Sanitary sewer facilities shall be furnished and installed to
adequately service the developments and shall conform to the town’s
sanitary sewer plan. The adequacy of the sewer facilities provided
by the subdivider shall be determined by the town.
(1998 Code, sec. 51.60)
The minimum diameter of sewer mains shall be eight inches. Six-inch
diameter sewer mains may be acceptable only for short distances (not
to exceed 400 feet) and only in locations approved by the town.
(1998 Code, sec. 51.62)
All vitrified clay sanitary sewer pipe joints shall be of the
premolded type conforming to ASTM designation C425.
(1998 Code, sec. 51.63)
Wherever possible, sewers shall be located in the alleys or
easements and shall be a minimum of five feet to six and one-half
feet deep to the invert.
(1998 Code, sec. 51.64)
All sewers shall be laid in straight alignment where possible,
with a uniform grade between the manhole. In those cases where horizontal
curvature must be utilized to serve a particular area, the minimum
radius of curvature shall be 100 feet. Grades and appurtenances of
sanitary sewers shall conform to the requirements of the department
of state health services, and the following are the minimum slopes
which should be provided for a velocity of at least 2.0 feet per second;
however, slopes greater than these are desirable:
Sanitary Sewer
(Diameter)
|
Minimum Slope in Feet Per 100 Feet
|
---|
4-inch (service mains)
|
1.000
|
6-inch
|
0.500
|
8-inch
|
0.330
|
10-inch
|
0.250
|
12-inch
|
0.200
|
15-inch
|
0.150
|
18-inch
|
0.110
|
21-inch
|
0.090
|
24-inch
|
0.080
|
27-inch
|
0.060
|
30-inch
|
0.055
|
36-inch
|
0.045
|
(1998 Code, sec. 51.65)
Prior to acceptance, the sanitary sewers shall be subject to
leakage tests. The leakage outward or inward (exfiltration or infiltration)
shall not exceed 200 gallons per inch of the pipe diameter per mile
per 24 hours for any section of the system. Other testing procedures
(exfiltration, air, and the like) may be used subject to the approval
of the town.
(1998 Code, sec. 51.66)
All lift stations shall be designed and constructed with two
or more sewage pumps, and the stations shall be capable of pumping
the design maximum flow with the largest pump-out of service. Detailed
design data, plans, and specifications of the pumps shall be submitted
to the town engineer prior to the purchase and installation of the
lift station unit.
(1998 Code, sec. 51.67)
Standard cleanouts shall be constructed at the ends of all sanitary
sewers where no further extensions will ever be made to the main.
(1998 Code, sec. 51.70)