Such service lines shall be laid on a straight
alignment and uniform gradient of not less than 1/4 inch per foot,
unless otherwise specifically authorized by the Director and having
all changes in direction made with approved fittings.
Except as otherwise provided in this division,
connections to sanitary sewers and stormwater drains shall be made
by means of forty-five-degree or ninety-degree M-D cut-in connections
of an approved size.
The use of an existing Y branch or other existing
fitting for the purpose of connecting a service line thereto shall
be allowed only when such branch or fitting is already available and
in place as a part of the sanitary sewer or stormwater drain, is in
satisfactory condition and at an acceptable location and is of adequate
size to receive such service line. Sanitary sewer connections directly
into manholes are prohibited.
Whenever the proposed service line to be connected
is greater than five inches when the sanitary sewer or stormwater
drain is eight inches or greater than six inches when the sanitary
sewer or stormwater drain is 10 inches or more, a manhole shall be
built over such sanitary sewer or stormwater drain at the point of
connection unless otherwise specifically authorized. The above sizes
refer to the internal diameter of the pipe or conduit.
Only M-D cut-in connections and other approved
types of connections shall be installed in such a manner that the
invert of such connection shall be higher than the invert of the sanitary
sewer or stormwater drain by an amount not less than 1/2 the vertical
diameter of such sanitary sewer or not less than 3/4 the vertical
diameter of such stormwater drain, unless otherwise authorized by
the Director.
Connections to an existing cast-iron pipe sanitary
sewer or stormwater drain shall be made by burning an opening in such
pipe in an approved manner or by such other means as may be authorized
by the Director.
When the difference in invert elevation in the
manhole at the point of connection exceeds three feet, a drop connection
shall be installed in such manhole.
Adequate provision shall be made so that the
discharge from a service line within a manhole shall be conducted
smoothly into and in the direction of flow of the main channel of
the sanitary sewer or stormwater drain by means of a built-up channel
or by extending such service line partly into the manhole as may be
necessary and in such manner as may be approved by the Director.
Construction of new manholes, drop connections
and any other necessary structures and connections to existing structures,
shall conform with such specifications as may be promulgated by the
Director. In general, the current standard specifications and construction
details of the Department of Public Works shall be followed, subject
to the prior approval of the Director.