Routing all STA 3/4 inflows, the SC STA scenario, through the EAASR provides

large gains in water quality when compared to the base scenario. Long-term STA 3/4

inflow concentrations were identical for the SC STA scenario and the SC base scenario at

12 feet of depth. Therefore, it may be possible to achieve similar gains to increasing the

depth of the EAASR by routing all STA inflow through the EAASR first. The

combination of increasing depth and routing STA flows achieves some additional gains

in water quality. At the low concentrations of the STA, it is difficult to achieve large

gains in water quality. Large gains are more easily made by altering the EAASR

operations.

 STA 3/4 alone could achieve nearly the same water quality as the EAASR/STA

two reactor system because of the 29 day HRT. Recall from Figure 4-22, the outflow TP

concentration at an HRT of 29 for STA 3/4 is approaching the background level. This

suggests that the HRT may be under used and more inflow could be accommodated to

reduce its HRTs to about 10-15 days, without a significant decrease in load reduction.

Two Compartment Reservoir

 The two compartment reservoir differs from the single compartment case mainly

due to the interaction between the two compartments and the elimination of direct flow

from the Miami Canal. The base scenario was modeled as presented (Figure 4-5). In the

TC STA Inflow scenario, the direct NNR canal flows to STA 3/4 were routed through the

reservoir before being released to the STA (Figure 4-6). The results of the analyses are

shown in Tables 5-3 through 5-5. The TC base scenario EAASR achieved good removal,

though lower than the SC base scenario. However, the STA achieved identical outflow

concentrations in the SC and TC base scenarios. The increased loading in the TC STA

scenario decreased the EAASR performance, as expected. However, the STA inflow