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L 4 Sieve) or air cooled blast furnace slag along or in combination with crushed stone and/or crushed gravel conforming to ASTM Designation C33 -71a requirements. This material shall be used primarily for pipeline and manhole foundations. B . Type 2 - Type 2 material shall be unclassified material obtained from the Contractor's L excavations and approved by the Engineer. The material shall be substantially free from wood, roots, humus, peat, muck, and other organic materials, and shall not contain clods, stones, masonry rubble, and the like, greater than 6 inches through the largest dimension. In general, the material shall consist of sand, loam, sandy- loam, clayey-sand, gravel, or crushed stone. C. Tyne 3 - Type 3 material shall be select granular material, free from organic matter, of such size and gradation that the desired compaction can be readily attained and shall meet the requirements for A3 material according to the Revised Bureau of Public Roads Classifications. Material from the Contractor's excavations may be used, if it meets the above requirements. Otherwise it must be imported. 3 .06 BEDDING AND FOUNDATIONS A . Ordinary Bedding The bottom of the trench shall be hand shaped to provide a firm bedding for the utility pipe. The utility shall be firmly bedded in undisturbed firm soil. The bedding shall j be shaped so that the pipe will be in continuous contact therewith for its full length and shall provide a minimum bottom segment for the pipe equal to 0. 6 of the outside diameter of the barrel. Excavation under the bell shall be sufficient so that the bell does not support the pipe and the joint can be made without interference. B . Unsuitable Bedding Material Class C Bedding shall be used for all pipeline construction unless otherwise shown on the Drawings or unless unsuitable material is encountered at the bedding surface . In the event that the materials encountered at normal bottom of trench excavation are, in the judgment of the Engineer, unsuitable to act as foundation for the pipe, such material shall be excavated for the full width of the trench to the depth necessary to obtain a suitable foundation. The Engineer will notify the Contractor, in writing, of the necessity for and extent of the material to be removed and the Contractor shall remove such unsuitable material as soon as possible and backfill in accordance with the requirements for Class B Bedding. All unsuitable material shall be disposed of by the Contractor. 3 . 07 PIPE TRENCH BACKFILL A . Initial Backfill r 1 . Initial backfill shall be placed as soon as possible after laying the pipe and shall maintain a pace with the pipe laying so that no more than five pipe joints separate laying and backfilling operations. Initial backfill shall include all haunching and backfill from the top of the bedding to a compacted depth of twelve inches over the pipe. All haunching and backfilling shall be done in the dry. 2. Initial backfill shall be done as specified below: ir. 02530 — Gravity Sanitary Sewer Piping 02530- 5 Yr.