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ENVIRONMENTAL REPORT <br /> <br />period could improve water quality in effluent discharge, thus reducing the potential for <br />adverse affects to wfldt/~e, fish, and habitat in the <br /> river. <br /> <br />Construction Period <br />Construction impacts would be temporary and would be primarily related to the <br />installation of a third (bank) ouffall on the Willamette River. Excavation and construction <br />activities at the ouffall site could increase the potential for erosion and the discha~e of <br />sediment into the river. Accidental spills of petroleum product and hazardous material and <br />releases of debr/s and other mater/als used for site construction activities could also occur <br />during the construction period but sound practices would reduce/el/minate river Lmpacts. <br /> <br />Operational Period <br />Compared to System Alternative 1, Lmplementation of System Alternative 5 would Iff<ely <br />result in a net beneficial impact to water quality in the Willamette R/ver. The quality of <br />effluent discharged to the Willamette River, and thus water quality in the Willamette River, <br />would be higher under System Alternative 5 than under System Alternative 1. <br />Implementation of System Alternative 5 would reduce the potential for untreated sewage <br />discharges to the river during peak flow periods. Additionally, under System Alternative 5, <br />water discharged from the WPCF would meet NPDES requirements for TSS and CBODs. <br />Table 9.4.2-1 compares NPDES permit limits for TSS and CBODs with predicted discharges <br />in treated effluent under System Alternative 5. <br /> <br />TABLE 9.4.2-1. <br />Comparison of WPCF NPDES Permit Conditions with Predicted Conditions <br />Under System Alternative 5 (Parallel Primary/Secondary Treatment) <br />MWMC Facilities Plan, Eugene-Springfield <br /> <br /> Permit Limit/Removal Predicted Discharge/Removal <br /> Parameter Requirements Efficiency <br /> <br />Maximum Week TSS 26,000 lb/day 20,550 lb/day <br />Maximum Week CBODs 24,000 lb/day 14,1~ lb/day <br />Maximum Month TSS Removal 85 percent 87.6 percent <br /> <br /> Maximum Month CBQDs 85 percent 86.5 percent <br /> Removal <br /> <br />Uifigation <br /> <br />Construction best management practices (BMPs), including spill prevention, control, and <br />countermeasures (SPCC) planning and sediment and erosion control practSces, wilt be <br />implemented to w2nimize and avoid erosion and the discharge of sediment, petroleum <br />products, hazardous materials, and construction debris from the project site. <br /> <br />9,4.3 Biological Resources <br />Wetland and r/parian areas are the primary habitat types of concern in the vicin/ty ot: the <br />WPCF. Compared to System Alternative 1, System Alternative 5 could result in temporary, <br /> <br />MWMC_9 0_REV14 DOC 9-tt <br /> <br /> <br />