Construction tender: comprehensive upgrade and refurbishment of winburg water treatment works (civil, mechanical & electrical)

• Issue Date of Tender Documents: Friday, 22 May 2026.
• Compulsory Briefing/Site Visit: Thursday, 4 June 2026 at 11:00 at Winburg Water Treatment Plant, Winburg, 9420. Coordinates: 28°33'6.59"S, 26°59'28.85"E. Attendance is mandatory; failure to sign the attendance register and Site Inspection Certificate will result in disqualification.
• Clarification Deadline: Requests for clarification must be submitted to the Employer's Agent at least 7 working days before the closing date.
• Closing Date for Tender Submission: Friday, 19 June 2026 at 12:00.
• Tender Validity Period: 120 business days from closing date (may be extended by 60 days without consent).

• Technical Queries: Mr. K. Pule, Vaal Central Water. Tel: +27(0) 51 403 533. Email: [email protected].
• Tender Administrative Queries: Supply Chain Management, Vaal Central Water. Tel: 051 403 0800. Fax: 051 422 5333. Email: [email protected].
• Employer's Agent (Engineer): Umzuzo Infrastructure (Pty) Ltd T/A UMZ Consulting. Contact: Mr. MK Ntshangase. Tel: +27 33 342 2929. Email: [email protected]. Address: Regus Business Centre, Ground Floor, Unipark Building, Vodacom Lane, Nobel Street, Bloemfontein, 9301.
• Physical Submission Address: Tender Box, Vaal Central Water, Ground Floor Main Entrance, 2 Mzuzu Street, Pellissier, Bloemfontein, 9300.
• Tender Documents Available: National Treasury eTender Portal (www.etenders.gov.za), Vaal Central Water website (www.vaalcentralwater.co.za), CIDB website (www.cidb.org.za).

• Submit one sealed envelope clearly marked with: Contract No. VCW410/WINWTW/25, project title ('Upgrade and Refurbishment of Winburg Water Treatment Works'), and your company name and address.
• Use the one-envelope system: include both Technical Proposal (Volume 1) and Financial Proposal (Volume 2) in a single envelope.
• Deliver by hand to: Tender Box, Vaal Central Water Reception Area, Ground Floor Main Entrance, 2 Mzuzu Street, Pellissier, Bloemfontein, 9300.
• Deadline: Friday, 19 June 2026 at 12:00 (noon). Late, telegraphic, telephonic, telex, facsimile, or email submissions are not accepted.
• Ensure all returnable documents and schedules (Sections T2.1, T2.2, C1.2, C1.3, C1.4, C2.2, C2.3, C2.4) are fully completed, signed by authorised signatories, and certified where required.
• Do not use correction fluid (e.g., Tippex) on pricing documents; such tenders will be disqualified.
• Tenders must remain valid for 120 business days from the closing date. Vaal Central Water may extend this by 60 days without consent.
• Failure to submit any required returnable document or to acknowledge addenda will render your tender non-responsive.
• No canvassing of officials or attempts to obtain non-public information after tender opening are permitted.

• Pre-Qualification (Immediate disqualification if not met):

• CIDB registration: Contractor grading designation of 7 EP or 7 ME PE/Higher (or joint venture meeting combined grading). Potentially Emerging (PE) enterprises registered one grade lower may qualify with employer support.
• Attendance at the compulsory clarification meeting on 4 June 2026 (sign attendance register and Site Inspection Certificate).
• Fully completed and signed Standard Bidding Documents: SBD 1, 3.1, 4, and 6.1.
• Proof of registration and good standing with the Compensation Commissioner (COIDA).
• Certified copy of company registration documents (Certificate of Incorporation, Founding Statement, Partnership Agreement, or ID for sole proprietor).

• Responsiveness Criteria (Must comply to avoid disqualification):

• Valid Tax Compliance Status PIN from SARS (each joint venture member must submit separately).
• Latest UIF return (if not reflected on tax PIN).
• No abuse of Supply Chain Management system or prior contract failure.
• Not listed on the Register of Tender Defaulters.
• Full Central Supplier Database (CSD) report (registration is compulsory).
• Declaration of Interest form (no conflicts of interest).
• Valid B-BBEE Compliance Certificate or Certified Sworn Affidavit.
• Audited financial statements with a minimum bank rating of 'C'.

• Evaluation Stages:

• Functionality: Minimum threshold must be achieved; failing bids are rejected.
• Price: Scored based on financial tolerance range (market reasonableness assessment).
• B-BBEE: Points scored for contribution.
• Total: Price + B-BBEE points determine ranking.

• Subcontracting Requirement: Minimum 30% of contract value (excluding materials, provisional sums, CPA, contingencies, VAT) must be subcontracted to a minimum 51% black-owned EME or QSE. Submit: signed subcontracting agreement, CSD reports, CIDB registration (if applicable), and B-BBEE proof for subcontractor(s).

Scope: Upgrade and refurbishment of Winburg Water Treatment Works, including civil, mechanical, and electrical works.

Civil Works:

• Preliminary & General items and General Site Works.
• Repair Wolwas Raw Water Pipelines (Provisional).
• Modifications to Wolwas Inlet Chamber.
• Replace the raw water rising main to the WTW.
• Minor improvements to Raw Water Pump Station.
• New Chemical Dosing Building.
• Minor improvements to Inlet Works.
• Repair cracks in Clari-flocculator and unblock Sludge Pipe.
• Major refurbishment of Filter Building and modifications to Filter Inlet Channel.
• Provide New Staff Building and New Chlorination Building.
• Repair or Replace all Leaking Pipes (Provisional).
• New Sludge Holding Pond, Drying Beds, and Wash Water Recovery System.

Mechanical and Electrical Works:

• Refurbishment and upgrading of the Bulk Electrical Supply to the WTW.
• Replacement of Wolwas Dam raw water pump sets, including pipework and new Electrical Control Panel.
• Improvement of Bulk Electrical Supply at Wolwas Pump Station (Provisional).
• Replacement of raw water pump sets at Rietfontein Dam, including pipework, valves, and minor modifications to existing electrical panel.
• Replacement of raw water and clear water Flow Meters, including associated pipework, cabling, control, and instrumentation.
• Replacement of existing Chemical (flocculant) Dosing System, including tanks, pumps, pipework, and electrical controls.
• Refurbishment of the Clari-flocculator rotating bridge, scrapers, and paddle mixers (including supply of one additional paddle mixer).
• Supply and installation of a new sludge (knife-gate) valve, including electric actuator and control system.
• Replacement and upgrading of the Clari-flocculator Electrical Panel.
• Major refurbishment of valves and pipework within the filter building, including modifications to the backwash control system.
• Replacement of Chlorination System, including new equipment housed in a new building, complete with safety systems and controls.
• Replacement of Clear Water Pump-sets, including refurbishment of associated pipework, sump level control, and electrical panel modifications.
• Integration of all pumps and process equipment into the telemetry and basic loss control system for: WTW, Rietfontein Dam pump station, and Winburg Reservoirs.

• Submit a Financial Proposal as part of Volume 2, including:

• Pricing in the Bill of Quantities format (Section C2.2). A digital copy can be requested from [email protected].
• Summary of Schedules (Section C2.3).
• Banking Details (Section C2.4).

• Provide audited financial statements and financial references with a minimum bank rating of 'C'.
• The employer may request a full bank report on your financial standing within 7 days of a request.
• Arithmetical errors in pricing will be corrected as follows:

• Amounts in words govern discrepancies with figures.
• Unit rates govern line-item totals (product of unit rate and quantity).
• Corrected totals govern the total price.
• Tenderer’s tender offer amount governs discrepancies with corrected totals.

• The contractor is responsible for arranging all required insurance for executing the contract.
• No correction fluid (e.g., Tippex) may be used on pricing documents; such tenders will be disqualified.
• Alternative tender offers must include full details: design calculations, bill of quantities, and specifications. Failure to comply may disqualify the alternative offer.

Mandatory Pre-Qualification (Immediate disqualification if not met):

• Fully completed and signed Standard Bidding Documents: SBD 1, 3.1, 4, and 6.1.
• Attendance at the compulsory briefing session on 4 June 2026 (sign attendance register and Site Inspection Certificate).
• CIDB Registration: Must have or be capable of obtaining a contractor grading designation of 7 EP or 7 ME PE/Higher. Potentially Emerging (PE) enterprises registered one grade lower may qualify with employer support. Joint ventures must have all members CIDB registered within 10 days of closing, with a lead partner at the required grading.
• Proof of registration and good standing with the Compensation Commissioner (COIDA) or a licensed compensation insurer.
• Certified copy of company registration documents (Certificate of Incorporation, Founding Statement, Partnership Agreement, or ID for sole proprietor).

Additional Compliance Documents (Must be submitted or available within 7 days if requested):

• Valid Tax Compliance Status PIN from SARS (each joint venture member must submit separately).
• Latest Unemployment Insurance Fund (UIF) return (if not reflected on tax PIN).
• Declaration of no abuse of the Supply Chain Management system or prior contract failure.
• Declaration of not being listed on the Register of Tender Defaulters (Prevention and Combating of Corrupt Activities Act, 2004).
• Full Central Supplier Database (CSD) report (registration is compulsory).
• Declaration of Interest form (no conflicts of interest; includes disclosure of state employees or their relatives).
• Valid B-BBEE Compliance Certificate or Certified Sworn Affidavit.
• Audited financial statements with a minimum bank rating of 'C'.
• Subcontracting Requirement: Minimum 30% of contract value (excluding materials, provisional sums, CPA, contingencies, VAT) must be subcontracted to a minimum 51% black-owned EME or QSE. Required evidence: signed subcontracting agreement, CSD reports, CIDB registration (if applicable), and B-BBEE proof for subcontractor(s).
• Accept that all returnable documents and schedules must be certified by a registered Commissioner of Oaths of the Republic of South Africa.