2025 DIXON WTP SOFTENER TANK REHABILITATION PROJECT
| Location: | North Carolina |
|---|---|
| Posted: | Nov 12, 2025 |
| Due: | Dec 2, 2025 |
| Agency: | Onslow Water and Sewer Authority |
| Type of Government: | State & Local |
| Category: |
|
| Publication URL: | To access bid details, please log in. |
| Bid Title: |
2025 DIXON WTP SOFTENER TANK REHABILITATION PROJECT
|
| Category: | Construction Services |
| Status: | Open |
|
Attachment Preview
onwasa.com
228 Georgetown Rd
Jacksonville, NC 28540
INFORMAL REQUEST FOR PROPOSAL (RFP)
DIXON WATER TREATMENT PLANT
SOFTENER TANK REHABILITATION PROJECT
OCTOBER 21, 2025
The Onslow Water and Sewer Authority (hereinafter referred to as ONWASA) requests proposals for the
completion of a softener tank rehabilitation at our Dixon Water Treatment Plant. Proposals will be
received at the ONWASA Central Office Complex at 228 Georgetown Road, Jacksonville, NC 28540 until
2:00 pm on November 18, 2025.
The successful proposer (hereinafter referred to as “Contractor”) shall furnish all permits, materials,
equipment, and labor necessary to perform all tasks described in the Scope of Work, including: removing
and disposing of existing media; performing a visual inspection of the tank and repairing defective areas
(including spot and patch welding) as needed; preparing and painting interior and exterior surfaces;
pressure testing; replacement of brine inlet valve and electronic actuator; and, installing new gravel and
media in a total of one (1) steel tank softener vessel. Work will be performed at ONWASA’s Dixon Water
Treatment Plant, 6661 Wilmington Hwy, Holly Ridge, NC 28445. Work is to begin within seven (7) calendar
days from the receipt of a Notice to Proceed, and all work on the project shall be completed and the tank
ready for service within 30 calendar days from that date.
The Request for Proposal is available at www.onwasa.com, by calling Eric Adams at (910) 937-7545, or by
e-mail request made to eadams@onwasa.com. Technical questions related to this Request for Proposal
shall be addressed to Seth Brown, Deputy Chief Operations Officer (Treatment ORC) at 910-937-7520, or
by e-mail to sbrown@onwasa.com.
An optional pre-proposal site visit for prospective contractors will be held at 2:00 PM on November 10,
2025, at the Dixon Water Treatment Plant, 6661 Wilmington Highway, Holly Ridge, North Carolina,
28445.
Contractors submitting a proposal are hereby notified that NC General Statutes relating to the licensing
of contractors will be observed in receiving proposals and awarding of a contract. Performance and
Payment Bonds are required for this Project.
The use of subcontractors is subject to ONWASA approval.
ONWASA reserves the right to reject any or all proposals, to waive informalities, and to accept any
proposal which, in the opinion of ONWASA, appears to be in its best interest. The right is reserved to hold
any or all proposals for ninety (90) days from the opening thereof.
SCOPE OF WORK
DIXON WATER TREATMENT PLANT
SOFTENER TANK REHABILITATION PROJECT
The Contractor shall provide all labor, equipment, and materials necessary to: remove and dispose of
existing media; perform a visual inspection of the tank and repair defective areas (including spot and patch
welding) as needed; prepare and paint interior and exterior surfaces; pressure test; replace the brine inlet
valve and electronic actuator; and install new gravel and media in a total of one (1) steel tank softener
vessel. All work is to be performed at the Dixon Water Treatment Plant, 6661 Wilmington Hwy, Holly
Ridge, NC 28445.
For informational purposes, the attached drawing illustrates approximate tank dimensions and layout.
All work on this project shall conform to the following requirements:
1) GENERAL REQUIREMENTS
a) Work shall be performed following all applicable state and local codes and regulations
governing this project.
b) The contractor shall be responsible for securing and paying for all permits required to
complete the project.
c) ONWASA shall provide access to an on-site potable water source (hydrant) for use during the
work.
d) Access to the plant is restricted, so work schedules and material deliveries must be
coordinated in advance with the plant operator to ensure adequate access and
avoid/minimize impacts to water production activities.
e) Conduct operations in such a manner as to avoid damage to other site facilities (controls,
building, security gate and fencing, etc.) Any such damage shall be repaired by the Contractor
at no additional cost to ONWASA.
2) SOFTENER MEDIA REMOVAL AND DISPOSAL
a) Empty and vacuum clean one (1) steel softener tank (9 ft. 6 in. straight shell by 12 ft. OD) of all
existing softener and gravel media.
b) All removed media shall be hauled and disposed of off-site by the Contractor.
c) ONWASA will provide to the Contractor AS w/ TCLP analysis (Exhibit D) and/or MSDS sheets for
the media, as required by the landfill, before disposal. Attached at the end of the Scope of Work.
3) TANK PREPARATION AND COATING
a) Pressure wash tank interiors and remove any remaining debris.
b) Remove the existing 4” PVC brine inlet valve and electronic actuator and replace them with like
kind. Wiring and testing of the replacement actuator and brine inlet valve shall be the
responsibility of the contractor. Testing of the actuator shall be conducted in front of ONWASA
personnel prior to ball valve installation.
c) Inspect interior components (underdrain system, surface wash equipment, inlet distributor/brine
distributor, air scour equipment, wash water troughs, etc.) and advise ONWASA of any
deficiencies discovered before proceeding. Underdrain repairs are not a part of the Scope of
Work.
d) Sandblast tank interiors to SSPC-SP10/NACE 2 Near White Metal condition.
e) Perform a visual inspection of the tank and spot weld or weld patches over defective areas as
needed. Spot welds, welding burn through, or welded patches on the exterior will require
preparation and application of a two-part epoxy coating certified for potable water service
(Tnemec Pota-Pox series or equivalent) following the manufacturer’s requirements for application
and curing to the full exterior of the vessel once welding is completed.
f) Apply Tnemec series 215 (or equivalent) surfacing epoxy following the manufacturer’s
requirements for application and curing to the interior tank wall from the concrete fill to 30” up
the side wall.
g) Apply a two-part epoxy coating certified for potable water service (Tnemec Pota-Pox series or
equivalent) following the manufacturer’s requirements for application and curing. The coating
thickness is as follows:
o First coat 6.0 – 8.0 dry mils
o Stripe coat 3.0 - 5.0 dry mils
o Second coat 6.0 - 8.0 dry mils
h) Provide an inspection by the epoxy coating manufacturer to verify proper application before tank
integrity testing.
i) Provide detailed photos of the interior of the vessel after sandblasting is complete and after the
coating is applied.
4) TANK INTEGRITY TESTING
a) Once the interior coating has fully cured, and before placing new media, the Contractor shall
install a new manway gasket, fill each tank, pressurize to 35 psi, and inspect for leaks.
b) Any leaks found shall be repaired in accordance with Item 3e (spot welding and/or welded
patches).
c) Locations where repairs were made after interior coating shall be photographed, inspected,
surface-prepared, and recoated following the coating manufacturer’s requirements.
d) After curing of the repair coating, tank(s) shall be retested for leaks following Item 4a to verify
the successful completion of repairs.
5) GRAVEL AND SOFTENER RESIN REPLACEMENT
a) The contractor shall furnish and install graded gravel bed material in a way to prevent damage to
the interior coating and in accordance with the tank manufacturer’s requirements.
b) Gravel bed Material Requirements (Quantity shown is for one (1) softener):
Gradation
1 ½ x ¾ gravel
¾ x ½ gravel
½ x ¼ gravel
¼ x 1/8 gravel
1/8 x 1/16 gravel (6 x #14)
Quantity (Cubic Ft.)
45
14
14
28
28
c) Upon completion of gravel bed installation, the Contractor shall install ion exchange resin media
following tank manufacturer and resin manufacturer recommendations. Media shall be supplied
by ONWASA or by the Contractor, depending on the Contract awarded.
d) Resin Media Requirements (Quantity Shown is for one (1) softener):
Media
Purolite C100E
Quantity (Cubic Ft.)
509
e) After all resin is installed, ready the tank for service.
f) Clean up all debris, surplus equipment, and materials and remove them from the site.
g) Note: Contractor shall verify all material quantities before ordering.
6) WARRANTIES
a) Contractor shall warranty repairs for no less than (90) days for workmanship and provide the
full manufacturer’s warranty period on materials.
7) ADDITIONAL REPAIRS (IF NECESSARY)
a) Inlet Distributor/Brine Distributor Replacement
i) Remove existing inlet/brine distributor.
ii) Furnish and install a new stainless-steel butt-welded distributor.
b) Concrete Repair
i) Chip out the concrete 6” below the existing surface and blast area.
ii) Epoxy-fill pitted holes in the tank wall and coat the blasted area with Belzona 1111 (or
equivalent).
iii) Apply Tnemec series 215 (or equivalent) surfacing epoxy by the manufacturer’s
requirements for application and curing to the interior tank wall to 30” up the side wall.
iv) Patch the concrete floor and seal with Belzona 5812 (or equivalent).
c) Concrete Replacement
i) Jackhammer all concrete out of the softener vessel.
ii) Remove the drain system.
iii) Sandblast the surface that was below the concrete.
iv) Coat heavily pitted areas in metal with Belzona 1111 (or equivalent) from 6” below the
concrete to 12” above the concrete.
v) Reinstall concrete with a concrete pump.
vi) Seal concrete with Belzona 5812 (or equivalent).
vii) Install a new drain system.
For the purpose of preparing and submitting a proposal, the Contractor shall provide a separate
lump sum price for each of the following items:
• Price to complete all items of work (1 through #6) with all Softener Media (Resin) supplied by
ONWASA and installed by the Contractor.
• Price to complete all items of work (#1 through #6) with all Softener Media (Resin) supplied
and installed by the Contractor.
• Price to complete individual Additional Repair Items #7a - 7c, if necessary.
END OF SCOPE OF WORK
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