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2. Ensure that a leak -tight seal is created. <br />3. Energize the vacuum pump and reduce the vacuum box pressure to <br />approximately 10 inches of mercury, i.e., five -psi gauge. <br />4. Examine the geomembrane through the viewing window for the presence of <br />soap bubbles for a period of not less than ten seconds. <br />5. Mark areas where soap bubbles appear and repair in accordance with repair <br />procedures described in this specification. <br />3.14 NON-DESTRUCTIVE AIR PRESSURE TESTING FOR DOUBLE WEDGE WELD <br />A. Equipment: <br />1. An air pump (manual or motor driven) equipped with a pressure gauge capable <br />of generating and sustaining a pressure over 40 psi and mounted on a cushion <br />to protect the geomembrane. <br />2. A rubber hose with fittings and connections. <br />3. A sharp hollow needle or other approved pressure feed device. <br />B. Test Procedures. <br />1. Seal both ends of the welded seam to be tested. <br />2. Insert needle or other approved pressure feed device into the tunnel created by <br />the weld. <br />3. Energize the air pump to a minimum pressure of 30 psi and maintain this <br />pressure for 5 minutes, then close the valve. Then, allow five minutes <br />relaxation time. During the relaxation time the air pressure cannot drop more <br />than 2 psi. <br />4. If the testing equipment is not able to hold the 30 psi pressure (i.e., leaking <br />needle) reduce the pressure in 2 psi increments until the equipment can sustain <br />the pressure. <br />5. If loss of pressure exceeds 2 psi, or an otherwise approved pressure drop, or <br />' does not stabilize, locate faulty seam area and repair in accordance with repair <br />procedures described in this specification. <br />SHAW ENV/RONMENTAL, /Nc. <br />San Joaquin County —Extension of Cap Corral Hollow Sanitary Landfill — CH Closure Cap Ext Noj_Technical Specs -4-19-12 Revl.DocReV. 0, 04/05/2012 <br />LLDPE Geomembrane <br />1 02779-16 <br />