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ameO <br /> 2. If the seam cannot be tested prior to final installation, the seaming operations shall be <br /> observed by CQA Monitor for uniformity and completeness. <br /> E. In the event that seam continuity cannot be demonstrated for a non-destructive test of a fusion <br /> seam as outlined above, the CONTRACTOR shall perform the non-destructive testing over <br /> smaller areas as a means of defining the questionable area. The identified questionable area shall <br /> be capped. Grinding and extrusion welding the overlap is not an acceptable method of repairing a <br /> failed seam length. <br /> 3.09 DESTRUCTIVE TESTING <br /> A. CONTRACTOR shall test a minimum of one destructive test sample per five hundred(500) feet <br /> of seam length from a location specified by CERTIFYING ENGINEER. CONTRACTOR <br /> shall not be informed in advance of the sample location. The samples shall be taken centered over <br /> the seam and prioritized as follows: <br /> 1. A minimum of one sample per day; <br /> 2. All areas identified as suspect during seaming,non-destructive testing/monitoring, and in <br /> unusual working conditions. <br /> 3. A minimum of one sample for each geomembrane seamer. <br /> 4. A minimum of one sample every five hundred(500)feet of seaming. <br /> B. Samples shall be cut by CONTRACTOR as the seaming progresses. Sampling locations shall be <br /> determined by CERTIFYING ENGINEER. CQA Monitor must witness the obtainment of all <br /> destructive test samples by CONTRACTOR. CONTRACTOR shall mark all samples with their <br /> seam number, date, welding machine number, welding technician identification, extruder and <br /> nozzle/wedge temperature, and ambient air temperature. CONTRACTOR shall document the <br /> date, time, roll and seam number, ambient temperature, and pass or fail description. All holes in <br /> the geomembrane resulting from obtaining the seam samples shall be immediately repaired. All <br /> patches shall be vacuum tested. <br /> C. The samples shall be a minimum twelve(12)inches wide by twenty-four(24)inches long with the <br /> seam centered lengthwise. The sample shall be cut into two equal length pieces, half to be given <br /> to CC&V and the other half kept by CONTRACTOR. <br /> D. CONTRACTOR shall cut and test ten (10) one (1) inch wide specimens from his sample. All <br /> testing shall be conducted at room temperature (60' F - 80' F) CONTRACTOR shall test five <br /> (5) specimens for seam shear strength and five (5) for peel strength. Both inside and outside <br /> tracks of fusion seams will be tested for peel strength. To be acceptable, four(4) out of the five <br /> (5)specimens must pass according to criteria established in Article 2.01. Any specimen that fails <br /> through the weld or at the weld/sheet interface shall be considered a failure, unless the weld <br /> strength exceeds the sheet strength, as discussed in Section 2776, Item 2.01. The tensiometer <br /> shall have a grip separation of four (4) 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 (20) inches per <br /> minute for shear and twenty(20)inches per minute for peel. These tests shall not fail according to <br /> the criteria in Article 2.01. <br /> E. CQA Monitor must witness the testing of all destructive samples. Destructive tests will be <br /> performed within two(2)days of the samples being obtained. <br /> Section 02776 Page 19 of 22 May 9,2012 <br /> Geomembrane Revision 1 <br />