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C. Seaming Procedures <br />b. Place a smooth insulating plate or fabric beneath hot <br />welding apparatus after usage. <br />c. Use clean and dry welding rods or extrudate pellets. <br />d. Complete grinding process without damaging geosynthetic <br />according to Manufacturer's instructions no more than one <br />(1) hour prior to seaming operations. <br />e. Prevent exposed grinding marks adjacent to an extrusion <br />weld. Do not extend exposed grinding marks more than <br />6 mm from seam area. Design Engineer may request that <br />any and all abraded areas be covered with extrudate. <br />f. • Extrusion weld all cross seam tees to a minimum distance <br />of 100 mm on each side of the tee. <br />g. For extrusion welds, the edge of the top sheet shall be <br />beveled by grinding the edge of the sheet to approximately <br />a 45 degree angle. Extrusion welds cannot be placed on <br />previous extrusion welds. <br />1. General Seaming Procedures <br />a. Areas to be seamed shall be cleaned and free of moisture, <br />debris, or any marking on the geosynthetic. <br />b. Use a flat board, a conveyor belt, or similar hard surface <br />directly under the seam overlap to achieve proper support <br />if required, and remove them once the seam is complete. <br />c. Cut fishmouths or wrinkles at the seam overlap along the <br />ridge of the wrinkle in order to achieve a flat overlap. The <br />cut fishmouths or wrinkles shall be seamed and any <br />portion where the overlap is inadequate shall then be <br />patched with an oval or round patch of the same <br />geosynthetic extending a minimum of 6 inches beyond the <br />cut in all directions. <br />d. Extend seaming to the outside edge of panels placed in <br />the anchor trench. <br />e. Do not field seam without the Seaming Supervisor present. <br />Rio Grande Silver Tailings Evaporation Pond 02620 -17 Geosynthetic Liner <br />August2011 02620 <br />