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A. CONTRACTOR shall test a minimum of one destructive test sample per five hundred (500) <br />feet of seam length from a location specified by CERTIFYING ENGINEER. <br />CONTRACTOR shall not be informed in advance of the sample location. The samples shall <br />be taken centered over the seam and prioritized as follows: <br />1. A minimum of one sample per day; <br />2. All azeas identified as suspect during seaming, non-destructive testing/monitoring, <br />and in 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 <br />shall be determined by CERTIFYING ENGINEER. CQA Monitor must wimess the <br />obtainment of all destructive test samples by CONTRACTOR. CONTRACTOR shall mazk <br />all samples with their seam number, date, welding machine number, welding technician <br />identification, extruder and nozzle/wedge temperature, and ambient au temperature. <br />CONTRACTOR shall document the date, time, roll and seam number, ambient temperature, <br />and pass or fail description. All holes in the geomembrane resulting from obtaining the seam <br />samples shall be immediately repaired. All patches shall be vacuum tested. <br />C. The samples shall be a minimum twelve (12) inches wide by twenty-four (24) inches long with <br />the seam centered lengthwise. The sample shall be cut into two equal length pieces, half to be <br />given 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 <br />five (5) specimens for seam shear strength and five (5) for peel strength. Both inside and <br />outside tracks of fusion seams will be tested for peel strength. To be acceptable, four (4) out <br />of the five (5) specimens must pass according to criteria established in Article 2.01. Any <br />specimen that fails through the weld or at the weld sheet interface shall be considered a <br />failure, unless the weld strength exceeds the sheet strength, as discussed in Section 2776, <br />Item 2.01. The tensiometer shall have a grip separation of four (4) inches plus the width of the <br />seam. The seam is to be centered between the clamps. The gip sepazation rates for LLDPE <br />are twenty (20) inches per minute for sheaz and twenty (20) inches per minute for peel. These <br />tests shall not fail according to the criteria in Article 2.01. <br />E. CQA Monitor must wimess the testing of all destructive samples. Destructive tests will be <br />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 passing <br />area is defined as a seam(s) bounded at each end by a passing destructive test. Seams will be <br />tracked in each direction until a passing destructive test is found or until a previous passing <br />destructive test is reached. Seams will be tracked according to the welding apparatus and the <br />machine operator. The following procedures shall apply whenever a sample fails the field <br />destructive test: <br />f`J <br />1. CONTRACTOR can retrace the welding path to an intermediate location (at a <br />minimum of ten (10) feet from the location of the failed test), at CERTIFYING <br />ENGINEER discretion, and take a small sample for an additional field test. If this <br />test passes, then the seam shall be cap stripped between that location and the original <br />failed location. If the test fails, the process shall be repeated. <br />Section 02776 Page IS of20 October 25, 2000 <br />Geomembrane Golder Associates Revision 8 <br />