How did toxic gas levels exceed safe thresholds at the waterworks?

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Toxic Gas Levels Exceeded Safe Thresholds Due to Workplace Safety Lapses During Tank Cleaning Operations

Sensors at the Choa Chu Kang Waterworks recorded hydrogen sulphide levels surpassing safe thresholds, triggering an alarm during a tank cleaning operation. These elevated levels are linked to alleged workplace safety lapses by the contractor, Stargroup, which led to the deaths of two workers exposed to the toxic gas.
Exposure Occurred During Confined Space Entry

The incident occurred on May 23, 2024, when four workers were engaged in cleaning a water treatment process tank. Three workers subsequently collapsed after entering an enclosed passage beneath the tank to close hand valves, indicating the exposure happened within this confined area.
Hydrogen Sulphide Identified as the Toxic Agent

Investigations by the Ministry of Manpower (MOM) confirmed that the workers were exposed to hydrogen sulphide gas, a substance known to be fatal even at low concentrations. The MOM stated that sensors at the site had registered levels of this gas exceeding established safety limits at the time of the incident.
Contractor Charged for Failure to Implement Safety Measures

Stargroup, the contractor hired by PUB for the tank cleaning, has been charged with failing to implement reasonably practicable measures to minimise workplace risks. Specifically, the authorised manager for confined space entry permits at Stargroup also faces charges for allegedly not exercising due diligence when issuing these permits, suggesting procedural failures contributed to the hazardous conditions.

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How did toxic gas levels exceed safe thresholds at the waterworks?

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