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C. Mark machine direction on the samples with an arrow. QA/QC <br /> CONSULTANT will be responsible for markings. <br /> d. Sample at a rate of one per batch or one per one hundred <br /> thousand square feet of material supplied, whichever results in <br /> greatest number. <br /> C. Field Testing <br /> 1. General: The GEOSYNTHETICS CONTRACTOR shall non-destructively <br /> test all field seams over their full length using a vacuum test unit,air pressure <br /> (for double fusion seams only), spark testing, or other approved methods. <br /> Perform testing as the seaming progresses and not at the completion of all the <br /> field seaming. Complete all required repairs in accordance with this <br /> specification. The QA/QC CONSULTANT shall be informed when testing <br /> will be performed. <br /> 2. Vacuum test <br /> a. Equipment: <br /> i. A vacuum box assembly consisting of a rigid housing, a <br /> transparent viewing window,a soft neoprene gasket attached <br /> to the bottom, port hole, or valve assembly, and a vacuum <br /> gauge. <br /> ii. A vacuum pump assembly equipped with a pressure control <br /> iii. A rubber pressure/vacuum hose with fittings and connections. <br /> iv. A soapy solution and an applicator. <br /> b. Test Procedures. <br /> ANIL i. Place the box over the wetted seam area(soapy solution). <br /> ii. Ensure that a leak-tight seal is created. <br /> iii. Energize the vacuum pump and reduce the vacuum box <br /> pressure to approximately 10 inches of mercury, i.e., 5 psi <br /> gauge. <br /> 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 /> • Forward Landfill WMU FU-13 HIGH DENSITY POLYETHYLENE <br /> 02778 17 (HDPE) GEOMEMBRANE <br />