2008-213 (5) - Laserfiche WebLink

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Where possible, the entire length of polyethylene pipe to be installed shall be joined and strung beyond the entrance of the bore path. hi no case shall the ingress and/or egress, to public or private property be completely blocked. Should the stringing of an entire section of pipe block such ingress and/or egress, the section of pipe shall be segmented in maximum lengths beyond the entrance of the bore path. Once strung out for insertion into the bore hole, the trace wire specified for all piping shall be laid along the top of the pipe segment and taped to the pipe along its entire length. There shall be no discontinuity in the trace wire, and where a splice is needed, it shall be prepared prior to beginning the pipe back pull. D. Separation and Clearance 1) The bore depth shall equal or exceed 10 times the bore size under F.D.O.T. pavements. 2) When installed outside of pavement, the off set parallel to the pavement edge must be at least 3 'h times the bore size clearance from vitrified clay pipe sanitary sewer and any gas main. 3) Bore installations shall maintain at least 3 '/2 times the bore size clearance from vitrified clay pipe sanitary sewer and any gas main. 4) Bore installations shall maintain at least 18 -inches of separation between any sewer line crossings. E. Directional Boring Boring of the pipeline hole shall follow applicable sections of the recommended standards of ASTM F 1962 "Use of Maxi -Horizontal Directional Drilling for Placement of P.E. Pipe or Conduit Under Obstacles, Including River Crossings". The CONTRACTOR shall have adequately sized boring/pullback equipment, self-contained drilling fluid recycling system equipment and a properly trained crew with classroom and field experienced personnel manning the primary job positions. 1) Machine Size & Capability — The size and capacity of the drilling equipment must be compatible with the thrust and torque required to perform the drilling, reaming, and pipe pullback operations. The estimated forces applied to the pipe_ may be considered a minimum equipment requirement. The CONTRACTOR'S equipment shall be capable of drilling through consolidated or loose sands and clay as well as cemented layers of lime rock (commonly known as "cap rock") that may vary from loose fragments to 2 or 3 foot thick sections. The CONTRACTOR'S equipment must include a self-contained, mobile slurry system, capable of pumping and recycling the drilling fluid. Cuttings from the drilling process shall be hauled and disposed of by the CONTRACTOR. Should the County desire the cuttings for fill, the CONTRACTOR shall haul the material to the desired disposal site. The disposal site shall be within a 10 mile drive from the furthest bore location. All drilling fluid, mud, clay, etc. shall be hauled and disposed of by the CONTRACTOR at an acceptable disposal site. 02400 = 7 L 02400 - Directional Bore Crossings