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Colorado Legacy Land Former Schwartzwalder Mine <br /> North Waste Rock Pile Diversion Channel <br /> (2) Insert pressure feed needle into the air channel at one end and <br /> pressurize to 30 psi. <br /> (3) Allow conditions to stabilize for 2 minutes. <br /> (4) Note starting pressure. <br /> (5) Note pressure after 5 minutes. <br /> (6) Ensure pressure loss does not exceed 2 psi. <br /> (7) If pressure cannot be generated or if pressure loss is excessive <br /> walk the length of the seam listening for the whistling noise at a <br /> leak. If a leak is found repair and re-test. <br /> (8) If pressure loss is acceptable release seal at far end of seam and <br /> confirm loss of pressure. <br /> (9) If pressure is not lost locate blockage in the channel and test the <br /> untested section. <br /> (10) Repair needle hole with one extrusion bead. <br /> (11) Write on the liner the tester's initials, date, start time/pressure, <br /> finish time/pressure,pressure drop,pass/fail. <br /> C. Vacuum Box Testing <br /> (1) Apply soapy solution to seam area to be tested. <br /> (2) Place vacuum box with clean viewing glass along seam. <br /> (3) Ensure sealing foam around bottom of box is well seated and <br /> provides a good seal. <br /> (4) It may be necessary to"work"the box into place and to use <br /> some wet rags to get a good seal. <br /> (5) Reduce pressure difference in the box to about 4 psi. <br /> (6) Monitor the seam for soap bubbles for at least 5 seconds. <br /> (7) Mark any locations where bubbles indicate leaks for repairs. <br /> (8) If no bubbles occur after 5 seconds relieve vacuum and move to <br /> next seam section. <br /> (9) Overlap sections tested by about 3 in. and re-test. <br /> (10) Write on the liner the tester's initials,date,time tested,test <br /> pressure, and"VB pass/fail". <br /> Section 026617-Geomembrane Page 10 <br />