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A vacuum box assembly constructed from clear transparent plastic with a soft neoprene <br /> gasket attached to the bottom and a gauge to indicate vacuum chamber pressure. <br /> A vacuum motor capable of creating a vacuum of 2.5 to 3 psi. <br /> A bucket and wide brush, mop or spray assembly. <br /> A soapy solution. <br /> Procedure: <br /> Wet a strip of geomembrane approximately 12 inches by 48 inches(0.3 m by <br /> 1.2 m)with the soapy solution; <br /> Place the box over the wetted area. <br /> Energize the vacuum apparatus; confirm 2.5 to 3psi. <br /> Ensure that a leak tight seal is created. <br /> For a period of approximately 5 to 10 seconds, examine the geomembrane through the <br /> viewing window for the presence of soap bubbles. <br /> All areas where soap bubbles appear shall be marked and repaired in accordance <br /> with Section 3.4. <br /> If no bubbles appear, the vacuum shall be disengaged and the box indexed to the next <br /> test area with a minimum 6"overlap between indexes,and the process repeated. <br /> Vacuum tested seams are recorded on Daily Progress Reports. <br /> 6.2.0 Air Channel Pressure Testing ASTM D 5820 <br /> This method is only applicable to seam continuity testing of air channels produced using <br /> dual track hot wedge welding equipment. <br /> Testing equipment shall be comprised of the following: <br /> An air pump(manual or motor driven)equipped with pressure gauge capable of <br /> generating and sustaining a pressure between 25 and 30 psi (160 and 200 kPa). <br /> A air hose with fittings and connections. <br /> A sharp hollow needle or other approved pressure feed device. <br /> Procedure: <br /> Seal both ends of the seam to be tested by tack welding and clamping with Vise Grips; <br /> Insert needle into the air test channel created by the fusion weld. <br /> Inflate the channel to pressure 30 psi (210 kPa), <br /> close pressurized air source valve and monitor air pressure drop for five(5)minutes. <br /> Created by Colorado Lining International 1-800-524-8672 9 <br />