(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.
(B) Joints for manhole sections will have a flexible butyl rubber joint gasket conforming to ASTM C-443.
(C) Manhole frames and covers shall have machined horizontal and vertical bearing surfaces. All frames and covers shall be products of one manufacturer.
(D) Steps for manholes shall be polypropylene, polypropylene-coated steel reinforcing, or an approved non-corrosive fiberglass material. The copolymer polypropylene shall meet the requirements of ASTM D-4101 reinforced with deformed three-eighths-inch minimum diameter reinforcing steel conforming to the requirements of ASTM A-615, Grade 60. Non-coated cast iron steps are not acceptable.
(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. 2003-8-2, passed 8-26-03; Am. Ord. 2013-3-1, passed 3-28-13)