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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 /> ❑ inch from copper wire. <br /> b. Procedures. <br /> i. Place copper wire within❑ inch of the 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 Compost Facility Stormwater Improvements <br /> 02778 16 HDPE GEOMEMBRANE <br />