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Newmont-Cripple Creek&Victor Gold Mine <br /> Technical Specification No.02776-O.DOCX ■ <br /> Squaw Gulch VLF <br /> Project No.475.0106.006 <br /> April 08,2016 <br /> a. For cross seam tees associated with fusion welding, <br /> CONTRACTOR shall patch panel intersections consisting of <br /> three or more panels and extrusion weld to a minimum <br /> distance of 4 inches on each side of patch. The edge of the <br /> sheet shall be ground to a 45' angle prior to welding. <br /> b. Place a protective layer, e.g., insulting plate or fabric, beneath <br /> hot welding apparatus after usage. <br /> C. When subgrade conditions dictate, use a moveable protective <br /> layer directly below each overlap of geomembrane that is to be <br /> seamed to prevent buildup of moisture between sheets and <br /> prevent debris from collecting around pressure rollers. <br /> 3. Remove seaming sheets and excess geomembrane trimmed to provide <br /> required overlap. Use conventional extrusion welding as a secondary <br /> method for seaming between adjacent panels and as a primary <br /> method of welding for detail and repair work. <br /> a. Purge heat-degraded extrudate from barrel of extruder under <br /> the following conditions: <br /> 1. Prior to beginning a seam. <br /> 2. Whenever extruder has been inactive. <br /> b. Place a smooth insulating plate or fabric beneath hot welding <br /> apparatus after usage. <br /> C. Use clean and dry welding rods or extrudate pellets. <br /> d. Complete grinding process without damaging geomembrane <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 weld. <br /> Do not extend exposed grinding marks more than one-quarter <br /> (1/4) inch from seam area. CERTIFYING ENGINEER may request <br /> that any and all abraded areas be covered with extrudate. <br /> f. Extrusion weld all cross seam tees to a minimum distance of <br /> four(4) inches on each side of the tee. <br /> g. For extrusion welds, the edge of the top sheet shall be beveled <br /> by grinding the edge of the sheet to approximately a 45-degree <br /> angle. Extrusion welds cannot be placed on previous extrusion <br /> welds. <br /> C. Seaming Procedures <br /> 1. General Seaming Procedures <br /> Page 14 <br />