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• <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 psi. <br />4. Wet a strip of geomembrane the approximate dimensions of the vacuum box with the <br />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 a leak -tight seal is created. <br />8. For a period of not less than ten (10) seconds, examine the geomembrane through the <br />viewing window for the presence of soap bubbles. <br />9. If no bubbles appear after ten (10) seconds, close the vacuum valve and open the bleed <br />valve, move the box over the next adjoining area with a minimum three (3) inches overlap <br />and repeat the process. <br />10. All areas where soap bubbles appear shall be marked and repaired and then retested. <br />11. Test locations, documentation number, date and tester will be indicated with an indelible <br />marker on the geomembrane for each repair or seam section. The color code for indelible <br />markers is to be determined at the pre - construction meetings, and strictly adhered to. <br />C. The following nondestructive test procedures are applicable to fusion seaming and shall be <br />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 the <br />channel created by the double wedge fusion weld. <br />3. Energize the air pump to verify the unobstructed passage of air through the channel. <br />4. Seal the other end of the channel. <br />5. Energize the air pump to the pressure of approximately 30 psi, close valve, and sustain <br />pressure for approximately 5 minutes. <br />6. If loss of pressure exceeds 3 psi, or pressure does not stabilize, locate faulty area, repair, <br />and retest. <br />7. Remove needle or other approved pressure feed device. <br />8. Repair pressure test locations as described in Section 3.11. <br />9. Beginning and ending pressures and times, test locations, documentation number, date, <br />and tester will be indicated with an indelible marker on the liner at each test interval <br />location. <br />Section 02776 <br />Geomembrane <br />SAPro1ects \1125E CCV CQA \I - Tech Specs \02776.0.doc <br />Page 18 of 22 <br />September 3, 2008 <br />Revision 1 <br />