Laserfiche WebLink
I <br /> I <br /> I 4. For pipes or conduit 6 in. or larger, tanks and other work indicated to <br /> receive subbase, excavate to subbase depth indicated, or, if not <br /> otherwise indicated, to 6 in. below bottom of work to be supported. <br /> 1 5. Except as otherwise indicated, excavate for exterior water-bearing piping <br /> so top of piping is minimum 30" below finished grade. <br /> I 6. Grade bottoms of trenches as indicated, notching under pipe bells to <br /> provide solid bearing for entire body of pipe. <br /> I N. Do not backfill trenches until tests and inspections have been made and <br /> backfilling authorized by Engineer. <br /> I3.04 PIPE INTERFERENCES <br /> A. The contractor shall abide by the following schedule of criteria concerning <br /> 1 interferences with other utilities. <br /> 1. In no case shall there be less than 0.3 feet between any two pipelines <br /> Iand structures. <br /> 2. Class I Concrete Encasement: Wherever there is more than 0.3 foot, but <br /> 1 not less than 1.5 foot clearance between water mains or water services, <br /> then a concrete encasement shall be provided in accordance with the <br /> typical detail as shown on the Drawings. <br /> 1 3. Class II Concrete Encasement: Wherever there is more than 0.3 foot, <br /> but less than 1.0 foot clearance between any two pipe lines, or between <br /> I pipe lines and structures, then a concrete encasement shall be provided <br /> in accordance with the typical detail as shown on the Drawings. <br /> B. The Engineer shall have full authority to direct the placement of the various pipes <br /> and structures in order to facilitate construction, expedite completion and to <br /> avoid conflicts. <br /> I3.05 BACKFILLING <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 suitable compacted material <br /> to the mid-diameter of the pipe. <br /> B. All backfilling shall be prosecuted expeditiously as work permits, but not until <br /> completion of the following: <br /> I 1. Acceptance of construction below finish grade including waterproofing <br /> and perimeter insulation. <br /> I 2. Inspection, testing, approval, and recording locations of underground <br /> utilities. <br /> I05/08 02221-8 05-4893 <br />