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MW'MC FACILITIES PLAN <br /> <br />4.2.1 Historical Seasonal Loading Analysis <br />Historical loading data from May 1990 through May 2002 were evaluated, with <br />corresponding flow data, to determine average, maximum month, maximum week, and <br />maximum day BOD and TSS loads. The data analysis was broken up into dry and wet <br />weather seasons. The two seasons aligner with the effluent requirements as specified in the <br />WPCF's NPDES permit. Dry weather includes flows occurring between May 1 and <br />October 31. Historical dry weather average and maximum month loads are depicted in <br />Figure 4.2.1-1. Wet weather includes flows occurring between November i and April 30. <br />Historical wet weather average and maximum month loads are depicted in Figure 4.2.1-2. <br /> <br />FIGURE 4,2,1-1 <br />Dry Weather Maximum Month Loads <br />MWMC Facilities Plan, Eugene-Springfield <br /> <br /> lo, ooo <br /> <br /> 0 L <br /> 1990 lg91 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 <br /> <br /> ~ Dry W~at~er Ma~murt3 Mont~l BOO Lo~dm~J -~--Ory We~ttte~t Maximum Month T$.~ Loading <br /> <br /> 4-8 MWMC_40_REV900C <br /> <br /> <br />