(A) Manholes shall be manufactured in accordance with A.S.T.M. C478 and shall be precast with monolithic base and eccentric cone. All manholes will be a 40-inch inside diameter with five-inch walls or 50 inches with six-inch thick walls and have a six-inch minimum base.
(B) All manholes over 100 inches deep (top rim to lowest point) shall be 50 inches in diameter. All manholes with 21-inch or larger pipes will be 50 inches. The standard joint shall be sealed with plastic cement putty meeting Federal Specifications SS-C-153. O ring joints shall conform to the requirements of A.S.T.M. C443. A rubber water stop shall be supplied with the manholes to tie the pipe to the barrel section. These gaskets and clamps shall meet the requirements of A.S.T.M. C923.
(C) Manholes deeper than 30 inches shall have steps. Manhole steps will be press set plastic or approved equal. Steps will also be provided on the outside of raised manholes when the top elevation is greater than three feet above the existing ground elevation.
(D) All commercial and industrial discharges shall provide a monitoring manhole easily accessible and in accordance herewith. All discharge from the property must pass through one monitoring manhole before entering the public sewer system.
(Ord. passed 6-21-2011)