[Code 1991, § 18-56]
The following words, terms and phrases, when used in this division,
shall have the meanings ascribed to them in this section, except where
the context clearly indicates a different meaning:
AIR GAP SEPARATION
The unobstructed vertical distance through the free atmosphere
between the lowest opening from any pipe or faucet supplying pure
water to a tank, plumbing fixture, or other device and the rim of
the receptacle.
AUXILIARY WATER SYSTEM
Any water system other than the City waterworks. These auxiliary
systems may include water from sources such as wells, lakes, or streams;
process fluids; or used water. They may be polluted, contaminated
or objectionable, or constitute a water source or system over which
the water purveyor does not have control.
BACKFLOW
The flow of contaminants, pollutants, process fluids, used
water, untreated waters, chemicals, gases, or nonpotable waters in
any part of a waterworks.
CONSUMER
The owner or person in control of any premises supplied by
or in any manner connected to a waterworks.
CONSUMER'S WATER SYSTEM
Any water system located on the consumer's premises,
supplied by or in any manner connected to a waterworks.
CONTAMINATION
Any introduction into pure water of microorganisms, wastes,
wastewater, undesirable chemicals, or gases.
CROSS CONNECTION
Any connection or structural arrangement, direct or indirect,
to the waterworks whereby backflow can occur.
DEGREE OF HAZARD
An evaluation of the potential risk of health and the adverse
effect upon the waterworks.
DOUBLE GATE - DOUBLE CHECKVALVE ASSEMBLY
An approved assembly composed of two single, independently
acting checkvalves including tightly closing shutoff valves located
at each end of the assembly and petcocks and test gauges for testing
the watertightness of each checkvalve.
HEALTH HAZARD
Any condition, device, or practice in a waterworks or its
operation that creates, or may create, a danger to the health and
well-being of a water consumer.
POLLUTION
The presence of any foreign substance, chemical, physical,
radiological, or biological, in water that tends to degrade its quality
so as to constitute an unnecessary risk or impair the usefulness of
the water.
POLLUTION HAZARD
A condition through which an aesthetically objectionable
or degrading material may enter the waterworks or a consumer's
water system.
PROCESS FLUIDS
Any fluid or solution which may be chemically, biologically,
or otherwise contaminated or polluted which would constitute a health,
pollutional, or system hazard if introduced into the waterworks. This
includes but is not limited to:
A.
Polluted or contaminated waters.
C.
Used waters originating from the waterworks which may have deteriorated
in sanitary quality.
E.
Contaminated natural waters taken from wells, lakes, streams,
or irrigation systems.
F.
Chemicals in solution or suspension.
G.
Oils, gases, acids, alkalis, and other liquid and gaseous fluids
used in industrial or other processes, or for firefighting purposes.
PURE WATER and POTABLE WATER
Water fit for human consumption and use which is sanitary
and normally free of minerals, organic substances, and toxic agents
in excess of reasonable amounts for domestic usage in the area served
and normally adequate in supply for the minimum health requirement
of the person served.
REDUCED PRESSURE PRINCIPAL BACKFLOW PREVENTION DEVICE
A device containing a minimum of two independent action checkvalves
together with an automatically operated pressure differential relief
valve located between the two checkvalves. During normal flow and
at the cessation of normal flow, the pressure between these two checks
shall be less than the supply pressure. In case of leakage of either
checkvalve, the differential relief valve, by discharging to the atmosphere,
shall operate to maintain the pressure between the checkvalves at
less than the supply pressure. 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. These devices must
be of an approved type.
SERVICE CONNECTION
The terminal end of a service line from the waterworks. If
a meter is installed at the end of the service, then the service connection
means the downstream end of the meter.
SYSTEM HAZARD
A condition posing an actual or threat of damage to the physical
properties of the waterworks or a consumer's water system.
USED WATER
Any water supplied by a water purveyor from waterworks to
a consumer's water system after it has passed through the service
connection.
WATERWORKS
All structures and appliances used in connection with the
collection, storage, purification and treatment of water for drinking
or domestic use and the distribution thereof to the public or residential
consumers by the City's water production and distribution system
as set forth in Code of Virginia, § 32.1-167 et seq.