Table 17 (Continued)
Service Pipe Materials 3
Non flexible pipe requires a flexible gooseneck at the
connection to main.
When cement-mortar lined as required by AWWA C104.
When PVC is in compliance with 40 CFR Part 141.50.
Stop -and -Waste Valve. Install this unit at the end of
service lines just inside the building wall.
Seismic Zones. Provide an earthquake valve in a pit
on water service lines to buildings as called for in US Army
TI-809-04, Triservice Engineering Manual for Seismic Design of
Installations. Refer to AWWA Standard C800,
Underground Service Line Valves and Fittings, and AWWA Manual
M6, Water Meters - Selection, Installation, Testing, and
Maintenance, for installation requirements. All connections
should be at least 10 ft away from any subsurface source
Irrigation Systems. Irrigation systems should be
designed using accepted commercial standards for the region
where the system will be constructed.
Sanitary Protection. To protect a potable system from
Backflow Prevention. Provide a pressure type vacuum
breaker or a reduced pressure type backflow preventer at each
point where an underground sprinkler system is connected to a
adequate when it is located aboveground, higher than the highest
sprinkler head and its elevation is above that which may be
flooded. Otherwise a reduced pressure backflow preventer is
required. Delete this requirement when the system is connected
to a nonpotable water supply system.