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U <br />tunnel created by the weld. <br />iii. Energize the air pump to a minimum pressure of 30 psi or 1/2 <br />psi per mil of liner thickness, whichever is greater, close valve <br />and sustain pressure for at least 5 minutes. <br />iv. If loss of pressure exceeds 2 psi (10 mm mercury), or <br />otherwise approved, or does not stabilize, locate faulty area <br />and repair in accordance with repair procedures described in <br />this specification. <br />V. Puncture opposite end of seam to release air. If blockage is <br />present, locate and test seam on both sides of blockage. <br />vi. Remove needle or other approved pressure feed device and <br />seal the penetration holes. <br />4. Spark Testing for penetrations or other difficult areas not accessible for <br />vacuum testing. <br />a. Equipment and Materials. <br />i. 24 gauge copper wire. <br />ii. Low -amperage electric detector, 20,000 to 30,000 volt, with <br />brush -type electrode capable of causing visible arc up to <br />0 inch from copper wire. <br />b. Procedures. <br />i. Place copper wire within ❑ inch ofthe edge of extrusion seam <br />or clamp seal. <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 />Forward Landfill WMU FU -14 HIGH DENSITY POLYETHYLENE <br />® 02778 18 (HDPE) GEOMEMBRANE <br />