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ameO <br /> done during any precipitation, in the presence of excessive moisture(e.g., fog,rain,dew)or in the <br /> presence of excessive winds,as determined by the CQA Monitor. <br /> F. Following the installation of the geomembrane, an examination of the entire surface shall be <br /> conducted to detect potentially harmful rocks or other objects. Any such objects will be removed <br /> and the geomembrane repaired by the CONTRACTOR,at no cost to CC&V. <br /> 3.06 FACTORY SEAMS <br /> MANAGER and CERTIFYING ENGINEER may require CONTRACTOR to test up to as much as <br /> twenty percent (20%) of factory fusion welds (non-destructive air pressure test) in the field to verify <br /> factory test results. Additional testing at CONTRACTOR's expense will be required if failed tests are <br /> obtained in the field. <br /> 3.07 FIELD SEAMS <br /> A. Seam Layout <br /> 1. Seams shall be oriented parallel to the line of maximum slope, i.e., oriented down, not <br /> across the slope. In corners and odd-shaped geometric locations, the number of field <br /> seams shall be minimized. <br /> 2. No horizontal or base T-seam or tie-in seams shall be closer than five (5) feet from the <br /> toe of the slope. Seams shall be aligned to prevent wrinkles and "fish mouths." If a fish <br /> mouth or wrinkle is found, it shall be relieved and capped. <br /> 3. Panels of geomembrane will have sufficient overlap provided to allow peel tests to be <br /> performed on the seam. <br /> B. Seaming Method <br /> 1. The procedure used to temporarily bond adjacent panels together shall not damage the <br /> geomembrane; in particular, the temperature of hot air at the nozzle of any spot welding <br /> apparatus shall be controlled such that the geomembrane is not damaged. <br /> 2. CONTRACTOR shall use double fusion welding as primary method of seaming <br /> adjacent field panels. <br /> a. For cross seam tees associated with fusion welding, CONTRACTOR shall <br /> patch panel intersections consisting of three or more panels and extrusion weld <br /> to a minimum distance of 4 inches on each side of patch. The edge of the sheet <br /> shall be ground to a 45'angle prior to welding. <br /> b. Place a protective layer, e.g., insulting plate or fabric, beneath hot welding <br /> apparatus after usage. <br /> C. When subgrade conditions dictate, use a moveable protective layer directly <br /> below each overlap of geomembrane that is to be seamed to prevent buildup of <br /> moisture between sheets and prevent debris from collecting around pressure <br /> rollers. <br /> d. Remove seaming sheets and excess geomembrane trimmed to provide required <br /> overlap. <br /> Section 02776 Page 15 of 22 May 9,2012 <br /> Geomembrane Revision 1 <br />