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<br /> <br />Verification of the adequacy of all seams and repairs including associated testing is <br />complete. <br />3.7 Soils in Contact with the Geomembrane <br />Important points for quality assurance of soils in contact with geomembranes include: <br />A geotextile or other cushion approved by the designer may be installed between <br />angular aggregate and the geomembrane; <br />Equipment used for placing soil shall not be driven directly on the geomembrane; <br />A minimum thickness of 1 foot (0.3 m) of soil is recommended between a light <br />dozer (such as a CAT D-3 or wide track caterpillar D-6 or lighter) and the <br />geomembrane. <br />In heavily trafficked azeas such as access ramps, soil thickness should be at least 2 <br />to 3 feet (0.6 - 0.9 m). <br />Soil/Earth Cover on top of Geomembrane <br />Placement of soils, sand or other types of earth cover on top of the liner shall not be <br />performed until all destructive and non-destructive testing has been performed and <br />accepted. <br />Placement should be performed to minimize wrinkles. Equipment operators should be <br />briefed on method of placement and affects to thermal expansion and contraction of the <br />liner. <br />ivlaterial placed on top of the liner should be back-dumped on liner, and in order to avoid <br />the formation of wrinkles, efforts should be made to load the soil so that it comes down <br />on top of the liner rather than being pushed across the sheet. This is done by 1) using a <br />front end loader to place soil ahead of spreading soil cover, and 2) spreading soil by <br />building a mound at the edge of soil, then pushing soil up and over the mound causing it <br />to come down on the liner. <br />If a wrinkle forms, every effort should be made to walk the wrinkle out. <br />Ivlinor folding over of wrinkles is acceptable providing an even transition occurs at the <br />tail of the wrinkle. If excessive stress points aze created at the tail of [he wrinkle, the <br />wrinkle should be cut out and repaired per Section 3.4. <br />GEOTEXTILE AND GEONET <br />zs <br />