NCS000422_Water Distribution Details and Standards Manual_20200218

TOWN OF BLACK MOUNTAIN WATER DISTRIBUTION DETAILS AND
STANDARDS MANUAL
DRAFT DOCUMENT
Introduction
Purpose
The Water Distribution Details and Standards establishes the minimum standard
for providing, extending, upgrading, replacing and maintaining the public water
distribution system owned, operated and maintained by the Town of Black
Mountain.
Scope
The guidelines contained within this section are aimed at providing the general
public, service providers, engineers and design community the minimum standards
and procedural requirements required to design, construct and convey new
extensions, replacements or upgrades to the public water distribution system.
Defmitions
As used in this Manual, unless the context shall otherwise require, the words and
phrases in this paragraph shall have the meanings herein defined:
1. Delegated Authority: The authority designated by the Public Water
Supply Section of the North Carolina Department of Environment and
Natural Resources pursuant to 15A NCAC 18C.0300 to approve plans
for construction of extensions and modifications of the Water
Distribution System. As of the date of adoption of this Manual, the
delegated authority is the Town of Black Mountain Public Works
Department.
2 Developer: The person, corporation, partnership, or other legal entity
who has overall responsibility for the extension or modification of the
Water Distribution System for the purpose of extending water to new
property for development.
3. Director: The Director of the Public Works Department of the Town of Black
Mountain.
4. Extensions: The addition of Water Distribution System facilities for the
purpose of providing accessibility of water and/or fire service to
additional property or upgrading the capa of water and/or fire service
to property already accessible foiservice.
5. Fire Department: The specific regularly organized fire department, fire
protection district, or fire company regularly charged with the
responsibility of providing fire protection to the jurisdiction within
which the specific area being served by the specific extension or
modification to the Water Distribution System is in question.

6. Fire Official: The officer or other designated authority, or his/her duly
authorized representative charged with the administration and
enforcement of the Fire Prevention Code, of the Fire Department.
7. Inspector: A construction inspector employed by the Water Resources
Public Works and assigned to make periodic observations of water
distribution system construction and to witness testing and disinfecting
processes.
8. Modifications: The replacement of Water Distribution System facilities
adjacent to property already accessible to water service to improve
reliabilityof service, reduce repair frequency and cost, reduce leakage,
increase residual pressure, or otherwise update or increase the assets of
the facilities for such service.
9. Repair: Work performed on the Water Distribution System to remedy a
break, defect, or leak and restore water service to conditions which
preceded the occurrence of the defect.
10. Service Line: The tap on a water main and extension of pipes from a
tap to a water meter (or two water meters in the case of a split
connection, to include the meter box, meter stop valve, meter yoke,
water meter, meter by-pass, dual check valve, and other pipe
accessories, for the purpose of providing service to a single property
(the service line on a split connection may serve two meters, each
serving a separate property, with these two properties adjacent to each
other).
11. Jechnical Specifications: The Town of Black Mountain Standard
Technical Specifications for Construction of the Extensions or
Modifications to the Water Distribution System, adopted separately
from this Manual, which govern the detailed specifications for
contracted construction of water facilities to meet these design
standards. , , - Commented PTt]: 777
12. Water Distribution System: All real and personal property owned, or to
be conveyed for Ownership, to the Town of Black Mountain as
facilities for the conveyance, transmission, or distribution of treated
drinking water which is operated and maintained by the Town of Black
Mountain Public Works Department, under the Water Policies.
13. Water Policies: The most recently adopted Town of Black Mountain
Public Works Department Policies.
14. Public Works Department: The Public Works Department of the Town of Black
Mountain.
15. Reference Material: Where not specified in this Manual, Water
Department Policies, technical specifications, town ordinances or the

North Carolina Administrative Code Title 15A, Subchapter 18C, to
protect the public health, safety and welfare, the Director of Public
Works Department will specify the standards to be applied to the
design and construction of public water system improvements and
may refer to other industry standards and references not listed herein.
PROCEDURES FOR EXTENDING WATER SYSTEM AND OBTAINING SERVICE:
All proposed and authorized new extensions or modifications to the Water
Distribution System shall conform to this Water Design and Construction Manual
and be constructed in accordance with the Technical Specifications and Standard
Details.
The following provides an outline and general information of the process for
extending the Water System to provide water service to one or more new properties.
Updated copies of necessary submittal forms and requirements are available on the
Town of Black Mountain website www.townofblackmountain.ore, Public Works
`x'^t ff De..aFt o^* Any questions concerning the process or requirements should
be addressed to the Public Works Director at [phone].
Stage L Water Availability / Letter of Commitment Application:
Submit applications, any applicable fees and sketch plans to the
appropriate department. Any water availability letter required for new
development will be initiated through the Planning & Development
Department upon receipt of permit applications. Infrastructure
improvements which do not require approval from Planning &
Development will be made directly to Public Works.
A. Letters of Commitment are required:
1. New construction — All Commercial
2. New construction - Single family residential, Duplex, Multi -family
3. Major Subdivision applications)
, - Commented [JT2]: we do require a letter for these
4. Whenever more than 4 meters are desired at a single location.
, , -
Commented PT3]: Jamey said they do not require a
5. l7or new subdivisions with more than 4 lots or
letter for this
whenever an extension of the water system is
- -
Commented [JT4]: This would be a major subdivision
required to serve the subdivision.
for us so we could strike this out and just leave it as
6. Whenever a single meter larger than 1-inch is required.
required for an extension of the water system
7. Whenever the required water service involves a fireline
connection and domestic water service of any size.L I
_ _
Commented PTS]: needs to be edited against our
_ _ _ _ _ _ _ _ _ _ _ _ _ _
_ _ _ _ _ _ _ __
development checklsits.
Commented PT6]: Jamey said they do not require a
letter for these

B. For commercial projects, a fixture unit analysis of the peak domestic
water demand shall be provided with the application, see the provided
resources in Figures W03-b through below. The sketch plan shall
indicate whether or not the project includes a fire sprinkler
connection.
Figure W02-b: DEMAND WEIGHT OF
FIXTURES IN FIXTURE UNIT
Fixture type
Weight in
fixture units
Bathtub
4
Bedpan washer
10
Bidet
4
Dental unit or cuspidor
1
Dental laboratory
2
Drinking fountain
2
Kitchen sink
4
Laboratory
2
Laundry tray (1 or 2 compartments)
4
Shower, each head
4
Sink: service
4
Urinal, pedestal
10
Urinal (wall lip)
5
Urinal stall
5
Urinal with flush tank
3
Urinal trough (for every 2 foot section)
2
Wash sink, circular or multiple (each set of faucets)
2
Water closet: F.V.
10
Water closet: tank
5
Figure W02-c: EXAMPLE - FIXTURE
UNITS AND ESTIMATED DEMANDS
Kind of
Fixtures
Building Supply
No. of
Fixtures
Fixture
Units
Demand
(gallons per
minute)
Water closets
130
1,300
Urinals
30
150
Shower heads
12
48
Laboratories
130
260
Service sinks
27
81
TOTAL
1,839
310
Stage II. Plans and Specifications Submittal and Review:

A. Plan Review Submittals:
1. General: All water main extensions shall be authorized by a valid
Letter of Commitment before the Watt Public Works will accept
engineering plans for review and approval. Proposed connections
to a dedicated fire -line do not require a Letter of Commitment but
do require plan review and approval by the W^*e Public Works.
Submit 2 sets of plans, Addendum to Engineer's Report,
Application for Approval, Data Sheets and Hydraulic Calculations
to the Public Works of the Public Works Department with the
required fee. Fire Sprinkler Plans will be required for all fire
protection service extensions.
2 Plan Requirements: All new extensions or modifications to the
Water Distribution System, except for service lines installed by the
Public Works Department, shall be provided on engineering plans
conforming to this Manual, sealed by a Registered Professional
Engineer, and approved by the Public Works Department, and by
the Delegated Authority of the North Carolina Department of
Environment and Natural Resources, if different from the Public
Works Department. Design shall further conform to all other
applicable federal, state, and local laws and regulations, and all
required permits shall be obtained prior to construction.
Plans shall consist of legible prints, shall not be greater than 24" X
36" in size, and to a scale no smaller than I " = 50'. Engineering
plans shall clearly show and label the proposed waterline extension,
all fittings and appurtenances, including restrained joint lengths,
service lines and water meter locations to be installed; existing
and/or proposed roads and road right-of-way; waterline easements;
lot lines; lot numbers; proposed location of all new underground
utilities within the same right-of-way as the proposed water system
improvements; topographic information, profile view to include
proposed final depth of bury of water mains and facilities, and
conflicts or crossings with other underground utilities; north arrow;
location map; applicable and current Town of Black Mountain
Water Engineering Standard Details; and any other information
necessary for the appropriate and accurate construction of the
proposed water system extension or modification.
3. Addendum to Engineer's Report, Application for Approval,
Data Sheets and Calculations: In accordance with NCAC Title
15A, Subchapter 16C, Section .0300 the engineer of record must,
at a minimum, submit an "Addendum to Engineer's Report" for
every waterline extension project. The format of said report shall
meet the outline presented in Section .0307 of NCAC Title 15A.

A sample version is available on the Town of Black Mountain
Public Work's web page.
An Application for Approval is also required for every waterline
extension project. Also the appropriate data sheets must be
submitted with the Application for Approvals. The most current
version of the Application for Approval and data sheets are
available on the Town of Black Mountain Public Work's web page
for download and completion.
Hydraulic Calculations must be submitted for every waterline
extension project. The calculations shall be based on the hydraulic
flow test information obtained in the Water Availability / Letter of
Commitment process. The hydraulic calculations, at a minimum,
must indicate the residual pressure of the proposed system at the
most hydraulically deficient point for both peak domestic flow and
fire flow conditions. If deemed required additional calculations or
system models may be required to demonstrate adequate system
pressures and flows.
4. Design Report: Submittal for those projects including a
booster pump station and storage tank must also contain a
separate "Design Report" with the following minimum
information:
a. Water Mains and Related Appurtenances:
i. Number people or homes to be served.
ii. Required Fire Flow calculated as required by this
Manual and by theFire Official.
iii. Maximum instantaneous flow as provided in Letter of Commitment.
iv. Total consumption in gallons per day as provided in Letter of
Commitment.
v. Hydraulic analysis of the proposed extension to the water
system, using average day conditions at the point of
connection provided by the Public Works Department,
confirming minimum residual pressures are satisfied
under maximum instantaneous demand with minimum 40
PSI residual at highest point and average day demand
plus maximum fire flow demandwith minimum 20 PSI
residual at highest point.
b. Water Booster Pump Stations and Reservoirs:
i. Pump Data: Rated Design Capa (GPM) and Total Dynamic Head,
Pump Curve, System Curve, and all Supporting Calculations,
Motor Nominal Horsepower and System Power Efficiency at
Design Point
ii. Reservoir Data Basic dimensions - shape, diameter, height
(structure and water level), Overflow elevation, Water capa,

Structural design calculations confirming compliance with
AWWA Standard D100 or D110, as appropriate
iii. Controls, Planning and Instrument Diagram, Proposed
Automatic Control Set Points, SCADA Point Count
c. Service Line Connections:
i. Number and size of domestic connections, peak water
use of each, customer type (residential, institutional,
commercial, etc.), degree of hazard and proposed
backflow assembly.
ii. Number and size of fire line connections, dedicated or in -
line, dry or wet system, use of fire suppression chemicals,
booster pumping (include pump data), water volume and
pressure expected at point of connection to water system,
and type of metering, backflow prevention, and/or water
usedetection devices proposed.
5. Other Submittals and Permit Approvals: As required by specific
project; the following list is intended as a guide to the applicant
but may not be complete for all types of construction. The
Developer's engineer shall be responsible for insuring all
required permits are obtained prior to construction.
a. Buncombe County or NCDENR Sediment and Erosion Control Permits.
b. U S Army Corps of Engineers - Water, Stream and River Crossings.
c. Federal Emergency Management Agency - Designated Flood Plain
Construction.
d. Railway Encroachments or Easements.
e. North Carolina Department of Transportation Encroachments.
f. Town of Black Mountain Street Cut Permit and/or Encroachments.
g. Utility Easements - Obtained for Water Extensions.
h. Pertinent Fire Approvals - Fire Flow and Fire Hydrant Location Approval
B. Review Process
1. Public Works' review and comments to the Developer or his/her engineer.
2 Submittal of revised plans to Public Works with changes required by
review comments in addition to the required Estoppel Certificate,
when applicable.
3. Public Works' final review and approval or rejection of plans. If
the Public Works Department is not the Delegated Authority for
plans proposed, Public Works will forward plans approved by
the Department to NCDENR.

Stage III. Construction Phase
A. Construction Process
1. Pre -Construction Meeting and Authorization to Construct: A pre -
construction meeting is scheduled by Public Works and held with
the utility contractor, owner/developer, and engineer of record
where construction is discussed and documentation is received
confirming required permits, easement, and encroachments.
Payment of fees for taps and flow tests are required before
construction is allowed to begin. Authorization to Construct is
issued at the pre- construction meeting. The pre -construction
meeting shall be conducted within 10 days of the start of waterline
construction.
No construction of extensions or modifications shall begin before
plans are approved for construction and Authorization to Construct
is granted by Public Works through the Pre -Construction Meeting.
Any construction done prior to this Notice may be summarily
rejected or refused without further investigation. In addition,
beginning construction without authorization may violate State
regulations and subject the offender to State enforcement actions.
2 Contractor submits material list sheets / shop drawings for review
by Water Engineering Inspector. If necessary, the inspector will
provide comment and correction for the material list sheets / shop
drawings. Once the contractor submittals are approved,
construction may begin.
3. Contractor constructs work per the conditions of the approved
plans and project specifications, under the observation of Public
Works' construction inspector and other agencies as required.
4. Pressure testing and disinfection of the new water system is
performed. The pressure test and disinfection of new water systems
is coordinated and observed Public Works' inspector.) , - commented PT7]: owe have one of these?
B. General Information for Construction Phase
Contractor License Requirement: All contractors and
subcontractors performing any construction on water distribution
system extensions or modifications, except Personnel of the Public
Works Department, shall be licensed Utility Contractors by the
State of North Carolina. The developer shall provide Public Works
with the names and license number(s) of each contractor or
subcontractor before each begins construction on the water system,
and on site as requested by Public Works staff.

Accessibility During Construction: The construction site shall be
accessible at all times from the Authorization to Construct for
inspection of progress the Public Works Department. Failure to
provide accessibility may result in rejection of the work.
North Carolina Damage Prevention Act Compliance During
Construction, Upon the initiation of construction of water system
extensions or modifications, but prior to the issuance of a Letter of
Acceptance, all locations of the constructed but not accepted water
system, required for underground damage prevention by North
Carolina law, shall be the responsibility of the developer or his
contractor. The Public Works Department will notify the developer
or his contractor of notice of proposed excavation received from
other but will accept no further responsibility.
Field Changes and Modifications: Any significant revision or
modification necessary to take place after plan approval has been
granted must be approved by the Public Works Department. The
engineer of record shall submit the necessary documentation to
demonstrate his/her concurrence with the revision.
The Contractor is to keep the Town of Black Mountain -approved
set of plans on the job site at all times and further, all as -built
changes are to be documented on this set of plans as they occur.
Additionally, the Engineer is to be notified of minor changes even
when a revision or addendum drawing is not required. After Town
approval of a field changes, the Public Works will verify that the
project Engineer has been notified of the change. All changes are to
be incorporated into the final as -built and plat submitted.
On any project where lot lines are revised to add/delete lots
yielding excess and/or non -compliant water meter taps, the
contractor shall be required to plug the service tap at the main,
remove the corporation stop, service line, meter box and meter
setters as necessary. In cases where 2 or more service taps, located
within 5 feet of each other, are to be removed, the contractor shall
be required to remove said taps by cutting the pipe and installing a
mechanical joint sleeve. In situations such as this, the disinfection
procedure could be required to be repeated, or some other form of
additional disinfecting measure shall be undertaken as directed by
the Public Works Department.
C. Connections to Existing Water System
All connections to the existing Water Distribution System shall be
approved by the Public Works Department. Connections include
tapping of existing active water mains or cutting a fitting into an

existing water main. Tapping may be permitted when the new branch
main is equal to or smaller in size than the existing main being
connected to, and there are no valves required on the existing main as
result of the connection pursuant to the VALVES Location section of
this Manual.
Notice: Tapping of an active water main by unauthorizedpersonnel, or cutting of a water
main on the active part of the water distribution system without the observation of the
Town, shall constitute tampering of the water system and shall subject the violator to
fines andpenalties set by the Town of Black Mountain. Further, such actions may cause
serious injury to the public health, and are subject to criminal prosecution either by the
Town of Black Mountain or the State of North Carolina.

Tapping: The contractor shall perform all excavation and backfill,
through trenching and shoring practices which at all times meet the
requirements of OSHA, and shall provide all safety barricading,
traffic control devices, and other protection of the excavation. The
contractor shall expose the water main to be tapped, and clean all
dirt and debris around the main. The contractor shall furnish and
install the tapping sleeve and tapping valve meeting this Manual
and the Technical Specifications and test the tapping sleeve with
compressed air to ensure it is properly installed on the water main.
Sleeve testing shall be performed in the presence of a Water
Engineering Inspector. The pressure test Sleeve and Valve
Assembly shall be pressure tested at 30 PSI air pressure for no less
than 20 minutes.
Only authorized personnel of the Public Works Department are
permitted to make the physical tap on an active water main, using
the tapping machine furnished by the Division. The Public Works
Department shall make the tap by installing its tapping machine on
the tapping sleeve and valve furnished by the contractor.
Through communication with the Inspector, the Contractor shall
provide a minimum of 3 business days advance notice to the Public
Works Department to request a tap; the Contractor is strongly
encouraged to provide additional notice when possible. The Public
Works Department must consider its other scheduled obligations
and the consequence of service interruptions to customers affected,
and has the right to approve or disapprove the Contractor's request.
All requests of less than 3 business days, except emergency repairs,
shall be denied.
Service taps on existing active waterlines shall be made by the
Town of Black Mountain Public Works Department. Service taps
to new waterlines shall be made by the Contractor in conjunction
with an approved water main extension project. Taps made by the
Contractor may be made by wet tap or dry tap. Wet taps shall be
made after the new water system is pressurized but before the new
water main is hydrostatically tested and disinfected and connected
to the active water system.
Cutting in a Fitting: The contractor shall perform all excavation and
backfill, through trenching and shoring practices which at all times
meet the requirements of OSHA, and shall provide all safety
barricading, traffic control devices, and other protection of the
excavation. The contractor shall expose the water main to be cut,
and clean all dirt and debris around the main.

Only authorized personnel of the Public Works Department shall
close the valves on the active water system necessary to relieve the
pressure and allow the water main to be cut. All others wishing to
operate valves shall be specifically authorized in writing by the
Public Works Department. All water shut downs are to be
scheduled through Water Engineering Inspectors 4 business days in
advance.
The contractor shall cut the active water main and install the
required fitting for connection, only under the direct and
continuous observation of the Inspector. The contractor shall
maintain on site, at all times during the work, clean cloths dipped in
HTH solution of chlorinated water (approximately 200 PPM
chlorine solution) and shall use these cloths to swab all equipment,
pipe and appurtenances coming in contact with the interior of the
water main, and shall keep the interior of the water main clean and
free of debris throughout construction. Contractor must also have a
dewatering pump available at all times during this work.
D. Inspection, Testing and Disinfection
All materials used must have a preliminary inspection by the Water
Public Works Inspector before they shall be allowed to be installed.
Materials rejected by the Inspector shall be immediately removed from
the job site.
During construction, testing and disinfection the Town's public water
system shall be protected at all times with the use of an approved
construction pressure test backflow assembly, also called a
construction jumper, installed at the point of connection to the public
system. The construction jumper must remain in place until all testing
and disinfection is complete and the removal of the jumper is approved
by the Water Engineering inspector. If the construction jumper must be
removed prior to completion of all testing and disinfection of the water
system, an air gap must be provided at the point of connection to the
public water system and the water main must be capped and sealed at
both ends of the air gap.
Testing and disinfection is done in accordance with the Technical
Specifications, scheduled with Public Works, and witnessed
continuously during performance until approved by Town as follows:
The Contractor shall furnish all materials, labor, and equipment to
perform all testing, disinfection and inspections to the satisfaction of
the Inspector. The Town of Black Mountain shall provide water for
testing purposes on water mains. Water for the initial hydrostatic test
and initial disinfecting shall be free of charge, however, water for

subsequent repeat testing due to test failure by the Contractor may
result in charges under the Public Works Department's residential
water rate for additional water use.
1. Hydrostatic Testing: Water system testing shall be conducted in
accordance with the Technical Specifications for Testing Pipelines.
All Hydrostatic testing shall be witnessed by the Public Works
Inspector during the full two-hour duration.
All new water service connections, from taps on the main up to and
including meter yokes, meter setters and spool piece for meters in
vaults, shall be installed and included in the hydrostatic testing and
disinfection processes.
There shall be no physical connection between the existing water
system and a new water main until such time as the new waterline
extension is pressure tested, disinfected and a passing clear water
sample obtained, and until all closing requirements are fulfilled in
accordance with this Manual.

2 Disinfecting: Disinfection of completed lines shall be conducted in
accordance with the Technical Specification for Disinfecting
Pipelines.
The maximum total length of water main which may be disinfected
at one time is 3,000 linear feet.
A passing bacteriological is valid for 30 days after the sample was
collected. If more than 30 days pass before final acceptance of the
water system is issued a new water sample must be conducted and
appropriate fees for re -tests must be paid.
All new service connections installed on water main extensions
shall be tapped on the new water main before the water main is
hydrostatically (pressure) tested and disinfected, and the service
connections shall be thoroughly disinfected up to the meter cut-off
valve as the water main is being disinfected. If a contractor taps a
water main for any purpose after the disinfecting test but before the
Letter of Acceptance, the disinfecting test shall become invalid and
will be required to be repeated.
Testing and Certification of Backflow Assembly_: All backflow
assemblies installed as part of a waterline extension must be tested
and certified for proper installation and operation. The testing
procedure shall be performed in accordance with the Town's Cross
Connection Control Policy. The test is conducted by a Certified
Backflow Tester and is to be coordinator by the Developer or
his/her representative.
Until the new backflow assembly has been tested and certified as
operational, the construction jumper or air gap must remain in
place at the point of connection to the public water system.
Stage IV. Close-out Submittals required for the Acceptance of Waterline Extensions:
The following list of close out submittals is to be used as a guide in the
water release process. Depending on specific project some of these
submittals may not be required or additional submittals may be required.
The exact close-out submittals which are required for a specific project are
discussed in detail at the project mandatory pre -construction meeting.
A. Certification of Completion Statements
Developer, Engineer of Record and Contractor of Record must submit
certificate of completion statements. These statements are provided at
14

the mandatory preconstruction conference and are available on the
Town of Black Mountain Public Works' web page.
B. Waterline Easement Plat
In accordance with the requirements outlined in the Right -of -Way,
Easements and Access section under WATER MAINS, the developer
shall grant the Town a 20-foot waterline easement area on all water
system extensions constructed outside the limits of public right-of-
ways. All waterline easements shall be platted, and said plats shall be
prepared by a North Carolina registered professional land surveyor in
accordance with N.C.G.S. 47-30 meeting the minimum surveying
standards as dictated by the North Carolina Board of Examiners for
Engineers and Surveyors. The plat shall, at a minimum, depict the
approximate location of the new waterline extension, the limits of the
easement area, public/private streets/roads and right-of-ways, building
structures and any other feature as may be appropriate. The surveyor
shall include all pertinent information necessary to be able to easily
recreate the easement area in the field, including as many ties to NC
State Plan Coordinate System as necessary.
The surveyor shall provide a preliminary easement plat to the Water
Engineering Inspector, for field verification prior to recording. Once
the plat is field verified, the Inspector will instruct the surveyor to
proceed with recordation.
C. Waterline Easement Document
For projects requiring an easement and recordation of a plat an
easement document must also be executed, which dedicates the
easement area as depicted on the plat to be dedicated to the Town of
Black Mountain. The standard form easement document is provided
to the Developer at the mandatory preconstruction conference. After
completion of the easement form by the developer, the easement
documents are to be submitted to the Public Works Department for
signatures along with the applicable recording fee to according to
Buncombe County Register of Deeds
Recording of all easements, plats and documents required for operation
and maintenance of completed water extensions. Separate deeds are
required for additional property easements, and when conveying real
property to the Town of Black Mountain.
D. As-built/Record Drawings
The Engineer of record shall provide the Water Engineering Inspector
with a paper copy of the as -built drawings for field verification, upon
completion of construction of the Water Distribution System extension
or modification, and prior to the final inspection. Upon field
verification, the inspector will communicate any necessary revisions or

instruct the engineer of record to prepare the final paper as -built
drawing, the electronic as -built drawing and coordinate file.
The record drawings shall include all water distribution system
facilities constructed, including pipes by size, bends and other fittings,
valves, hydrants, taps, service lines and meter boxes, pump stations,
reservoirs, and waterline easement area(s) to be conveyed to the Town
, properly depicted using universal drawing symbols on the drawings
which correspond to installation locations.
Electronic As-built/Record Drawings
The Engineer of record shall submit 1 copy of the digital electronic
file in AUTOCAD.DWG format; (the latest release of AutoCAD,
which is utilized by the will be required); on a CD to the Public
Works Department upon completion of construction of the Water
Distribution System extension or modification, and prior to the Letter
of Acceptance. The electronic as -built shall have the installed
waterline(s) and all water appurtenances in a separate isolatable layer
along with the pertinent NC grid coordinate data. All property line(s)
and right-of-way(s) information shall be in a separate "isolatable"
layer.
E. Coordinate File:
Coordinate values (Northing, Easting) and MSL datum elevations for
all installed waterline appurtenances shall be delivered in a comma
delimited ASCII file in the format Point Number, Northing, Easting,
Elevation, and Description. Coordinates shall be based on North
Carolina State Plane Coordinate System, Feet as Units of Measure,
NAD 83' Horizontal Datum and NAVD 88' Vertical Datum.
The drawings shall reference which Datum is used and the units of
measurement. The surveyor has the option to provide this file as a `.txt'
or `.xls' file with the same format as mentioned above.
F. Sprinkler System Certification
Sprinkler System Certification form(s) shall be required for all fire
sprinkler system connections that have a backflow prevention device
other than a reduced pressure zone backflow prevention assembly. The
Sprinkler System Certification is provided to the Developer at the
mandatory preconstruction conference for completion. The form
requires certification from the sprinkler system designer that the
sprinkler system does not have chemicals, pumps, Fire Department
Connections (FDC) or other attributes that would classify the system as
high hazard for a backflow condition.
G. Official list of assigned addresses
Developer obtains and submits official list of lot numbers and 911
addresses as assigned by the office of the address coordinator having
16

jurisdiction for the project. The official list shall be on the letterhead
of the appropriate address coordinator.
H. Backflow Assembly Certification
For all water system extension that require a backflow prevention
assembly to protect the public water system; testing and certification of
the backflow assembly must be completed prior to the acceptance and
activation of the water system extension. A backflow assembly
certification must be submitted to the Public Works Department to
indicate that the testing of the assembly has been completed and the
assembly is properly installed and functioning.
L NCDENR approvals
The final approvals and acceptance of the water extension from the
State Office of NCDENR must be submitted prior to final release and
acceptance by the Town in those cases where the State Office of
NCDENR plan approval and authorization to construct were required.
Stage V. Final Inspection and Project Acceptance:
A. Final Inspection
A Final inspection is scheduled and facilitated by Water Engineering
Inspector. Prior to the final walk-through, all required close-out
documents must be submitted and approved by the Public Works
Department. During the final inspection it will be verified that all
requirements have successfully been met. If necessary the construction
inspector will prepare a punch list of items to be corrected by the
contractor. After being notified by the contractor that the corrections
are made, the inspector will re -visit the site to verify completion.
B. Acceptance of Water Service
A written Letter of Acceptance shall be issued by the Public Works
Department before water meters will be installed and water services can
be permanently activated to properties served from the new water
system extension or modification. All closeout requirements shall be
completed before Public Works prepares the Letter of Acceptance.
In cases where minor construction work not affecting operation of the
system and/or closeout documents remain to be completed, a
Temporary Letter of Acceptance may be obtained. A Temporary Letter
of Release may be granted, provided the following requirements are
fully met:
1) Payment of temporary meter release fees under the current Water
Fees and Charges Schedule;
2) Conveyance of a letter of credit, in the amount of 150%, minimum
of $3,500 of the estimated value of the remaining work, including the
17

costs associated with preparation and execution of all pending close-
out documents as a guarantee that the work will be completed;
3) Completion and approval of testing, disinfecting, and inspection,
including a preliminary final walk-through;
4) Submission of the Engineer's Certificate and the Official list of
addresses for the desired meters.
5) Submission of the Backflow Assembly Certification if required for specific
project.
Other temporary water service may be provided for provisional use
from a fire hydrant installed as part of a new water extension (or
improvement) in accordance with the Water Policies regarding
temporary service through fire hydrants, provided that completion and
approval of all Testing, Inspection and Disinfecting has been achieved.
Stage VI. One Year Warranty Period. Inspection and Repair of New Lines:
A. Contractor's Warranty
The Contractor responsible for the construction of the Water
Distribution System extension or modification shall provide the Public
Works Department a written warranty, valid for one year from the date
of the Letter of Acceptance, against any and all defects due to faulty
materials or workmanship and providing that the Contractor shall
promptly make such corrections as may be necessary by reason of such
defects at no cost to the Public Works Department upon reasonable
notice by the Public Works Department. Reasonable notice shall be 7
days for non -emergency corrections, but may be as limited as 4 hours if
the defect has resulted in a threat to public health and safety or an
interruption of water service to a customer. In the event the Contractor
fails to make the repairs, adjustments, or other work required to correct
the defect within the reasonable notice, the Public Works Department
may make the repair and charge the Contractor the cost incurred.
In the event the Developer cannot obtain a written warranty from the
Contractor, the Developer may provide a written warranty through a
performance bond or a letter of credit in the amount of 50% of the
cost of the construction cost of the extension or modification project.
B. Warranty Inspection
A warranty inspection is scheduled and facilitated by a Water
Engineering inspector with the Developer/Contractor within 30
days prior to expiration of warranty period. During the warranty
inspection it will be verified that the water system and all
appurtenances are in good working order and that there are no
RM

workmanship defects with the water system or associated
construction work such as trenches, asphalt overlays, etc. If
necessary the construction inspector will prepare a punch list of
items to be corrected by the contractor. After notification by the
contractor that any required corrections are made, the inspector
will re -visit the site to verify completion and issue release of the
warranty-
C. Repair of New Waterlines
1. Water Main Repairs: Joint Leaks, Line Breaks, or Punctures on
new water mains shall be repaired by replacing the damaged
section of ductile iron pipe with a mechanical sleeve. The use of
wrap around sleeves will not be allowed on new water pipe.
Water Service Line Repairs: A water service line severed between
the water main and the water meter shall be repaired using new
type K copper tubing and bronze or brass 3 piece compression
unions.
WATER MAINS:
A. Material:
All water mains shall be constructed of ductile iron pipe and fittings as
specified by AWWA C150 and C151 for laying conditions per the Town of
Black Mountain Standard Trench Detail and as required by the Technical
Specifications. All water main pipe and fittings shall be rated for a working
pressure greater than the highest design static pressure in the location where
the pipe is being provided. At a minimum, all pipe and fittings 12 inches or
less shall be rated class 350 PSI and pipe and fittings larger than 12" rated
class 250 PSI.
B. Size:
All water mains shall be sized in conformance with the latest Water
Distribution System Master Plarr adopted by the Public Works Department. In , - commented PTs]: Do we have one of these?
locations not provided for in the Master Plan, the standard size water main
shall be 8 inches in diameter. However; a water main may be 6 inches in
diameter within local areas of distribution where the extent of present and
future service demand can be fully defined and adequate residual water
pressure can be maintained throughout as required by the Water Policies. The
predicted residual pressure shall be confirmed through engineering hydraulic
calculations, for both peak domestic flow conditions and a maximum fire flow
condition during average day demand using a friction coefficient equivalent of
C=120. The maximum allowable length of a dead-end 6-inch main is 2,000
feet; provided that the Director may grant an exception when all of the

following are true:
(1) The existing main at the point of connection is 6 inches;
(2) The proposed extension as a 6-inch main will provide adequate
volume and pressure over its entire distance, including peak
demands and fire protection;
(3) The most recently adopted Master Plan does not specify otherwise for this
location;
(4) There is no practical means to connect the extension to another
existing main 6 inches or larger anywhere along its route.
When the proposed main passes within 400 feet of an existing main 6
inches or larger and a connecting water main can be placed across
this separation in accordance with this Manual, connection is
considered practical.
C. Parallel Waterline Installations:
Waterline extensions proposed in areas where smaller diameter water mains
already exist shall be built in a way to avoid duplication of maintenance
responsibilities. As a minimum, the design of such mains shall include re-
connection of all existing water meters and abandonment of the existing
smaller diameter main within the limits of the water extension area. In areas
where the new main does not extend the entire length of the existing waterline,
the design shall show a connection back into the existing main at a convenient
location near the terminus of the proposed waterline.
D. Thrust Restraint:
All fittings, bends, tees, crosses, valves shall be adequately restrained.
Approved restraint includes retaining glands, field lock gaskets and restraint
systems provided by approved pipe manufacturers. Minimum restrained
lengths for pipe diameters up to 10 inches and working pressures up to 200
PSI, shall be as indicated in Figure W05:
Figure W03-a: RESTRAINED LENGTH CHART
Recommended Minimum Restrained Length Required Each Side of Fitting (Feet)
Fitting Type
Size
Working Pressure (PSI)
125
150
175
200
Horizontal 11 1/4 Deg.
6"
4
4
5
6
8"
5
6
7
8
10"
6
7
8
9
Horizontal22 1/2 Deg.
6"
7
9
10
12
8"
10
12
14
16
10"
12
14
17
19
Horizontal45 Deg.
6"
16
22
25
8"
20
24
28
33
10"
25
30
35
40
Dead End
6"
26
31
36
41
8"
1 34
41
48
55

10"
58
167
Reducer
8"x6"
1 14 1 17
20
123
10" x8"
1 14 1 17
1 20
123
12"x10"
1 14 1 17
1 20
123
Tee
To be calculated on a case by case basis.
90 deg. and Vertical Bends
To be calculated on a case by case basis.
In all cases above, the minimum restrained joint lengths will be equivalent to
standard full length pipe joints.
Restrained lengths for fittings 12 inches and above and for areas where the
operating pressure is above 200 PSI shall be calculated by the engineer of
record and submitted for approval.
Straight lengths of pipe that are installed on or along roadways with grades
exceeding 12%, within steel encasement pipe, where there are special laying
conditions or unusual installation blocations; shall be adequately restrained by
approved methods. Otherwise straight lengths of pipe, regardless of size and
system operating pressure, are not required to be restrained.
The use of poured concrete thrust blocks will be permitted, as depicted in the
pertinent Standard Detail, where connections are made to existing waterlines
or under other such special conditions where use of mechanical restraint is not
feasible. The use of pre -cast concrete thrust blocks shall not be permitted.
The use of a concrete dead -man and steel rods will be allowed for the
installation of end -of -line plugs, as depicted in the pertinent Standard Detail.
E. Water Main Location and Installation Requirements
Water mains shall be located outside paved or otherwise improved surfaces in
a minimum 5 foot wide grassed utility strip, free from trees, bushes and/or
above ground structures. Waterlines are to be installed on the cut side of slopes
where possible.
For special circumstances, such as Hillside Developments, water mains may
be permitted to be installed under roads, sidewalks or similar hardscaped areas.
These variances are granted on a case by case basis only after it has been
deemed that it is not feasible to adhere to the standard location requirements.
When waterlines have been permitted to be installed under private roads,
sidewalks or similar hardscaped areas, an Estoppel Certificate must be
executed by the applicant stipulating that the Town of Black Mountain will not
be liable for road, sidewalk repairs or any other surface improvement repairs
necessitated by any water operation or water maintenance activity.
Waterlines not following a public or private road /drive meant for vehicle
ingress and egress are deemed cross-country waterlines. Cross-country
waterlines are allowed on a case by case basis. At a minimum a 12 foot wide
all-weather access road with a grade of no more than 15% must be provided

along the cross-country waterline route and all other applicable standards
adhered too. Additional requirements for cross-country waterlines may be
applied at the Director's discretion.
All water mains shall be specified to be installed with a standard minimum
ground cover of 3 feet but not greater than 5 feet of ground cover, except
where prohibitive conflicts of limited distance require deeper installation.
Ground cover shall be measured as the distance from the top of the pipe to
final grade. When grading is to be altered during construction, the proposed
final grade shall be shown on the plans for water system construction. Sections
of water main deviating from 3 feet of cover shall be profiled on the plans. The
profile must show waterline elevations, existing and or proposed ground
elevations and the item(s) in conflict.
Water mains shall not be installed along roads or land with slopes greater than
18%. Where water mains are installed along roads or land sloping greater than
12%, the following minimum special provisions must be met, to ensure the
adequacy for moving and utilizing construction equipment and for
maintenance and repair:
1) Use of restrained joint type;
2) The depth of cover shall not exceed 36-inches to the top of the pipe.
3) New waterline(s) must be installed above all other underground utilities.
Subject to the approval of the Public Works Department, a waterline may be
installed on a 2:1 slope (50% slope) for a maximum length of 40 feet. Isolation
valves must be installed on the water at the top and bottom of slope. In these
cases, the pipe shall be restrained and installed no deeper than 36 inches to the
top of the pipe. There is to be flat area at the top and bottom for adequate
working conditions. Other slope and length variances shall be reviewed and
approved on a case -by -case basis.
See the Technical Specification for Ductile Iron Pipe for more detail regarding
waterline installation.
F. Relation of Water Mains to Other Utilities_ Structures and Trees
Sanitary Sewer: Water mains shall be laid at least 10 feet laterally measured
edge to edge from existing or proposed sanitary sewer. If the elevation of the
bottom of the water main is at least 18 inches above the top of the sanitary
sewer a clear horizontal separation of at least 3 feet is allowable.
Where a water main and a sanitary sewer cross, the minimum vertical
separation is 18 inches between the bottom of the waterline and the top of the
sanitary sewer line. If the vertical separation is less than 18 inches or the
waterline passes under the sanitary sewer; the water main and the sewer line
shall be ductile iron pipe equivalent to water main standards for a minimum
distance of 10 feet on each side of the crossing. Water mains should only
cross -sanitary sewer mains at an approximate 90-degree angle.
22

The minimum distance of the water main to the outside edge of manholes is 5
feet when the sanitary sewer line is at least 18 inches below the waterline and
10 feet under other circumstances.
Storm Drain: Water mains shall be laid at least 10 feet laterally measured edge
to edge from existing or proposed storm drain. If the elevation of the bottom of
the water main is at least 12 inches above the top of the storm drain a clear
horizontal separation of at least 3 feet is allowable. Where a water main and
storm sewer main cross the minimum vertical separation is 12 inches and the
crossing should be at an approximate 90-degree angle.
Natural Gas Mains, Cables, and Other Utilities: Other utilities shall have a
minimum horizontal clearance of 3 feet and vertical clearance of 12 inches, to
permit proper maintenance of the water main.
Gas and other Utilities with Cathodic Protection: Waterlines are to be
installed away from stray currents and outside the areas of influence caused by
corrosion prevention systems, or other sources of corrosion causing currents.
When this is not practical, the iron pipe is to be protected by polyethylene
encasement in accordance with ANSI/AWWA C105/A21.5, and extending on
either side beyond the limits of the area of influence; or be protected by other
approved methods that are acceptable to the Public Works Department.
Structures and Trees: A minimum of 10 feet horizontal distance is required
from all retaining walls or structures to new waterlines. Care shall be taken to
locate waterlines outside of zones of influence for structure and wall
foundations. A minimum of 5 feet horizontal distance is required between
waterlines and utility and/or light poles. A minimum of horizontal separation
of 3 feet is required between waterlines and the drip line, at maturity, of trees
and other shrubs.
G. Rieht-of-Wav_ Easements and Access
All water distribution system extensions or modifications to be owned and
maintained by the Town of Black Mountain shall be within a publicly -owned
and maintained street right-of-way or within a permanent utility easement at
least 20 feet in width. Preference shall be given to street rights -of- way over
utility easements when practical. Prior to project approval, any necessary
encroachments must be approved and provided to the Town of Black
Mountain, for waterlines within existing rights -of -way.
Permanent utility easements shall be of legal form satisfactory to the Town of
Black Mountain Attorney's Office and shall reference a plat prepared and
sealed by a registered land surveyor showing the exact location and
dimensions of the easement. The plat may be referenced as a separate recorded
map or be recorded as a referenced attachment to the easement form. After
approval is received from the Water Engineering Inspector, all permanent
23

easements shall be recorded in the office of the Register of Deeds in the
county where the property is located.
The utility easement shall be sufficient to allow continuous adequate access for
maintenance of the water main. No permanent above ground structures,
brush/trees, or other impediments to access, shall be permitted within the
easement, except as provided under the requirements for relation of water
mains to other utilities, structures and trees. The easement shall permit the
construction and maintenance of improved all-weather roads for access as
necessary. Public Works may require sufficient permanent utility easements to
be dedicated to the Town of Black Mountain which will permit future waterline
extensions to all adjoining property.
All permanent water utility easements shall exclude the use of the easement
for utilities other than water unless pre -authorized by the Director as a joint -
use utility easement. For joint -use easements minimum horizontal separation
requirements above, shall be enforced by the Grantor and the Grantor shall
further be responsible to the Town of Black Mountain to enforce repair or
corrective work for damages or limitations of access to the Water System
caused by other utilities.
For waterlines that are to cross the land not belonging to the
applicant/developer all permanent easements shall be obtained, platted,
recorded and granted to the town ahead of final plan approval. All easement
forms and plats must conform to the requirements outlined in previous
paragraphs-
H. Steel Encasement Pine
Encasement Pipe must be used for all bore installation of water main, at all
creek crossings and other locations as deemed necessary by the Public Works
Department.
The steel encasement pipe must be at least 8 inches larger than the nominal
diameter of the carrier pipe and be compliant with the appropriate standard
details and the Technical Specification for Encasement Pipe Installation.
FIRE HYDRANTS AND FLUSHING DEVICES:
A. Hydrant Materials
All fire hydrants shall meet or exceed the requirements of AWWA C-502, be
listed by Underwriters Laboratories, Inc. and have Factory Mutual Research
approval. All hydrants shall be rated 250 PSI working pressure minimum and
be tested to 500 PSI minimum. The rated working pressure shall be cast on
the hydrant barrel. All fire hydrants shall have two 2 `/z" hose connections and
one 4 `/z" pumper connection, a 6" shoe and a 4 1/2" main valve opening.
24

Hydrants shall be of the compression type, constructed such that the main
valve closes with water pressure to assure no loss of water in the event of
damage to the upper portion of the hydrant.. The hydrant operating nut shall
open left or counter clockwise.
For fire hydrant information, see the Technical Specification for Valves and
Appurtenances. A list of approved fire hydrants is included in the Approved
Manufacturers Products List.1 commented PT91: ??
B. Installation_ Location and Snacin2 of Fire Hvdrants
Fire hydrants shall be supplied by water mains at least 6 inches in diameter. A
gate valve shall be provided on each branch line to fire hydrant assemblies and
shall be located within 24 inches of the hydrant branch tee. When a hydrant is
located on the opposite side of the street from the water main a second valve
must be installed within 3 feet of the hydrant base.
All fire hydrants shall be installed plumb with permanent surrounding grade at
the "bury line" cast on the hydrant; grade shall not be "dug out' or mounded
around the hydrant to satisfy this requirement. Fire hydrants which have been
installed must be tagged "OUT OF SERVICE" or bagged until such time as
the water main to which connected is disinfected and connected to the active
water system.
Fire hydrants shall be located at street intersections whenever possible;
however, additional fire hydrants may be located between intersections when
necessary to meet spacing requirements. Hydrants between intersections shall
be located adjacent to boundaries between adjoining properties in subdivided
areas. Hydrants shall be staggered on waterlines along divided highways.
Hydrants shall be located in accordance with the Town of Black Mountain
Standard Detail for Hydrant Location.
The maximum distance between hydrants, measured along the street
centerlines, shall be 500 feet. In cul-de-sacs and dead-end waterlines, the last
hydrant shall be at the end of dead-end waterline and shall serve as a blow -off
assembly.
When new buildings are constructed or existing buildings are expanded,
required fire hydrants shall not be determined by requirements of the NC Fire
Prevention Code. Contact the Black Mountain Fire Department, or the fire
department having jurisdiction in the project area, to determine required fire
hydrant locations.
The fire hydrant locations shall be coordinated with the parking and street
design.
Fire Hydrant Ownership
25

Publicly Owned Fire Hydrants: Fire hydrants located along public street
right-of-ways, or within public utility easements, and connected to the
Water Distribution System, shall be owned, operated and maintained by
the Town of Black Mountain as part of the Water Distribution System.
Additional fire hydrants on private property meeting the requirements of
the TBMFPC (Town of Black Mountain Fire Prevention Code) or the Fire
Official, may be publicly conveyed to be part of the Water Distribution
System under one of the following conditions:
(1) If the Director determines that an extension of a water main with fire
hydrants across the private property, to be part of the Water
Distribution System, is necessary for the overall public benefit of the
Water Distribution System and the private property owner grants a
public utility easement along the extension to the last fire hydrant;
(2) If a 6-inch or larger branch waterline with fire hydrant is extended not
greater than 100 feet beyond the public right-of-way or easement
where the water main is located, provided continuous access by fire
engine or water service and maintenance equipment is provided and the
hydrant is visible along such access, and a public utility easement is
granted over the waterline to the hydrant.
At Public Works Staffs discretion a swing check valve may be required on
the waterline extension to protect the rest of the public system from
backflow conditions.
Privately Owned Fire Hydrants: All fire hydrants located beyond a Town
of Black Mountain master water meter shall be privately owned and
maintained. Fire hydrants installed on a dedicated fire line shall also be
privately owned, operated and maintained.
C. Reauired Fire Flows
Neither the Town of Black Mountain nor the Public Works Department
provide any guarantee of the Water Distribution System's capability to
deliver water flow and residual pressure the Fire Official may require for
fire protection. It is the sole responsibility of the Developer to provide for
an adequately designed fire suppression system, extension and
improvement of the Water Distribution System, or both, as necessary to
meet the requirements of the Fire Official to protect the land and building
improvements to which the Water System, will serve. This shall also apply
where distribution system pressure exceeds the manufacturer's pressure
specifications.

Where building sizes have not been determined, the minimum base fire
flow shall be 500 GPM for single family dwellings and 1000 GPM for
other uses. The above flows will be used to verify compliance with the
established minimum residual pressure requirements of 40 PSI and 20 PSI
for domestic and fire flow conditions, respectively.
For specific fire flow requirements contact the Black Mountain Fire
Inspector's Office or contact the fire department having jurisdiction in the
project area. Additional fire flow requirements for the Town of Black
Mountain Fire Inspector can be viewed under the Engineering Town of
Black Mountain's Standard Specifications and Details Manual.
The Owner/Developer of the extension or modification to the Water
Distribution System shall demonstrate by actual fire flow tests that the
system will supply the required fire flows. For public fire hydrants these
tests are conducted by the Public Works Department. It is the
Owner/Developer's responsibility to pay the required fees for the test. For
private fire hydrants the Owner/Developer must pay the required fees for
the test, coordinate the tests through Public Works or contact the fire
department having jurisdiction in the project area.
D. Temporary Blow -offs
Blow -offs may be installed at the end of all temporary dead-end waterlines
which are required due to project phasing where it is not practical to install
a permanent fire hydrant.
E. Flushing Devices
Fire hydrants shall serve as points of flushing in most situations.
The Public Works Department may require the installation of
Automatic/Remote Operated Flushing Assemblies, equipped with metering
device, for water system extension projects for which the built -out process
may take considerable time after completion of water system construction,
and the total length of waterline installed is such that water quality can be
compromised by lack of circulation. Requirements for such installation
will be decided on a case by case basis. Automatic flushing assemblies can
either be a stand-alone unit or a unit attached to a fire hydrant and shall be
as specified in the Approved Manufacturers Products List.l
Disposal of the chlorinated water during flushing shall comply with all
federal, state, and local regulations. Chlorinated water must be
dechlorinated before discharge into the stormwater system, or it may be
discharged into a sanitary sewer line.
- Commented PT701:???

VALVES
A. Main Line Valve Types and Materials
1. Ball valves shall be installed on waterlines less than 2 inches in
diameter and shall conform to AWWA C800. Ball valves shall be rated
for 300 PSI working pressure. Operating nut shall be "curb key" design
for quarter turn open or close and shall open left.
2 Gate valves shall be installed on all waterlines 6 inches and 8 inches in
diameter. Gate valves shall be resilient seated gate valves
manufactured to meet or exceed the requirements of AWWA C-509 of
latest revision, be listed by Underwriters Laboratories, Inc. rated for
200 PSI operating pressure and have Factory Mutual research approval.
3. Butterfly Valves shall be installed on all waterlines 10" and greater in
diameter All valves 10-inches shall be butterfly valves. The butterfly
valves shall be rated for 250 PSI working pressure and be in
accordance with applicable AWWA standards.
See the Valves and Appurtenances Technical Specification for more technical
valve detail. Also, for approved valves, see fthe Approved Manufacturers
Products List.L Commented PT7 II: 77
B. Valve joints and operating direction
All valves for water mains shall be for underground installation with
mechanical joint connections (except tapping flange on tapping valves).
All valves shall open left or counterclockwise, and except for 2-inch ball
valves, all valves shall have a 2-inch square operating wrench nut. Wrench
nut shall be within 3 feet of the top of the valve box.
C. Location
Valves shall be installed within 24 inches of branch fittings (either tee or
cross) at the intersection of two water mains, or a water main and either a
hydrant or blow -off branch line. Maximum separation between valves
along a water main shall be 1000 feet for valves up to 10 inches in size.
Higher separation, up to 2,000 feet or as required at strategic locations,
may be allowed for valves larger than 10 inches.
1. The number of valves at a branch fitting shall be determined as
illustrated in Town of Black Mountain Standard Detail for Valve
Configuration and described as follows:
2 At a cross fitting with only one direction supplying from the water
source, a minimumof three valves shall be installed, one on each of
the "dead-end" directions.
28

3. At a cross fitting with three directions supplying from the water
source, a minimum of three valves shall be installed, one in each
supply direction.
At a cross fitting with two directions supplying from the water
source, four valves shall be installed, one in each direction.

5. At a cross fitting with all four directions supplying from the water
source, three valves shall be installed in the directions with smaller
diameter mains (if the main size is the same in all directions,
designer choice).
6. At a tee fitting with only one direction supplying from the water
source, a minimumof two valves shall be installed, one on each of
the "dead-end" directions.
7. At a tee fitting with two directions supplying from the water source,
a minimum of two valves shall be installed, one in each supply
direction, except at a hydrant tee one valve shall be on the hydrant
branch and the second on either side of the tee.
When there already exists a valve within 200 feet of a tee or cross
intersection in one or more directions and the requirements above
would specify a new valve in that direction, the existing valve is
deemed to be sufficient and an additional valve in that direction is not
required.
When compliance with the above standards requires that a fitting and/or
valve(s) be cut into an existing water main during a service interruption,
the Contractor shall include in the tie-in the installation of an additional
valve at no additional cost provided that the Public Works Department
furnishes the additional valve and accessories to the Contractor.
D. Tappingvalves
alves
All tapping valves shall be resilient seat gate valves furnished with a
tapping flange in accordance with MSS SP60 and drilled and faced in
accordance with 125 pound standard. The branch opening shall be
mechanical joint and compatible with Mueller tapping equipment.
Tapping valves shall otherwise conform to the standards for a gate valve.
E. Air Release Valves
Air release valves shall be float -controlled automatic air release valves
installed at all high points of waterlines. Air release valves must meet the
requirements of AWWA C512. Air release valves 2 inches or smaller shall
be installed according to the Town of Black Mountain Standard Air
Release Valve Installation Detail; 4 inches and larger air release valves
shall be installed according to Standard Detail for 4" and Larger Air
Release Valve. The size of the air valve shall be designed by the Engineer.
F. Pressure Reducing/ Pressure SustainingValves
alves
Pressure control valves will be required where normal operating pressures
are calculated to exceed 200 PSI. Parallel valve installations will be
30

required with a minimum of 2 control valves. Typical installations would
have 2-inch control valve for low flow conditions and an appropriately
sized larger valve for peak demand conditions, including fire flow. These
control valves shall be installed in a manhole structure in accordance with
the Town of Black Mountain Standard Details for Main Line Pressure
Reducing and Pressure Sustaining Valve Station details.
The operation of pressure reducing / pressure sustaining valves shall be
monitored and controlled remotely with the use of a telephone line
controlled SCADA system. Conditions monitored by SCADA include:
intrusion alarm, inlet pressure and outlet pressure. See the SCADA
Instrumentation & Control Technical Specification for more detailed
SCADA requirements.
See the Approved Manufacturers Products List for approved pressure
reducing / pressure sustaining valves.
G. Flow/Level Control Valve Actuators
An electronic actuator shall be used to control the position of the butterfly
control valve. The actuator shall be of the multi -turn type, driven by an
electric motor. The actuator shall have both electric and torque switching
for proper open/close operation. For approved control valve actuators see
the Technical Specification for SCADA Instrumentation & Control.
WATER SERVICE SETTINGS AND METERS:
A. General Requirements for Service and Meter Installations
All platted lots, whether existing or proposed as part of a subdivision, shall
have a separate water service connection to a distribution main without
crossing adjacent lots. No individual water meter may serve more than one
property. There shall be only one customer responsible for the bill for all
metered water consumption on each individual water meter as defined by
Water Policies.
All service connections shall be made perpendicular from the main line,
shall run straight to the meter, and be located directly in front of the
building served.
All water mains shall be extended such that all water meters are on or
immediately adjacent to the property being served, unless approved
otherwise by the Director.
Where meters are provided to serve more than one building on the same
property, each meter shall be located directly in front of the building
served and the meter boxes shall be clearly labeled to describe the address
of the building served. A permanent nameplate with engraving of address
IF

shall be permanently secured to the interior wall of each meter box within
3" of the top of the box, of non -corrosive materials. The developer or
builder is also responsible for insuring that plans for construction define
which meter goes with which unit or building, and that the plumber hired
to connect the plumbing to the building or units connects the plumbing to
comply with the schedule shown on the plans and labeled on the meter
boxes.
All construction of water main extensions to serve new single-family
residential subdivisions shall include the extension of service lines, meter
boxes, and meter fittings, except the water meter, all in accordance with
the Technical Specifications. Where possible, domestic and fire service
connections shall be included in water main extensions to commercial /
industrial property. At a minimum, a 6-inch waterline shall be stubbed out
to each property and capped at the property line. All service lines, meter
boxes, and meter vaults to be constructed as part of the water main
extension shall be shown to scale on the approved plans for construction.
The length of all water service pipe shall be such to avoid any unions
between the corporation stop and the water meter.
In residential areas, meter boxes shall be located 3 to 5 feet beyond the
edge of pavement or back of curb as applicable, in a flat area, away from
steep slopes. Water meters shall not be located in drainage ditches,
sidewalks, driveways, parking areas or other areas where they are
susceptible to vehicular traffic. Where adequate space is not available
between the edge of pavement and drainage ditches, the meter box shall be
located beyond the drainage ditch at the first possible location; maximum 3
feet beyond the ditch.
In certain circumstances, specifically within the Central Business District,
meter boxes may be approved for placement in public sidewalks, but water
service will be limited to one meter per building.
All master meter vaults shall be located outside the street, sidewalk, or
parking areas, away from vehicular traffic, and within an easement area
immediately adjacent to the road right -of- way. The easement area shall be
a minimum of 20 feet wide and shall extend approximately 10 feet from
the back of the vault.
For more detailed information regarding service taps, see the Water
Service Connections Technical Specification.
B. Tvnes of Water Service
1. Domestic Services: Individual water services shall be provided from
the main to each water meter for single family residences in
accordance with the Town of Black Mountain Standard Detail for 5/8"
32

to 3/4" Water Meter Box.
"Split connections" may be permitted, whereby a 1-inch tap and 1-inch
service line serves 5/8-inch meters, constructed in accordance with the
Town of Black Mountain Detail for Standard Multiple Branch
Services, under the following conditions: (1) on or adjacent to a lot
with two or more meters serving two or more buildings (maximum 1
meter per building); or
(2) along a property line where the developer or builder is providing
meters to each of two adjoining lots, provided each meter is on the
property being served.
2. Irrigation service: All irrigation services, according to NC State Law,
shall have a separate metered service line. All irrigation services are
considered high hazard in relation to backflow protection requirements
and must be protected with a reduced pressure principle backflow
prevention assembly, installed in an above -ground heated, insulated
ASSE 1060 enclosure, and in accordance with all applicable
regulations.
All irrigation services shall serve no more than one individual property
and shall not connect with any building structure or with any other
consumptive -use water service.
3. Kesidential Fire Sprinkling: Fire sprinkler heads may be installed on
residential domestic plumbing lines. These combined systems must be
on a single service line and single meter. The meter shall be an UL/FM
approved fire service turbine meter and shall be sized for the peak fire
flow requirement. Dedicated fire service lines for single and duel
family residential dwellings may be approved on a case by case basis.
These dedicated services must be served be a separate service tap from
the residential system. They must be metered utilizing an UL/FM
approved fire service turbine meter, sized for the peak fire flow
requirement. Adequate backflow protection is required on all dedicated
fire lines.
4. Combination Fire and Domestic Water Service: Combination fire and
domestic water service will be required for all commercial, institutional
and industrial applications where domestic and fire protection services
are to be provided. The master meter assembly shall be installed in a
below ground vault in accordance with the Town of Black Mountain
Standard Detail for Combination MeterNault Enclosure and shall be
located per the requirements for master meters. Adequate backflow
protection is required. Waterline extensions beyond the combination
fire/domestic master meter must be designed and constructed in
accordance with this manual to a point within 5 feet of entry to a
structure.) Commented [JTt 2]: Can Fire verify this is up to date
with NCFC7
KK

Dedicated fire lines which incorporate private fire hydrant connections
must be fully metered. Adequately sized UL/FM approved fire service
turbine meters are to be used for metered dedicated fire lines. For
metered dedicated fire lines; the connection, isolation valve, meter and
fire line up to the meter shall be owned and maintained by the Town of
Black Mountain and the remainder components, beyond the meter shall
be owned and maintained by the customer.
Dedicated Fire Lines: Under certain conditions, a variance to the
requirement for combination fire and domestic water service may be
granted. The variance will allow for installation of a flow detector, in
lieu of a combination water meter, on an individual dedicated fire line
which does not incorporate private fire hydrants. The flow detector
must be factory built into the required backflow assembly. If the
variance is granted the Customer must agree to execute and abide to
the terms of a provided special Estoppel Agreement, which gives the
Town the authority to require a full size water meter be installed on
the dedicated fire line at full cost to the customer if unauthorized flows
are detected. All non -metered dedicated fire lines must have an
isolation/tap valve, installed at the connection point to the public water
main. The connection and the isolation valve shall be owned and
maintained by the Town of Black Mountain and the remainder
components, beyond the isolation valve shall be owned and maintained
by the customer.
Additional Fire Line Requirements: All water connections for fire
suppression systems, with the exception of those combined with
domestic service for single and duel family residential dwellings shall
be designed by a North Carolina registered professional engineer and
reviewed by the Water Public Works forapproval.l_
Dedicated fire lines may have branch connections only to private water
storage or booster pumping facilities which are solely to and constitute
part of the fire suppression system; branch connections or plumbing for
any other purpose is strictly prohibited.
No fire suppression system shall be designed or installed on a fire line
connection to the Water Distribution System which when operating
will reduce the public water system residual pressure below 20 PSI.
Where sprinkler systems are used, a fire department connection shall
be provided on the building or as otherwise approved by the Fire
Official. Connection location(s) must be approved by the Fire Official,
and are required to be within 100 feet from a fire hydrant. Where
sprinkler systems or a riser room are required, outside access in
- Commented [JT13]: Verify up to date NCFC
Commented [JT14]: Charlie verified that all is up to
date with current NCFC and should read "in accordance
with applicable standards"

accordance with the N.C. Building Code shall be provided.
The Town of Black Mountain reserves the right to bill the
owner/developer for the consumption of potable water used to test
dedicated fire lines and sprinkler systems.
C. Methods of Metering
Some development types have the option of extending the public water
system, for Town of Black Mountain ownership and maintenance, within
private streets and or rights -of way. As a condition for approval of the
installation of a public water system on private property, the Developer
must grant to the Town of Black Mountain a Permanent Waterline
Easement and a properly executed Estoppel Certificate stipulating that the
Town of Black Mountain will not be liable for road, sidewalk repairs or
any other surface improvement repairs necessitated by any water operation
or water maintenance activity.
Mobile home parks shall be master metered, unless the park has been
subdivided and lots are individually owned then they shall be treated the
same as single family subdivisions.
Meter Tvoes & Sizes
The size and type of water meter shall be reviewed by the Public Works
Department based on type of facility receiving service, projected peak
water demand, and expected fluctuation in water demand, and shall be
selected to insure high standards for accuracy for all service conditions.
The size shall be the smallest, which is designed for a normal test flow rate
covering both the minimum and maximum flow rates expected by the
customer.
Non -single family residential peak water demands shall be calculated
using the fixture unit values and demand curves shown in Figures W03-
b,W03-c, W03-d & W03-e found on pages W-12 & W-13 of these
Standards.
These Figures are taken from the "Rules Governing Public Water
Systems" T15A NCAC18C.0802 as published by the North Carolina
Division of Environmental Health / Public Water Supply Section. An
accepted alternative to this peak demand calculation is the fixture unit
assignment and gallons per minute calculations included in Appendix E of
the North Carolina Plumbing Code (latest revision).
Water meters from 5/8-inch to 2-inch in size shall be positive displacement
meters as specified by AWWA C700 and shall be provided by the Public
Works Department. Water meters greater than 2" shall be lead free
compound type (AWWA C702) except as follows: where combination fire
KR

and domestic meters (AWWA C703) are approved or at locations where
Class II turbine type meters (AWWA C701) are approved in writing by the
Director. The Director's authorization of turbine meters shall be limited to
those premises where intervals of water demand at a rate lower than the
lower limit of the normal test flow rate of the meter for its size, as defined
by AWWA C701, is highly improbable. Full size dedicated fireline meters
shall be turbine meters complying with AWWA C703.
Figure W08-e: Water Meter Sizing Table
COMPOUND METERS
Nominal Meter Size Safe
Maximum Operating (inches)
Capa ( gpm)
320
500
1000
POSITIVE
DISPLACEMENT
METERS
Nominal Meter Size Safe Maximum Operating
(inches) Capa (gpm)
5/8 15
3/4 30
1 50
1Y2 100
2 160
36

D. Pro -read Registers and Remote Reading Pads
All water meters in vaults and all detector meters located on backflow
preventers, located either in a vault or inside the building shall be furnished
with remote reading capabilities compatible with Town meter reading
equipment.
Combination fire and domestic water meters shall be furnished with Town -
compatible remote reading capabilities meter reading equipment on both
the turbine and by-pass meters.
(Accuracy performance will conform Ltrictly to -current AWWA standards -as _ _ _ _ _ _ _ _ _ , - Commented PTI5]: ???
well as all loss of head requirements.
E. Materials for Services
General: All new brass water service fitting, in direct contact with
water, shall be made of a "No -Lead Brass", defined for this
specification as EnviroBrass II, UNS Copper Alloy C89520 per ASTM
B30 and ASTM B584 or approved equal. The Mechanical properties
and Chemical composition of the "No -Lead Brass" Alloy shall be
certified by an independent testing agency. This "No -Lead Brass" alloy
shall contain not more than one fourth of one percent (0.25% or less)
total lead content by weight.
All brass fittings and valves shall have the manufacturers name or
trademark integrally stamped or cast on it. Another marking identifying
the "no lead" brass alloy, e.g., `EB2' or "NU, shall be cast or stamped
on the fitting or valve.
The only exception to this requirement is for brass unions, brass
nipples, brass bushings and brass bell couplings which shall be made of
85-5-5-5 brass as defined for this specification as UNS Copper Alloy
C83600 per ASTM B30, ASTM B62, ASTM B584 and AWWA C-
800.
All brass fittings and valves shall be certified by an ANSI accredited
test lab per ANSUNSF Standard 61, Drinking Water Components —
Health Effects, Section 8. Proof of certification is required
The use of galvanized iron, steel, or plastic fittings with copper and
other higher -grade specified materials shall not be permitted or
accepted in water service connections.
All service line fittings shall be designed for connection to the service
line by compression. No solder, brazing and flaring connections will be
allowed.
37

2. Copper Service Tubing: Shall be type K soft copper tubing per ASTM
B88 for service lines. The longest available length of service line
should be used with no unions. As an example for a 3/4-inch service
connection, no union shall be used in the installation of 60 feet or less.
3. Tapping Saddles
The Contractor shall furnish and install iron body double strap service
saddles complying with the following:
Bodies: Ductile Iron ASTM-A536
Straps: 5/8-inch AISI C 10 10 Steel, Zinc plated with Di -chromate seal.
Nuts: Cold formed heavy hex steel A563, electro-galvanized with
dichromate seal. Gasket: Buna-N rubber, ASTM-D2000
Finish: Shop Coat Enamel
4. Ball Valve Corporation Stops The ball valve corporation stops shall
have a PTFE coating approved for use in potable water and be
supported by two Buna-N rubber seals that are held and sealed in place
with adhesive. The operating stem shall have a head that clearly
indicates the flow direction. The stem shall be equipped with an O-ring
seal to assure against external leakage and a flange to prevent blowout.
All Ball valve corporation stops shall be designed to have a working
pressure of 300 PSI. The throughway dimension shall be no smaller
than the nominal size of the valve. All ball corporation stops must be
designed so they can be installed under pressure with standard tapping
machines and insertion tools. All threads shall conform to the current
AWWA C-800 standard. Inlet threads shall be either AWWA or iron
pipe style.
5. Curb Stops: Curb stop shall be the ball valve type with a padlock wing.
The valves internal components shall be removable from the top of the
valve body. The Curb Stops shall be designed to receive the service
pipe connection with straight coupling nut on the street side and on
iron pipe thread connection on the opposite side
6. Dual Check Valve. An in -line dual check valve with independent
acting checks shall be used downstream of the water meter. The check
valve shall have a meter -coupling inlet and shall be contained inside
the box. The internal parts of the check valve shall be removable
without disconnecting the check valve or the outlet piping.
7. Meter Yoke. The yoke shall include a threaded expansion wheel on the
inlet side to the water meter and a smooth machined brass surface on
the outlet side to compress a meter washer into the dual check inlet
rated for 250 PSI; tightening lugs shall extend from the wheel to allow
easy access
38

8. Meter Boxes for 5/8-inch services shall be of round style and made of
Polyvinyl Chloride Plastic with a minimum wall thickness of 0.375
inches. The box shall be sized to accept a 5/8 and 3/4-inch water meters
and shall have a minimum inside diameter of 18 inches with a 30-inch
depth. The box shall have a non -locking cast iron lid. Lid & box must
comply with the requirements depicted in standard detail W.01.
9. Meter boxes for 1-inch 1-1/2 & 2-inch service: Shall be a galvanized
steel vault and conform to the Town of Black Mountain Standard
Details for the corresponding meter size. Piping shall be constructed
from brass and copper tubing and shall be equipped with a
manufactured setter assembly with a lockable angled check valve
outlets and by-pass lockable flanged valve or by-pass lockable flanged
ball valve inlets.
Meter Vaults for Meters 3-inch and Larger: Meters shall conform to
the Town of Black Mountain Standard Details for 3-inch and larger
meters. These vaults are constructed by a Licensed Utility Contractor
for the Owner/Developer for the approval by Public Works. Meter
Vaults shall be located off the street right of way and outside of travel
areas. The access door shall be aluminum with a flush drop lift handle,
stainless steel hinges and bolts, a stainless steel slam lock, an automatic
hold open arm, and compression springs to allow for easy opening. All
vaults shall be provided with remote reading capabilities compatible
with Town meter reading equipment as per the applicable detail.
A drain to atmosphere shall be provided dedicated solely to draining
water from the pit. The drain to daylight shall be minimum 6-inch
diameter pipe; as an alternate, the outlet may discharge to a drainage
structure at a minimum of 6 inches from the bottom of the structure.
All drain outlets shall be provided with a flapper valve. In the event
that no practical discharge point is available, a sump pump may be
used subject to Public Works approval. The owner shall be responsible
for providing power to the sump pump and all utility costs associated
with its continuous operation. The pump may be located in an outside
`well' or manhole, or in the vault for the backflow prevention
assembly, and shall be maintained by the owner. Sump pumps are not
allowed to be installed within the water meter vault.
See the Water Service Connections Technical Specifications for more
information regarding standard components of new water service connections,
and the Approved Manufacturers Products List. , , - fCommented PT76]: ??
BACKFLOW PREVENTION
39

A. General
Backflow prevention assemblies are required on all water service
connections with the exception of single family or duplex residential units.
The type of backflow prevention assembly required is determined by the
degree of hazard of the water customer. See the Cross Connection Control
Policy for determination of degree of hazard and specific backflow
requirements. The approved waterline extension plans shall clearly indicate
which type of backflow prevention assembly is required.
Backflow prevention assemblies shall be installed, tested, and maintained
by the customer as required by the Cross Connection Control Policy.
Where normal operating pressures exceed175 PSI, a pressure reducing
valve shall be installed upstream of required backflow prevention
assemblies. This pressure reducing valve shall be owned and maintained
by the customer.
The backflow assembly shall be tested for proper operation at the time of
installation and annually thereafter in accordance to the Cross Connection
Control Policy.
Backflow assemblies with detector by-pass lines shall include a backflow
prevention assembly of the same type as the larger, based on hazard
classification and manufacturer.
All Reduced Pressure Principle Assemblies shall have a swing check valve
immediately before the assembly, as a minimum.
All pressure reducing valves (PRVs) or swing check valves on fire line
systems must be UL/FM approved.
All backflow prevention installations on fire lines, except Reduced
Pressure Principle Assemblies, require execution of a Sprinkler System
Certification to be submitted prior to testing of the assembly and final
inspection.
B. Location of Assembly
The required backflow prevention assembly shall be installed on the
plumbing line on the customer's side of the water meter and before any
branching of the waterline occurs. The backflow prevention assembly
shall be installed in a pit or in an above -ground heated insulated enclosure,
depending on device type. Backflow prevention assemblies shall be
installed within 15 feet of the meter box or adjacent to the right-of-way
line for non metered service lines. In special cases the backflow assembly
can be located greater than 15 feet from the meter or right-of-way line or
inside a building as outlined in the Cross Connection Control Policy.
Public Works Department must grant a variance for alternate location of
40

the device and at a minimum the Developer is required to execute an
Estoppel Certificate provided by the Public Works Department that
outlines the conditions for variance.
C. Installation Requirements
For assemblies installed in a below ground vault, double check backflow
assemblies only, a minimum of 12 inches of free clearance or separation
shall be provided on all sides and between the bottom of the vault and the
lowest point of the backflow assembly.
In addition, a drain to atmosphere shall be provided dedicated solely to
draining water from the pit. The drain to daylight shall be minimum 6-inch
diameter pipe; as an alternate, the outlet may discharge to a drainage
structure at a minimum of 6 inches from the bottom of the structure. All
drain outlets shall be provided with a flapper valve. hi the event that no
practical discharge point is available, a sump pump may be used subject to
Public Works approval. The owner shall be responsible for providing
power to the sump pump and all utility costs associated with its continuous
operation. The pump may be located in an outside `well' or manhole, or in
the vault for the backflow prevention assembly, and shall be maintained by
the owner.
Reduced pressure zone backflow assemblies are required to be installed in
above ground enclosures or rooms (within a building), and must also be
provided with a drain and protected from freezing. The top of the drain
shall be located a minimum of 1 inch or two times the size of the relief
outlet, whichever is greater, directly below the relief port of the assembly.
The drain pipe shall be a minimum of 2 inches in diameter or two times the
size of the relief outlet, whichever is greater. A minimum of 12 inches of
free clearance or separation shall be provided between the floor slab and
the lowest point of the backflow assembly.
See the Town of Black Mountain Standard Details for Above, Below and
Inside Building Backflows/Enclosures, for additional details of backflow
assembly installations.
Figure W07-a: General Guidelines for Backflow Location and Installation
Degree of
Type of
Type of
Size of
Location
Installation Requirements
Hazard
Service
Backflow
Device
Requirements
Prevention
Device
Moderate
Domestic
Double Check
5/8" to
Within 15 feet of
Below ground in a large meter box or
Assembly
2"
the water meter.
above ground heated insulated
enclosure.
Moderate
Domestic
Double Check
2 V' &
Within 15 feet of
Below ground in a precast drainable
Assembly
above
the water meter.
pit or above ground heated insulated
enclosure.
41

High
Domestic/
Reduced
5/8" &
Within 15 feet of
Above ground insulated enclosure
Irrigation
Pressure Zone
above
the water meter.
only. Horizontal installation only.
Assembly
Moderate
Fire, no FDC
Double Check
2" &
Adjacent to road
Below ground in a precast drainable
(un-metered)
Detector
above
right-of-way.
pit or above ground heated insulated
Assembly
enclosure.
Moderate
Fire, no FDC
Double
2" &
Within 15 feet of
Below ground in a precast drainable
(metered)
Check
above
the water meter.
pit or above ground heated insulated
Assembly
enclosure.
High
Fire
Reduced
2" &
Adjacent to road
Above ground heated insulated
(un-metered)
Pressure Zone
above
right-of-way.
enclosure only. Horizontal installation
Detector
only.
Assembly
High
Fire
Reduced
2" &
Within 15 feet of
Above ground heated insulated
(metered)
Pressure Zone
above
the water meter.
enclosure only. Horizontal installation
Assembly
only.

WATER BOOSTER PUMP STATIONS
A. General
Where required to provide minimum flow and pressure requirements,
water booster pumping stations shall be constructed in accordance with the
Technical Specification for Package Water Booster Pumping Station for
Town of Black Mountain ownership and maintenance.
All new water system extensions requiring a booster pumping station will
require payment of a "Pump Station Maintenance Fee" prior to granting
final plan approval. The amount of the maintenance fee shall be as
specified by the Director. The Engineer of Record shall provide a cost
schedule for the pump station including all components, back-up power
generator, skid equipment, SCADA, fencing, utilities, etc.
Except as specifically approved otherwise in writing by Director, pumping
units shall not cause drop in suction pressures greater than 20 PSI between
operating and stopped condition, increase the discharge pressures greater
than 25 PSI between operating and stopped condition, and shall not cause
service pressure at any meter in water distribution system under peak
demand conditions to drop below 40 PSI or increase above 200 PSI under
static condition.
Guidelines used by the Public Works Department in developing these
requirements include the following: (1) each pump flow rate shall be
capable of filling the associated storage reservoir with maximum pumping
cycle of 8 hours per day (2) satisfy peak demand projections with
minimum 40 PSI residual at all points in the Water Distribution System;
(3) satisfy projected average day demand coincident with fire flow demand
with minimum 20 PSI residual at all points in the Water Distribution
System, with 25% of the reservoir volume conserved at the end of the fire
demand period if the reservoir was full when the fire demand began; (4)
maximum residual static pressure at any point in the Water Distribution
System not in excess of 175 PSI with booster pump off, and no increase in
pressure beyond 25 PSI at any point between pump on and pump off
condition; and (5) calculated complete water turnover in the boosted area
of the Water Distribution System at 85% of build -out within 5 calendar
days or less under average day demand conditions.
B. Pump Design
The Engineer of record shall determine the pumping capa and a total
dynamic head of the pumping units based on the specific elevation
requirements, storage availability, pipe head loss calculations, acceptable
pressure range for all customer service connections, average demand with
fire flow required, peak demand and maximum tank filling pumping cycle
43

as specified above. Calculations shall be submitted as required in the
section in this manual for DESIGN REPORT under procedures for
extending water system and obtaining service.
C. Building or Enclosure
1. Pump station shall be designed for ground level entry to pumping units,
internal piping and accessories, and electrical switch -gear and
controls, through a standard doorway.
Access designed for confined space entry will not be acceptable.
Building or enclosure shall be a low maintenance material such as
brick veneer, concrete, decorative concrete or masonry block.
2. Overhead beam and crane shall be provided if weight of pump
assembly exceeds 150 pounds.
3. Factory built package units meeting the requirements of the Technical
Specification for Package Water Booster Pumping Station are required
by these Standards.
4. Exterior architectural features and landscaping may be designed to "fit
into' the theme of surrounding properties, subject to this Manual and
approval by the Public Works Department.
D. Site Improvements/Access
An all-weather roadway access, at least 12 feet in width, with a grade of no
more than 15% shall be provided for all booster pumping station and
ground water storage tank sites. At a minimum, said road access shall be
designed to provide minimum horizontal radii of 40 feet and no less than 8
inches of compacted aggregate base (CABC) as a riding surface. Larger
radii and bituminous concrete asphalt riding surface will be required for
slopes exceeding 12%. Adequate road drainage shall be included to protect
the integrity of the access roadway.
Site improvements shall be such to provide a clearance of between 8 to 10
feet between the building and other site features. In addition, sufficient
parking area shall be provided to allow parking and maneuvering of a
heavy duty utility pickup truck completely off the main access road.
Landscaping shall be in compliance with the Town of Black Mountain
ordinances and requirements, and shall incorporate low maintenance
concepts to the greatest extentpossible.
Security fencing 6 feet high with additional minimum three barbed wire
strands and double leaf gate access, dead bolt door locks, or equivalent
access security shall be provided. Fence location shall be such to prevent
intrusion to site and any liability associated with potential falls within sites
located adjacent to steep cut slopes. Fencing will be required all around the
44

property to be deeded to the Town of Black Mountain, unless topographic
site conditions make it unfeasible to comply with this requirement. In these
cases, fencing requirements will be determined on a case by case basis.
E. Equipment Components
Refer to the Technical Specification for Package Water Booster Pumping
Station, for pump and equipment components.
F. Emergency Accessories
Standard fire hydrants shall be installed immediately outside of pump
station on both suction and discharge side of pumps, not to exceed 20 feet
apart, to permit portable pump to hook up for alternate pumping in the
event of an emergency. Hydrants shall be aligned respectively on the
suction and discharge sides of the pump station at accessible locations to
street or driveway.
G. Electrical Power Service
Power must be three phase at the required voltage for the pumps. In those
areas where 3- phase power extension is deemed to be economically
unfeasible, as evidenced by a quote from the power company and
determined by the Public Works Department, variable frequency drives
(VFD's) can be utilized in lieu of 3-phase power for motors less than 10
hp. The use of Roto phase converters is not acceptable.
H. Back-up Power Supp
A Natural Gas or Propane powered, commercial heavy duty generator,
sized to operate all electrical needs of the booster pumping station, shall be
provided as back-up power supply for every pumping station. The
generator is to be liquid cooled and is to conform to the Approved
Manufacturers Products List for generators. The propane tank capa shall be
no less than 7 day supply for normal operation of the pumping station,
rounded to the nearest available commercial capa. If natural gas is
available within 500 feet of the developing property's limits, the gas line
shall be extended to supply the back-up generator.
I. Operation and Maintenance Manuals
When construction of a Water Distribution System extension includes the
construction of a booster pump station, water storage reservoir, and/or
pump station instrumentation, the developer shall submit prior to receiving
a Letter of Acceptance from Public Works 3 copies of thorough operation
and maintenance data on the pumps and appurtenances, reservoir,
instruments, PLC/RTU and appurtenances, schematic and ladder diagrams
of all programmable controls and as -built panel drawings in hard copy and
45

digital AutoCAD format.
WATER STORAGE RESERVOIRS
A. General
Water pumping stations shall pump to atmospheric ground level water
storage reservoirs unless approved otherwise by the Director. Storage
tank capa for residential subdivisions shall be 30,000 gallons plus
domestic demand equal to 1 day storage, estimated at 400 gallons per
day per dwelling. Additional storage volume may be required for other
type of developments in accordance with the North Carolina Fire
Prevention Code, local fire department regulations and as otherwise
required by the Director.
Ground level water storage reservoirs must be cited on the highest
available suitable ground such that at all connections to the Water
Distribution System served by gravity from the reservoir maintain a
residual water pressure under peak demand conditions of 40 PSI or
greater and 20 PSI minimum under fire flow conditions with the water
level at half the capa of the reservoir. The will not assume any
responsibility to provide domestic and/or fire protection services above
the maximum hydraulic grade line of the new pump/tank system.
See the Glass -Coated, Bolted -Steel Potable Water Storage Tank and
the Prestressed Concrete Storage Tank Technical Specifications for
more detailed reservoir specifications.
1. Materials: All ground level water storage reservoirs shall be
circular pre -stressed concrete water storage reservoirs meeting all
specifications of AWWA Standard D110, latest edition, or glass -
fused —to steel, lap sealed joint, bolted steel tanks with aluminum
geodesic dome roofs or clear -span and self-supporting radially
sectioned roof (rolled knuckle design) fabricated from glass -coated,
bolted steel panels. Tanks must be compliant with the requirements
of AWWA D 103, D-104 NSF, ISO 9001 and be FM approved.
All reservoirs shall be structurally designed to meet all
requirements of the appropriate AWWA Standard and shall be
sealed by a Registered Professional Engineer experienced in
structural design.
Access and Site Improvements: All weather access roads shall be
provided to all storage reservoir locations. Reservoir access roads
shall have a minimum width of 12 feet and a maximum slope of
15%. At a minimum, said road access shall have a horizontal radii
of 40 feet and no less than 8-inches of compacted aggregate base

(CABC) as a riding surface. Larger radii and bituminous concrete
asphalt riding surface will be required for slopes exceeding 12%.
Adequate road drainage shall be included to protect the integrity of
the access roadway.
Site improvements shall be such to provide a clearance of a
minimum 10 feet all around the storage tank. In addition, sufficient
parking area shall be provided to allow parking and maneuvering of
at least one heavy duty utility pickup truck completely off the main
access road. Landscaping shall be in compliance with the Town of
Black Mountain ordinances and requirements, and shall incorporate
lowmaintenance concepts to the greatest extent possible.
3. Site fencing: Security fencing 6 feet high with additional minimum
three barbed wire strands and double leaf gate access, dead bolt
door locks, or equivalent access security shall be provided.
B. Tank accessories:
1. Overflow: An overflow pipe, sized to prevent water levels inside the
reservoir from exceeding 6" above the overflow lip in the event the
supplying pump fails to cut off under zero service demand conditions,
shall be secured on the interior to the tank shell with suitable brackets
at appropriate intervals. The top lip of the overflow piping shall be set
at the elevation intended for full reservoir storage. Pipe shall be steel
with flanged connections for diameter 4 inches or greater and threaded
connections for smaller than 4 inches. The end of the overflow pipe
shall be covered with a flap valve and shall discharge over a drainage
inlet structure or a splash block. Disposal of the chlorinated solution
during overflow shall comply with all federal, state, and local
regulations. Approved Energy dissipaters shall be installed at all
discharge points, away from developed areas, and shall be properly
sized to ensure that overflow is released at a non -erosive velo.
2 Ultrasonic Level Sensor and Transducer: A tank level transmitter will
be provided. Please see the SCADA Instrumentation & Control
Technical Specifications. The sensor shall read the entire span of the
tank in feet of water. The mounting location for the transducer must be
reachable from the tank ladder landing area, and be a minimum of 90
degrees from the end of fill line location.
3. Sampling Station: A sampling station shall be provided on the draw
line for every water storage tank. The sampling station shall be similar
to a standard single meter service and shall include a standard 3/4"
service saddle, corporation stop, %" copper pipe and ball valve. The
ball valve and the terminus of the copper pipe shall be housed within a
standard water meter box with lid.
47

SCADA INSTRUMENTATION:
A. General:
SCADA systems shall be provided for the remote operation and
monitoring of pumping stations, water storage reservoirs, control valves,
pressure regulating or reducing valves and flow monitoring stations. The
control system will utilize a SCADA Control Panel (RTU) in connection
with a Communication Control Panel. Data will be communicated via
leased telephone lines to and from the North Fork Water Treatment Plant.
Refer to the SCADA Instrumentation & Control Technical Specifications
for details and requirements of the instrumentation control system.