Sanitary piping installation parallel with water line

NOTE: Include the options "a" through "c" below for

LANTNAVFACENGCOM projects.

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[a.

Sanitary piping installation parallel with water line:

(1) Normal conditions: Sanitary piping or manholes shall be laid

at least 3 m 10 feet horizontally from a water line whenever

possible. The distance shall be measured edge-to-edge.

(2) Unusual conditions: When local conditions prevent a

horizontal separation of 3 m 10 feet, the sanitary piping or

manhole may be laid closer to a water line provided that:

(a) The top (crown) of the sanitary piping shall be at least 450

mm 18 inches below the bottom (invert) of the water main.

(b) Where this vertical separation cannot be obtained, the

sanitary piping shall be constructed of AWWA-approved ductile iron

water pipe pressure tested in place without leakage prior to

backfilling.

(c) The sewer manhole shall be of watertight construction and

tested in place.]

[b.

Installation of sanitary piping crossing a water line:

(1) Normal conditions: Lay sanitary sewer piping by crossing

under water lines to provide a separation of at least 450 mm 18

inches between the top of the sanitary piping and the bottom of

the water line whenever possible.

(2) Unusual conditions: When local conditions prevent a vertical

separation described above, use the following construction:

(a) Sanitary piping passing over or under water lines shall be

constructed of AWWA-approved ductile iron water pipe, pressure

tested in place without leakage prior to backfilling.

(b) Sanitary piping passing over water lines shall, in addition,

be protected by providing:

1. A vertical separation of at least 450 mm 18 inches between the

bottom of the sanitary piping and the top of the water line.

2. Adequate structural support for the sanitary piping to prevent

excessive deflection of the joints and the settling on and

breaking of the water line.

3. That the length, minimum 6.1 m 20 feet, of the sanitary piping

be centered at the point of the crossing so that joints shall be

equidistant and as far as possible from the water line.]

[c.

Sanitary sewer manholes: No water piping shall pass through or

come in contact with any part of a sanitary sewer manhole.]

3.1.1.2

Earthwork

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