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3.6 STOCKPILE ACTIVITIES ® A. Stockpile all excavated material. Uniformly grade stockpile area to conform to existing contours, leave with a neat appearance, and maintain current drainage patterns. The stockpile shall have a slope no greater than two horizontal to one vertical and the top surface shall have a minimum 5 percent grade. B. Selective Stockpiling: 1. The CONTRACTOR shall make all reasonable efforts to separately stockpile fine grained materials suitable for use as the Clay Liner and Clay Earthfill. Material suitable for use as protective operations layer shall be placed in separate stockpile. 2. The QA/QC CONSULTANT may sample and analyze all stockpiles created by the EARTHWORK CONTRACTOR. 3. If, in the opinion of the QA/QC CONSULTANT, the EARTHWORK CONTRACTOR is not adequately separating excavated soil in accordance with these Specifications, the QA/QC CONSULTANT may direct the EARTHWORK CONTRACTOR to modify his stockpiling operation or may order the EARTHWORK CONTRACTOR to halt excavation and stockpiling activities until adequate procedures can be developed. 4. Delays caused by inadequate stockpiling operation, as determined by the QA/QC CONSULTANT, shall not be cause for an extension in the EARTHWORK CONTRACTOR's completion dates or cause for ® EARTHWORK CONTRACTOR change orders and all additional cost associated shall be at the EARTHWORK CONTRACTOR's sole expense. 3.7 GRADING AND SUBGRADE PREPARATION A. This Work shall consist of fine grading and preparation of lining subgrade for the construction of the base lining. The lining subgrade is further defined as those areas and surfaces within the subgrade upon which lining materials are to be placed. 1. Fine grading shall be performed to grade the subgrade to within the tolerances specified in Section 01410, SURVEYS. 2. The prepared subgrade surface shall be smooth and free of major irregularities. The subgrade should contain no exposed particles larger than 3 inches or other surface irregularities which, in the opinion of the QA/QC CONSULTANT, will damage the 60-mil HDPE geomembrane. 3. Overexcavation below the established lining subgrade by the EARTHWORK CONTRACTOR shall, at his expense, be backfilled with Clay Liner Material or General Earthfill Material as directed by the QA/QC CONSULTANT. 4. Once completed, all traffic shall be kept off the lining subgrade. 5. The lining subgrade shall be maintained in the finished condition until the first succeeding course is placed. Any damage to the prepared lining subgrade by the EARTHWORK CONTRACTOR shall be repaired, at the EARTHWORK CONTRACTOR's expense. Any damage to the prepared lining subgrade by the GEOSYNTHETICS CONTRACTOR, including those caused by a delay Forward Landfill WMU FU-14 02300 12 EARTHWORK