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3.2.2.1.1 Sanitary sewers include the service pipe and
structures from the building(s) to the available utility stub or
connection point. The preferred pipe material for on-site
sanitary sewer is PVC pipe. If extremely deep burial or heavy
loads are encountered, the pipe may be installed in a steel
casing or the pipe type changed to cement-lined ductile iron
pipe. Sanitary sewer crossings of critical internal roadways,
which should not be disturbed or open cut in the future, should
be crossed using a steel casing around the sanitary sewer pipe.
The pipe section and bedding should be designed to withstand
the applied loads at its location.
3.2.2.1.2 Sanitary sewer manholes will be constructed of
precast concrete with cast iron covers and frames. Clean-outs
will be located at bends or changes in grade on any service line.
The junction of one or more service lines and the resulting
downstream sewer lateral should require a manhole.
3.2.2.1.3 Verify the capacity requirements for conveyance and
treatment for the sanitary sewer utility system to which the
project is connected. In general, private or municipal utility
systems will represent that the downstream pipes and sewers
are in serviceable condition to meet the needs of the project; the
utility company maintenance and replacement program is
traditionally funded by Tenant connection charges and use fees
to pay for maintenance and upgrading.
3.2.2.1.4 On Government installations, where in-place sanitary
sewer is to be incorporated into the project, it may be advisable
to conduct a television inspection of the sanitary sewer to verify
its serviceability for the proposed project. If the line is not in
serviceable condition, its replacement or rehabilitation will be
required. The Using Service and AR Installation will determine
who is responsible for that work. Government installation public
works utilities may not have implemented or budgeted for
sanitary sewer utility maintenance or upgrade in all areas of the
installation. Verification of the sewer serviceability, and
implementation and funding of repairs is required.
3.2.2.1.5 Sanitary sewer servicing OMS/AMSA facilities and
wash platform will require oil/water and grit separation. This is 2
accomplished by installation of separate structures within the
sanitary system. Coordination with the mechanical discipline is
required to determine if the separator structures are to be
installed within the building footprint or outside the building.
UFC 4-171-05
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