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2.02 SEAMING AND TESTING EQUIPMENT: <br />• A. Seaming <br />1. Approved field seaming processes are hot shoe double fusion welding and extrusion <br />welding, when approved by CERTIFYING ENGINEER. Use double fusion <br />welding as primary method of seaming adjacent field panels. <br />2. CONTRACTOR shall maintain on-site a minimum of two spare operable seaming <br />appazatuses. <br />3. Seaming equipment shall not damage the geomembrane. <br />4. CONTRACTOR may use a hot air device ("Leister") to temporarily bond <br />geomembrane panels that are to be extrusion welded. <br />5. CONTRACTOR shall use extrusion welding appazatus equipped with gauges giving <br />temperature of preheat and extrudate at nozzle of apparatus. <br />6. Welding rods or beads used for extrusion welding shall have the same physical <br />properties as that used for the resin used in the manufacture of the type of <br />geomembrane that is being installed at the Cresson Project. <br />7. CONTRACTOR shall use fusion welding apparatus which are self-propelled <br />devices equipped with a gauge indicating temperature of heating element, and a <br />gauge indicating the speed of the welding apparatus. <br />. B. Vacuum Testing (for extrusion seam only) <br />The equipment shall consist of the following: <br />1. Vacuum box assembly consisting o£ rigid housing, transpazent viewing window, soft <br />neoprene gasket attached to bottom of housing or port hole and valve assembly, and <br />vacuum gauge. <br />2. Pump assembly equipped with pressure controller and pipe connections. <br />3. Rubber pressure/vacuum hose with fittings and connections. <br />4. Bucket of soapy solution. <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 />Air pump (manual or motor driven), equipped with a pressure gauge, capable of <br />generating sustaining and measuring pressure between 25 and 30 psi and mounted <br />on a cushion to protect geomembrane. <br />2. Rubber hose with fittings and connections. <br />. 3. Sharp hollow needle, or other approved pressure feed device. <br />Section 02776 Page I 1 of 20 October 25, 2000 <br />Geomembrane Golder Associpfes Revision 8 <br />i'.1001220IW000\CERTREPoBOZWPPENUSNPPE\993-2099011161 RH DOC <br />