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• <br />3. All trial seams shall be made at a location selected by the CERTIFYING <br />ENGINEER in the azea of the seaming and in contact with the subgade. The trial <br />seam samples shall be ten (10) feet long for fusion seaming and five (5) feet long for <br />extrusion seaming, with the seam centered lengthwise. Specimens one (1) inch wide <br />shall be cut from opposite ends of the test seam by CONTRACTOR. <br />CONTRACTOR shall use a tensiometer to test these specimens for shear and peel. <br />Both inside and outside tracks of fusion welds will be tested fot peel. For both fusion <br />and extrusion welds, two (2) coupons will be tested for peel and one (I) coupon for <br />shear. The tensiometer shall have a grip separation of four (4) inches plus the width <br />of the seam. The seam is to be centered between the clamps. The gip sepazation <br />rates for LLDPE are twenty (20) inches per minute for sheaz and twenty (20) inches <br />per minute for peel. These tests shall not fail according to the criteria in Section <br />2.01. A break through the weld or at the weld sheet interface shall be considered a <br />failure in both shear and peel strength tests unless the weld strength exceeds the sheet <br />strength, as discussed in Section 2.01. [f a trial seam fails to meet field seam <br />SPECIFICATIONS, the seaming apparatus and/or seamer shall not be accepted and <br />shall not be used for seaming until the deficiencies aze corrected and two consecutive <br />successful full trial seams are achieved. <br />4. CONTRACTOR shall mazk the test weld with date, ambient temperature, welding <br />machine number, welding technician identification, machine temperature and speed. <br />For extrusion welding, CONTRACTOR shall record the nozzle and extrusion <br />settings. <br />5. CONTRACTOR shall cut remainder of successful trial seams into two pieces, one <br />to be retained in CC&V's archives and one to be retained by CONTRACTOR. <br />r 1 <br />LJ <br />3.08 NONDESTRUCTIVE TESTING: <br />A. CONTRACTOR shall non-destructively test all field seams over their full length. All test <br />equipment shall be famished by CONTRACTOR. <br />B. The following vacuum box procedures aze applicable to extrusion seaming and shall be <br />followed by CONTRACTOR: <br />I. 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 <br />soapy solution. <br />5. Place the box over [he wetted area and compress. <br />6. Close the bleed valve and open the vacuum valve. <br />7. Ensure that aleck-tight seal is created. <br />• <br />8. For a period of not less than ten (10) seconds, examine the geomembrane through the <br />viewing window for the presence of soap bubbles. <br />Section 02776 Page 16 of 20 October 25, 2000 <br />Geomembrane Golder Associofes Revision 8 <br />I:bP2203\040%CERTAEPo802UPPENDS\APPE\993-209902"1>61Ae.pOC <br />