ACCIDENT CAUSATION AND PREVENTION SCENARIO TWO WORKERS DEPLOYED BY A CONTRACTOR WERE OVERCOME BY HYDROGEN SULPHIDE (H2S) GAS WHICH LEAKED FROM A RELIEF VALVE WHEN THEY WERE TRYING TO REMOVE IT. ONE OF THE WORKERS FELL TO THE GROUND FROM A FIVE-STOREY SCAFFOLD BUT SURVIVED, WHILE THE OTHER WORKER ON THE SCAFFOLD BECAME UNCONSCIOUS DUE TO INHALATION OF THE LEAKED GAS. THE LATTER WORKER SUBSEQUENTLY DIED OF H,S POISONING. TASK CRITICALLY ANALYSE THE POSSIBLE CAUSES AND CONTRIBUTING FACTORS TO THE ACCIDENT IN THE SCENARIO ABOVE. YOUR ANALYSIS SHOULD INCLUDE THE LOSS FROM THE ACCIDENT, SEQUENCE, TYPE OF CONTACT, ROOT CAUSE AND RECOMMEND NECESSARY REMEDIAL ACTIONS TO PREVENT RECURRENCE. ( ) CONTENTS: REGULATIONS 3 INTRODUCTION 3-4 4 4-5 5 Possible causes Loss from the Accident Sequence Type of Contact Root Cause Recommended Remedial Action CONCLUSIONS 5 5-6 6 CO TABLE OF REFERENCES 7