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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 <br />Initial Lift Thickness <br />(ft) <br />(psi) <br />< 5 <br />0.5 <br />5 <br />1.0 <br />10 <br />1.5 <br />20 <br />2.0 <br />>20 <br />>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 -06 <br />02300 22 EARTHWORK <br />• <br />• <br />