Laserfiche WebLink
SECTION 4 – SANITARY <br />57 <br />viii. Immediately after installation of the HDPE Pipe, the pipe shall be filled with clean <br />potable water to offset buoyancy. <br />ix.Drilling fluids shall not be discharged into sanitary sewers, storm sewers, or <br />waterways. Pits shall be constructed at the pipe entry and exit points to completely <br />contain the drilling fluid and prevent its escape into waterways. <br />x.The spoils shall be recovered by use of a vacuum system mounted on a vehicle for <br />removal of the spoils. Spoils are not to be discharged into sewers, storm drains, or <br />waterways. <br />xi.Equipment shall be fitted with a permanent alarm system capable of detecting an <br />electrical current. The system will have an audible alarm to warn the ope rator when <br />the drill head nears electrified cables within a safe operating distance. <br />5.) The Contractor conducting the horizontal directional drilling shall demonstrate experience and <br />expertise in trenchless excavation methods by providing a list of four (4) references for which <br />similar work has been performed prior to commencing any work. These references shall <br />include a name and telephone number for contact, so the City Engineer may verify the claims. <br />6.) All supervisory personnel shall be adequately trained and shall have at least four (4) years of <br />experience in horizontal directional drilling. <br />4-3.5 (f) PIPE CUTTING <br />Cutting of pipe shall be done in a neat and workmanlike manner without damage to the pipe. Unless <br />otherwise recommended by the manufacturer and authorized by the Engineer, cutting shall be done <br />with an approved type of mechanical cutter. A wheel cutter shall be used when practicable. Squeeze <br />type mechanical cutters shall not be used for ductile iron. <br />4-3.5 (g) RESTRAINED JOINTS <br />Restrained joints on pressure pipe shall be placed at fittings, upstream and downstream of the <br />fitting. Length of restraint shall be determined by the Design Engineer. <br />4-3.5 (h) COVER REQUIREMENTS <br />The gravity sanitary sewer shall be installed with a minimum depth of cover of three (3) feet. The <br />force main pipe shall be installed with a minimum depth of cover of five (5) feet. The force main <br />may be required to be installed at a deeper depth to maintain the required eighteen (18) inches <br />vertical separation distance from water mains.