Definitions. As used in the chapter, unless the context
or subject matter otherwise requires, the following terms shall have the following
meanings:
ACCEPTABLE DEVICES
Those devices or assemblies found to be acceptable for containment
control in New York State in accordance with the Genesee County Department
of Health requirements as outlined in Section 8 of the Cross Connection Control
Guide, January 1981. See appendix for determination of acceptability as taken
from this section.
AESTHETICALLY OBJECTIONABLE FACILITY
One in which substances are present, which if introduced into the
public water supply system could be a nuisance to other water customers, but
would not adversely affect human health. Typical examples of such substance
are: food-grade dyes, hot water, stagnant water from fire protection systems
in which no chemical additives are used, etc.
AIR GAP SEPARATION
The unobstructed vertical distance through the free atmosphere between
the lowest opening from any pipe or faucet supplying water to a tank, plumbing
fixture, or other device and the flood level rim of the receptacle. The differential
distance shall be at least double the diameter (d) of the supply pipe. In
no case shall the air gap be less than one inch. (See FIG. 1-A).
APPROVED CHECK VALVE
A check valve that seats readily and completely, and meets the New
York State Department of Health list of acceptable devices, as outlined in
Section 8-1 of the Cross Connection Control Guide, January 1981.
AUXILIARY SUPPLY
Any water supply on or available to the premises other than the approved
public water supply.
BACKFLOW
A condition, induced by a differential in pressure, that causes the
flow of water or other liquids and/or gases into the distribution pipes of
a public water supply from any source other than its intended source.
BACKPRESSURE
The resulting backflow of contaminated, polluted, or otherwise unacceptable
quality water from a plumbing fixture or other customer source(s) into a public
water supply system due to a greater pressure within the customer's water
system. (See FIG. 1-B)
Example: Only the valve at A separates the potable and the fire tank
water in a large factory. The factory's potable water system, at B, is
being filled from the public water supply system at C which is delivering
water at a pressure of 60 psi. At the same time, the fire-fighting system
is activated, which provides potentially stagnant tank water at a pressure
of 120 psi. If valve A in open, or leaks, the tank water will be forced into
the public water supply system.
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BACKSIPOHONAGE
The backflow of contaminated or polluted water, or water of questionable
quality from a plumbing fixture or other customer source(s), into a public
water supply system main due to a temporary low or subatmospheric pressure
within the public water supply system. (See FIG. 1-C)
Example: A hose is submerged in a laboratory sink A. Both buildings
are connected to the same public water supply system C. This main could develop
a low pressure due to a main break elsewhere in the system. The building on
the right has installed a booster pump in the system. The building on the
right has installed a booster pump in the basement at 8, in order to augment
available pressures. The booster pump could deplete the water in main C, thereby
subjecting the customer's water system to a pressure less than atmospheric
thus causing a reversal of flow from the laboratory in the opposite building.
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CERTIFIED BACKFLOW PREVENTION DEVICE TESTER
A person who is NYS Department of Health certified and found competent
for the testing of backflow prevention devices. He or she shall be provided
with an appropriate unexpired identification card. Failure to perform his
or her duties competently and conscientiously will result in prompt withdrawal
of his or her authority to test devices under this article.
CONTAINMENT
Cross-connection control which isolates the customer's entire
facility from the public water system so as to provide the protection necessary
to prevent contamination of the public water supply in the event of backflow
from the customer's facility.
CONTAMINATION
The presence in water of a substance that tends to degrade its quality.
CROSS-CONNECTION
A physical connection between the public water system and a customer
water system.
CUSTOMER
A water user served by a public water system; all water districts,
including individual private users outside the existing water districts, as
well as all out-of-Town customers.
CUSTOMER'S WATER SYSTEM
The piping used to convey water supplied by a public water supply
system from the point of supply throughout the customer's facility.
DEGREE OF HAZARD
Whether a facility is rated as "hazardous," "aesthetically objectionable"
or "nonhazardous."
DOUBLE CHECK VALVE (DCV) ASSEMBLY, ACCEPTABLE
Two single independently acting check valves, including tightly closing
shutoff valves located at each end of the assembly and suitable connections
for testing the watertightness of each check valve. This device must be approved
as a complete assembly, and listed on the NYS Department of Health list of
acceptable devices in Section 8 of the Cross Connections Control Guide. (See
FIG. 1-D)
HAZARDOUS FACILITY
One in which substances may be present which, if introduced into
the public water system, would or may endanger or have an adverse effect on
the health of other water customers. Typical examples: laboratories, sewage
treatment plants, chemical plants, hospitals, mortuaries.
INTERCONNECTION
A joining of two independently operated public water supply distribution
systems.
NONHAZARDOUS FACILITY
One which does not require the installation of an acceptable backflow
prevention device.
PLUMBING CONTROL
Prevention and elimination of cross-connections within the customer's
water system by enforcement of building or plumbing codes.
PUBLIC WATER SUPPLY SYSTEM
A NYS-approved supplier of water, including the source, treatment
works, transmission mains, distribution system and storage facilities serving
the public.
REDUCED PRESSURE ZONE (RPZ) DEVICE
Acceptable if found on the NYS Department of Health list of devices
as described in Section 8 of the Cross Connection Control Guide, January 1981.
The unit must include tightly closing shutoff valves located at each end of
the device, and each device shall be fitted with properly located test cocks.
This device must be approved as a complete assembly. See FIG. 1-E.
SUPPLEMENTARY SUPPLY
Any water source or system, other than the public water supply, that
is available within the water customer's facility.
WATER SUPERVISOR
The consumer or a person on the premises charged with the responsibility
of complete knowledge and understanding of the water supply piping within
the premises and for maintaining the consumer's water system free from
cross connections and other sanitary defects, as required by regulations and
laws.