Tender Summary

Objectives

The primary objective is to locate, access, and repair a suspected leaking underground water pipe situated beneath a strong concrete driveway slab and potentially extending under an adjacent tarred parking area. Following successful repairs, all disturbed surfaces must be fully reinstated to match the original condition while ensuring environmental protection and strict adherence to occupational health and safety regulations.

Scope of Work

• Conduct a compulsory site meeting to verify quantities, access routes, and ground conditions.
• Clear the site, saw-cut, break, and remove the existing 250mm concrete slab and necessary tarred pavement to expose the pipeline.
• Excavate topsoil and prepare the subgrade, compacting soil to specified density standards.
• Trace the affected pipe, cut out damaged sections, and install replacement pipework, fittings, and couplings.
• Perform pressure and leak testing to confirm a watertight repair prior to final reinstatement.
• Reconstruct the surface by laying approved sub-base material, installing reinforcement mesh, casting new concrete, curing, and replacing paving blocks to match existing patterns.
• Remove and legally dispose of all excavation spoil, concrete rubble, and construction waste at approved facilities.
• Implement a site-specific safety plan and ensure zero environmental contamination or sewer spillages during construction.

Technical Requirements

• Earthworks: Trenches must be a minimum of 1200mm deep with 800mm pipe cover. Width must equal the pipe diameter plus 500mm on each side. Soil compaction must achieve 90% of the modified AASHTO standard.
• Concrete Works: Minimum compressive strength of 25 MPa for reinforced concrete and 30 MPa for mass concrete. All concrete works must meet Degree II accuracy standards and comply with municipal PSGA specifications. A142 wire mesh reinforcement must be installed per engineer instructions.
• Pipework: Must conform to SABS ISO 4427 standards using PE100 material, with diameters ranging from 20mm to 200mm and specific Standard Dimension Ratios (SDR).
• Compliance & Testing: All activities must align with PSDB earthworks and construction standards. Final quality control inspections will be conducted upon completion, and all dimensions/quantities must be verified on-site before quotation submission.

Skills and Qualification Requirements

• Contractor must hold a minimum CIDB grading of 1CE.
• Submission of a Curriculum Vitae for a suitably qualified Civil Engineering Technician with proven experience in concrete construction and related civil works.
• Provision of a valid certificate for a qualified plumber to oversee pipework installation and pressure testing.
• Supplier must be registered on the Central Suppliers Database (CSD) and the Municipal Council Database, accompanied by a current Tax Compliance Certificate and Letter of Good Standing from the Compensation Fund.
• Completion of all mandatory municipal bid documentation, including declarations on past supply chain practices, independent bidding determination, conflict of interest, and preferential procurement points claiming forms.
• Implementation of a comprehensive Site Health, Safety, and Environment (SHE) file, including risk assessments and induction protocols, subject to client safety officer audits.

Explanation of Specialized Terms

• CIDB Grading: A South African industry classification system that rates contractors based on financial capacity, equipment availability, and project experience.
• Modified AASHTO: A standardized laboratory method for determining optimal soil compaction density used in civil engineering and road construction.
• PSGA/PSDB/PSGL: Municipal engineering specification manuals governing concrete construction, earthworks, and medium-pressure pipeline installations respectively.
• Degree II Accuracy: A concrete workmanship tolerance class requiring precise dimensional control, formwork alignment, and finish quality.
• CSD: The national government database used to verify supplier legitimacy, tax compliance, and registration status for public sector procurement.