HomeMy WebLinkAboutOrdinances (O-98-1133)-01/05/1998
ORDINANCE 0-98-1133
AN ORDINANCE AMENDING APPENDIX A, WATER AND SEWER POLICY AND
PROCEDURE MANUAL OF THE COLLEYVILLE CODE BY ESTABLISHING
RULES AND REGULATIONS GOVERNING THE USE AND INSTALLATION OF
CROSS CONNECTION CONTROL DEVICES, SETTING UP A SYSTEM OF
CUSTOMER SERVICE INSPECTIONS, IDENTIFYING THE REQUIREMENTS FOR
CERTIFICATION AS A CROSS CONNECTION CONTROL INSPECTOR AND
BACKFLOW PREVENTION ASSEMBLY TESTER, PROVIDING FOR THE
ENFORCEMENT OF THIS ORDINANCE, AND SETTING PENALTIES.
WHEREAS, the City of Colleyville desires to identify, eliminate, and/or control
cross-connections between the potable water supply and any pipe or vessel
that may contain a contaminant or pollutant, and
WHEREAS, the Environmental Protection Agency (EPA) mandates that all
suppliers of drinking water provide and maintain clean, safe drinking water,
and
WHEREAS, Title 30, Texas Administrative Code, Sections 290.44 and 290.46,
mandate that each city protect its drinking water supply by instituting and
enforcing a cross-connection program.
NOW THEREFORE, BE IT ORDAINED BY THE CITY COUNCIL OF THE CITY OF
COLLEYVILLE, TEXAS:
Seco 1.
THAT Appendix A, Water and Sewer Policy and Procedure Manual,
of the Colleyville Code be amended by adding Seco T, Cross
Connection Control Ordinance, as follows:
CROSS CONNECTION CONTROL ORDINANCE
CITY OF COLLEYVILLE
Contents:
Part 1 1 :01 Definitions
1 :02 Purpose
1 :03 Sackflow Prevention Assembly Requirements
1 :04 Mobile Units
1 :05 Multiple Service Connections
1 :06 Plumbing Code
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1 :07 Thermal Expansion
1 :08 Pressure Loss
1 :09 Residential Service Connections
Part 2 2:01 Customer Service Inspection
Part 3 3:01 Certification of Cross Connection Inspectors
3:02 Certification of Backflow Prevention Assembly Testers
Part 4 4:01 Certified Backflow Prevention Assembly Tester
Responsibilities
Part 5 5:01 Cost of Compliance
Part 6 Assembly Requirements
6:01 Testing of Assemblies
6:02 Maintenance of Assemblies
6:03 Installation Requirements
Part 7 Installation Standards and Specifications
7:01 Reduced Pressure Principle Backflow Prevention
Assembly
7:02 Double Check Valve Backflow Prevention Assembly
7:03 Double Detector Check Valve Assembly
7:04 Pressure Vacuum Breaker Assembly
7:05 Atmospheric Vacuum Breaker
7:06 Air Gap Separation
Part 8 8:01 Responsibilities of Owners and Renters
Part 9 9:01 Access to Premises
Part 10 10:01 Right-of-Way Encroachment
Part 11 11 :01 Enforcement and Penalties
11 :02 Emergency Suspension of Utility Service
11 :03 Non-Emergency Termination of Water Supply
Part 12 12:01 Constitutionality and Saving Clause
Part 13 13:01 Effective Date
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PART 1
1 :01 DEFINITIONS
For the purpose of this Ordinance, the following definitions shall apply unless
the context clearly indicates or requires a different meaningo If a word or term
used in this Ordinance is not contained in the following list, its definition, or other
technical terms used, shall have the meanings or definitions listed in the latest
edition of the Manual of Cross Connection Control published by the Foundation
for Cross Connection Control and Hydraulic Research, University of Southern
Californiao
(1) "Approved backflow prevention assembly" or "backflow assembly" or
"assembly" means an assembly to counteract backpressures or prevent
backsiphonageo This assembly must appear on the list of approved
assemblies issued by USC Foundation for Cross-Connection Control and
Hydraulic Researcho
(2) "Auxiliary supply" means any water source or system other than the public
water system that may be available in the building or on the property.
(3) "Backflow" means the flow in the direction opposite to the normal flow or
the introduction of any foreign liquids, gases, or substances into the water
system of the City's watero
(4) "Boresight" or "boresight to daylight" means providing adequate drainage
for backflow prevention assemblies installed in vaults through the use of
an unobstructed drainpipeo
(5) "City" means City of Colleyvilleo
(6) "Contamination" means the entry into or presence in a public water supply
system of any substance that may be deleterious to health and/or quality
of the watero
(7) "Cross connection" means any physical arrangement where a potable
water supply is connected, directly or indirectly (actual or potential), with
any other non-drinkable water system, used water system or auxiliary
water supply, sewer, drain conduit, swimming pool, storage reservoir,
plumbing fixture, swamp coolers, air conditioner units, fire protection
system, or any other assembly which contains, or may contain,
contaminated water, sewage, or other liquid of unknown or unsafe quality
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which may be capable of imparting contamination to the public water
system as a result of backflow. Bypass arrangements, jumper
connections, removable sections, swivel or change over assemblies, or
other temporary or permanent assemblies through which, or because of
which, backflow may occur are considered to be cross connections.
(8) "Customer Service Inspector" or "CSI" is an individual who has fulfilled the
requirements set out in TNRCC Rules and Regulations for Public Water
Systems, paragraph 290.46U)(1)0
(9) "Degree of hazard" means the low or high hazard classification that shall
be attached to all actual or potential cross connectionso
(10) "Double check valve backflow prevention assembly" or "double check
assembly" or "double check" means an assembly, which consists of two
independently operating check valves, which are spring-loaded or
weightedo The assembly comes complete with a gate valve on each side
of the checks, as well as test cocks to test the checks for tightness.
(11) "Health hazard" means an actual or potential threat of contamination of a
physical or toxic nature to the public potable water system or the
consumer's potable water system that would be a danger to health.
(12) "High hazard" means the classification assigned to an actual or potential
cross connection that potentially could allow a substance that may cause
illness or death to backflow into the potable water supplyo
(13) "Inspector" means a person that is a certified inspector recognized by the
City of Fort Worth and registered with the City of Colleyville and has
satisfied TNRCC regulations for CSI.
(14) "Low hazard" means the classification assigned to an actual or potential
cross connection that potentially could allow a substance that may be
objectionable but not hazardous to one's health to backflow into the
potable water supplyo
(15) "Material improvement" means any plumbing work done within a facility
that requires a plumbing permit.
(16) "Plumbing hazard" means an internal or plumbing-type cross-connection
in a consumer's potable water system that may be either a pollution or a
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(17)
(18)
(19)
(20)
(21 )
(22)
I (23)
contamination-type hazardo
"Point-of-use isolation" means the appropriate backflow prevention within
the consumer's water system at the point at which the actual or potential
cross connection exists.
"Poly tonal hazard" means an actual or potential threat to the physical
properties of the water system or the potability of the public or the
consumer's potable water system but which would not constitute a health
or system hazard, as defined. The maximum degree of intensity of
pollution to which the potable water system could be degraded under this
definition would cause a nuisance or be aesthetically objectionable or
could cause minor damage to the system or its appurtenanceso
"Potable water supply" means any water supply intended or used for
human consumption or other domestic useo
"Premises" means any piece of property to which water is provided,
including all improvements, mobile structures, and structures located on
it.
"Premises isolation" means the appropriate backflow prevention at the
service connection between the public water system and the water user.
"Public water system" or "system" means any public or privately owned
water system that supplies water for public domestic use. The system
must meet all the health requirements set forth by the TNRCCo The
system will include all services, reservoirs, facilities, and any equipment
used in the process of producing, treating, storing or conveying water for
public consumptiono
"Reduced pressure principle backflow prevention assembly" or "reduced
pressure principle assembly" or "RP assembly" or "RP" shall mean an
assembly containing two independently acting approved check valves
together with a hydraulically-operated, mechanically independent
pressure differential relief valve located between the check valves and at
the same time below the first check valveo The assembly shall include
properly located test cocks and tightly closing shut-off valves at the end of
the assembly.
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(24) "Residential use" shall include single family dwellings, duplexes, multiplex
housing and apartments where the individual units are each on a
separate meter; or, in cases where two or more units are served by one
meter, the units are full-time dwellings.
(25) "Non-residential use" shall include all uses not specifically included in
"residential uses" defined aboveo
(26) "Service connection" is the point of delivery at which the water purveyor
loses control of the watero
(27) "System hazard" means an actual or potential threat of severe danger to
the physical properties of the public or consumer's potable water supply
or of a pollution or contamination that would have a detrimental effect on
the quality of the potable water in the system.
(28) "Tester" means a person that has met all TNRCC requirements to be a
certified backflow prevention assembly techniciano
(29) "Thermal expansion" means heated water that does not have the space to
expand.
(30) "TNRCC" means Texas Natural Resource Conservation Commission.
(31) "Used water" means water supplied by a public water system to a water
user's system after it has passed through the service connection.
1 :02 PURPOSE
Pursuant to Title 30, Texas Administrative Code, Section 290.44 and 290.46, it
is the responsibility of the City of Colleyville to protect its drinking water supply
by instituting and enforcing a cross connection programo The purpose of this
Ordinance, therefore, is to comply with the above-cited regulatory requirements
and to protect the water supply of the City of Colleyville from contamination or
pollution due to any cross connections.
1 :03 BACKFLOW PREVENTION ASSEMBLY REQUIREMENTS
A certified cross connection inspector employed by or under contract with the
City shall determine the type and location of backflow assembly to be installed
within the City's water service area. The assembly will be required in each of the
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following circumstances, but the inspector is in no way limited to the following
circumstances:
(1) When the nature and extent of any activity at a premises, or the materials
used in connection with any activity at a premises, or materials stored at a
premises, could contaminate or pollute the potable water supply.
(2) When a premises has one or more cross connections as that term is
defined in Section 1 :01, paragraph (7)0
(3) When internal cross connections are present that are not correctableo
(4) When intricate plumbing arrangements are present that make it
impractical to ascertain whether cross connections exist.
(5) When a premises has a repeated history of cross connections being
established or re-establishedo
(6) When entry to a premises is unduly restricted so that inspections for cross
connections cannot be made with sufficient frequency to assure that cross
connections do not exist.
(7) When materials are being used such that, if backflow should occur, a
health hazard could result.
(8) When installation of an approved backflow prevention assembly is
deemed by an Inspector to be necessary to accomplish the purpose of
these regulationso
I (9) When an appropriate cross connection survey report form has not been
filed with the City Manager or his designee.
(10) In all new nonresidential construction there shall be installed an approved
backflow assembly at the service connectiono The type of the assembly
will be commensurate with the degree of hazard as determined by an
Inspectoro
(11) When a building is constructed on commercial premises, and the end use
of such building is not determined or could change, a reduced pressure
principle backflow prevention assembly shall be installed at the service
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(12)
(13)
(14)
(15)
(16)
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connection to provide protection of the public water supply in the event of
the most hazardous use of the buildingo
Any used water return system that has received approval from the City
Manager or his designeeo
If a point-of-use assembly has not been tested or repaired as required by
this Ordinance, a premises isolation assembly shall be required.
If an Inspector determines that additions or rearrangements have been
made to the plumbing system without the proper permits as required by
the Plumbing Code, premise isolation shall be required.
All multistory commercial, industrial, or multidwelling buildings or any
building with a booster pump or elevated storage tanko
Retrofitting shall be required on all high hazard connections and wherever
else the City Manager or his designee deems retrofitting necessary.
An approved double detector check valve assembly shall be the minimum
protection for all new fire sprinkler systems and on any existing system
where piping material is not approved for potable water use and/or that
does not provide for periodic flow-through during each 24 hour period
unless a variance has been issued in writing from the City Manager or his
designee. An RP assembly shall be installed if any solution other than
the potable water can be introduced into the sprinkler systemo
1 :04 MOBILE UNITS
(1 ) A person who owns or operates any vehicle that uses water from the
City's public water system shall obtain a use permit from the City Manager
or his designee before accessing the public water systemo The City
Manager or his designee may require a fixed air gap or backflow
assembly mounted either on the vehicle or piping or provide some means
of backflow protectiono
(2) The failure of the owner or operator of the vehicle to comply with this
Ordinance shall be grounds for the City to revoke any permit or license
required under the City Code to operate the vehicle or the business for
which such vehicle is usedo
(3) The City Manager or his designee may deny a use permit to any person
who is not in compliance with this Ordinance or who has a history of
violating the requirements of this Sectiono
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1 :05 MULTIPLE SERVICE CONNECTIONS
Any premises requiring multiple service connections for adequacy of supply
and/or fire protection shall have a backflow assembly on each service
connection. The assembly shall be commensurate with the degree of the
highest potential hazard.
1 :06 PLUMBING CODE
As a condition of water service, customers shall install, maintain, and operate
their piping and plumbing systems in accordance with the Plumbing Code. If
there is a conflict between this Ordinance and the Plumbing Code, the more
restrictive provision shall applyo
1 :07 THERMAL EXPANSION
It is the responsibility of the property owner to eliminate the possibility of thermal
expansion, if a closed system has been created by the installation of a backflow
assemblyo
1 :08 PRESSURE LOSS
Any water pressure drop caused by the installation of a backflow assembly shall
not be the responsibility of the Cityo The City may give reasonable assistance to
a property owner regarding information on adequate sizing of assemblies and
proper plumbing practices to provide for required pressure and flowo
1 :09 RESIDENTIAL SERVICE CONNECTIONS
Any residential property that has been determined to have an actual or potential
cross connection, shall be equipped with an approved backflow prevention
assembly installed in accordance with this Ordinanceo
PART 2
2:01 CUSTOMER SERVICE INSPECTION
(1) Pursuant to TNRCC Water System Regulations, the City, prior to
providing continuous water service in each of the following circumstances,
shall complete a customer service inspection for cross connection control:
(a) Water service to a newly constructed facility or previously non-
existing premises.
(b) After any material improvement to building(s) or premiseso
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(c) Any correction or addition to the plumbing of any facility or
premises served by the cityo
(d) The regulatory authority deems it necessary.
(2) Permanent water service shall not be supplied to a new construction
facility(s) until after the customer service inspection is completed.
PART 3
3:01 CERTIFICATION OF CROSS CONNECTION INSPECTORS
(1) Inspectors performing cross connection control duties within the City of
Colleyville must be approved by the City Manager or his designee and
shall meet the following requirements:
(a) Be employed by or under contract with the City of Colleyville;
(b) Attend a cross connection control inspector certification-training
course approved by the City of Colleyvilleo
3:02 CERTIFICATION OF BACKFLOW PREVENTION ASSEMBLY TESTERS
(1) All backflow assembly testers operating within the City shall be certified in
accordance with all applicable regulations of TNRCC and meet the
requirements of the City of Fort Worth. No person shall operate as a
backflow prevention assembly tester within the City without first being
an'"1ually registered by the City Manager or his designee.
(2) At the time of certification, recertification, and upon the City Manager or
his designee's request, each person certified as a backflow prevention
assembly tester shall furnish evidence to show that he/she is insured and
bonded to perform services on private property, and has current all
licenses required by the State of Texas and the City to perform the
contemplated serviceso
(3) Persons certified as backflow prevention assembly testers shall meet the
following requirements:
(a) Hold a TNRCC-approved certification;
(b) Meet the requirements of the City of Fort Wortho
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PART 4
4:01 CERTIFIED BACKFLOW PREVENTION ASSEMBLY TESTER
RESPONSIBILITIES
(1) No certified backflow assembly tester shall operate within the City without
first registering with the City Manager or his designeeo
(2) A registration shall remain in effect provided:
(a) The tester maintains eligibility for registration and
certification;
(b) The tester is currently registered with the City of Fort Worth;
(c) Registration is not revoked by the City Manager or his designee.
(3) Upon recertifying, a tester shall renew his/her registration with the City
Manager or his designee. If a certification remains expired for a period of
one year, the tester shall reestablish registration eligibilityo
(4) Each applicant for registration shall:
(a) Provide evidence that the applicant is registered with the City of
Fort Wortho
(b) Identify all test gauges the applicant will use in testing
backflow prevention assemblieso
(5) A registered tester must stay in compliance with all requirements of the
City of Fort Worth for certified and registered testerso
(6) After notice and hearing, the City Manager or his designee may revoke a
registration if the City Manager or his designee determines that the tester:
(a) Has made false, incomplete, or inaccurate assembly testing
reports;
(b) Has used inaccurate gauges;
(c) Has used improper testing procedures;
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(d) Has expired insurance;
(e) Is not in compliance with safety regulations;
(f) Has failed to register the serial numbers of his/her test kits or failed
to calibrate gauges annually;
(g) Has violated any other provision of this Section; or
(h) Has failed to comply with the requirements of the City of Fort Worth
or has been removed from the City of Fort Worth tester list.
PART 5
5:01 COST OF COMPLIANCE
The cost of complying with these regulations shall be the responsibility of the
property owners and their lesseeso These costs include but are not limited to
purchasing, installation, testing and repair of the assemblyo These costs shall
include point-of-use and premises isolation assemblies. Any cost incurred by
the City to enforce this Ordinance is the responsibility of the property owners
and their lesseeso
PART 6
ASSEMBLY REQUIREMENTS
6:01 TESTING OF ASSEMBLIES
(1 )
The City Manager or his designee will cause to be inspected and tested,
all assemblies in each of the following circumstances:
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(a) immediately after installation;
(b) a minimum of once a year for all reduced pressure principle
assemblies;
(c) a minimum of once a year for all double check assemblies installed
on commercial or industrial applications;
(d) immediately after repair;
(e) after assembly is moved.
Assemblies may be required to be tested more frequently if the City
Manager or his designee deems necessaryo
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(3) All assembly testing shall be performed in accordance with TNRCC-
approved test procedures by a certified and registered backflow
prevention assembly tester as specified in this Ordinance.
(4) All backflow assembly testers shall be registered with the City of
Colleyvilleo
(5) It is the responsibility of the property owner to have all assemblies tested
in accordance with this Ordinanceo
(6) The City shall not be liable for any damage to an assembly or any
property that may occur.
6:02 MAINTENANCE OF ASSEMBLIES
(1) A person who owns, operates, or manages premises in which required
backflow prevention assemblies are installed, shall maintain such
assemblies in proper working order at all times, including repair as
requiredo All maintenance and repair of assemblies shall be done in
accordance with all applicable regulations of the TNRCC and this
Ordinance.
(2) Backflow prevention assemblies shall be maintained in a manner that
allows them to be tested by a method that has been approved by TNRCC.
6:03 INSTALLATION REQUIREMENTS
Backflow prevention assemblies shall be installed in accordance with the
following requirements, to ensure their proper operation and accessibility:
(1) Backflow prevention assemblies shall be installed in accordance with the
Plumbing Code and this Ordinance. The assembly installer shall obtain
the required plumbing permits prior to installation and shall have the
assembly inspected by a certified cross connection inspector and as
required by the Plumbing Code.
(2) No part of a reduced pressure principal backflow prevention assembly
shall be submerged or installed in a location subject to flooding. If a
double check valve assembly is installed in a vault, brass plugs shall be
maintained in the test ports at all times and adequate drainage shall be
providedo
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(3) Assemblies shall be installed at the point of delivery of the water supply,
before any branch in the line, and on private property located just inside
the boundary of the City's right-of-wayo An Inspector may specify other
areas for installation of the assembly.
(4) The assembly shall be protected from freezing and other severe weather
conditionso
(5)
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(6)
(7)
(8)
(9)
(10)
(11 )
(12)
I (13)
All backflow prevention assemblies shall be of a type and model approved
by the City Manager or his designee.
All vertical installations shall be approved in writing by the City Manager
or his designee prior to installationo
The assembly shall be readily accessible with adequate room for
maintenance and testingo
If the City Manager or his designee grants written permission to install the
backflow assembly inside of a building, the assembly shall be readily
accessible between 8:00 a.m. and 5:00 pomo, Monday through Friday.
If an assembly is installed pursuant to subsection (1 )(h), and is four (4)
inches or larger and is installed five (5) feet or higher above the floor, it
shall be equipped with a rigidly and permanently installed scaffolding
acceptable to the City Manager or his designeeo This installation shall
also meet all applicable requirements set out by the UoSo Occupational
Safety and Health Administration and the State of Texas occupational
safety and health lawso
Upon completion of installation, the property owner shall notify the City
Manager or his designeeo The property owner shall register all backflow
assemblies with the City Manager or his designeeo Registration shall
consist of date of installation, manufacturer, model, serial number of the
backflow prevention assembly, and initial test reporto
Assemblies installed more than five (5) feet above floor level shall have a
suitable platform for use by testing or maintenance personnel.
Lines shall be thoroughly flushed prior to installation. A strainer with
blowout tapping may be required ahead of the assemblyo
The property owner assumes all responsibility for leaks and damageo The
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owner shall also see that any vault is kept reasonably free of silt and
debris.
PART 7
INSTALLATION STANDARDS AND SPECIFICATIONS
7:01 REDUCED PRESSURE PRINCIPLE BACKFLOW PREVENTION
ASSEMBLY (RP)
All RP assemblies will be tested in each of the following circumstances
immediately upon installation, after repair, and annually. (See Exhibit "A": Std.
Detail Noo 7:01-1, "Reduced Pressure Principal Large Assembly", Std. Detail No.
7:01-2, "Relief Valve Discharge Rates", Std. Detail No. 7:01-3, "Strainers", and
Stdo Detail No. 7:01-4, "Reduced Pressure Principal Small Assembly" .)
(1) RP's may be utilized at premises where a substance is handled that
would be hazardous to the public health if introduced into the potable
water systemo An RP is normally used in locations where an air gap is
impractical. An RP is effective against both backsiphonage and
backpressureo
(2) RP's shall be sized to provide an adequate supply of water and pressure
for the premises being served.
(3) Premises where non-interruption of water supply is critical shall be
provided with two assemblies of the same type installed in parallel. They
shall be sized in such a manner that either assembly will provide the
minimum water requirements while the two together will provide the
maximum flow requiredo
(4) Bypass lines are prohibited. Pipefittings that could be used for
connecting a bypass line shall not be installed.
(5) The assembly shall be readily accessible for testing and maintenance and
shall be located in an area where water damage to buildings or
furnishings will not occur from relief valve discharge. An approved air gap
funnel assembly may be used to direct minor discharges away from the
assembly; this assembly will not control flow in a continuous relief
situation. Drain lines to accommodate full relief valve discharge flow
should be consideredo
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(6) Enclosures shall be designed for ready access and sized to allow for the
minimum clearances established below. Daylight drain ports shall be
provided to accommodate full pressure discharge from the assembly.
(7) All assemblies larger than two (2) inches shall have a minimum of twelve
(12) inches on the back side, twenty-four (24) inches on the test cock
side, and the relief valve opening shall be at least twelve (12) inches plus
nominal size of assembly above the floor or highest possible water level.
Headroom of six (6) feet is required in vaults without a fully removable
topo A minimum access opening of twenty-four (24) inches square is
required on all vault lids. All assemblies two (2) inches and smaller shall
have at least a six (6) inch clearance on all sides.
(8) All RP assemblies shall be tested in accordance with this Ordinance.
(9) Variances from these specifications will be evaluated on a case-by-case
basiso Any deviations shall be prohibited without prior written approval of
the City Manager or his designeeo
(10) RP assemblies may be installed in a vault only if relief valve discharge
can be drained to daylight through a boresight type drain. The drain shall
be of adequate capacity to carry the full rated flow of the assembly and
shall be screened on both ends.
(11) An approved air gap shall be located at the relief valve orifice of RP
assemblieso This air gap shall be at least twice the inside diameter of the
incoming supply line as measured vertically above the top rim of the drain
and in no case less than one (1) incho
7:02 DOUBLE CHECK VALVE BACKFLOW PREVENTION ASSEMBLY (DC)
(See Exhibit "B": Stdo Detail Noo 7:02-1, "Double Check Valve Large Assembly",
and Stdo Detail Noo 7:02-2, "Double Check Valve Small Assembly.")
(1) Double check valve assemblies may be utilized at premises where a
substance is handled that would be objectionable but not hazardous to
health if introduced into the potable water systemo
(2) DCs shall be sized to provid~ an adequate supply of water and pressure
for the premises being servedo
(3) Premises where non-interruption of water supply is critical shall be
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provided with two assemblies of the same type installed in parallel. They
shall be sized in such a manner that either assembly will provide the
minimum water requirements while the two together will provide the
maximum flow requiredo
(4) Bypass lines are prohibitedo Pipefittings that could be used for
connecting a bypass line shall not be installed.
(5) The assembly shall be readily accessible with adequate room for testing
and maintenance. DCs may be installed below grade, providing all test
cocks are fitted with brass pipe plugso All vaults shall be well drained,
constructed of suitable materials, and sized to allow for the minimum
clearances established below.
(6) Assemblies two (2) inches and smaller shall have at least a three (3) -inch
clearance below and on both sides of the assembly, and if located in a
vault, the bottom of the assembly shall be not more than twenty-four (24)
inches below gradeo All assemblies larger than two (2) inches shall have
a minimum clearance of twelve (12) inches on the back side, twenty-four
(24) inches on the test cock side, and twelve (12) inches below the
assembly. Headroom of six (6) feet is required in vaults without a fully
removable topo A minimum access opening of twenty-four (24) inches
square is required on all vault lidso
(7) Vertical installations are allowed on sizes up to and including four (4)
inches that meet the following requirements:
(a) Internally spring-loaded check valves;
(b) Flow is upward through assembly;
(c) Manufacturer states their assembly can be used in a vertical
position; and
(d) Approved by the City Manager or his designee.
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(8) All DCs shall be tested in accordance with this Ordinance.
(9) Variances from these specifications will be evaluated on a case-by-case
basiso No deviations shall be permitted without prior written approval of
the City Manager or his designeeo
7:03 DOUBLE DETECTOR CHECK VALVE ASSEMBLY (DDC)
Double detector check valve assemblies may be utilized in all installations
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Page 18 of 34
requiring a double check valve assembly and detector meteringo DOCs shall
comply with the installation requirements applicable for double check valve
assemblies (DCs)o (See Exhibit "C": Standard Detail No. 7:03-1, "Double Check
Detector Assembly.")
7:04 PRESSURE VACUUM BREAKER ASSEMBLY (PVB)
(See Exhibit "D": Standard Detail No. 7:04-1, "Pressure Vacuum Breaker.")
(1) PVBs may be utilized at point-of-use protection only and where a
substance is handled that would be objectionable but not hazardous to
health if introduced into the potable water system. PVBs protect against
backsiphonage only and shall not be installed where there is potential for
backpressureo
(2) The assembly shall be installed a minimum of twelve (12) inches above
the highest use outlet or overflow level downstream from the assembly.
(3) PVBs shall not be installed in an area subject to flooding or where
damage would occur from water discharge.
(4) The assembly shall be readily accessible for testing and maintenance,
with a minimum clearance of twelve (12) inches all around the assembly.
(5) PVBs shall be located between twelve (12) inches and sixty (60) inches
above ground level.
(6) A strainer with blowout tapping may be required ahead of the assembly.
(7) All PVBs must be tested in compliance with this Ordinanceo
(8) Variances from these specifications will be evaluated on a case by case
basis. No deviations shall be permitted without prior written approval of
the City Manager or his designee.
7:05 ATMOSPHERIC VACUUM BREAKER (AVB)
(See Exhibit "E": Standard Detail Noo 7:05-1, "Atmospheric Vacuum Breaker.")
I (1)
I
______1_
AVB's provide minimal protection and are approved for very low hazard
application onlyo AVBs protect against backsiphonage only and are
prohibited where there is potential for backpressure.
Ordinance 0-98-1133
Page 19 of 34
(2) The assembly shall be installed a minimum of six (6) inches above the
highest use outlet or overflow level downstream from the assemblyo
(3) Shutoff valves downstream from the assembly are prohibited.
(4) AVB's shall be allowed only for those applications where there is less
than twelve (12) hours per day continuous useo
(5) AVB's shall not be installed in an area subject to flooding or where
damage may occur from water dischargeo
(6) AVB's shall be allowed for point-of-use protection only in accordance with
the Plumbing Codeo AVB's are not recognized as adequate protection by
the City Manager or their designee, so additional protection may be
required.
7:06 AIR GAP SEPARATION
(See Exhibit "F": Standard Detail No. 7:06-1, "Air Gap Separationo")
(1) Air gap separations provide maximum protection from backflow hazards
and may be utilized at premises where a substance is handled that would
be hazardous to health if introduced into the potable water systemo
(2) An air gap separation shall be at least twice the diameter of the supply
pipeline measured vertically above the top rim of the receiving vessel in
no case less than one (1) incho If splashing is a problem, tubular screens
may be attached or the supply line may be cut at a 450 angleo The air gap
distance is measured from the bottom of the angle. Hoses shall not be
allowed.
(3) Air gap separations shall not be altered in any way and shall be available
for inspection at all reasonable timeso
(4) Sidewalls, ribs or similar obstructions do not affect air gaps when spaced
from the inside edge of the spout opening a distance greater than three
times the diameter of the effective opening for a single, or a distance
greater than four times the effective opening for two intersecting walls.
(5) In cases where there are three or more sidewalls, ribs or similar
obstructions extending from the water surface to or above the horizontal
plane of the spout opening other than as specified in paragraph (4)
Ordinance 0-98-1133
Page 20 of 34
above, the air gap shall be measured from the top of the wall.
(6) The effective opening shall be the minimum cross-sectional area at the
seat of the control valve or the supply pipe or tubing which feeds the
assembly or outlet. If two or more lines supply one outlet, the effective
opening shall be the sum of the cross-sectional areas of the individual
supply lines or the area of the single outlet, whichever is smallero
PART 8
8:01 RESPONSIBILITIES OF OWNERS AND RENTERS
It is the responsibility of all property owners and lessees to abide by the
conditions of this Ordinance. The owner of leased or rented premises is
responsible for the installation, testing and repair of all backflow assemblies on
the premises.
PART 9
9:01 ACCESS TO PREMISES
(1) Every person provided water service by the City directly or indirectly shall,
during the hours of 8:00 a.mo through 5:00 p.m., permit the City Manager,
or his designee, to enter their premises and buildings for the purpose of
inspecting pipes and fixtures and the manner in which the water is used to
determine compliance with this Ordinanceo
(2) If any water user refuses access to their premises for inspection by an
Inspector, the water user shall install a reduced pressure principle
assembly at the service connection to the premiseso
(3) Any temporary or permanent obstruction to safe and easy access to the
premises to be inspected shall be promptly removed by the water user at
the written or verbal request of the City Manager or his designee and
shall not be replaced. The costs of clearing such access shall be borne
by the usero
PART 10
10:01 RIGHT-OF-WAY ENCROACHMENT
(1) No person shall install or maintain a backflow prevention assembly upon
\.
Ordinance 0-98-1133
Page 21 of 34
or within any City right-of-way except as provided by this Section.
(2) No encroachment agreement as required by the "Buildings" Chapter of
the City Code will be necessary, but all other permits required by the City
Code to perform work in the right-of-way shall be obtained.
(3) A backflow prevention assembly required by this Ordinance may be
installed upon or within any City right-of-way only if the owner proves to
the City that there is no other feasible location for installing the assembly,
and installing it in the right-of-way will not interfere with traffic or utilities.
The City retains the right to approve the location, height, depth,
enclosure, and other requisites of the assembly prior to its installation.
(4) Any assembly or portion of an assembly, which extends above ground
shall be located no closer than eighteen (18) inches to the face of the
curbo
(5) A property owner shall, at the request of the City and at the owner's sole
expense, relocate a backflow prevention assembly which encroaches
upon any City right-of-way when such relocation is necessary for street or
utility construction or repairs or for purposes of public safety.
PART 11
11 :01 ENFORCEMENT AND PENALTIES
(1 )
I
II
II (2)
I
II
(3)
II
II
L_
The City Manager or his designee and the City Attorney, and each of
them, are hereby authorized to enforce the provision of this Ordinance by
anyone or more of the enforcement mechanisms set forth in this
Ordinanceo
The inspectors, agents or representatives of the City charged with
enforcement of this Ordinance shall be deemed to be performing a
governmental function for the benefit of the general public and neither the
City, the City Manager or his designee, nor the individual inspector,
agent, or representative of the City engaged in inspection or endorsement
activities under this Ordinance when acting in good faith and without
malice shall ever be held liable for any loss or damage, whether real or
asserted, caused, or alleged to have been caused, as a result of the
performance of such governmental functiono
Failure on the part of any customer to discontinue the use of all cross
Ordinance 0-98-1133
Page 22 of 34
connections and to physically separate cross connections is sufficient
cause for the immediate discontinuance of public water service to the
premiseso
11 :02 EMERGENCY SUSPENSION OF UTILITY SERVICE
(1) The City Manager or his designee may, without prior notice, suspend
water service to any premises when such suspension is necessary to stop
an actual or threatened backflow which:
(a) presents or may present imminent and substantial danger to
the environment or to the health or welfare of persons; or
(b) presents or may present imminent and substantial danger to
the City's public water supplyo
(2) As soon as is practicable after the suspension of service, the City
Manager or his designee shall notify the owner or person in charge of the
premises of the suspension in person or by certified mail, return receipt
requested, and shall order such person to correct the cross connection
which allowed the backflow to occur. When time permits, the City
Manager or his designee should also notify the owner or person in charge
prior to suspending water serviceo
(3) If the person fails to comply with an order issued under subsection (2), the
City Manager or his designee may take such steps as the City Manager or
his designee deems necessary to prevent or minimize damage to the
public water supply or to minimize danger to persons.
(4) The City Manager or his designee shall not reinstate suspended services
until:
(a) The person presents proof, satisfactory to the City Manager
or his designee, that the backflow has been eliminated and
its cause determined and corrected;
(b) The person pays the City for all costs the City incurred in
responding to the backflow or threatened backflow; and
(c) The person pays the City for all costs the City will incur in
reinstating serviceo
Ordinance 0-98-1133
Page 23 of 34
(5) A person whose service has been suspended may appeal such
enforcement action to the City Manager or his designee, in writing, within
ten days of notice of the suspensiono
(6) A person commits an offense if the person reinstates water service to
premises suspended pursuant to this Section, without the prior approval
of the City Manager or his designeeo
(7) The City may obtain a lien against the property to recover its response,
abatement, and remediation costs.
(8) The remedies provided by this Section are in addition to any other
remedies set out in this Ordinanceo Exercise of this remedy shall not be a
bar against, or a prerequisite for, taking other action against a violator.
11 :03 NON-EMERGENCY TERMINATION OF WATER SUPPLY
(1) The City Manager or his designee may terminate the City-provided water
supply of any water user who violates the following conditions:
(a) Refusing the City Manager or his designee reasonable access to
the water user's premises for the purpose of inspection;
(b) Hindering or denying the City Manager or his designee access to
backflow prevention assemblies;
(c) Failing to install a reduced pressure principle assembly as required
by Part 9:010
(d) Failing to install and maintain backflow prevention assemblies in
compliance with this Ordinance; or
(e) Failing to install, maintain, and operate their piping and plumbing
systems in accordance with the Plumbing Codeo
(2)
The City Manager or his designee will notify a water user of the proposed
termination of its water supplyo The water user may petition the City
Manager or his designee for reconsideration and hearing within ten days
of termination of serviceo
(3)
I
Exercise of this enforcement option by the City Manager or his designee
shall not be a bar to, or a prerequisite for, taking any other action against
Ordinance 0-98-1133
Page 24 of 34
the water usero
(4) The City Manager or his designee shall not reinstate suspended services
until:
(a) The person presents proof, satisfactory to the City Manager or his
designee, that the backflow has been eliminated and its cause
determined and corrected; and
(b) The person pays the City for all costs the City will incur in
reinstating serviceo
PART 12
I 12:01 CONSTITUTIONALITY AND SAVING CLAUSE
i
I
I
I
I
I
I
That if any provision, section, sentence, clause or phrase of this Ordinance or
the application of same to any person or set of circumstances are for any reason
held to be unconstitutional, void, invalid or for any reason unenforceable, the
validity of the remaining portions of this Ordinance or its application to other
persons or circumstances shall not be affected thereby, it being the intent of the
City Council of the City of Colleyville in adopting and the Mayor in approving this
Ordinance that no portion hereof or provision or regulation contained herein
shall become inoperative or fail by reason of any unconstitutionality or invalidity
of any other portion I provision, or reQulationo
PART 13
13:01 EFFECTIVE DATE: This Ordinance shall be effective as of January 5,
19990
/)~
~ ~.F COLLEYVILLE
~ rL+-..
Richard Newton
Mayor
J .n Harris, TRMC, CMC
City Secretary
~ED
~ler
City Attorney
TO FORM AND LEGALITY:
... .....
. , .. . ...
.
.
Ladder
. .
TOP VIEW
Removable Access
Doar
r miD. when valve
is fully apen
.'
Shutoff
Valve
(2 req.)
DraiD
..
]- min
SIDE VIEW
REDUCED PRESSURE PRINCIPLE LARGE ASSEMBLY
Standard Detail No. 7:01-1
NOTES:
1) LARGE ASSEMBlIES ARE THOSE THAT ARE 2 %- AND LARGER.
2) ASSEMBLY StwJ. NOT BE SUBJECT TO FLOOOINGo
3) DRAIN UNES StwJ. BE SIZED TO ACCOMMODATE FULL REUEFVALVE DISCHARGE FlOW. SEE FLOW CHART 7:01-2
4) REDUCED PRESSURE BACKFLOW ASSEtlSLlES ARE TYPICALLY INSTALLED ABOVE GRADE IN WELL DRAINING
AAEAS. BUT MAY BE INSTALLED BELOW GRADE IF AN ADEQUATE DRAIN TO DAYLIGHT IS PROVIDED.
5) THE INSTALlATION ON THE SUPPLY LINE (AHEAD OF ASSEMBLY) OF A STRAINER WITH TAPPING BLOWOUT MAY
BE REaUIREOo SEE STANDARD DETAIL 7:01-3
Exhibit CI AU
Page 1014
- 125
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7 II h / TYPICAL FLOW RATES
1 AS SIZED BY FLOOR
I 1I 'I ~ V
/, , DRAIN MFG.
I ) (I ~ / 2" . 55 GPM
J 3" 112 GPM- -
I ~ /. '/' 4" 170 GPM
- -
/ / ~ ",./ ~ 7" 5" 350 GPM
/ 6" 450 GPM- -
I 7...... / /'
~ :;;.-~ 8" 760 GPM
150
o
o 100. 200 300 400 500 600 700 800 900
FLOW RATE (GPM)
RELIEF VALVE DISCHARGE RATES
FOR REDUCED PRESSURE BACKFLOW ASSalSLlES
Standard Detail 7:01-2
Exhibit" A"
Page Z of 4
STRAINERS
Standard Detail No. 7:01-3
One of the most common causes of backflow prevention assembly failure is the accumulation of sand,
scale, or debris trapped in the assembly. This debris can cause the assembly to fail its required testing and
can contribute to a shorter working life span of the assembly.
To minimize maintenance and repairs, it is recommended that a strainer with removable screen is installed
immediately upstream on the supply line of the assembly. Also. periodically remove and dean strainer
screens.
exhibit "A"
Page 3 of4
>
J
Go
D.
::I
on
. ....
. .
..
3-MI
ENCLosuRE WITH
REMOVABL! COVEA
.... .
..
.. .
REDUCED PRESSURE PRINCIPLE SMALL ASSEMBLY
Standard DetaO No. 7:01-4
NOTES:
1) ASSEMBLY MUST BE PROTECTED FROM FREEZlNGo
2) REMOVABLE INSUlATED COVERS CAN BE USED.
3) ENClOSURES MUST BE IN AREA NOT SUBJECT TO FLOODING.
4) THE INSTALlATION ON THE SUPPLY LINE (AHEAD OF ASSEMBLY) OF A STRAINER WITH TAPPING BLOWOUT IS
RECOMMENDEDo SEE STANDARD DETAIL NOo 7:01-3.
exhibit .1 A"
Page4of4
Ladder
..
. . ... ill .
. .
12 inch minimum
.................. .
... .... ... .. .. ~ . .
TOP VIEW 0
Removable Cover
24" opening
S utoff
valves
(2 req.)
SIDE VIEW
DOUBLE CHECK VALVE LARGE ASSEMBLY
Standard DetaR No. 7:02.1
NOTES:
1) LARGE ASSEMBLIES ARE THOSE THAT ARE 2 %" AND LARGER
2) VAULT INSTALLATIONS REQUIRE THE USE OF BRASS PIPE PlUGS IN ALL TEST COCKS.
3) THE INSTALLATION ON THE SUPPl V LINE (AHEAD OF ASSEMBLY) OF A STRAINER WITH TAPPING BLOWOUT W\V
BE REQUIRED. SEE STANDARD DETAIL NO. 7:02-3
Exhibit liS"
Page 1 of 2
TOP VIEW
SIDE VIEW
DOUBLE CHECK VALVE SMALL ASSEMBLY
Standard DetaO No. 7:02-2
NOTES:
1) ADEQUATE SPACE MUST BE ALLOWED FOR TESTING AND MAINTENANCE.
2) AREA AROUND ASSEPIa Y MUST DRAIN WELL.
3) VAUlT INSTALlATIONS REQUIRE THE USE OF BRASS PIPE PLUGS IN ALL TEST COCKS.
4) 'V' PAnERN ASSEMBUES MUST BE INSTALLED so THAT THE TEST COCKS ARE POINTED UP (SEE DRAWING
ABOVE).
5) THOROUGH.. Y FLUSH THE UNES PRIOR TO INSTALlATION OF THE ASSEMBLYo
6) STRAINERS ARE RECOMMENDED. SEE STANDARD DETAIL NO. 7:01-3.
Exhibit UB"
Page 20t 2
6-min.
\\JtI
FLOW
~
ATMOSPHERIC VACUUM BREAKER
Standard Detail No. 7:05-1
NOTES:
1) NO CONTROL VALVES OR SHUT -OFFS ALLOWED DOWNSTREAMo
2) INSTALL ASSEMBlY AT NO MORE THAN 60" ABOVE GROUND lEVEL
3) INSTALL ASSEMBlY AT L!AST 6" ABfNE HIGHEST DOWNSTREAM USE PIPING.
4) NO PUMPS OR BACKPRESSURE SOURCE ALLOWED.
5) NO CHEMICALADOITION INTO SYSTEM ALlOWED.
Exhibit "E-
Page 1 of 1
Potable
Water
Supply
o
1" MiniR'llm
2 x Diameter
.
AIR GAP SEPARATION
Standard DetaR No. 7:06-1
NOTES:
1) PROVIDES MAXIMUM PROTECTION.
2) THE VERTICAL. PHYSICAL SEPARATIONS WST BE AT lEAST TWICE THE DIAMETER OF THE INLET PIPE BUT
NEVER LESS THAN ONE INCH.
.. -
exhibit reF"
Page 1 of 1