For a second straight day the workers protested to highlighted concerns affecting them.
They claim there are health, safety and over time issues.
However, Port of Spain Deputy Mayor, Kerron Valentine, in a News Power Now interview said the employees are working to rule.
Mr Valentine said the workers also protested between noon and 1 pm in front of City Hall today.
He said the Corporation is concerned about the present situation and confirmed that a contractor has been hired to provide sanitation services in the interim.
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Mr Valentine added that efforts are being made to meet with the union which represents the employees to resolve the differences.