Current through Register Vol. 48, No. 38, September 20, 2024
Water mains and water service lines shall be protected from
sanitary sewers, storm sewers, combined sewers, house sewer service connections
and drains as follows:
a) Water Mains:
1) Horizontal Separation:
A) Water mains shall be laid at least ten
feet horizontally from any existing or proposed drain, storm sewer, sanitary
sewer, combined sewer or sewer service connection.
B) Water mains may be laid closer than ten
feet to a sewer line when:
i) local
conditions prevent a lateral separation of ten feet;
ii) the water main invert is at least 18
inches above the crown of the sewer; and
iii) the watermain is either in a separate
trench or in the same trench on an undisturbed earth shelf located to one side
of the sewer.
C) Both
the water main and drain or sewer shall be constructed of slip-on or mechanical
joint cast or ductile iron pipe, asbestos-cement pressure pipe, prestressed
concrete pipe, or PVC pipe meeting the requirements of Section
653.111
when it is impossible to meet (A) or (B) above. The drain or sewer shall be
pressure tested to the maximum expected surcharge head before
backfilling.
2) Vertical
Separation:
A) A water main shall be laid so
that its invert is 18 inches above the crown of the drain or sewer whenever
water mains cross storm sewers, sanitary sewers or sewer service connections.
The vertical separation shall be maintained for that portion of the water main
located within ten feet horizontally of any sewer or drain crossed. A length of
water main pipe shall be centered over the sewer to be crossed with joints
equidistant from the sewer or drain.
B) Both the water main and sewer shall be
constructed of slip-on or mechanical joint cast or ductile iron pipe,
asbestos-cement pressure pipe, prestressed concrete pipe, or PVC pipe meeting
requirements of Section
653.111
when:
i) it is impossible to obtain the
proper vertical separation as described in (A) above; or
ii) the water main passes under a sewer or
drain.
C) A vertical
separation of 18 inches between the invert of the sewer or drain and the crown
of the water main shall be maintained where a water main crosses under a sewer.
Support the sewer or drain lines to prevent settling and breaking the water
main.
D) Construction shall extend
on each side of the crossing until the normal distance from the water main to
the sewer or drain line is at least ten feet.
b) Water Service Lines:
1) The horizontal and vertical separation
between water service lines and all storm sewers, sanitary sewers, combined
sewers or any drain or sewer service connection shall be the same as water main
separation described in (a) above.
2) Water pipe described in (a) above shall be
used for sewer service lines when minimum horizontal and vertical separation
cannot be maintained.
c)
Special Conditions - Alternate solutions shall be presented to the Agency when
extreme topographical, geological or existing structural conditions make strict
compliance with (a) and (b) above technically and economically impractical.
Alternate solutions will be approved provided watertight construction
structurally equivalent to approved water main material is proposed.
d) Water mains shall be separated from septic
tanks, disposal fields and seepage beds by a minimum of 25 feet.
e) Water mains and water service lines shall
be protected against entrance of hydrocarbons through diffusion through any
material used in construction of the line.
