Rising main works pit pump station - Contractor and Subcontractor's workers are observed working in this location, permits are issued by both parties with numerous activities that is not clear, permits are not reviewed and signed by the HSE personnel.  Contractor was performing continuous atmospheric testing during the time their personnel were present in the deep excavation and subcontractor failed to follow procedures.  Various levels of H2S and CO gases were recorded by the Contractor and Engineer's instruments.
Hazard category: Unsafe excavations