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amec <br /> foster <br /> wheeler <br /> Zephyr Gold USA Ltd. PAGE 15 OF 17 <br /> Dawson Gold Project SEC. NO.: <br /> Dawson Filtered Tailings Storage Facility SPECIFICATION 02776.0 <br /> Pre-feasibility Study <br /> TECHNICAL SPECIFICATIONS FOR DATE: (ORIGINAL) <br /> Fremont County, Colorado GEOMEMBRANE 20-October-16 <br /> PROJECT NO.: 74201633 REVISION: A <br /> DATE: 20-Oct-16 <br /> Samples shall be cut by INSTALLER as the seaming progresses. Sampling locations shall be determined <br /> by CQA MONITOR. CQA MONITOR must witness the obtainment of all destructive test samples by <br /> INSTALLER. INSTALLER shall mark all samples with their seam number,date,welding machine number, <br /> welding technician identification, extruder and nozzle/wedge temperature, and ambient air temperature. <br /> INSTALLER shall document the date, time, roll and seam number, ambient temperature, and pass or fail <br /> description. All holes in the geomembrane resulting from obtaining the seam samples shall be immediately <br /> repaired. All patches shall be vacuum tested. <br /> The samples shall be a minimum 12 in wide by 24 in long with the seam centered lengthwise. The sample <br /> shall be cut into two equal length pieces, half to be given to OWNER and the other half kept by INSTALLER. <br /> INSTALLER shall cut and test ten (10) 1 in wide specimens from the destructive test sample. All testing <br /> shall be conducted at room temperature (60°F—80°F). INSTALLER shall test five (5)specimens for seam <br /> shear strength and five (5) for peel strength. Both inside and outside tracks of fusion seams will be tested <br /> for peel strength. To be acceptable, four (4) out of the five (5) specimens must pass according to criteria <br /> established in Article 2.0. Any specimen that fails through the weld or at the weld/sheet interface shall be <br /> considered a failure, unless the weld strength exceeds the sheet strength, as discussed in Article 2.0 of this <br /> Section. The tensiometer shall have a grip separation of 4 inches plus the width of the seam. The seam <br /> is to be centered between the clamps. These tests shall not fail according to the criteria in Article 2.0. <br /> Failing tests shall be subjected to additional testing until a passing area is found. A passing area is defined <br /> as a seam(s) bounded at each end by a passing destructive test. Seams will be tracked in each direction <br /> until a passing destructive test is found or until a previous passing destructive test is reached. Seams will <br /> be tracked according to the welding apparatus and the machine operator. The following procedures shall <br /> apply whenever a sample fails the field destructive test: <br /> • INSTALLER can retrace the welding path to an intermediate location (at a minimum of 10 ft from <br /> the location of the failed test), at CONSTRUCTION MANAGER'S discretion, and take a small <br /> sample for an additional field test. If this test passes,then the seam shall be cap stripped between <br /> that location and the original failed location. If the test fails, the process shall be repeated. <br /> • Over the length of seam failure, INSTALLER shall either cut out the old seam, reposition the panel <br /> and reseam, or add a cap strip, as required by CONSTRUCTION MANAGER. <br /> • After reseaming or placement of the cap strip, additional destructive field test(s) shall be taken <br /> within the reseamed area. The reseamed sample shall be found acceptable if test results are <br /> approved by CONSTRUCTION MANAGER. If test results are not acceptable, this process shall <br /> S:\ZEPHYR MINERALS\DRMS MINE APPLICATION\02776-GEOMEMBRANE.DOCX <br />