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D. Field Trial Seams <br />1. Trial seams shall be conducted at the beginning of each seaming <br />period and within thirty (30) minutes of commencement of <br />seaming, at the Design Engineer 's discretion, and immediately <br />following any work stoppage (i.e., lunch, weather conditions, etc.) <br />of thirty (30) minutes or more for each seaming apparatus used <br />that day. Each Seamer shall make at least one trial seam each <br />day. <br />2. Testing shall include visual observation of a trial seam on the <br />geosynthetic material. The Installer will mark the trial seam with <br />date, ambient air temperature, welding machine number, welding <br />technician identification, and machine temperature and speed. <br />For extrusion welding, the Installer will include the nozzle and <br />extrusion settings and welding technician identification. The <br />remainder of trial seam should be cut in two pieces; one to be <br />retained in Rio Grande Silver's archive; and one to be retained by <br />the Installer. <br />3. All trial seams shall be made at a location selected by the Design <br />Engineer in the area of the seaming and in contact with the <br />subgrade. The trial seam samples shall be 10 ft long for fusion <br />seaming and 5 ft long for extrusion seaming, with the seam <br />centered lengthwise. Specimens 1 inch wide shall be cut from <br />opposite ends of the test seam by Contractor. Contractor shall <br />use a tensiometer to test these specimens for shear and peel. <br />Both inside and outside tracks of fusion welds will be tested for <br />peel. For both fusion and extrusion welds, two (2) coupons will be <br />tested for peel and one (1) coupon for shear. The tensiometer <br />shall have a grip separation of 4 inches plus the width of the <br />seam. The seam is to be centered between the clamps. The grip <br />separation rates for LLDPE are twenty (20) inches per minute for <br />shear and twenty (20) inches per minute for peel. These tests <br />shall not fail according to the criteria in Section 2.01. A break <br />through the weld or at the weld /sheet interface shall be considered <br />a failure in both shear and peel strength tests unless the weld <br />strength exceeds the sheet strength, as discussed in Section 2.01. <br />If a trial seam fails to meet field seam Specifications, the seaming <br />apparatus and /or seamer shall not be accepted and shall not be <br />used for seaming until the deficiencies are corrected and two <br />consecutive successful full trial seams are achieved. <br />4. Contractor shall mark the test weld with date, ambient <br />temperature, welding machine number, welding technician <br />identification, machine temperature, and speed. For extrusion <br />welding, Contractor shall record the nozzle and extrusion settings. <br />Rio Grande Silver Tailings Evaporation Pond 02620 -18 ^ Geosynthetic Liner <br />August 2011 02620 <br />