Verification Example for Time-Dependent ECF Formula 



The conditions shown in figure 6.2 have been met satisfactorily at all three evaporation 

 ponds studied. The example above shows that if the inflow ClTVace Element Ratio is not the 

 same as the pond water ratio (case B), the increase cannot be expressed in an ECF which would 

 preclude the use of ECFs as a prediction tool. In contrast, the increase due to inflow addition (case 

 A) can be described by an ECF (case C) meaning that deviations in observed values from the ECF- 

 predicted values can be interpreted as reactivity of the trace element. 



Figure 6JJ. Conditions necessary for Time-I>ependent ECF calculations. 



Example Calculation Using TD-ECF 



An example calculation usingtheTD-ECFisdonehereusingthefollowingparameters: 



Initial Conditions 



Date 11/15/86 



[CI] 17,500 mg/1 



[B] 43.18 mg/1 



Final Conditions 



8/9/88 



139,133 mg/1 

 237.2 mg/1 



TDECF = 



[ai 



[Ql 



'final ^ 139,133 ^ ^ 



initial 



17,500 



95 



ptige 6.2 



