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C <br />I <br />n <br />fl <br />0 <br />0 <br />i <br />C <br />n <br />0 <br />0 <br />I I <br />C <br />C <br />n <br />11 <br />U <br />u <br />B. Purge welding apparatus of heat -degraded extrudate before welding. <br />C. Bevel top edges of geomembrane a minimum of 45° and full thickness of <br />geomembrane before extrusion welding. <br />D. Clean seam -welding surfaces of oxidation by disc grinder or equivalent not more <br />than 30 minutes before extrusion welding. Change grinding discs frequently. Do not <br />use clogged discs. <br />E. Do not remove more than 4 mils of material when grinding. <br />F. Grind across, not parallel to, welds. <br />G. Cover entire width of grind area with extrudate. <br />H. When restarting welding, grind ends of all welds that are more than five minutes <br />old. <br />3.10 HOT WEDGE WELDING <br />A. Do not weld on geomembrane until equipment has passed trial weld test. <br />B. Place smooth insulating plate or fabric beneath hot welding apparatus after usage. <br />C. Protect against moisture build-up between panels. <br />D. If welding cross seams, conduct trial welds at least every two hours, otherwise, once <br />prior to start of work and once at mid-day. <br />E. Bevel edges of top and bottom panels on cross seams. <br />F. Extrusion -weld a repair patch over all tee and cross -seam intersections. <br />3.11 INSTALLATION QUALITY CONTROL <br />A. Log the following every four hours: <br />1. Temperature on the geomembrane surface being welded. <br />3. Extrudate temperatures in barrel and at nozzle (extrusion welder). <br />4. Operating temperature of hot wedge (hot wedge welder) and any pressure <br />adjustments made. <br />5. Preheat temperature. <br />SHAW ENVIRONMENTAL, INC. <br />San Joaquin County — Extension of Cap Corral Hollow Sanitary Landfill — CH—Closure Cap Ext Proj jcchnical Specs -4-19-12 Rev 1.DocROv. 0, 04/05/2012 <br />LLDPE Geomembrane <br />02779-14 <br />