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CERTIIYING ENGINEER must witness the obtainment of all destructive test samples by <br />CONTRACTOR. CONTRACTOR shall mark all samples with their seam number, date, <br />welding machine number, welding technician identification, extruder and nozzle/wedge <br />temperature, and ambient air temperature. CONTRACTOR shall document the date, <br />time, roll and seam number, ambient temperature, and pass or fail description. All holes <br />in the geomembrane resulting from obtaining the seam samples shall be immediately <br />repaired. All patches shall be vacuum tested. <br />C. The samples shall be a minimum twelve (121 inches wide by twenty-four (241 inches <br />long with the seam centered lengthwise. The sample shall be cut into two equal length <br />pieces, half to be given to OWNER and the other half kept by CONTRACTOR. <br />D. CONTRACTOR shall cut and test ten (101 one (1I inch wide specimens from his sample. <br />All testing shall be conducted at room temperature 160° F - 80° F) CONTRACTOR shall <br />test five 151 specimens for seam shear strength and five IS) for peel strength. Both <br />inside and outside tracks of fusion seams will be tested for peel strength. To be <br />acceptable, four j4) out of the five (5) specimens must pass according to criteria <br />established in Article 2.01. Any specimen that fails through the weld or at the <br />weld/sheet interface shall be considered a failure, unless the weld strength exceeds the <br />sheet strength, as discussed in Section 2776, Item 2.Ot. The tensiometer shall have <br />a grip separation of four 14) inches plus the width of the seam. The seam is to be <br />centered between the clamps. The grip separation rates for LLDPE are twenty 1201 <br />inches per minute for shear and twenty (201 inches per minute for peel. The grip <br />separation rates for HDPE are two 12) inches per minute for shear and two 121 inches <br />per minute for peel. These tests shall not fail according to the criteria in Article 2.01. <br />E. MANAGER must witness the testing of all destructive samples. Destructive tests will <br />be performed within two (2) days of the samples being obtained. <br />F. Failing tests shall be subjected to additional testing until a passing area is found. A <br />passing area is defined as a seam(s) bounded at each end by a passing destructive test. <br />Seams will he tracked in each direction until a passing destructive test is found or until <br />a previous passing destructive test is reached. Seams will be tracked according to the <br />welding apparatus and the machine operator. The following procedures shall apply <br />whenever a sample tails the field destructive test: <br />1. CONTRACTOR can retrace the welding path to an intermediate location lot a <br />minimum of ten (101 feet from the location of the tailed test), at MANAGER'S <br />and CERTIFYING ENGINEER discretion, and take a small sample for an <br />additional field test. It this test passes, then the seam shall be cap stripped <br />between that location and the original failed location. If the test fails, the <br />process shall be repeated. <br />2. Over the length of seam failure, CONTRACTOR shall either cut out the old <br />seam, reposition the panel and reseam, or add a cap strip, as required by <br />MANAGER and CERTIFYING ENGINEER . <br />3. After reseaming or placement of the cap strip, additional destructive field testlsl <br />shall be taken within the reseamed area. The reseamed sample shall be found <br />acceptable if test rasulu are approved by MANAGER and CER7lFY1NG <br />... ENGJNEER. 1f test results are not acceptable, this process shall be repeated <br />March 26, 1996 Section 02776.0 <br />02778.0.21 Geomembrene <br />Revision 4 <br />