expected, an increasing trend in outflow concentration for greater background


concentrations and the greater the reaction rate the less variability in outflow occurred.


For a k of 0.01 days-', which is similar to the calibrated value, the outflow concentration


varied from about 0.055 mg/L at C* equal to 0.005 mg/L to 0.065 mg/L at C* equal to


0.030 mg/L. From this analysis, it was clear that the calibration of k and C* can


significantly affect the results of the modeling.


 0.120



 0.100

 _1

 E 0.080

 S- k = 0.001
 k = 0.005
 S0.060 -k = 0.010
 Sk = 0.050
 S--k = 0.100
 0
 r 0.040



 0.020



 0.000
 0.000 0.010 0.020 0.030 0.040
 Background Concentration, C* (mg/L)

Figure 4-17. Sensitivity Analysis for EAASR Parameters k and C*

 The effect of the overall reaction rate on both the EAASR and STA 3/4 was


evaluated. The outflow concentrations for large ranges of EAASR k values were


calculated for the EAASR and STA 3/4. This analysis used a fixed EAASR C* of 0.025


mg/L and the reported STA 3/4 parameters. A large effect on the outflow concentration


of the EAASR was observed for reaction rates less than 0.05 days-'. The STA 3/4