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4 WASTEWATER CHARACTERISTICS <br /> <br />FIGURE 4.2,1-2 <br />Wet Weather Maximum Month Loads <br />MWMC Facilities Plan, Eugene-Springfield <br /> <br /> 10,000 -- <br /> <br /> 0 <br /> lgDO lggl lgg2 1993 lgg4 lgg$ lgg6 lgg7 1998 Iggg 2000 200I 2002 <br /> <br /> Year <br /> <br /> --~--Wet Weather Maxl~u~m ~o~[h ~0 LoaEmg ~We~ther ~axlmum Nonth TSS Loadmg <br /> <br />4.2,2 Historical Loading Statistics <br />Per capita loads are commonly used to estimate future loading conditions and are <br />frequently based on analyses of historical seasonal average data. To calculate the average <br />seasonal per capita domestic wastewater loads, it is necessary to correlate historical <br />population h'~formation with the historical seasonal average domestic wastewater loading <br />data. These per capita values are then used in conjunction with projected populations to <br />estimate future domestic seasonal wastewater loads to the WPCF. In addition, peaking <br />factors for maximum month, maximum week, and maximum day were developed from the <br />seasonal historical data. <br /> <br />Tables 4.2.2-1 and 4.2.2-2 present the historical dry and wet weather BOD per capita and <br />peaking factor statistics, respectively. <br /> <br />TABLE 4.2.2-1 <br />Historical DP/Weather BOD Loading Statistics <br />MWMC Facilities Plan, Eugene-Springfield <br /> <br /> BOD Loading Per Maximum Month Maximum Week Maximum Day <br /> Year Capita (ppcd) Peaking Factor Peaking Factor Peaking Factor <br /> <br /> Mimmum 0.12 1.1 1,2 1.4 <br /> Average 0 15 1 2 1,4 1.7 <br /> Maximum 0.19 1 3 1.7 2 4 <br /> <br />MWMC 4 0 REV9 DOC 4-9 <br /> <br /> <br />