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iv. Examine the geomembrane through the viewing window for <br /> the presence of soap bubbles for a period of not less than <br /> 10 seconds. <br /> V. Mark all areas where soap bubbles appear and repair in <br /> accordance with repair procedures described in this <br /> specification. <br /> 3. Air pressure testing for seaming processes producing a double seam with an <br /> enclosed channel. <br /> a. Equipment, comprised of the following: <br /> i. An air pump (manual or motor driven) equipped with a <br /> pressure gauge capable of generating and sustaining a <br /> pressure over 40 psi and mounted on a cushion to protect the <br /> geomembrane. <br /> ii. A rubber hose with fittings and connections. <br /> iii. A sharp hollow needle, or other approved pressure feed <br /> device. <br /> iv. A pressure gauge with an accuracy of plus or minus 1 psi. <br /> b. Test Procedures. <br /> i. Seal both ends of the welded seam to be tested. <br /> ii. Insert needle or other approved pressure feed device into the <br /> tunnel created by the weld. <br /> ill. Energize the air pump to a minimum pressure of 30 psi or <br /> 2 psi per mil of liner thickness, whichever is greater, close <br /> valve 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 /> FORWARD LANDFILL 02778 <br /> HIGH DENSITY POLYETHYLENE <br /> 19 (HDPE)GEOMEMBRANE <br />