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4. WASTEWATER CHARACTERISTICS FIGURE 4.2.1-2 Wet Weather Maximum Month Loads MWMC Facifities Plan, Eugene-Springfield 80,000 - 70,000 . 60,000 ~ ~.//' - '"- - 50,000 40,000 ~-'~---~_ 20,000 · lO,O00 i O' 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 Year --*--Wet Weather Maximum Month 60D Loadinej .-~--Wet Weather Maximum Month TSS Loading ~ 4,2.2 Historical Loading Statistics Per capita loads are commonly used to estimate future loading conditions and are frequently based on analyses of historical seasonal average data. To calculate the average seasonal per capita domestic wastewater loads, it is necessary to correlate historical population h~formation with the historical seasonal average domestic wastewater loading data. These per capita values are then used in conjunction with projected populations to estimate future domestic seasonal wastewater loads to the WPCF. In addition, peaking factors for maximum month, maximum week, and maximum day were developed from the seasonal historical data. Tables 4.2.2-1 and 4.2.2-2 present the historical dry and wet weather BOD per capita and peaking factor statistics, respectively. TABLE 4.2.2-1 Historical Dry Weather BOD Loading Statistics MWMC Facilities Plan, Eugene-Springfield BOD Loading Per Maximum Month Maximum Week Maximum Day Year Capita (ppcd) Peaking Factor Peaking Factor Peaking Factor Minimum 0.12 1.1 1.2 1.4 Average 0.15 1.2 1.4 1.7 Maximum 0.19 1.3 1.7 2.4 MWMC 4.0 REVg.00C 4-9