City of Bridgman, MI
Berrien County
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Table of Contents
Table of Contents
Except as otherwise provided herein, no residential, commercial or industrial subdivision or development including single lots shall be approved unless it is served by sanitary sewers connected to the City sewerage system.
A. 
Before commencing the sewer layout, the developer shall confer with the City Engineer to determine the required size and grades for any trunk sewers traversing the subdivision or lot to fit the City's available capacities of off-site downstream existing facilities with the estimated increment of flow caused by the subdivision, proposed development, and any future off-site development. Construction required to accommodate said increment shall be submitted as part of engineering plans. Sanitary sewers shall be extended to the far edge of the development and at other locations indicated by the City Engineer.
B. 
All sanitary sewers shall be extended to the far property line and shall be constructed within public rights-of-way or within approved easements dedicated for public utilities.
C. 
All attached and detached single-family dwelling units shall be served by separate sanitary sewer services to be directly connected to the City sewerage system and not to be of common service. Each sanitary sewer service stub shall be plugged and staked a minimum of one foot inside of the lot line with a four-inch-by-four-inch post not less than three feet above grade painted green in color. A twenty-four-inch-long No. 4 rebar shall also be located adjacent to the post, buried no more than 1/2 inch for the ease of location should the wood post be cut off or removed.
A. 
Residential sewer design flows.
(1) 
Design flows for all residential developments shall be based upon full development of the service area within the population served, estimated as follows:
Type of Dwelling Unit
Number of Persons
Apartment
Studio
1
1 bedroom
1.5
2 bedroom
3
3 bedroom
4
Single-family dwelling
4
Mobile home
3
(2) 
For undeveloped residential areas where the details of future developments are not known, design population per acre may be estimated based on generally accepted engineering principles and the "Recommended Standards for Wastewater Facilities" prepared by the Great Lakes Upper Mississippi River Board of Public Health and Environmental Managers (10 States Standards).
B. 
Nonresidential design flows.
(1) 
Design flows for nonresidential developments shall be based on full development of service area, including any process water requirements with the maximum daily per capita design flow estimated based on generally accepted engineering principles and standards approved by the City Engineer.
(2) 
Such flow estimate shall not relieve the owner or developer of the responsibility of providing adequate sewer capacity to meet any and all future requirements within the development.
C. 
Sewerage flow capacity. The design of sewage flow and capacity shall be based on estimated populations for all proposed developments and the ratio of peak flow to daily average flow in accordance with the "Recommended Standards for Wastewater Facilities" prepared by the Great Lakes Upper Mississippi River Board of Public Health and Environmental Managers (10 States Standards).
A. 
Sanitary sewer. Minimum sanitary sewer size shall be eight-inch diameter.
B. 
Building sewer. Minimum building sanitary service sewer size shall be six-inch diameter.
Sewer shall be laid straight in both horizontal and vertical planes between manholes, unless otherwise approved by the City Engineer.
Sanitary sewer of different diameter shall join only at manholes, except that a four-inch-by-six-inch increaser may be used for a single-family detached dwelling if a sweep bend tee wye cleanout is provided five feet outside the house foundation when approved by the Director of Public Services based upon advise of the City Engineer. The invert elevations shall be adjusted to maintain a uniform energy gradient by matching the 0.8 depth points of different diameters.
A. 
Manhole locations. Manholes shall be provided in conformance with the "Recommended Standards for Wastewater Facilities" prepared by the Great Lakes Upper Mississippi River Board of Public Health and Environmental Managers (10 States Standards).
Whenever possible, sanitary sewerage facilities shall be designed so as to avoid the necessity of providing lift stations.
A. 
If a lift station is part of the engineering design, it shall be shown in plan and elevation. Specifications for said lift station shall be submitted with engineering plans. Lift station shall be of the submersible wet well type, and shall conform in all respects to the standards established by the City Engineer and the Michigan Department of Environment, Great Lakes and Energy (EGLE).
B. 
A separate source of power (mobile or stationary) shall be furnished to each lift station, as recommended by the City Engineer. This shall be from another electrical source or provided by a separately powered engine. The engine, enclosure and mounting shall be subject to approval by the City Engineer. A remote alarm with phone service and automatic dialer shall be installed and maintained to indicate failure at the lift station.
A. 
Sewer pipe.
(1) 
Ductile iron pipe shall conform to the requirements of ANSI A21.51, Class 50 with cement lining with ANSI A-21.4, standard thickness.
(2) 
PVC pipe shall conform to the requirements of ASTM D-3033 or D-3034.
B. 
Force main. PVC pipe shall conform to ASTM D2241 with and SDR of 21.
C. 
Pipe joints.
(1) 
Ductile iron pipe: ANSI A-21.11 (AWWA C-11).
(2) 
PVC pipe: ASTM D-3212 and F-477.
D. 
Manholes.
(1) 
Precast reinforced concrete: ASTM C-478 and ASTM C-443.
(2) 
Adjustment: no more than two precast concrete adjusting rings with an eight-inch maximum height adjustment.
(3) 
Pipe and frame seals: All pipe connection openings shall be precast with resilient rubber, water tight, pipe to manhole sleeves.
(4) 
Bottom section: All bottom sections for new sewer lines shall be monolithically precast including bases and invert flowlines. Provide separate base for existing sewer lines.
(5) 
Joints: preformed bituminous plastic gaskets to completely seal.
(6) 
Steps: Provide minimum twelve-inch-wide copolymer propylene plastic with a continuous half-inch steel reinforced as manufactured by M.A. Industries, or equal.
(7) 
Connections to existing manholes: Make all connections to existing manholes using a flexible rubber gasket collar and a cored hole. Make connections watertight.
(8) 
Provide eccentric cone section unless otherwise approved by the City Engineer.
E. 
Castings.
(1) 
Manhole frame and cover: EJIW No. 1000Z with gasket seal cover, or approved equal, with self-sealing lid, embossed "sanitary."
(2) 
Recessed pickholes shall be required.
(3) 
Frames and covers for manholes located within floodplain areas and having a rim elevation below the flood protection elevations shall be watertight, lock-type covers approved by the City Engineer.
F. 
Granular pipe bedding and covering materials. All pipe shall be bedded firmly on undisturbed earth with bell holes excavated beneath the bells. Bedding shall be in accordance with ASTM C-12 requirements for Class B Bedding. Back fill with MDOT Class II materials beneath the roads, sidewalks and other areas to be paved.