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3.04 FILLING OPERATIONS <br /> A. General <br /> The Contractor shall be responsible for the maintenance and protection of all excavations and <br /> fills made during the contract period and shall bear the expense of replacing any portion which <br /> has been displaced due to carelessness, negligent work, erosion or failure to take proper <br /> precautions. <br /> If the existing slope in an area to be filled is greater than 5:1, the Contractor shall bench the <br /> area prior to filling to allow each lift to be keyed 1 ft into the existing slope. <br /> B. Construction of Engineered Fill <br /> After clearing operations are complete as specified herein, subgrade shall be scarified to a depth <br /> of 12 inches, moisture conditioned and recompacted as specified for fill. All engineered fill <br /> material shall be placed in layers of 12 inches or less in loose thickness, except areas under <br /> structures such as the support building engineered fill material shall be placed in layers of 6 <br /> inches or less in loose thickness. Compaction shall be 90 percent of ASTM D1557 maximum <br /> dry density up to 3 feet unless otherwise noted on the Drawings below the thickness of the new <br /> asphalt concrete, and shall be compacted to 95 percent maximum dry density within the 3-foot, <br /> unless otherwise shown on the Drawings, area below the new pavement or shoulder. All <br /> engineered fill material under structures shall be compacted to 95 percent of ASTM D1557 <br /> maximum dry density. Compaction of materials by ponding and jetting is prohibited. <br /> No fill shall be placed during weather conditions which will alter the moisture content of the fill <br /> materials sufficiently to make adequate compaction impossible. After placing operations have <br /> been stopped because of adverse weather conditions, no additional fill material shall be placed <br /> until the last layer compacted has been checked and found to be compacted to the specified <br /> densities. <br /> C. Structure Backfill and Foundation Materials <br /> Unless otherwise specified, structure backfill shall be constructed as specified for engineered fill <br /> in this section. After completion of construction below the elevation of the final grade, and prior <br /> to backfilling, forms shall be removed and the excavation shall be cleaned of debris. <br /> Do not backfill against walls until concrete has obtained the specified 28-day compressive <br /> strength. <br /> D. Pipe Bedding and Trench Backfill <br /> Bedding: Provide six-inch minimum bedding material under pipe. Bedding shall be placed in <br /> 6-inch maximum loose lifts. Crushed rock shall be vibratory to a non-yielding compaction. All <br /> other backfill within pipe bedding zone shall be compacted to 90 percent relative compaction. <br /> Provide uniform and continuous support for each section of utility except at bell holes or <br /> depressions necessary for making proper joints. Bring up evenly on each side and along the full <br /> length of the pipe. Ensure that no damage is done to piping or their protective coatings. <br /> Backfilling: Backfill shall be placed in 6-inch maximum loose lifts. Fill and manually compact <br /> under springline of pipeline prior to placement of next lift of backfill. Compaction shall be 90 <br /> July 2007 Division III-60 NEI Phase II Water and Sewer <br /> CIP Nos. 7468, 7589, 7590 <br />