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DocuSign Envelope ID:81 E05E8E-EED7-43D3-8B8A-0811 OE72140A <br /> SECTION 33 34 00 - FORCE MAINS <br /> A. A detectable tape for protection of force mains shall be used when PVC or other non- <br /> metallic pipe is used as a material for the pipeline. The tape shall be an inert, bonded <br /> layer plastic with a metalized foil core and shall be highly resistant to alkalis, acid, or <br /> other destructive chemical components likely to be encountered in soils. The tape shall <br /> be brightly colored to contrast with soil and shall bear an imprint identifying the type of <br /> line buried below. The tape shall be a minimum of 2"wide. <br /> B. The tape shall be buried a maximum of 12" below the ground surface directly above the <br /> pipeline with printed side up. The Contractor shall take necessary precaution to insure <br /> that the tape is not pulled, distorted or otherwise misplaced in completed the trench <br /> backfill. <br /> 2.19 MANHOLE MATERIAL <br /> A. Manhole material shall consist of brick, concrete block, precast concrete in accordance <br /> with the following requirements. All material shall be approved by the Engineer prior to <br /> use. <br /> B. Brick shall be No. 2 Common, or equal; hard clay or shale; free from cracks and defects <br /> that would impair strength or usefulness. Brick shall conform to ASTM C32, Grade MM. <br /> C. Concrete manhole blocks shall be units meeting the requirements of ASTM Specification <br /> C139. Masonry units shall consist of barrel and cone block 6" thick, 7'/2" high and not <br /> over 15'/2" long. Barrel block shall be cast to a radius which will result in approximately <br /> 12 units to the course for a 4' diameter manhole, and proportionally thereto for manholes <br /> of greater diameter than 4'. Cone block shall be cast to produce a reduction of 6" in <br /> diameter per course. All units shall have a vertical groove at the ends. <br /> D. Precast concrete manholes shall consist of precast reinforced concrete sections, a <br /> conical or flat top section as required, and a base section conforming in general to the <br /> details shown on the Plans. Precast manhole sections shall be manufactured in <br /> accordance with ASTM Specification C478. The minimum compressive strength of the <br /> concrete for all sections shall be 4,000 psi. The maximum allowable absorption of the <br /> concrete shall not exceed 8% of the dry weight. <br /> E. The interior surfaces of manholes shall be factory coated as indicated in the plans. <br /> 2.20 MASONRY CEMENT <br /> Masonry cement shall be of best grade, conforming to ASTM Specification C91, Type II, of a <br /> brand approved by the Engineer. It shall be newly manufactured, well housed, and kept dry and <br /> protected at all times. <br /> 2.21 CASTINGS AND STEPS <br /> A. Castings and steps shall be provided for each manhole. Frames, covers, and stops shall <br /> be of cast iron of superior quality, tough and even texture, and of not less than 40% pig. <br /> They shall be clear of blow holes, holes and cracks, or other defects; properly finished <br /> and bituminous coated while hot. <br /> B. Manhole covers, frames, and steps shall conform to the details for each type manhole on <br /> the Plans, or to similar plans differing in details, but of equally good design; provided <br /> such castings are approved by the Engineer prior to use. Covers and frames shall be <br /> machined to provide plane, smooth surfaces for uniform seating and interchangeability of <br /> covers. Rings and covers that provide imperfect seating will be rejected. All covers and <br /> Orange County DAA PN R00592-225N2 <br /> Walnut Grove Wastewater System January, 2021 <br /> 33 34 00-7 <br />