(A) Manholes shall be precast concrete manhole risers with eight-inch precast concrete base and shall meet the requirements of ASTM C 478. Precast concrete manhole cones shall be of concentric cone type and meet the requirements of ASTM C 478. Manhole risers shall be 48 inches I.D. unless otherwise noted on the drawings. Concentric cone sections shall have a 24-inch opening.
(B) Joints for manhole sections shall have a flexible butyl rubber joint gasket conforming to ASTM C 443.
(C) Manhole frames and lids shall have machined horizontal and vertical bearing surfaces. Watertight frames and lids for sanitary sewers shall have a grooved rubber gasket with concealed pick holes and shall be as manufactured by Neenah Foundry, No. R-1772-C or approved equal. All frames and lids shall be products of one manufacturer.
(D) Steps for manholes shall be made from steel reinforcing rod encapsulated in a copolymer polypropylene resin as manufacturer by M.A. Industries, Inc., Clay & Bailey Manufacturing Company or approved equal.
(E) Each manhole shall be core-drilled at the proper location where the pipe enters the manhole. A flexible neoprene molded boot shall be installed to secure the pipe. The boot shall be Kor-N-Seal as manufactured by National Pollution Control Systems, Inc. or approved equal.
(Ord. 2002-5-1, passed 5-14-02; Am. Ord. 2013-3-1, passed 3-28-13)