Specifications - Laserfiche WebLink

Home Browse Search

' Hand excavate bottom cut to accurate elevations and support pipe or conduit on undisturbed soil. ' 4. For pipes or conduit 6 in. or larger, tanks and other work indicated to receive subbase, excavate to subbase depth indicated, or, if not ' otherwise indicated, to 6 in. below bottom of work to be supported. 5. Except as otherwise indicated, excavate for exterior water - bearing piping so top of piping is minimum 30" below finished grade. 6. Grade bottoms of trenches as indicated, notching under pipe bells 1 to provide solid bearing for entire body of pipe. N. Do not backfill trenches until tests and inspections have been made and backfilling authorized by Engineer. 3.04 PIPE INTERFERENCES 1 A. The contractor shall abide b the following schedule of criteria concerning Y 9 9 interferences with other utilities. 1. In no case shall there be less than 0.3 feet between et een any two ' pipelines and structures. 2. Class I Concrete Encasement: Wherever there is more than 0.3 1 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. !j 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, expedite ' completion and to avoid conflicts. 3.05 BACKFILLING A. Backfilling over pipes shall begin as soon as practical after the pipe has been laid, jointed, and inspected and the trench filled with suitable ' compacted material to the mid - diameter of the pipe. B. All backfilling shall be prosecuted expeditiously as work permits, but not 1 07106 02221 -9 05 -5564