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F . Bedding and Foundations <br /> ' 1 ) Ordinary Bedding <br /> ' a. The bottom of the trench shall be hand shaped to provide a firm <br /> bedding for the utility pipe . The utility shall be firmly bedded in <br /> undisturbed firm soil . The bedding shall be shaped so that the pipe <br /> ' will be in continuous contact therewith for its full length and shall <br /> provide a minimum bottom segment for the pipe equal to 0 . 6 of <br /> the outside diameter of the barrel . Excavation under the bell shall be <br /> ' sufficient so that the bell does not support the pipe and the joint <br /> can be made without interference. <br /> ' 2) Unsuitable Bedding Material <br /> a. Class C Bedding shall be used for all pipeline construction <br /> ' unless otherwise shown on the Drawings or unless unsuitable <br /> material is encountered at the bedding surface . In the event that the <br /> materials encountered at normal bottom of trench excavation <br /> are, in the judgment of the Engineer, unsuitable to act as foundation <br /> for the pipe, such material shall be excavated for the full width of the <br /> trench to the depth necessary to obtain a suitable foundation. The <br /> ' Engineer will notify the Contractor, in writing, of the necessity for <br /> and extent of the material to be removed and the Contractor <br /> shall remove such unsuitable material as soon as possible and <br /> ' backfill in accordance with the requirements for Class B Bedding . <br /> All unsuitable material shall be disposed of by the Contractor. <br /> G. Pipe Trench Backfill <br /> 1 ) Initial Backfill <br /> ' a. Initial backfill shall belaced as soon as <br /> p possible after laying the <br /> ' pipe and shall maintain a pace with the pipe laying so that no more <br /> than five pipe joints separate laying and backfilling operations . <br /> Initial backfill shall include all haunching and backfill from the <br /> top of the bedding to a compacted depth of twelve inches over <br /> the pipe . All haunching and backfilling shall be done in the dry . <br /> ' b . Initial backfill shall be done as specified below: <br /> b4 . Haunching of the pipe shall be by hand placement and compaction <br /> of material in maximum 4 inch layers from the bottom of the trench <br /> to the springline of the pipe, taking care to fill all voids below <br /> and around the pipe . Backfilling shall be carefully continued in <br /> layers not exceeding 6 inches in thickness for the full trench width <br /> until the compacted fill is 12 inches above the top of the pipe . <br /> ' CADown1oad\techspec-0260Ldoc SC601 -6 <br />