1 March 1997
hoist attachments. For enclosed stations, provisions will be included in the structure to facilitate
access for repair, and to provide a means for removal and loading of equipment onto a truck.
2-6. PROTECTION OF WATER SUPPLIES. There must be no physical connection between a
potable water line and the sewer system. Sewer design will meet the following criteria:
- Sewers will be located no closer than 15 meters (50 feet) horizontally to water wells or
earthen reservoirs to be used for potable water supply.
- Sewers will be located no closer than 3 meters (10 feet) horizontally to potable water lines;
where the bottom of the water pipe will be at least 300 millimeters (12 inches) above the top of
the sewer, the horizontal spacing may be a minimum of 2 meters (6 feet).
- Sewers crossing above potable water lines must be constructed of suitable pressure pipe or
fully encased in concrete for a distance of 3 meters (10 feet) on each side of the crossing. Force
mains will have no joint closer horizontally than 1 meter (3 feet) to the crossing, unless the joint is
encased in concrete. The thickness of the concrete encasement will be a minimum of 100
millimeters (4 inches) at pipe joints.
- Depressed sewers crossing potable water lines must be installed below the water line with
a minimum vertical clearance of 600 millimeters (2 feet). Sewer joints will not be closer
horizontally than 1 meter (3 feet) to the crossing, unless the joints are fully encased in concrete
as required above.