The contact tank is post UV ...

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The contact tank is post UV disinfection and should be there to allow for the chlorine to reach its potential prior to going directly into a distribution system. If the water is going to be pumped to ground or elevated storage, then it wouldn't necessary. Where is the chlorine residual being measured? After the contact chamber?

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Thanks very much for your answer, very appreciated. 

The water is pumped to a reservoir or storage, and the chlorine residual is currently being measured after the contact tank, yes.

Sorry to ask, but could you please clarify why if it's pumped the Ct is not necessary? 

Thank you very much again.

Gloria

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