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WaterCAD - concentration logic?

I have a particular scenario that has been created for TTHM modeling in an existing system. Care has been exerted to model as close to field data as possible. Field data was used for initial amount at sole water source and modeled to conform to data extracted at field test locations.

In trying to lower initial amount at sole source to estimate what actions would be necessary at source to lower concentrations in the system, I have been unable to lower enough to overcome all system occurances of concentrations above the MCL. In fact,  I have run the scenario with an applied BRR and concentration limit, but with no system concentrations of any kind (0.0 mg/L) and I am still seeing substantial constituent growth throughout the system. (here is my logic question) How is it possible to have growth that even reaches the concentration limit when there are no actual concentrations present in the system?

 Also, I have modeled BRR's as 1st order equations as per majority of literature on the subject - would like to know if anyone has attempted otherwise? - and if so, on what basis of reasoning?

Thank you for any advice,

Eugene

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