Definitions. The following definitions shall apply in the interpretation
and enforcement of this section:
APPROVED
As herein used, in reference to a physical separation, a
reduced-pressure principle backflow prevention assembly, a double-check
valve assembly, a pressure vacuum breaker, and atmospheric vacuum
breaker, or other backflow prevention assemblies or methods, means
approved by the appropriate testing laboratory.
APPROVED TESTING LABORATORY
The Foundation for Cross-Connection Control and Hydraulic
Research at the University of Southern California which has equivalent
backflow prevention assembly laboratory and field evaluation capabilities.
BACKFLOW
A flow reversal (i.e., backpressure or backsiphonage) of
a contaminate, pollutant or water from an unapproved supply into the
distribution pipes of a potable water system.
(1)
BACKPRESSUREA form of backflow due to an elevated pressure (by pump, elevation of system piping, steam and/or air pressure) which creates a flow reversal into the distribution pipes of a potable water system.
(2)
BACKSIPHONAGEA form of backflow due to a reduction in pressure (i.e., a negative or subatmospheric pressure) which creates a flow reversal into the distribution pipes of a potable water system.
BACKFLOW PREVENTION ASSEMBLY OR PHYSICAL SEPARATION, APPROVED
A backflow prevention assembly of a make, model, size and
type approved for use or a physical separation which satisfies the
criteria set forth herein for an air-gap separation.
(1)
AIR-GAP SEPARATIONThe unobstructed vertical distance through the free atmosphere between the lowest free flowing outlet from a potable water system and the flood level rim of a tank, plumbing fixture, receptor or other device. An "approved air-gap separation" shall be at least the diameter of the outlet measured vertically above the flood level rim of the receptacle, but in no case less than one inch (2.54 cm). An air-gap separation shall be used to provide protection against a contamination hazard.
(2)
REDUCED-PRESSURE PRINCIPLE BACKFLOW PREVENTION ASSEMBLY (RPBA)An assembly of two independently operating approved check valves together with a hydraulically operating, mechanically independent differential pressure relief valve located between the check valves. The assembly shall include tightly closing (resilient seat) shutoff valves at each and must have properly located test cocks. To be approved these assemblies must be installed as prescribed within the "Manual of Procedures" and be readily accessible for in-line testing and maintenance. A reduced-pressure principle backflow prevention assembly shall be used to provide protection against a contamination hazard.
(3)
DOUBLE-CHECK VALVE ASSEMBLY (DCVA)An assembly of two independently operating approved check valves. The assembly shall include tightly closing (resilient seat) shutoff valves at each end and must have properly located test cocks. To be approved these assemblies must be installed as prescribed within the "Manual of Procedures" and be readily accessible for in-line testing and maintenance. A double-check valve assembly shall be used to provide protection against a pollution hazard.
(4)
PRESSURE VACUUM BREAKER (PVB)An assembly containing independently operating spring loaded check valve(s) and an independently operating spring loaded air inlet valve located on the discharge side of the check valve. The assembly shall include tightly closing (resilient seat) shutoff valves located at each end and must have properly located test cocks. To be approved these assemblies must be installed as prescribed within the "Manual of Procedures" and be readily accessible for in-line testing and maintenance. A pressure vacuum breaker shall be used to provide protection against a contamination hazard under backsiphonage conditions only.
(5)
ATMOSPHERIC VACUUM BREAKER (AVB)An assembly containing a float-check, a check seat and an air inlet port. The assembly shall include a tightly closing (resilient seat) shutoff valve immediately upstream of the valve body. To be approved these assemblies must be installed as prescribed within the "Manual of Procedures" and be readily accessible for in-line maintenance. An atmospheric vacuum breaker shall be used to provide protection against a contamination hazard under backsiphonage conditions only.
CERTIFIED BACKFLOW PREVENTION ASSEMBLY TESTER
A person certified and competent in the testing, repair and
maintenance of backflow prevention assemblies by successful completion
of the written and performance examination administered as part of
a training and certification course approved by the appropriate authority.
To be recognized each certified backflow prevention assembly tester
shall furnish evidence of competence in all phases of backflow prevention
assembly testing and repair, by means of examination and education
or by means of examination and experience, to the Water Department.
A valid certification, issued in accordance with the requirement of
this section, which has not exceeded three years from the date of
issuance shall be evidence of competence. Each certified backflow
prevention assembly tester shall be cognizant of all applicable laws,
rules, regulations, reporting and recordkeeping requirements.
CONSUMER
Any person who is served by the municipal water system and/or
is assessed charges for water service from the municipal water system
by the City of Las Vegas.
CONTAMINATION
An impairment of potable water quality (by sewage, industrial
fluids, waste liquids, gases, or other substances) to a degree which
creates an actual hazard to public health.
CROSS-CONNECTION
Any unprotected actual or potential connection or structural
arrangement between the municipal water system or the consumer's potable
water system and any other source or system by which it is possible
to introduce a contaminant, pollutant, used water, industrial fluid,
gas, or other substance into a potable water system. Bypass arrangements,
jumper connections, removable sections, swivel or change-over devices
and other temporary or permanent devices through which, or because
of which, backflow can or may occur are considered to be cross-connections.
(1)
CROSS-CONNECTION CONTROL BY CONTAINMENTThe installation of an approved backflow prevention assembly or physical separation at the water service connection to a consumer's water system in instances where unprotected cross-connections within a consumer's premises pose a threat of contamination or pollution to the municipal water system. This type of protection may also be prescribed where it is physically or economically infeasible to find and permanently eliminate or control all actual or potential cross-connection within the consumer's water system. Containment control for residential application shall be accomplished with a dual check valve at the service connection.
(2)
CROSS-CONNECTION CONTROL BY ISOLATIONThe installation of an approved backflow prevention assembly or physical separation within the consumer's water system to effectively isolate that portion of the consumer's water system where unprotected cross-connections occur. This type of protection may also be prescribed where it is physically or economically infeasible to find and permanently eliminate or control all actual or potential cross-connections within a portion of the consumer's water system.
(3)
CROSS-CONNECTION, POTENTIALA connection or structural arrangement between the municipal water system or the consumer's potable water system and any other source or system through which backflow into potable water system may occur as the result of intermittent conditions.
(4)
CROSS-CONNECTION, PROTECTEDA cross-connection which has been protected (controlled) with an approved backflow prevention assembly or physical separation.
(5)
CROSS-CONNECTION, UNPROTECTEDA cross-connection which has not been protected (controlled) with an approved backflow prevention assembly or physical separation.
CUSTOMER'S SYSTEM OPERATOR
The consumer or the consumer's contact person who has knowledge
of the backflow preventers located on the premises.
HAZARD, DEGREE OF
The condition of risk created by an actual or potential threat
of contamination or pollution resulting from a cross-connection.
(1)
HAZARD, CONTAMINATIONAn actual or potential threat of contamination, of a biological, physical or toxic nature, to the municipal water system or the consumer's potable water system to a degree which creates a hazard to public health.
(2)
HAZARD, PLUMBINGAn internal or plumbing type cross-connection within a consumer's potable water system that may be a contamination or a pollutional hazard. This includes, but is not limited to, cross-connections to toilets, sinks, lavatories, wash trays, domestic washing machines and lawn sprinkling system. Such cross-connections must be protected with approved backflow prevention assembly(ies) or physical separation(s).
(3)
HAZARD, POLLUTIONALAn actual or potential threat of pollution to the municipal water system, or the consumer's potable water system, which would not create a hazard to public health.
(4)
HAZARD, SYSTEMAn actual or potential threat of severe damage to the physical properties of the municipal water system or the consumer's potable water system, or an actual or potential threat of pollution or contamination which would have a protracted effect upon the potable quality of the water in either system.
HEARING OFFICER
The person designated by the City Manager and authorized
to conduct hearings as provided within this section, subject to the
rules and regulations established by City of Las Vegas.
INDUSTRIAL FLUID
Any chemically, biologically or otherwise contaminated fluid
or solution in a form or concentration which would constitute a contamination
or pollutional hazard if introduced into the municipal water system
or the consumer's potable water system.
MANUAL OF PROCEDURES
A manual of procedures for implementation of the City of
Las Vegas Cross-Connection Prevention Program to include standardized
backflow prevention assembly installation criteria for the protection
of the municipal water system. The "Manual of Procedures" shall be
published by the Water Department.
PERSON
Any individual, partnership, firm, public company, private
corporation, association, trust, estate, government entity, or any
other legal entity or their legal representatives, agents or assigns.
This term means either the singular or plural, as the case may be.
POLLUTION
An impairment of potable water quality to a degree which
does not create a hazard to public health, but does render such water
unsuitable for other domestic uses.
PREMISES
A parcel of real estate or portion thereof, including any
improvements or structures thereon.
RESPONSIBILITY
It shall be the responsibility of the City's Water Director
to administer and enforce the provisions of this section. This section
also assigns responsibilities to customers and to certified backflow
prevention assembly testers and repairmen.
SERVICE CONNECTION
The terminal end of a water service from the municipal water
system (i.e., the downstream end of the water meter) to a consumer's
water system. Service connection also means any temporary or emergency
water service from the municipal water system.
WATER DEPARTMENT
Has the responsibility and authority to operate and maintain
the municipal water system.
WATER SUPPLY, APPROVED
Public water system and any other water sources regulated
by the New Mexico Health and Environment Department, Environmental
Improvement Division.
WATER SUPPLY, AUXILIARY
Any public or private water supply (including community and
noncommunity water systems, as further defined within the New Mexico
Regulations Governing Water Supplies) on or available to a consumer's
premises, other than the City of Las Vegas municipal water system.
Auxiliary water supplies may include public potable water suppliers,
any natural water sources (such as wells, springs, rivers, or streams),
used waters or industrial fluids.
WATER SYSTEM, CONSUMER'S
The privately owned water system on a consumer's premises
whether supplied by the municipal water system or an auxiliary water
source. Where the consumer's water system is supplied by the municipal
water system, the point of beginning of the consumer's water system
shall be the service connection.
WATER SYSTEM, MUNICIPAL
Any potable water system which is owned and operated by the
City of Las Vegas to supply residential and nonresidential water uses
within and beyond the municipal limits of the City of Las Vegas. This
water system includes all sources, facilities and appurtenances between
the source and the service connection (water meter) such as valves,
pumps, pipes, conduits, reservoirs, storage tanks, fixtures, equipment
and appurtenances used to produce, convey, treat or store potable
water.
WATER SYSTEM, NONPOTABLE
A water system that contains water which exceeds the maximum
contaminant levels specified by the New Mexico Regulations Governing
Water Supplies and/or Public Law 93-523 (the Safe Drinking Water Act
and subsequent amendments).
WATER SYSTEM, POTABLE
A water system that contains water which does not exceed
the maximum contaminant levels specified by the New Mexico Regulations
Governing Water Supplies and/or Public Law 93-523 (the Safe Drinking
Water Act and subsequent amendments).
WATER SYSTEM, PRIVATE
Any water system for the provision of piped water for human
consumption or domestic purposes, if such system does not have more
than 15 service connections or does not regularly serve an average
or more than 25 individuals at least 60 days during the year.
WATER SYSTEM, PUBLIC
A water system, other then the municipal water system, for
the provision of piped water for human consumption to the public,
if such system has at least 15 service connections or regularly services
an average of at least 25 individuals at least 60 days out of the
year. A public water system is either a community water system or
a noncommunity water system (as further defined within the New Mexico
Regulations Governing Water Supplies).
WATER, USED
Any water supplied from the municipal water system to a consumer's
water system after it has passed through the service connection and
is no longer under the sanitary control of the Water Department.