1. Water Services Trust Fund
The Urban Projects Concept (UPC) Implementation Workshop
Quality of Works

2. Why Emphasise Quality?
To promote use of water in a hygienic environment
For sustainability and durability
For returns on investment
Image of the WSP among the public

3. Lessons from the WSTF Pilot Projects
Quality of construction works was largely affected by:
Weak supervision
Lack of adherence to technical specifications
Sloppy and incompetent Contractors
Theft of materials
Varying site conditions

4. Quality of works: Examples of “Don'ts”
Poor finishing
Evidence of poor concrete mix
Neglect of the water kiosk
Evidence that drawings
were not followed
No angle bars

5. Examples of “Don'ts” (cont’d)
Incomplete work
Poorly done soak pit
Gulley trap is uncovered
Accumulation of solid waste
Unkempt surroundings
Uncovered; posing a hazard

6. Examples of “Don'ts” (cont’d)
Poor concreting (ELDOWASS)
Short kicker bars (NZOWASCO)

7. Examples of “Don'ts” (cont’d)
Unacceptable poor quality of columns (NZOWASCO)
Unacceptable result of using poor materials (NZOWASCO)

8. Examples of “Don'ts” (cont’d)
Leakage
Wrong material usage
Poor quality improvising

9. Examples of “Don'ts (cont’d)
Poor plumbing
Prone to rain water
Lack of repair works

10. Examples of “Don'ts” (cont’d)
Poor drainage around kiosk
Effect of leaking tank on roof slab

11. How Do We Ensure Quality?
Following construction guidelines and the Toolkit
Drawings and specifications
Routine inspections
Testing and approval of materials
Ensuring safe and healthy environment

12. Technical Specifications
Materials
Rejection of substandard materials
Examination of all materials arriving on site- should fit the specifications
Handling and storing materials with care
Codes of practice
Reference to be made to relevant codes of practice: (BS 8110, BS 5950, BS 6399, BS 4466 etc.)

13. Technical Specifications (cont’d)
Drawings
All technical drawings to be accurately adhered to
A set of the drawings must be provided on site at all times
Setting Out
Works shall be set out accurately
WSP to establish and locate all benchmarks, lines, boundaries and/ or levels on the ground
The Site
Accessible; with secure storage for materials and plant
The works should not adversely interfere with the environment

14. Technical Specifications (cont’d)
Concrete
Mix concrete in specified ratios at the site
Approved mechanical means of handling concrete are encouraged
Concrete should be placed in single operation to the full thickness of slabs and beams and similar members
Concrete in columns should be carefully placed and well vibrated
Work cube tests recommended

15. Technical Specifications (cont’d)
Curing of Concrete
Protect concrete from premature drying by protection from wind, sun or rain by sheeting, or other approved means
Wet the concrete continuously for 14 days
Reinforcement
Fabrication, bending and fixing of reinforcement should be in accordance with standards
Shall be free from rust, grease or any substance likely to reduce the bond between steel and concrete

16. Technical Specifications…cont’d
Finishes
Painting and other finishes to be carried out on clean surfaces
According to specifications
Fittings
High quality plumbing parts required; especially gate valves, bends and taps
Right class of pipes should be used

17. Supervision of Labour Competence Workers on site should be experienced
Removal of incompetent labour
encouraged
Approval
Work done shall be subject
to approval by Engineer
Engineer to ensure that works
are complete before payment

18. Supervision of Labour (cont’d)
Drawings
Workers should be able to
interpret all drawings
Safety & Health
Safety and health needs of
workers should be addressed

19. Thank you!