Section 15080- Horizontal Directional Drilling

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15080 - 5/10 D. Drilling Fluid Recycling System: The drilling fluid recycling system shall separate sand, dirt and other solids from the drilling fluid to render the drilling fluid re-usable. Spoils separated from the drilling fluid shall be stockpiled for later use or disposal. 2.06 OTHER EQUIPMENT A. Pipe Rollers: Pipe rollers shall be of sufficient size to fully support the weight of the pipe while being hydro-tested and during pull-back operations. Sufficient number of rollers shall used to prevent excess sagging of pipe. B. Pipe Rammers: Hydraulic or pneumatic pipe rammers may only be used if necessary and with the authorization of Engineer. C. Restrictions: Other devices or utility placement systems for providing horizontal thrust other than those previously defined in the preceding sections shall not be used unless approved by the Engineer prior to commencement of the work. Consideration for approval will be made on an individual basis for each specified location. The proposed device or system will be evaluated prior to approval or rejection on its potential ability to complete the utility placement satisfactorily without undue stoppage and to maintain line and grade within the tolerances prescribed by the particular conditions of the project. 2.07 PIPE AND FITTINGS - HIGH DENSITY POLYETHYLENE (HDPE) A. High density polyethylene (HDPE) pipe used in directional drilling shall be as specified herein. B. Smooth wall high density polyethylene (HDPE) liner pipe shall be a Type III, Class C, Category 5, Grade P 34; PE 3408; as defined in ASTM D1248. Minimum cell classification, as given by ASTM 3350, shall be PE 335434C. Pipe shall meet the standards of ASTM F714, as modified herein, including the "Governmental/Military Procurement" sections. Minimum hydrostatic design basis shall be 1600 psi. In all cases, hydrostatic design basis and pressure rating shall be as determined using the methods of ASTM F714. Pipe of this type shall be butt-fusion welded at joints. All welding of joints shall be in strict conformity with the recommendations of the pipe manufacturer and performed by a firm or individual recommended in writing by the manufacturer. C. As a part of the shop drawing submittals, the Contractor shall furnish, signed by a Florida Registered Engineer, all calculations to determine, the pipe thickness, SDR rating, allowable stresses, in accordance with ASME B31.8, Table A842.22 and recommended coating, as required by the manufacturer. D. CONTRACTOR shall submit two spare transition couplings to the City as necessary to allow two complete transitions from the directionally drilled HDPE to PVC pipe. PART 3 - EXECUTION 3.01 GENERAL A. The installation shall be coordinated with Miami-Dade County and any other agency having jurisdiction over the area of work. The Contractor shall not begin work until he has received permission from the City and the governing authority to do so. In the event railroad companies, FDOT or governing agency require payment for any