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4.4 ENVIRONMENTAL EFFECTS OF THE OPTIONS 
This section describes the environmental effects of the options. As 
discussed in Chapter 2, the results for the 2000 POTWs are currently based on 
modeling the impacts of the options on 1839 POTWs. The remaining 161 POTWs were 
not included because all of the available information showed that they either 
had no industrial contribution or that they discharged into other POTWs. Thus, 
the results for the 1839 POTWs should reasonably represent the total impacts. 
This section focuses on the impact of the options on the pass-through 
of pollutants and the resulting effects on water quality as measured by 
exceedances. 
4.4.1 Bypasses, Interference and Upsets 
The impact of the options on reducing the number or severity of bypasses 
and upsets has not been quantified in the model. Chapter 3 provided a detailed 
discussion of the prevalence of these problems and their significance. All of 
the options, except for guidance, ensures that these problems are dealt with 
because they all include the basic 403 program. 
4.4.2 Removal of Pollutants 
The “environmental effects that have been quantified include: pounds of 
toxic organics and toxic metals removed, percent reduction of toxic pollutants 
in POTW effluent, and the percent reduction of toxic contaminants in effluent 
- sludge. These estimates are shown in Table 4-2. Available in Chapter 3 are 
additional data on incremental consumption of water quality criteria and a 
comparison of BAT removals with POTW efficiencies. 
es JB Associates 
