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BASIS OF PLANNING <br /> <br />RGL~RE ,5,1 <br />Dry Weather Maximum Month Effluent Concentration Requirements <br />Based on Existing Mass Load Limitations and Projected Flows <br />MWMC Facilities Plan, Eugene-Springfield <br /> <br /> 12.0 -- - <br /> - -- 85.0 <br /> <br /> 75,8 <br /> 10.0 ju./~ ~-~..~.~._ _ _ Current ECfluent Concentrabon <br /> '9.9 ~-'.~.. <br /> <br /> 6.0 J ......... . .................... Z __ 55.0 <br /> 4.0 --4,.0 ......................... 45.0 <br /> <br /> 0.0 ~3 25.0 <br /> 2005 20~0 20~5 2020 2025 2030 2035 2040 2045 2050 <br /> ~r <br /> <br /> ~ CBOD a~d ~S Concentration + DW Weather Max Month Flow ~ Average D~ Weather Flow <br /> <br />Similarly, wet season maximum month mass limitations for both CBOD and TSS as outlined <br />in the NPDES permit are based on the average wet season flow of 75 mgd. Although <br />significantly higher, concentration limits are also specified in the NPDES permit for wet <br />weather. Percent removal requirements also apply. Figure 5.1.3-2 illustrates the anticipated <br />maximum month CBOD and TSS concentrations that restdt from projected flows and <br />unchanged mass limitations as specified in the existing NPDES permit. These are shown <br />relative to the anticipated concentration and percent removal requirement. However, <br />because peak wet weather flows are very dilute, it is the percent removal requirement that <br />limits effluent CBOD and TSS during critical wet weather flow periods and this is the most <br />difficult to achieve. <br /> <br />MWMC_5 o_REV8 DOC 5-5 <br /> <br /> <br />