Access road maintenance and restoration — SENTECH welverdiend site (rfx6000003787)

Service delivery address

Welverdiend Sentech Site T96

Carletonville

Johannesburg, 2499

GPS: 26 26 47 s; 27 14 55 e

Submission

• Quotations must reach Sentech SCM by the closing deadline; a quotation that does not arrive by the deadline is automatically disqualified.
• No submission email address, physical delivery address or number of copies is stated.

Documents to accompany the quotation

• Completed Sentech Welverdiend T96 road repairs pricing schedule (bill of quantities with rates, contingency at 10% and VAT at 15%).
• Detailed execution programme in Bar Chart format showing the site name, activity description, activity duration and key milestone dates.

Post-appointment documents

• Health and safety file compliant with Sentech requirements, submitted to the Sentech OHS Specialist within 3 days of appointment.

Scope

• Maintenance and restoration of the tarred access road at Sentech's Welverdiend site T96, Carletonville, Johannesburg (GPS 26 26 47 S; 27 14 55 E).
• Road length 2.2 km, width 3.5 m; slurry seal 3 mm to 6 mm thick when dry.

Work content

• Site establishment, detailed road condition assessment, temporary facilities, utilities and services, site clearance and safety measures.
• Sawing of asphalt where grass has grown through the road, to a depth not exceeding 50 mm.
• Removal of grass including all roots, followed by application of poison to prevent regrowth before repairs and the final slurry seal coat.
• Patching of identified potholes in accordance with TRH 3 (2007) Section 6.
• Repair of edge breaks along the full 2.2 km.
• Supply and application of slurry seal in accordance with TRH 3 (2007) Section 7.

Materials

• Aggregate: crusher dust, 2 mm to 4.7 mm grading.
• Filler: Portland cement or an approved equivalent.
• Water: approximately 160 litres per cubic metre of dry aggregate.
• Emulsion: base bitumen quick-setting cationic or modified cationic emulsion.
• All materials must be SABS approved.

Mixing and application

• Batch mixing in a tilt or non-tilt concrete mixer; small quantities may be mixed in a wheelbarrow; mechanical equipment and spreader boxes are used for layers thicker than 3 mm.
• Mixing sequence: aggregate first, then filler, then water, then emulsion, with water added as needed to reach the required consistency.
• The slurry must be workable by hand squeegee or mechanical spreader and must cure without raveling, bleeding or deformation.

Standards

• Work to Sentech's preventative maintenance policy, SABS 548:1972 and 309:1972, and the SABITA manual.
• Surface preparation to follow TRH 3 (2007) Section 6 and the labour-intensive surfacing equipment listed in that guideline.
• Workmanship must meet Sentech standards; defective work must be rectified by the contractor.
• No slurry may be applied before a sample or demonstration is completed in the presence of a Sentech representative.

Site conditions

• The contractor provides its own food, water, power and portable toilet from the first day of site establishment.
• Tents may be used for accommodation on site, subject to verification with the OC Manager and the Security Division.
• All rubble and waste must be removed from site; no chemical spillage on Sentech landscaping or infrastructure; no fires on site.
• Working hours to be confirmed by the Operations Manager, Johannesburg.

• Surface preparation follows the guidelines of the South African Road Agencies TRH 3 (Pretoria, Version 1.5, May 2007) Section 6.
• Labour-intensive surfacing equipment listed in TRH 3 Figures 11-1 to 11-10 and Section 11.4.1 is recommended.

• Quality assurance inspections are carried out at the key dates and milestones set at the site handover meeting.
• The Infrastructure Services Manager or a Sentech trade-tested construction artisan inspects the works at any stage or time during the contract.
• A detailed execution programme in Bar Chart format must be submitted with the quotation, showing the site name, activity description, activity duration and key milestone dates.
• Milestone 1: completion of surface preparation.
• Milestone 2: start of the slurry seal task, with a compulsory sample or demonstration and quality inspection.
• Milestone 3: quality inspection immediately after the final coat over the resurfaced potholes.
• Workmanship that does not meet Sentech standards must be rectified by the contractor.
• The contractor must keep Sentech informed of inspection intervals.
• No slurry may be applied before a sample or demonstration is completed in the presence of a Sentech representative, following the recommended batching procedure.
• The contractor must comply with Sentech House Rules for external contractors.

Pricing format

• Priced bill of quantities (Sentech Welverdiend T96 road repairs pricing schedule); a rate and amount must be entered against every item.
• Items: removal of growing grass and poisoning; sawing and patching with premix asphalt; pothole repairs; edge break repairs; slurry seal application; site establishment; preliminary and general; contingency at 10%.
• Subtotal, VAT at 15% and grand total must be shown.
• Summary sheet requires the road repairs and slurry seal total, preliminary and general, total excluding VAT, VAT at 15%, and total including VAT.

Eligibility and conduct

• Subcontracting of any part of the work is not permitted.
• All materials must be SABS approved.

Health and safety

• Health and safety file compliant with Sentech requirements, submitted to the Sentech OHS Specialist within 3 days of appointment.
• Valid medical fitness certificate issued by an Occupational Medical Practitioner for every employee assigned to the project.
• Detailed safe working methodology for the assigned tasks.
• Valid construction/project public liability insurance.
• Health and safety compliance undertaking signed by the CEO or Managing Director.
• COID or FEM registration for injury-on-duty cases.
• The contractor must familiarise itself with Sentech House Rules for external contractors.

• Health and safety file compliant with Sentech requirements, submitted to the Sentech OHS Specialist within 3 days of appointment.
• Valid medical fitness certificate issued by an Occupational Medical Practitioner for every employee assigned to the project.
• Detailed safe working methodology for the assigned tasks.
• Valid construction/project public liability insurance.
• Health and safety compliance undertaking signed by the CEO or Managing Director.
• COID or FEM registration for injury-on-duty cases.
• Site establishment must address health and safety, efficiency and compliance, including road assessment, temporary facilities, utilities and services, site clearance and safety measures.

• Contract duration: not more than 30 working days.
• One-year warranty on materials and workmanship.
• No subcontracting of the work.
• The site handover meeting marks official handover of the site to the contractor for the contract duration; progress meeting intervals are set at that meeting.
• The Infrastructure Services Manager conducts additional intermediate site inspections.
• Problems during the contract must be reported immediately to the Infrastructure Services Manager, or to the Operations Manager if the Infrastructure Services Manager is unavailable.
• Working hours to be confirmed by the Operations Manager, Johannesburg.
• Sentech vehicles and personnel must be accommodated for emergency work.
• Surface preparation follows TRH 3 (2007) Section 6.
• Safety requirements: health and safety file within 3 days of appointment, medical fitness certificates for all assigned employees, detailed safe working methodology, valid public liability insurance, health and safety compliance undertaking by the CEO or Managing Director, and COID/FEM registration.
• The contractor must familiarise itself with Sentech House Rules for external contractors.

• Accommodation on site in tents is permitted, subject to verification with the OC Manager and the Security Division.
• The contractor provides its own food, water, power and portable toilet from the first day of site establishment.
• Subcontracting is not permitted.
• All materials must be SABS approved.
• All rubble and waste must be removed from site.
• No chemical spillage on Sentech landscaping or infrastructure.
• Sentech accepts no liability for bad weather.
• Contract duration is not more than 30 working days.
• Initial and final handover must be attended by the site supervisor, manager or business owner.
• One-year warranty on materials and workmanship.
• No fires on site.
• Specifications, quality standards, procedures and guidelines must be adhered to at all times.
• Working hours to be confirmed by the Operations Manager, Johannesburg.
• Sentech vehicles and personnel must be allowed access for emergency work, as discussed at the site meeting.
• Quotations must reach Sentech SCM by the deadline; failure results in automatic disqualification.

Quality inspections

• Quality assurance inspections take place at the key dates and milestones agreed at the site handover meeting.
• The Infrastructure Services Manager or a Sentech trade-tested construction artisan may inspect the works at any stage of the contract.
• A quality inspection is required when the slurry seal task commences; a sample or demonstration is compulsory.
• A quality inspection is required immediately after the final coat is applied over the resurfaced potholes.