The protective device required shall depend on the degree of hazard
as tabulated below:
A. At the service connection to any premises where there
is an approved auxiliary water supply handled in a separate piping system
with no known cross-connection, the public water supply shall be protected
by an approved double check valve assembly.
[Amended 5-13-1991 by L.L.
No. 8-1991]
B. At the service connection to any premises on which there
is an auxiliary water supply where cross-connections are known to exist which
cannot be presently eliminated, or where the auxiliary water supply is not
approved, the public water supply system shall be protected by an air gap
separation or an approved reduced pressure principle backflow prevention device.
[Amended 5-13-1991 by L.L.
No. 8-1991]
C. At the service connection to any premise on which a substance
that would be objectionable (but not necessarily hazardous to health if introduced
into the public water supply) is handled so as to constitute a cross-connection,
the public water supply shall be protected by an approved double check valve
assembly.
D. At each service connection from a public water system
for supplying water to premises on which any substance that is unusually toxic
or a danger to human health is or may be handled in liquid form, or in solid
or gaseous form if such substance is intended to be used after conversion
to liquid form, even if it is not under pressure, the public water supply
shall be protected by an air-gap separation or an approved reduced pressure
principle backflow prevention device. This device shall be located as close
as practicable to the water meter, and all piping between the water meter
and receiving tanks shall be entirely visible.
[Amended 5-13-1991 by L.L.
No. 8-1991]
E. At each service connection from a public water system
for supplying water to premises on which any substance that is unusually toxic
or dangerous to human health is or may be handled under pressure, the public
water supply shall be protected by an air-gap separation or an approved reduced
pressure principle backflow prevention device. The air gap shall be located
as close as practicable to the water meter, and piping between the water meter
and receiving tanks shall be entirely visible. If these conditions cannot
reasonably be met, the public water supply shall be protected with an approved
reduced pressure principle backflow prevention device, providing the alternative
is acceptable to the Water Purveyor.
[Amended 5-13-1991 by L.L.
No. 8-1991]
F. At the service connection to any sewage treatment plant
or sewage pumping station, the public water supply shall be protected by an
air gap separation. The air gap shall be located as close as practicable to
the water meter and all piping between the water meter and receiving tanks
shall be entirely visible. If these conditions cannot be reasonably met, the
public water supply shall be protected with an approved reduced pressure principle
backflow prevention device.
[Amended 5-13-1991 by L.L.
No. 8-1991]
See Article
VII, Supplementary Provisions to CCC Law, of Part
2, Supplementary Cross-Connection Control, of this chapter.