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1 <br />- Vacuum gauge. <br />A vacuum pump capable of delivering a minimum of 27 psi of vacuum shall be used. <br />~~ , When vacuum testing, the Contractor shall: <br />- Clean windows, gasket surfaces, and check for leaks; <br />- Wet a strip of geomembrane approximately 12 inches by 30 inches (length of box) with <br />' soapy solution; <br />- Place the vacuum box over the wetted area; <br />- Ensure that aleak-tight seal is created; <br />- For a period of not less than 15 seconds, examine the length of weld through the viewing <br />window for the presence of soap bubbles; <br />1 <br />' - If no bubbles appeaz after 15 seconds, move the box over the next adjoining azea with <br />a minimum three inches of overlap and repeat the process; <br />' - Areas where soap bubbles appear shall be mazked, repaired, and retested; and <br />' - All vacuum testing will be documented by the QC Technician and submitted to the <br />Engineer at the end of each work shift. <br />At locations where seams cannot be non-destructively tested, the Contractor shall: <br />' - Cap-strip seams with same geomembrane when possible; <br />- [f the seam is accessible to testing equipment prior to final installation, non+-destructively <br />test the seam prior to final installation; and <br />- Seaming and cap-stripping operations will be observed by Quality Assurance Engineer <br />for uniformity and completeness. <br />For double hot wedge seams, air pressure testing may be conducted. The equipment is <br />comprised of the following: <br />' -za <br />I <br />