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2. Avoid horizontal seams on slopes steeper than 4H:1V unless <br />approved by the Design Engineer. Horizontal or base T -seam or <br />tie -in seams shall be not be within 5 ft of the toe of slopes. Seams <br />shall be aligned to prevent wrinkles and "fishmouths." If a <br />fishmouth or wrinkle is found, it shall be relieved and capped. <br />3. Panels of geosynthetic will have sufficient overlap provided to <br />allow peel tests to be performed on the seam. <br />B. Seaming Method <br />1. The procedure used to temporarily bond adjacent panels together <br />shall not damage the geosynthetic; in particular, the temperature <br />of hot air at the nozzle of any spot welding apparatus shall be <br />controlled such that the geosynthetic is not damaged. <br />2. Contractor shall use double fusion welding as primary method of <br />seaming adjacent field panels. <br />Rio Grande Silver Tailings Evaporation Pond <br />a. For cross seam tees associated with fusion welding, <br />Contractor shall patch panel intersections consisting of <br />three (3) or more panels and extrusion weld to a minimum <br />distance of 4 inches on each side of patch. The edge of <br />the sheet shall be ground to a 45 degree angle prior to <br />welding. <br />b. Place a protective layer, e.g., insulating plate or fabric, <br />beneath hot welding apparatus after usage. <br />c. When subgrade conditions dictate, use a moveable <br />protective layer directly below each overlap of geosynthetic <br />that is to be seamed to prevent buildup of moisture <br />between sheets and prevent debris from collecting around <br />pressure rollers. <br />d. Remove seaming sheets and excess geosynthetic trimmed <br />to provide required overlap. <br />3. Use conventional extrusion welding as a secondary method for <br />seaming between adjacent panels and as a primary method of <br />welding for detail and repair work. <br />a. Purge heat - degraded extrudate from barrel of extruder <br />under the following conditions: <br />1. Prior to beginning a seam; <br />2. Whenever extruder has been inactive. <br />02620 -16 Geosynthetic Liner <br />August 2011 02620 <br />