please organize list depend on Hierarchy of hazard controls

Existing Control Measures 1. Constant hydration 2. Use fresh air flow for a minimum period of 24 hours prior to entry 3. Constant communication with outdoor personnel 4. Gas monitoring prior to entry 5. Presence of safety officer and competent emergency rescue person 6. Check wastewater flow and pressure, and accordingly use a stopper, or a stopper and reduce wastewater flow at pumping station 7. If a pneumatic stopper is to be used, ensure it has a valid certificate of calibration 8. Implement toxicity reduction measures 9. Gas monitoring prior to entry 10. Employees to maintain fitness in order to climb stairs 11. Oxygen monitor to be used 12. Use of appropriate forced ventilation mechanis 13. Use of p below TLV 14. Avoid entering manholes during rainy conditions or during sandstorms 15. Employees to maintain fitness in order to climb stairs 16. Implement vaccination scheme for employees in regular contact/exposure with/to wastewater 17. Safety induction training| 18. Confined spaces training to be provided 19. Prepare appropriate emergency and evacuation plan 20. Implementation of lock out / tag out procedures 21. Post-entry personal hygiene to be enforced (eg. use of 22. PPE to be worn at all times and appropriate harness to be used Existing Control Measures 1. PPE to be worn at all times (if required harness also to be used) 2. Employees to maintain fitness in order to climb stairs 3. Constant hydration 4. Safety induction training 5. Confined spaces training to be provided 6. Oxygen monitor to be used 7. Constant communication with outdoor personnel 8. Gas monitoring and if toxic gas presence is expected 9. Presence of safety officer and competent emergency rescue person 10. Use of appropriate forced ventilation mechanism 11. Post-entry personal hygiene to be enforced (e.g. use of antiseptic soap) 12. Implementation of lock out / tag out procedures 13. Ensure appropriate lighting 14. Implement toxicity reduction measures 15. Lone workers, inexperienced workers and medically-unfit personnel are prohibited from working in confined spaces 16. Prepare appropriate emergency and evacuation plan 17. Adopt a Confined Space Permit Program (in line with OSHADSF)