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5. BASIS OF PLANNING <br /> <br />FIGURE 5.1.3-3 <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 /> Current Effluent <br /> 15.0 Concentration Limit ' <br /> 110,~ <br /> <br /> 14.0 ~ 105 <br /> <br /> 9.0 .... 9.0---,~--~.L/~ <br /> 51. <br /> <br /> ...... <br /> <br /> 6.0 25 <br /> 2005 2010 2015 2020 2025 2030 2035 2040 2045 2050 <br /> <br /> Year <br /> <br /> ,, CBOD and TSS Concentration ~ Max Week Dry Weather Flow ~ Average Dry Weather Flow <br /> <br />Wet season maximum week mass limitations for both CBOD and TSS 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 NPDES permit. Figure 5.1.3-4 illustrates the anticipated maximum <br />week CBOD and TSS concentrations that result from projected flows and tmchanged 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_REVSDOC 5-7 <br /> <br /> <br />