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earthwork and geosynthetic materials at his sole expense. All Work <br /> performed to repair and replace materials shall be performed in accordance <br /> with the applicable Specifications sections. <br /> B. Granular Drainage Material Placement: <br /> 1. The geomembrane lining underlying the GDM layer shall be inspected and <br /> approved by the QA/QC CONSULTANT prior to placement of the GDM. <br /> 2. GDM shall be placed in a single continuous and approximately horizontal <br /> lift unless otherwise specified or specifically permitted by the QA/QC <br /> CONSULTANT. <br /> 3. Method of dumping and spreading materials shall ensure uniform <br /> distribution of the material and prevent damage to the underlying <br /> geomembrane lining. <br /> 4. Layer thickness shall be as shown on the Construction Drawings. Do not <br /> operate placement equipment over the geomembrane lining with less than <br /> 12 inches of granular drainage materials in place. <br /> 5. The EARTHWORK CONTRACTOR shall use low ground pressure <br /> equipment to place the granular drainage material. A minimum thickness of <br /> 1 ft of material is required between a low ground pressure dozer (such as a <br /> wide pad Caterpillar D-4 bulldozer or equivalent) and an underlying <br /> geomembrane. A minimum thickness of 3 ft of material is required between <br /> rubber-tired vehicles and underlying geosynthetics. In areas of heavy <br /> vehicle traffic, such as access ramps, the material thickness should be at <br /> least 3 ft. In any case, the following table shall be complied with during <br /> construction: <br /> Maximum <br /> Equipment Ground Pressure Initial Lift Thickness <br /> (psi) (ft) <br /> <5 0.5 <br /> 5 1.0 <br /> 10 1.5 <br /> 20 2.0 <br /> >20 >3.0 <br /> 6. EARTHWORK CONTRACTOR is responsible for repairing any <br /> geomembrane lining material damaged during GDM placement at no cost to <br /> the OWNER. <br /> 7. After completion of the GDM layer, construction traffic shall be minimized <br /> to that absolutely necessary for placement of the overlying geotextile and <br /> Protective Operations Layer. No vehicles used for transporting the GDM or <br /> coarse gravel from the borrow source shall be allowed on top of the placed <br /> and compacted GDM layer except in areas where a minimum 12-inches of <br /> protective operations layer and geotextile have been placed above the GDM. <br /> Forward Landfill WMU FU-14 <br /> 02300 21 EARTHWORK <br />