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<br />Ensure that a leak tight seal is created: <br />For a period of approximately ~ to 10 seconds, examine the geomembrane <br />through the viewing window for the presence of soap bubbles; <br />If no bubble appeazs after 10 to 1 ~ seconds, close the vacuum valve and <br />open the bleed valve, move the box over the next adjoining azea with a <br />minimum 3 inches (7~ mm) overlap, and repeat the process; <br />All areas where soap bubbles appear shall be marked and repaired in <br />accordance with Section 3.4; <br />Vacuum tested seams are recorded on Daily Progress Reports (Figure 6). <br />3.3.7.3 <br />PRESSURE TEST SPECIFICATIONS FOR DUAL TRACK HOT WEDGE <br />WELDS <br />Test Pressure (.-after ~ min.) PSI Iv1ax. Pressure <br />Sheet thickness iVlin. ~i laz. Drop Allowed <br />30 mil 24 30 3 PSI <br />40 mil 24 30 3 PSI <br />60 mil 27 30 3 PSI <br />80 mil 27 30 3 PSI <br />100 mil & thicker 32 30 3 PSI <br />3.3.7.4 Air Pressure Testing (For Double Fusion Seam Only) <br />The equipment shall be comprised of the following: <br />An air pump (manual or motor driven) equipped with pressure gauge <br />capable of generating and sustaining a pressure between 2~ and 30 psi <br />(160 and 200 kPa); <br />A rubber hose with fittings and connections; and <br />A sharp hollow needle, or other approved pressure feed device. <br />The following procedures shall be followed: <br />Seal both ends of the seam to be tested; <br />21 <br />