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5 BASIS OF PLANNING <br /> <br />FIGURE 5.1 <br />Dry Weather Maximum Week Effluent Concentration Requirements <br />Based on Existing Mass Load Limitations and Projected Flows <br />MWMC Facilities Plan, Eugene-Springfield <br /> <br /> 16.0 t ..... r 125 <br /> <br /> Current E~uent <br /> 15,0 Concentration L{m~t <br /> <br /> 14,0 <br /> <br /> 9.0 <br /> <br /> 7.0 - <br />  3~ s -'~ <br /> <br /> 6.0 ~- 25 <br /> 2005 20~0 20~5 2020 2025 2030 2035 2040 2045 2050 <br /> <br /> Yea <br /> <br /> ~CBOD and TSS Concentrat;on ~ Max Week D~Wea~er Flow + Average D~ Weather Flow <br /> <br />Wet season maximum week mass limitations for both CBOD and %SS as outlined in the <br />NPDES permit are based on the average wet season flow of 75 mgd. Concentration limits <br />are also specified in the NFDES permit. Figure 5A.3-4 illustrates the anticipated maximum <br />week CBOD and TSS concentrations that result from proiected flows and m-tchanged mass <br />limitations as specified in the existing NPDES permit. These are shown relative to the <br />anticipated concentration limits. Daily maximum mass limits also apply but are suspended <br />when the average flow exceeds twice the dry weather capacity rating of the facility <br />(currently 98 mgd). <br /> <br />MWMC_5,0_REV8 DOC 5-7 <br /> <br /> <br />