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4. Seal the other end of the channel. <br />5. Energize the air pump to the pressure of approximately thirty (301 psi, close <br />valve, and sustain pressure for approximately five (51 minutes. <br />6. If lass of pressure exceeds three i31 psi, or pressure does not stabilize, locate <br />faulty area, repair 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 <br />numher, date and tester will be indicated with an indelible marker on the liner <br />at each test interval location. <br />D. The following procedures shalt apply to locations where seams cannot be non- <br />destructively tested, as determined by MANAGER and CERTIFYING ENGINEER: <br />It the seam is accessible to testing equipment prior to final installation, the <br />seam shall be non-destructively tested prior to final installation. <br />2. If the seam cannot be tested prior to final insta~lation, the seaming operaticns <br />shall be observed by MANAGER and CERTIFYING ENGINEER for uniformity and <br />completeness. <br />E. In the event that seam continuity cannot be demonstra[ed for anon-destructive tesr of <br />a fusion seam as outlined above, the CONTRACTOR shall perform the non-destructive <br />testing over smaller areas as a means of defining the questionable area, and shall: <br />1. Extrusion weld the outside edge of the questionable seam area and vacuum box <br />test the extrusion weld; or, <br />2. Cap the questionable area and vacuum test the cap. <br />3.9 DESTRUCTIVE TESTING: <br />A. CONTRACTOR shall test a minimum of one destructive test sample per five hundred <br />(500) feet of seam length from a location specified by MANAGER and CERTIFYING <br />ENGINEER. CONTRACTOR shall not be informed in advance of the sample location. <br />The samples shall be taken centered over the seam and prioritized as follows: <br />7. A minimum of one sample per day; <br />2. All areas identified as suspect during seaming, non-destructive <br />testing/monitoring, and in unusual working conditions. <br />3. A minimum of one sample for each geamembrane seamer. <br />4. A minimum of one sample every five hundred (500) feet of seaming. <br />B. Samples shall ba cut by CONTRACTOR as the seaming progresses. Sampling locations <br />shall be determined by MANAGER and CERTIFYING ENGINEER MANAGER and <br />March 26, 1996 Section 02776.0 <br />02778.0-20 Geamembrane <br />Revision 4 <br />