Cleaning of Clarifiers. (1.1.1) Ea 4
Cleaning of Clarifiers. The Contractor verifies that the relevant clarifier is drained, isolated and is made safe to work on by means of the issue and acceptance of a Permit to Work (PTW) by the Responsible Person (RP). Furthermore, the Contractor’s Authorised Supervisor (AS), as per and that all workers are signed on to the RP’s Worker’s Register. The Contractor establishes scaffolding requirements and requests the Employer to erect scaffolding and barricading wherever necessary. Planning is required twenty four hours in advance for new scaffolding/barricading and for any modifications as well. Scaffolding and barricading cannot be erected, moved, dis-assembled or modified by the Contractor. Safety harnesses must be worn by all the Contractor’s personnel to access scaffolds via ladders and in all areas when working at heights. The Contractor removes approximately 20m3 of sludge and debris from each clarifier The Contractor removes approximately 20m3 of sludge from each clarifier by means of hosing with water and sweeping the sludge through the clarifier drain valves that discharges into the water treatment plant effluent system. The Contractor high pressure cleans the internal concrete walls of each clarifier. The Contractor cleans the two vacuum blower rooms. The Contractor disposes of all waste generated during the cleaning process according to the Employer’s waste management procedure.
