Project Information

Bid Title

2025 DIXON WTP SOFTENER TANK REHABILITATION PROJECT

Issuing Agency

Onslow Water and Sewer Authority

Location

North Carolina

Published Date

Dec 1, 2025

Closing Date

Jan 5, 2026

Government Level

State & Local

Status

Closed

Original Source

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Bid Documents

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Project Description

Bid Title:	2025 DIXON WTP SOFTENER TANK REHABILITATION PROJECT
Category:	Construction Services
Status:	Open

Description: The Onslow Water and Sewer Authority 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 January 5, 2026 . The successful proposer 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. NC Certified HUB Contractors are encouraged to submit proposals for all bidding opportunities at ONWASA. For more details, see the Request for Proposals under "Related Documents" below. Addendum 1 posted 11/12/2025. Addendum 2 posted 12/1/2025. Publication Date/Time: 10/21/2025 12:00 AM Closing Date/Time: 1/5/2026 2:00 PM Addendum Date/Time: 11/12/2025 Pre-bid Meeting: 11/25/2025 @ 2:00 PM Contact Person: For Proposal Submittal: Eric Adams, Chief Financial Officer eadams@onwasa.com For Technical Questions on the work required for this project: Jim McDonnel jmcdonnel@onwasa.com Special Requirements: 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. Related Documents: 2025 Dixon Softener Rehab RFP 2025 Dixon Softener Rehab Addendum 1 2025 Dixon Softener Rehab Addendum 2

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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

Commodity Codes

• NAICS 237110Water and Sewer Line and Related Structures Construction

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