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one to be retained in OWNER's archives and one to be retained by <br />CONTRACTOR. <br />3.08 NONDESTRUCTIVE TESTING: <br />A. <br />8. <br />C. <br />CONTAACTOR shall non-destructively test all field seams over their full length. All test <br />equipmentshall be furnished by CONTRACTOR. <br />The following vacuum box procedures are applicable to extrusion seaming and shall be <br />followed by CONTRACTOR: <br />1 . Excess sheet overlap shall be trimmed away. <br />2. Clean the vacuum box window, gasket surfaces and check for leaks. <br />3. Energize the vacuum pump and reduce the tank pressure to approximately 5 <br />psi. <br />4. Wet a strip of geomembrane the approximate dimensions of the vacuum box <br />with the soapy solution. <br />5. Place the box over the wetted area and compress. <br />6. Close the bleed valve and open the vacuum valve. <br />7. Ensure that ~ leak-tight seal is created. <br />8. For a period of not less than ten (101 seconds, examine the geomembrane <br />through the viewing window for the presence of soap bubbles. <br />9. If no bubbles appear after ten f10) seconds, close the vacuum valve and open <br />the bleed valve, move the box over the next adjoining area with a minimum <br />three (31 inches overlap and repeal the process. <br />10. All areas where soap bubbles appear shall be marked and repaired and then <br />retested. <br />11. Test locations, deeumentatian number, data and tester will be indicated with <br />an indelible marker on the geomembrane far each repair or seam section. The <br />color code for indelible markers is to be determined at the pre-construction <br />meetings, and suictiy adhered to. <br />The following nondestructive test procedures are applicable to fusion seaming and shall <br />be followed by CONTRACTOR. <br />1. Seal one end of the seam to be tested. <br />2. Insert needle or other approved pressure feed device through the sealed end of <br />the channel created by the double wedge fusion weld. <br />3. Energize the air pump to verity the unobstructed passage of air through the <br />channel. <br />March 28, 1996 Section 02776.0 <br />02776.0-19 Geomembrane <br />Revision 4 <br />