT shall collect destructive test <br /> samples at a minimum frequency of one test location per <br /> 500 feet of seam length. <br /> ii. Determine test locations during welding. Locations may be <br /> prompted by suspicion or excess crystallinity,contamination, <br /> offset welds, or suspected defect. The QA/QC <br /> CONSULTANT will be responsible for choosing the <br /> locations and will not notify installer in advance of selecting <br /> locations where weld samples will be taken. <br /> iii. The QA/QC CONSULTANT may increase the test frequency <br /> based on marginal results. <br /> b. Sampling Procedures. <br /> i. The GEOSYNTHETICS CONTRACTOR shall cut samples <br /> at locations designated by the QA/QC CONSULTANT as the <br /> welding progresses. Verify that laboratory test results have <br /> been obtained before the geomembrane is covered by another <br /> material. <br /> ii. The QA/QC CONSULTANT will number each sample and <br /> mark sample number and location in compliance with the <br /> CQA program. <br /> iii. The GEOSYNTHETICS CONTRACTOR shall immediately <br /> repair all holes in the geomembrane resulting from destructive <br /> test sampling. Repair in accordance with repair procedures <br /> described in this Section. Test the continuity of the repair in <br /> accordance with this Section. <br /> FORWARD LANDFILL 02778 <br /> HIGH DENSITY POLYETHYLENE <br /> 20 (HDPE)GEOMEMBRANE <br />