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F. Where pipe is to be laid in limerock bedding or encased in concrete, the trench <br />may be excavated by machinery to or just below the designated subgrade <br />provided that the material remaining in the bottom of the trench remains <br />undisturbed. <br /> <br />G. Where the pipes or ducts are to be laid directly on the trench bottom the lower <br />part of the trenches shall not be excavated to the trench bottom by machinery. <br /> <br />H. The last of the material being excavated shall be done manually in such a <br />manner that will give a flat bottom true to grade so that pipe can evenly and <br />uniformly supported along its entire length on undisturbed material or bedding <br />rock. <br /> <br />I. Bell holes shall be made as required manually so that there is no bearing <br />surface on the bells and pipes are supported along the barred only. <br /> <br />J. The bottom of the excavations shall be firm and dry and acceptable to the <br />ENGINEER. <br /> <br />K. Excavate organic soil material from the bottom of the trench and replace with <br />rock bedding, at least 6 inches thick. <br /> <br />3.03 PIPE INTERFERENCES AND ENCASEMENT <br /> <br />A. Abide by the following schedule of criteria concerning interferences with other <br />utilities. <br /> <br />1. In no case shall there be less than 0.3-feet between two pipe lines and <br />structures. <br /> <br />2. Class I Concrete Encasement: Wherever there is clearance between water <br />mains or water services, then a concrete encasement shall be provided in <br />accordance with the typical detail as shown in the Drawings. <br /> <br />3. Class II Concrete Encasement: Wherever there is more than 0.3 foot, but <br />less than 1.0 foot clearance between two pipe lines, or between pipe lines <br />and structures, then a concrete encasement shall be provided in accordance <br />with the typical detail as shown in the Drawings. <br /> <br />B. The ENGINEER shall have full authority to direct the placement of the various <br />pipes and structures in order to facilitate construction, expedite completion and <br />to avoid conflicts. <br /> <br />3.04 BACKFILLING <br /> <br />A. Backfilling over pipes shall begin as soon as practical after the pipe has been <br />laid, jointed, and inspected and the trench filled with bedding material to the <br />mid-diameter of the pipe. <br />City of Sunny Isles Beach <br />NE 174th Street Roadway Improvements <br />02315 - <br />6 <br />Excavation and Fill <br />14-1758 / 09-19-2014 <br />