Unofficial Notice of Invitation to Bid (NIB)

Antioch City is seeking bids from qualified and interested contractors for the following project titled, DIVING SERVICES FOR WATER TANK AND FISH SCREEN MAINTENANCE AND ASSESSMENT, identified under Solicitation ID: 733. Work is to be performed near 1201 W 4th St, Antioch, CA 94509, USA in Contra Costa County.

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General Project Description

The City of Antioch seeks a qualified contractor to provide comprehensive diving services for the inspection, cleaning, and condition assessment of potable water storage facilities (10 tanks, 2 clearwells) and submerged fish screens within the City. The scope includes both scheduled maintenance and on-call service requests (responding within one week), mobilization and dive equipment setup, inspection and clearing of materials from intake screens/tank bottoms, underwater inspection with simultaneous video recording (including voice narration and still image capture), site clean-up, and demobilization. Tank assessments will focus on the condition of interior/exterior coating systems, corrosion levels (visual, DFT, adhesion, pit depth/ultrasonic testing), and structural elements like roofs, shells, piping, vents, ladders, platforms, and cathodic protection systems, adhering to AWWA C652 sanitary procedures. Key deliverables include detailed assessment reports with recommendations for coatings, cathodic protection, and structural repairs.

General Bid Items

Quantity: LS Unit: LS Work Item: Provide scheduled and on-call diving services for water tanks and fish screens as per Scope of Work.
Quantity: LS Unit: LS Work Item: Furnish all labor, materials, equipment, and consumables required for diving operations.
Quantity: LS Unit: LS Work Item: Mobilize and demobilize dive trailer and equipment to project sites.
Quantity: LS Unit: LS Work Item: Set up dive system after obtaining site access and confirming Lockout/Tagout (LOTO) procedures.
Quantity: LS Unit: LS Work Item: Inspect and clear material from submerged intake screens (approx. 48 inches wide x 16 feet long) and tank bottoms.
Quantity: LS Unit: LS Work Item: Maintain all diving equipment to industry standards and OSHA requirements.
Quantity: LS Unit: LS Work Item: Perform underwater inspection with simultaneous video recording, voice narration, and real-time viewing capabilities.
Quantity: LS Unit: LS Work Item: Provide video recording system capable of capturing color still images, indexing, sorting, and detailing specific video portions.
Quantity: LS Unit: LS Work Item: Conduct comprehensive potable water tank assessments including internal and external surface surveys.
Quantity: LS Unit: LS Work Item: Evaluate coating systems (interior and exterior) for current condition, corrosion levels, and integrity.
Quantity: LS Unit: LS Work Item: Perform visual observations, dry film thickness (DFT) measurements, adhesion testing, and potentially corrosion pit depth/ultrasonic (UT) testing on tanks.
Quantity: LS Unit: LS Work Item: Conduct detailed inspections of critical tank areas: Roof, Roof Structure Shell, Tank Bottom, Overflow Pipe/Weir, Drains/Sumps Inlets/Outlets, Piping, Vents/Screens, Shell and Roof Chine/Joints, Weld or Bolt Connections, Ladders/Safety Climbs, Vandal Deterrents, Platforms/Railings, Manways Hatches Gaskets, Ringwall/Anchor Bolts, Grade/Tank Crevices, and Water Level Indicators.
Quantity: LS Unit: LS Work Item: Assess Cathodic Protection (CP) Equipment/Components.
Quantity: LS Unit: LS Work Item: Compile a written narrative and color pictorial assessment report for each potable water tank.
Quantity: LS Unit: LS Work Item: Provide specific recommendations for coatings, cathodic protection, and structural considerations based on corrosion levels and tank condition.
Quantity: LS Unit: LS Work Item: Provide a narrated video of the interior inspection for inspected tanks.
Quantity: LS Unit: LS Work Item: Perform site clean-up and demobilization, including removal of temporary facilities, construction materials, debris, and waste.

NAICS Classification

NAICS 561990 – All Other Support Services, NAICS 237110 – Water and Sewer Line and Related Structures Construction, NAICS 541330 – Engineering Services, NAICS 238910 – Site Preparation Contractors

Records and Due Date

This bid opportunity was entered into BidAmerica on December 22, 2025, and was last updated on December 19, 2025. All bids and/or proposals are due on January 21, 2026.

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Legal Disclaimer

All bidders are responsible for reviewing and verifying all official bid documentation directly from the issuing agency. BidAmerica aggregates public bid information for advertisement purposes for contractors and government agencies convenience. This Notice of Invitation to Bid is for reference purposes only and is not an official or complete representation of any documents issued by Antioch City. BidAmerica does not guarantee the accuracy, completeness, or timeliness of any information displayed and shall not be held liable for any errors, omissions, misinterpretations, or damages resulting from reliance on this summary. Contractors must obtain all official information—including plans, specifications, addenda, deadlines, submission requirements, qualifications, and bidding conditions—directly from Antioch City prior to bidding.