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MWIvlC FACILITIES PLAN <br /> <br /> Mitigation of potential negative impacts of MWMC facilities on adjacent uses and <br /> surrounding neighborhoods (ensuring that MWMC facilities are "good neighbors" as <br /> judged by the community) <br /> <br /> P annin§ Assumptions <br />Listed below are the assumptions that were made regarding the future regulatory <br />requirements for Eugene-Springfield, which are based on the current National Pollutant <br />Discharge Elimination System (NPDES) wastewater discharge permit issued in May 2002. It <br />should be noted that as water quality and fish concerns change over time, future discharge <br />permits may contain different standards to protect the Willamette River's defined beneficial <br />uses. However, the current permit conditions are anticipated to remain in effect through <br />2025. <br /> <br /> Dry season concentration limits will be set to the current Willamette River basi.~ <br /> standards of 10 mg/L for carbonaceous biochemical oxygen demand (CBOD) and total <br /> suspended solids (TSS) on a monthly average basis. <br /> <br /> Dry season mass limits for CBOD and TSS will remain the same as in the existing <br /> discharge permit and will be based on the dry season flow. <br /> <br /> Wet season concentration limits will remain the same as in the existing discharge permit. <br /> <br /> Wet season mass limits for CBOD a_nd TSS will remain the same as in the existing <br /> discharge permit and will be based on wet season flow. <br /> <br /> Dry and wet season monthly average percent removal for CBOD and TSS will remain at <br /> 85 percent, the same as the existing discharge permit. <br /> <br /> Wet season maximum day mass limits will be suspended when the plant flow is equal to <br /> or greater than twice the dry season design rating of the plant, the same as the existing <br /> discharge permit. <br /> <br /> The dry season ammonia concentration limits will remain the same as in the existing <br /> discharge permit. <br /> <br /> The excess thermal load limit in the dry season will remain the same as in the existing <br /> discharge permit. <br /> <br />~ The current limitation for effluent disinfection is based on E. Col£ It is assumed that the <br /> E. Coli limit will remain the same as in the existing discharge permit. <br /> <br />· The effluent pH lirrtit will remain the same as in the existing discharge permit. <br /> <br />Projected Wastewater Flows and Capacity Needs <br /> <br />The Facilities Plan includes projections of wastewater flows and loads to the year 2025, at 5- <br />year intervals, and for the build-out condition (estimated year 2050) for domestic and <br />industrial sources. Average, maximum month, maximum week, and maximum day flow <br />ranges and loads were determined for both dry and wet seasons. Domestic [residential and <br /> <br />ES-2 MWMC_EXEC,SUM_REV4_ 2.~ DOC <br /> <br /> <br />