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a Verify equipment used on the geomembrane does not leak hydrocarbons onto the geomembrane and that corrective measures are taken to prevent leakage. a Verify the surface beneath the 'geomembrane has not deteriorated since previous acceptance. a Verify no stones, construction debris, or other items are beneath the geomembrane that could damage the geomembrane. a Verify the geomembrane is not dragged across a potentially damaging surface. If the geomembrane is dragged across a surface that could damage the geomembrane, the geomembrane is inspected for scratches and repaired or rejected, if necessary. a Verify the geomembrane is not placed when the air temperature is less than 40°F, or when standing water or frost is on the soil liner. a Verify crews working on the geomembrane do not smoke, wear shoes that could damage the liner,or engage in activities that could damage the geomembrane. a Verify methods used to deploy the geomembrane minimize wrinkles and that panels are anchored to prevent movement by the wind. a Verify installer corrects any damaged geomembrane resulting from movement by wind. a Verify no more panels are deployed than can be seamed on the same day. a Verify that seams of penetrations through the geomembrane such as the neutron probe access tubes are tested using spark testing(Section 5.1.9)if vacuum testing is not possible. The CQA monitor must inform both the installer and the CQA Manager if any of the above conditions are not met. ' 5.2.7 Trial!Welds Before the start of geomembrane welding and during welding operations, each welder and welding apparatus must be tested in accordance with the technical specifications to verify that it is functioning properly. One trial weld must be taken before the start of work and one at mid-shift. The trial weld sample must be at least two (2) feet long and 12 inches wide, with the seam centered lengthwise. The CQA monitor must observe all trial welding operations and verify that the installer quantitatively tests each trial weld for peel adhesion and bonded seam strength(ASTM D4437). (Peel adhesion tests will be referred to as "peel" and bonded seam strength tests will be referred to as "shear" in this manual.) The purpose of peel and shear tests is to evaluate seam strength and to evaluate long-term performance. Shear strength measures the continuity of tensile strength through the seam and into the parent material. Peel adhesion measures the strength of the bond created by the welding process. CH CQA Plan 041712 Rev2a.doc 5-6 Construction Quality Assurance Plan