For the purpose of this article, the following words shall have
the meaning indicated unless clearly indicated otherwise in the text:
AIR GAP SEPARATION
The unobstructed vertical distance through the free atmosphere
between the lowest opening from any pipe or faucet supplying potable
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 (2 x D) of the supply pipe, measured vertically,
above the top of the rim of the vessel. In no case shall the air gap
be less than one inch.
APPROVED
That a backflow prevention device or method has been accepted
by the Borough as suitable for the proposed use.
ATMOSPHERIC VACUUM BREAKER
(Also known as the "non-pressure-type vacuum breaker.") A
device containing a shutoff valve followed by a valve body containing
a float check, a check seat and an air inlet port. When the shutoff
valve is open, the flow of water causes the float to close the air
inlet port. When the shutoff valve is closed, the float falls and
forms a check valve against backsiphonage and at the same time opens
the air inlet port.
AUXILIARY WATER SYSTEM
Any water source or system on the premises of or available
to the consumer except connections to other approved community water
supply systems.
BACKFLOW
A flow condition, induced by a differential in pressure,
that causes the flow of water or mixture of water and other liquids,
gases or other substances into the distribution pipes of a potable
water supply system from a source other than its intended source.
BACKFLOW PREVENTER
A device or other means which will prevent the backflow of
water or liquids of questionable quality into the public water system.
BACKSIPHONAGE
The backflow of water or mixture of water and other liquids,
gases or other substances from a plumbing fixture or other customer
source into the Borough's public water system main due to a temporary
negative or subatmospheric pressure within the public water system.
BOROUGH
The Borough of West Grove, Chester County, Pennsylvania.
CONSUMER
The owner or person in control of any premises supplied by
or in any manner connected to the public water system.
CONSUMER'S WATER SYSTEM
Any water system located on the consumer's premises
supplied by or in any manner connected to the public water system.
A household plumbing system is considered to a consumer's water
system.
CONTAINMENT
Cross-connection control which isolates the customer's
entire facility from the public water supply 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 degradation of the quality of the drinking water by wastewaters,
processed fluids or any water of a quality less than accepted drinking
water quality to a degree which would create an actual hazard to the
public health through poisoning or through the spread of disease.
CROSS-CONNECTION
An arrangement allowing either a direct of indirect connection
through which backflow, including backsiphonage, can occur between
the drinking water in the public water system and a system containing
a source or potential source of contamination.
DEGREE OF HAZARD
An evaluation of the potential risk to health and the adverse
effect upon the public water system.
DOUBLE CHECK VALVE ASSEMBLY
An assembly composed of 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.
HEALTH HAZARD
Any condition, device or practice in a water system or its
operation that creates, or may create, a danger to the health and
well being of its users. The work "severe" as used to qualify "health
hazard" means a hazard to the health of the user that could reasonably
be expected to result in the significant morbidity or death.
PERSON
Any individual, partnership, association, company, corporation,
municipality, municipal authority, political subdivision or any agency
of federal or state government. The term includes the officers, employees
and agents of any partnership, association, company, corporation,
municipality, municipal authority, political subdivision or any agency
of federal or state government.
POLLUTION
The presence in water of any foreign substance that tends
to degrade its quality so as to constitute a hazard or impair the
usefulness or quality of the water to a degree which does not create
and actual hazard to the public health but which does adversely and
unreasonably affect such waters for domestic use.
POTABLE WATER
Water which is satisfactory for drinking, culinary, and domestic
purposes and meets the requirements of the Department of Environmental
Protection.
PROCESS FLUIDS
Any fluid or solution which may be chemically, biologically
or otherwise contaminated or polluted in a form or concentration such
as would constitute a health, pollutional or system hazard if introduced
into the public or a consumer's water system. This includes,
but is not limited to:
A.
Polluted or contaminated waters;
C.
Used waters originated from the public water system which may
have deteriorated in sanitary quality;
E.
Contaminated natural waters taken from wells, lakes, streams,
or irrigation system;
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;
H.
Heating system waters from boilers or heat pumps.
PUBLIC WATER SYSTEM
The water system owned and operated by the Borough of West
Grove. The term includes any collection, treatment, storage and distribution
facilities under control of the Borough and used in connection with
the system. The term includes collection or pretreatment storage facilities
not under such control which are used in connection with the system.
REDUCED-PRESSURE-ZONE (RPZ) DEVICE
A minimum of two independently acting check valves, together
with an automatically operated pressure differential relief valve
located between the two check valves. 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 check
valve, the differential relief valve, by discharging to the atmosphere,
shall operate to maintain the pressure between the checks 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.
SERVICE CONNECTION
The terminal end of a service line from the public water
supply system. 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 a actual or potential threat of damage
to the physical properties of the public water system or the consumer's
potable water system.
The type of protection required under §
387-11A,
B and
C of these regulations shall depend on the degree of hazard which exists, as follows:
A. An approved air gap separation shall be installed where the public
water system may be contaminated with substances that are dangerous
to the public health and could cause a severe health hazard.
B. An approved air gap separation or an approved reduced-pressure-zone
backflow prevention device shall be installed where the public water
system may be contaminated with a substance that could cause the system
a health hazard.
C. An approved air gap separation or an approved reduced-pressure-zone
backflow prevention device or an approved double check valve assembly
shall be installed where the public water system may be polluted with
substances that would be objectionable but not dangerous to health.