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TECHNICAL SPECIFICATIONS <br />following any work stoppage (i.e., lunch, weather conditions, etc.) of 30 minutes or more for each <br />seaming apparatus used that day. Each seamer shall make at least one trial seam each day. <br />2. Testing shall include visual observation of a trial seam on the geomembrane material. The <br />INSTALLER will mark the trial seam with date, ambient air temperature, welding machine <br />number, welding technician identification, and machine temperature and speed. For extrusion <br />welding, the INSTALLER will include the nozzle and extrusion settings and welding technician <br />identification. <br />3. All trial seams shall be made at a location selected by the CERTIFYING ENGINEER in the area <br />of the seaming and in contact with the subgrade. The trial seam samples shall be ten (10) feet long <br />for fusion seaming and five (5) feet long for extrusion seaming, with the seam centered <br />lengthwise. Specimens one (1) inch wide shall be cut from opposite ends of the test seam by <br />CONTRACTOR. CONTRACTOR shall use a tensiometer to test these specimens for shear and <br />peel. Both inside and outside tracks of fusion welds will be tested for peel. For both fusion and <br />extrusion welds, two (2) coupons will be tested for peel and one (1) coupon for shear. The <br />tensiometer shall have a grip separation of four (4) inches plus the width of the seam. The seam is <br />to be centered between the clamps. The grip separation rates for LLDPE are twenty (20) inches <br />per minute for shear and twenty (20) inches per minute for peel. These tests shall not fail <br />according to the criteria in Section 2.01. A break through the weld or at the weld /sheet interface <br />shall be considered a failure in both shear and peel strength tests unless the weld strength exceeds <br />the sheet strength, as discussed in Section 2.01. If a trial seam fails to meet field seam <br />SPECIFICATIONS, the seaming apparatus and /or seamer shall not be accepted and shall not be <br />used for seaming until the deficiencies are corrected and two consecutive successful full trial <br />seams are achieved. <br />4. CONTRACTOR shall mark the test weld with date, ambient temperature, welding machine <br />number, welding technician identification, machine temperature, and speed. For extrusion <br />welding, CONTRACTOR shall record the nozzle and extrusion settings. <br />3.8 NONDESTRUCTIVE TESTING <br />A. CONTRACTOR shall non - destructively test all field seams over their full length. All test equipment <br />shall be furnished by CONTRACTOR. <br />B. The following vacuum box procedures are applicable to extrusion seaming and shall be followed by <br />CONTRACTOR: <br />1. Excess sheet overlap shall be trimmed away. <br />2. Clean the vacuum box window, gasket surfaces and check for leaks. <br />3. Energize the vacuum pump and reduce the tank pressure to approximately 5 psi. <br />4. Wet a strip of geomembrane the approximate dimensions of the vacuum box with the soapy <br />solution. <br />5. Place the box over the wetted area and compress. <br />6. Close the bleed valve and open the vacuum valve. <br />7. Ensure that a leak -tight seal is created. <br />8. For a period of not less than ten (10) seconds, examine the geomembrane through the viewing <br />window for the presence of soap bubbles. <br />9. If no bubbles appear after ten (10) seconds, close the vacuum valve and open the bleed valve, <br />move the box over the next adjoining area with a minimum three (3) inches overlap and repeat the <br />process. <br />Geomembrane August 28, 2013 <br />02776.1 -12 Revision 0 <br />S \Projects \1550 - CC &V Field Slit CQA PSES Bldg \8 0 Project Engineering and Design \8 2 Specificanons\PSES Pipe Rack Liner Extension Specifications \02776 1 Geomembrane docr <br />