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4. Contractor may use a hot air device ( "Leister ") to temporarily bond <br />geosynthetic panels that are to be extrusion welded. <br />5. Contractor shall use extrusion welding apparatus equipped with <br />gauges giving temperature of preheat and extrudate at nozzle of <br />apparatus. <br />6. Contractor shall use fusion welding apparatus which are self - <br />propelled devices equipped with a gauge indicating temperature of <br />heating element, and a gauge indicating the speed of the welding <br />apparatus. <br />B. Vacuum Testing (for extrusion seam only) <br />The equipment shall consist of the following: <br />1. Vacuum box assembly consisting of: rigid housing, transparent <br />viewing window, soft neoprene gasket attached to bottom of <br />housing or port hole and valve assembly, and vacuum gauge; <br />2. Pump assembly equipped with pressure controller and pipe <br />connections; <br />3. Rubber pressure /vacuum hose with fittings and connections; <br />4. Bucket of soapy solution; and <br />5. Wide paint brush, or other means of applying soapy solution. <br />C. Air Pressure Testing (for double fusion seam only) <br />The equipment shall consist of the following: <br />1. Air pump (manual or motor driven), equipped with a pressure <br />gauge, capable of generating, sustaining, and measuring pressure <br />between 25 to 35 psi and mounted on a cushion to protect <br />geosynthetic; <br />2. Rubber hose with fittings and connections; <br />3. Sharp hollow needle, or other approved pressure feed device; and <br />4. An air pressure monitoring device with an accuracy of 1 psi. <br />PART 3 EXECUTION <br />3.1 PRE - INSTALLATION <br />Rio Grande Silver Tailings Evaporation Pond 02620 -10 Geosynthetic Liner <br />August2011 02620 <br />