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3.7 SUBGRADE FILL <br /> A. Place Subgrade Fill at locations shown on the Construction Drawings or as <br /> directed by the QA/QC Consultant. Place material in lifts not exceeding 8-inch <br /> uniform thickness. Each lift shall be compacted to a relative compaction of not <br /> less than 90 percent (ASTM D1557). <br /> B. During all compacting operations, maintain optimum practicable moisture content <br /> required for compaction purposes in each lift of fill. Maintain uniform moisture <br /> content throughout the lift. At the time of compaction, the water content of the <br /> material shall be within 4 percent of the optimum moisture content. <br /> C. Do not attempt to compact fill material that contains excessive moisture. Aerate <br /> material by blading, discing, harrowing, or other methods to hasten the drying <br /> process. <br /> 3.8 GRADING AND SUBGRADE PREPARATION <br /> A. This Work shall consist of fine grading and preparation of lining subgrade for the <br /> construction of the base and side slope lining. The lining subgrade is further <br /> defined as those areas and surfaces within the subgrade upon which lining <br /> materials are to be placed. <br /> I. Fine grading shall be performed to grade the subgrade to within the <br /> tolerances specified in Section 01410, SURVEYS. <br /> 2. The prepared subgrade surface shall be smooth and free of major <br /> irregularities. The subgrade should contain no exposed particles larger than <br /> I inch or other surface irregularities which, in the opinion of the QA/QC <br /> CONSULTANT, will damage the overlying GCL and 60-mil HDPE <br /> geomembrane. <br /> 3. Overexcavation below the established lining subgrade by the <br /> EARTHWORK CONTRACTOR shall, at his expense, be backfilled with <br /> Clay Liner Material or General Earthfill Material as directed by the QA/QC <br /> CONSULTANT. <br /> 4. All traffic shall be kept off the lining subgrade. <br /> 5. The lining subgrade shall be maintained in the finished condition until the <br /> first succeeding course is placed. Any damage to the prepared lining <br /> subgrade by the EARTHWORK CONTRACTOR shall be repaired, at the <br /> EARTHWORK CONTRACTOR's expense. Any damage to the prepared <br /> lining subgrade by the GEOSYNTHETICS CONTRACTOR, including <br /> those caused by a delay of the GEOSYNHETICS CONTRACTOR, shall be <br /> at the GEOSYNTHETICS CONTRACTOR's expense. <br /> FORWARD LANDFILL 02300 <br /> 12 EARTHWORK <br />