2011-08-30_REVISION - M1977215 (2)

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work day. Each seamer shall make at least one trial seam each day. Seaming operation shall not commence until the CQA Monitor, has determined that the seaming process is meeting the specification requirement and is acceptable. The CQA Monitor shall record the trial weld results on the trial seam log form. Field Seaming - The CQA Monitor shall verify that only approved equipment and personnel perform welding, all welding is performed under suitable conditions as specified in the project Specifications, specified overlaps are achieved, seams are oriented in compliance to project requirements, and that grinding techniques and extrudate meet project requirements for extrusion welding. The CQA Monitor shall record all field seaming on field seaming log forms. Non - Destructive Seam Continuity Testing - The CQA Monitor shall verify that the seams and repair are non - destructively tested by CQC personnel in compliance with the project Specifications. If a seam cannot be tested, the CQA Monitor shall ensure that CQC monitors observe cap strip operations. The CQA Monitor shall verify that test equipment and gauges are functioning properly and that test procedures are in compliance with the project Specifications. The CQA Monitor shall verify that the seams and repairs with failing test results are repaired and /or re- tested until passing results are achieved. The CQA Monitor shall record observed non - destructive test locations on the vacuum test and pressure test log forms. Destructive Seam Testing - The Installer shall obtain samples, at locations selected by the CQA Monitor, of the field seamed geosynthetic approximately 24 inches along and 12 inches across the seam and centered over the seam as follows: • A minimum of one sample per day; • A minimum of one sample for each geosynthetic seamer; • A minimum of one sample every 750 ft of seaming is required unless, in the opinion of the CQA Monitor, the seamer has demonstrated sufficient quality /experience to increase the seam sample interval. In no event shall the sampling interval exceed 1000 ft; and • Seams that appear suspect to the CQA Monitor. The Installer's CQA Monitor shall witness the testing of destructive seam samples by the Installer's CQC personnel. The Installer shall mark all samples with their roll and seam number, date, machine number, welding technician identification, extruder and nozzle /wedge temperature, and ambient air temperature. The Installer shall test all destructive samples in compliance with the project Specifications. Rio Grande Silver Tailings Evaporation Pond 02620 -12 Geosynthetic Liner August2011 02620