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<br /> <br />The fusion-welding apparatus must be an automated vehiculaz mounted device which <br />produces a double seam with an enclosed space or solid seam on thin mil material as <br />specified. <br />The fusion welding appazatus shall be equipped with gauges giving the applicable <br />temperatures. <br />ILP[ shall verify that: <br />Equipment used for seaming is not likely to damage geomembrane; <br />The extrusion welder is purged prior to beginning a seam until all heat-degraded <br />extrudate has been removed from the barrel. <br />The electric generator is placed on a smooth base such that no damage occurs to <br />the geomembrane; <br />Buffing shall be completed no more than one (I) hour prior to extrusion welding <br />(buffing is not necessary for hot wedge welding): <br />A smooth insulating plate or fabric is placed beneath the hot welding appazatus <br />after usage; and <br />The seomembrane is protected from damage in heavily trafficked areas. <br />3.3.3 Seam Preparation <br />ILPI shall verify that: <br />Prior to seaming, the seam azea is clean and free of moisture, dust, dirt, debris of <br />any kind, and foreign material; <br />Seams aze aligned with the fewest possible number of wrinkles and "tishmouths" <br />3.3.4 Weather Conditions for Seaming <br />The normally required weather conditions for seaming aze as follows: <br />The high temperature limit for welding is the temperature at which the well-being <br />of the crew becomes uncertain. <br />Unless authorized in writing by the Project manager, no seaming shall be <br />attempted at ambient temperatures below 5 degrees Fahrenheit. <br />17 <br />