2021-205-E-Solid Waste-Full Circle Environmental-Walnut Grove Wastewater Disposal System

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DocuSign Envelope ID:81 E05E8E-EED7-43D3-8B8A-0811 OE72140A SECTION 33 34 00 - FORCE MAINS E. For mechanical joint pipe, Type II, the rubber rings shall be properly lubricated and the spigots and bells cleaned before assembling the joint. Nuts of bolted joints shall be tightened with special torque limiting wrenches set to provide the proper strain on the bolt, and all nuts tightened to that limit. F. Rubber ring joints, Type III, shall be assembled in accordance with the manufacturer's instructions. The bell and spigot shall be absolutely clean prior to seating of the gasket. The gasket shall be wiped clean, flexed and properly inserted into the socket and seated evenly and properly. Care shall be taken to eliminate any bulges which might interfere with the proper entry of the spigot. A thin film of lubricants, shall be applied to the inside surface of the gasket. The spigot shall then be completed by forcing the spigot into the bell until it makes contact with the bottom of the socket. This shall be done by use of pipe jack and assembly, or other methods as approved by the Engineer. G. Fittings shall be installed where shown on the plans or directed by the Engineer. They shall be handled and installed in the same manner as the pipe and all shall be well blocked as hereinafter specified. H. Concrete for blocking and protection shall be poured in accordance with the following requirements. All fittings, bends, dead ends, etc., shall be acceptably blocked with concrete having bearing on undisturbed earth in the side and/or bottom of the trench. Bearing area shall be equal to that shown on the plans and greater if deemed necessary by the Engineer. No concrete shall be poured or splattered on fittings bells, glands, or bolts. I. Where shown on the plans, or directed by the Engineer, concrete supports, walls, or other protective work shall be constructed. J. Contractor shall take elevation shots every 100 feet on the installed force main pipe along the entire route to ensure positive and uniform grades to each air release valve. The elevations shall be recorded by the Contractor with a record provided to the Engineer. 4.5 BACKFILLING OF TRENCHES A. Backfilling of trenches shall be completed after the installation of each section of pipe laying to the satisfaction of the Engineer. B. Backfilling around the pipe and to a depth of at least 1' above the top of pipe shall be placed by hand in layers of not over 6". Only select material containing no rock or other objectionable material shall be used for this portion of the backfill. As fast as the material is place, it shall be cut under the haunches of the pipe with a shovel and thoroughly compacted with mechanical tamps for the full width of the trench to provide support for the bottom and sides of the pipe. Filling shall be carried up evenly on both sides. C. The balance of the backfill shall be placed and tamped to prevent excessive settlement in a manner satisfactory to the Engineer. If the trench backfill is located under miscellaneous paved areas, areas to be paved, or unpaved streets, the trench shall be backfilled with suitable material free from large stones or clods in 8" layers (loose measurement) and thoroughly tamped and compacted to 95% of maximum as established by AASHTO Specification T99, Method A, with mechanical tampers, so as to avoid future settlement. Where applicable, the compaction shall be acceptable to the Department of Transportation or Owner. D. For pipe outside street limits, compaction shall be at least 90% maximum as established by AASHTO Specification T99, Method A. Orange County DAA PN R00592-225N2 Walnut Grove Wastewater System January, 2021 33 34 00-15