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Forward Compost Facility Stormwater Improvements <br />02778 15 HDPE GEOMEMBRANE <br />c. Mark machine direction on the samples with an arrow. QA/QC CONSULTANT will be responsible for markings. d. Sample at a rate of one per batch or one per one hundred thousand square feet of material supplied, whichever results in greatest number. <br />C. Field Testing 1. General: The GEOSYNTHETICS CONTRACTOR shall non-destructively test all field seams over their full length using a vacuum test unit, air pressure (for double fusion seams only), spark testing, or other approved methods. Perform testing as the seaming progresses and not at the completion of all the field seaming. Complete all required repairs in accordance with this specification. The QA/QC CONSULTANT shall be informed when testing will be performed. 2. Vacuum test a. Equipment: i. A vacuum box assembly consisting of a rigid housing, a transparent viewing window, a soft neoprene gasket attached to the bottom, port hole, or valve assembly, and a vacuum gauge. ii. A vacuum pump assembly equipped with a pressure control iii. A rubber pressure/vacuum hose with fittings and connections. iv. A soapy solution and an applicator. b. Test Procedures. i. Place the box over the wetted seam area (soapy solution). ii. Ensure that a leak-tight seal is created. iii. Energize the vacuum pump and reduce the vacuum box pressure to approximately 10 inches of mercury, i.e., 5 psi gauge. iv. Examine the geomembrane through the viewing window for the presence of soap bubbles for a period of not less than 10 seconds. v. Mark all areas where soap bubbles appear and repair in accordance with repair procedures described in this specification. 3. Air pressure testing for seaming processes producing a double seam with an enclosed channel. a. Equipment, comprised of the following: i. An air pump (manual or motor driven) equipped with a pressure gauge capable of generating and sustaining a pressure over 40 psi and mounted on a cushion to protect the geomembrane. ii. A rubber hose with fittings and connections. iii. A sharp hollow needle, or other approved pressure feed device. iv. A pressure gauge with an accuracy of plus or minus 1 psi. b. Test Procedures. i. Seal both ends of the welded seam to be tested. ii. Insert needle or other approved pressure feed device into the