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I B. Rock shall be removed to a minimum 8- inches clearance around the bottom and sides of all the pipe or ducts being laid. ' C. Where pipe is to be laid in limerock bedding or encased in concrete, the trench may be excavated by machinery to or just below the I designated subgrade provided that the material remaining in the bottom of the trench remains undisturbed. D. Where the pipes or ducts are to be laid directly on the trench bottom the lower part of the trenches shall not be excavated to the trench bottom by machinery. The last of the material being excavated shall ' be done manually in such a manner that will give a flat bottom true to grade so that pipe can evenly and uniformly supported along its entire ' length on undisturbed material or bedding rock. Bell holes shall be made as required manually so that there is no bearing surface on the bells and pipes are supported along the barrel only. ' E. The bottom of the excavations shall be firm and dry and in all respects acceptable to the Engineer. Excavate any organic soil material from the bottom of the trench and replace with rock bedding, at least 6 inches thick. 3.03 PIPE INTERFERENCES AND ENCASEMENT A. The contractor shall abide by the following schedule of criteria concerning ' interferences with other utilities. 1. In no case shall there be less than 0.3 feet between any two pipe lines and structures. 2. Class I Concrete Encasement: Wherever there is more than 0.3 foot, but not less than 1.5 foot clearance between water mains or water services, then a concrete encasement shall be provided in accordance with the typical detail as shown on the Drawings. 3. Class II Concrete Encasement: Wherever there is more than 0.3 foot, but less than 1.0 foot clearance between any two pipe ' lines, or between pipe lines and structures, then a concrete encasement shall be provided in accordance with the typical detail as shown on the Drawings. B. The Engineer shall have full authority to direct the placement of the various pipes and structures in order to facilitate construction, iexpedite completion and to avoid conflicts. 3.04 BACKFILLING 1 07/03 02221 -5 03- 4138.A