(A) All manholes for sanitary or storm sewers shall be made watertight and be of a size and dimensions as shown on the plans in Appendix A of this chapter.
(B) The base, riser sections, eccentric cone, flat slabs and adjustment rings shall be constructed in accordance with ASTM C478. The joints between the base, riser sections and the bottom joint of the eccentric cone shall be tongue- and-groove type with a continuous rubber ring gasket conforming to ASTM C443 or a preformed, flexible-plastic gasket-type joint sealant such as RUB’R-NEK, as manufactured by K. T. Synder Company, Kent Seal or an equal. In addition to the gasket, the joint shall be sealed on the exterior with an approved mastic.
(C) The top of the eccentric cone shall be joined to the adjustment rings, if necessary, using a preformed, flexible-plastic gasket-type joint sealant to obtain a watertight fit.
(D) The manhole frame and cover shall be sealed to the adjustment rings or cone section using a preformed, flexible-plastic gasket-type joint sealant.
(E) A watertight, flexible connection shall be made between the manhole and the sewer pipes using elastomeric gaskets conforming to ASTM C923. Gaskets shall be Kor-N-Seal, as manufactured by National Pollution Control Systems, Inc., of Miford, New Hampshire, or an equal, and shall be installed in strict conformance with the manufacturer’s instructions. The contractor shall apply a minimum 4,000 psi quick- set, non-shrink grout to the pipe penetration from inside the manhole.
(Ord. 2010-3, passed 10-6-2010)