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).
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.
B.
Force main. PVC pipe shall conform to ASTM D2241 with and SDR of
21.
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.
