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4 Sieve) or air cooled blast furnace slag along or in combination with crushed stone <br />and/or crushed gravel conforming to ASTM Designation C33 -71a requirements. This <br />material shall be used primarily for pipeline and manhole foundations. <br />B. Type 2 - Type 2 material shall be unclassified material obtained from the Contractor's <br />excavations and approved by the Engineer. The material shall be substantially free <br />from wood, roots, humus, peat, muck, and other organic materials, and shall not contain <br />clods, stones, masonry rubble, and the like, greater than 6 inches through the largest <br />dimension. In general, the material shall consist of sand, loam, sandy- loam, clayey -sand, <br />gravel, or crushed stone. <br />C. Type 3 - Type 3 material shall be select granular material, free from organic matter, of <br />such size and gradation that the desired compaction can be readily attained and shall meet <br />the requirements for A3 material according to the Revised Bureau of Public Roads <br />Classifications. Material from the Contractor's excavations may be used, if it meets the <br />above requirements. Otherwise it must be imported. <br />3.06 BEDDING AND FOUNDATIONS <br />A. Ordinary Bedding <br />The bottom of the trench shall be hand shaped to provide a firm bedding for the <br />utility pipe. The utility shall be firmly bedded in undisturbed firm soil. The bedding shall <br />be shaped so that the pipe will be in continuous contact therewith for its full length and <br />shall provide a minimum bottom segment for the pipe equal to 0.6 of the outside <br />diameter of the barrel. Excavation under the bell shall be sufficient so that the bell does <br />not support the pipe and the joint can be made without interference. <br />B. Unsuitable Bedding Material <br />Class C Bedding shall be used for all pipeline construction unless otherwise shown on <br />the Drawings or unless unsuitable material is encountered at the bedding surface. In the <br />event that the materials encountered at normal bottom of trench excavation are, <br />in the judgment of the Engineer, unsuitable to act as foundation for the pipe, such <br />material shall be excavated for the full width of the trench to the depth necessary to <br />obtain a suitable foundation. The Engineer will notify the Contractor, in writing, of the <br />necessity for and extent of the material to be removed and the Contractor shall <br />remove such unsuitable material as soon as possible and backfill in accordance with the <br />requirements for Class B Bedding. All unsuitable material shall be disposed of by the <br />Contractor. <br />3.07 PIPE TRENCH BACKFILL <br />A. Initial Backfill <br />1. Initial backfill shall be placed as soon as possible after laying the pipe and shall <br />maintain a pace with the pipe laying so that no more than five pipe joints separate <br />laying and backfilling operations. Initial backfill shall include all haunching and <br />backfill from the top of the bedding to a compacted depth of twelve inches <br />over the pipe. All haunching and backfilling shall be done in the dry. <br />2. Initial backfill shall be done as specified below: <br />02530n5 <br />02530 — Gravity Sanitary Sewer Piping <br />