Occupational Hygiene Monitoring Survey Report
Hazardous Chemical Agents And Ventilation Survey Report
Vaal Chemical Works · Sasolburg Complex
08 Sept 2026
Project Number OH-2026-131 · Revision 0
Survey Information Details
| Report Number | OH-2026-131-R0 |
| Project Number | OH-2026-131 |
| Client | Vaal Chemical Works |
| Site / Premises | Sasolburg Complex |
| Physical Address | Industrial Rd 4, Sasolburg |
| Survey Date | 08 Sept 2026 |
| Stress Factor | Hazardous Chemical Agents · Ventilation |
| Surveyor | Thandi Mokoena |
| Technical Signatory | Riaan de Villiers |
| Applicable Legislation | Hazardous Chemical Agents Regulations, 2021 · SANS 10400-O |
| Occupational Exposure Limit | OEL-TWA And OEL-STEL Per Table 1 Of The HCA Regulations, 2021 |
1.0 Executive Summary
Vaal Chemical Works contracted The Safety Network (Africa) (Pty) Ltd to conduct a hca & ventilation survey at Sasolburg Complex, Industrial Rd 4, Sasolburg. The survey was conducted on 08 Sept 2026 by Thandi Mokoena.
Respirable dust exposure at the mixer exceeded the OEL-TWA and the mixing booth hood face velocity was below the design minimum.
2.0 Purpose Of The Survey
- Determine employee exposure to hazardous chemical agents during normal work
- Assess the performance of local exhaust and general ventilation systems
- Compare exposures with the prescribed OEL-TWA and OEL-STEL
- Recommend engineering and administrative control measures
3.0 Contents Of Report
- 1.0Executive Summary
- 2.0Table Of Contents
- 3.0List Of Tables, Figures And Diagrams
- 4.0List Of Terms And Abbreviations
- 5.0Introduction
- 6.0Monitoring Methods And Procedure Followed
- 7.0Results And Discussion
- 8.0Recommendations
- 9.0Conclusion
- 10.0Indemnity And Signatures
- 11.0References
- 12.0Annexures To The Report
4.0 Instruments Used
| Instrument | Serial Number | Calibration Due |
|---|---|---|
| Gilian 5000 pump | GIL-4402 | 04 Nov 2026 |
| Gilian 5000 pump | GIL-4407 | 22 Oct 2026 |
| SKC Airchek TOUCH | SKC-2210 | 27 Sept 2026 |
5.0 Results And Discussion
| Sample No. | Employee / Position | Agent | Method | Result mg/m³ | OEL-TWA | OEL Exceeded |
|---|---|---|---|---|---|---|
| HCA-01 | Spray Painter | Xylene | NIOSH 1501 | 28.4 | 221 | No |
| HCA-02 | Mixer Operator | Respirable Dust | NIOSH 0600 | 3.9 | 3.0 | Yes |
| HCA-03 | Welder | Welding Fume | NIOSH 7300 | 4.1 | 5.0 | No |
| LEV-01 | Mixing Booth Hood | Face Velocity | Anemometry | 0.38 m/s | 0.50 m/s | Yes |
Respirable dust exposure at the mixer exceeded the OEL-TWA and the mixing booth hood face velocity was below the design minimum.
6.0 Recommendations
- Service and re-balance the mixing booth extraction system
- Maintain respiratory protection until engineering controls are verified
- Repeat personal sampling after ventilation repairs
- Include exposed employees in medical surveillance
7.0 Conclusion
Chemical exposure control depends on restoring the extraction system to its design performance.
8.0 Annexures To The Report
- Annexure A — Certificate Of Approval As A Department Of Employment And Labour Approved Inspection Authority
- Annexure B — SAIOH Certificates Of Surveyor And Technical Signatory
- Annexure C — Equipment Calibration Certificates
- Annexure D — Raw Measurement Data
- Annexure E — Photo Log
- Annexure F — Site And Floor Plans
- Annexure G — Laboratory Analysis Certificates
- Annexure H — Ventilation Measurement Sheets
The Safety Network (Africa) (Pty) Ltd
T/A SafeNet Africa
Dept. of Employment and Labour: AIA OH 0242 CI062
Signature of Technical Signatory
Riaan de Villiers
Signature of Surveyor
Thandi Mokoena