Manholes for sanitary sewers shall have a minimum inside diameter of 48 inches for 12 inch mains and a 60 inch diameter for greater than 12 inch but equal to or less than 24 inch main sizes. Manholes shall be constructed of precast reinforced concrete units or cast-in-place Portland Cement concrete in accordance with Section 32 of the State Standard Specifications for Water and Sewer Main Construction and shall comply with the East Dundee Sanitary Sewer Standards.
(A) Manhole location. Manholes shall be located at the junction of two sanitary sewer mains or at any change in grade, alignment, or size of pipe. The maximum spacing of manholes shall be 300 feet for sanitary sewers 15 inches and smaller and 400 feet for sanitary sewers larger than 15 inches in size.
(B) Precast concrete manholes shall be provided for this improvement conforming to the applicable portions of Division III, Section 32 of the State Standard Specifications for Water and Sewer Main Construction and village standards. The manhole bottom shall be precast with the first riser section. A flexible type joint shall be furnished at points of entry into and exit from manhole structures of design approved by the Village Engineer prior to installation. This flexible joint may consist of a sleeve of high quality synthetic rubber with a substantial serrated flange which is cast directly into the wall of the manhole base to form a tight waterstop and protrudes outside of the manhole wall to connect with the pipe entering/exiting the manhole. When this type of flexible joint is used, the sleeve shall slip over the end of the pipe adjacent to the manhole base and shall be secured by means of a stainless steel strap clamp equipped with a draw bolt and nut. The contractor may elect to utilize a modular mechanical type joint consisting of interlocking synthetic rubber links shaped to continuously fill the annular space between the pipe and wall opening. The links shall be loosely assembled with bolts to form a continuous rubber belt around the pipe with a pressure plate under each bolt head and nut. After the seal assembly is positioned in the sleeve, tightening of the bolts shall cause the rubber sealing elements to expand and provide an absolutely watertight seal between the pipe and manhole wall opening.
(C) Connections to existing manholes. A machine cored opening in the wall of existing manholes shall be provided to accommodate a flexible connector system. The system should consist of three component positive seal gasketing system similar in design to Press-Seal Gasket Corporation of Fort Wayne, Indiana (46852) PSX: SERIES SIX, POSITIVE SEAL. This connection system will enable the contractor to provide a flexible, water-tight connection to existing manholes. The three components should include a power sleeve, a gasket, and a take-up clamp. The sleeve is to be mechanically expanded to compress the gasket against the cored receptacle hole surface in the manhole wall. After adequate compression of the gasket is achieved, the ends of the power sleeve should interlock to insure against any loss of compression. The gasket system should be secure in the manhole ready to accept pipe of the class and diameter specified.
(D) Manhole appurtenances. The following items shall apply to all manhole structures:
(1) Manholes shall be furnished with a water-tight frame and solid cover (Neenah Foundry R-1077-B, East Jordon Works 1022 HD or approved equal) with the word "SANITARY" imprinted on the cover in raised letters.
(2) Both the manhole frame and cover shall have machined horizontal and vertical bearing surfaces.
(3) Pick holes shall not create openings in the manhole cover.
(4) Manholes located in areas subject to inundation shall be furnished with waterproof, bolt-down frames and covers (Neenah Foundry R-1916-F, East Jordan Iron Works 1045 ZPT or approved equal) with the word "SANITARY" imprinted on the cover in raised letters.
(5) Manhole frames shall be adjusted to proper grade utilizing reinforced, pre-cast concrete rings; brick or concrete blocks will not be allowed.
(6) Adjusting rings shall be securely sealed to the cone section or top barrel section of the manhole using an approved resilient, flexible, non-hardening, pre-formed bituminous mastic material. This mastic shall be applied in such a manner that no surface water or ground water inflow can enter the manhole through gaps between the top barrel section or cone section and the first adjusting ring, between adjusting ring, or between the last adjusting ring and the manhole frame. Up to six inches of adjusting rings may be installed on a given manhole.
(7) An exterior joint collar meeting A.S.T.M. C877-91 shall be used to provide a water-tight seal between manhole barrel sections, cone barrel section, and the cone section to frame and cover. The joint collar shall be joint sealer system as manufactured by Mar-Mac Manufacturing Company of McBee, South Carolina 29101 or an approved equal and shall be installed according to the manufacturer's recommendations. The collar shall consist of a band seven inches wide. The band shall have an outer layer of polyethylene with an under layer of rubberized mastic that is reinforced with a woven polypropylene fabric. There shall be a peelable protective paper against the mastic that is removed when the collar is applied to the joint. Within the collar two steel straps five-eighths inch wide shall be located three-quarter inches from each edge of the band. The straps shall be in tubes that isolate them from the mastic and allow them to slip freely when tightened around the pipe. The collar shall be designed so that when it is applied around the joint, the ends shall overlap at least six inches and when the straps are secured a layer shall completely cover the straps protecting them from moisture and rust. A bell hole shall be dug under the joint. After removing the protective paper, the band shall be placed around the pipe, mastic side to the pipe and spanning the joint, with the overlap at the top of the pipe. The steel straps shall be secured with the proper tools. The closing flap shall cover all remaining exposed strap.
(8) Hydraulic cement shall be used on all manhole interior joints (dress up).
(9) Manhole steps on maximum 16 inch centers shall be furnished with each manhole, securely anchored in place true to vertical alignment, in accordance with the East Dundee Standard.
(E) Drop manhole assemblies. Drop manhole assemblies shall be provided at the junction of sanitary sewers where the difference of grade of the inverts of the pipes exceeds two feet. The entire drop assembly shall be cast in concrete monolithically with the manhole barrel section for proposed manhole construction or constructed of ductile iron pipe strapped to the outside of existing manholes, if village permits, or of concrete encased drop assembly tied to the exterior wall of existing manholes by a method approved by the village.
(Ord. 07-57, passed 12-17-2007)