Laserfiche WebLink
7.0 Recommended Plan <br /> <br />This chapter documents further development of System Alternative 5, the system expansion <br />and improvement alternative selected in Chapter 6.0, and provides more detailed design <br />and cost information for this alternative. Both collection system and treatment plant <br />improvements recommended as part of this alternative are described. The treatment plant <br />components includes sizing and costing of liquids and solids processes developed in <br />Chapter 6.0. <br /> <br />7.1 Recommended Collection and Conveyance System <br /> Improvements <br /> <br />7.1.1 Collection System <br />A rigorous analysis was made of potential wastewater collection system flow management <br />alternatives as part of the September 2000 MWMC WWFMP (CH2M HILL, 2001). <br />Recommendations included targeted RDII reduction projects and ongoing flow monitoring <br />throughout the collection system. Additional conveyance system improvements beyond <br />targeted RDII reduction via public system rehabilitation as discussed in Chapters 4.0 and 6.0 <br />of this document are not necessary. <br /> <br />7.1.2 Conveyance System <br />Because of the consistency between the hydraulic modeling results for the WWFMP study <br />and the current facilities plan, the conclusions and recommendations made in the WWFMP <br />analysis also remain valid for the current wastewater conveyance system. Those <br />recommendations included pump station upgrades to meet DEQ capacity and redundancy <br />requirements. Recommended pump station improvements based on the current hydraulic <br />model results and the pump station and force main analysis are shown in Table 7.1.2-1, <br />which summarizes the existing and proposed 2025 unit process, equipment, and design <br />criteria. Table 7.1.2-2 (at the end of this chapter) lists the system conveyance design criteria <br />for existing and 2025 capacity needs. <br /> <br />TABLE 7.1.2-1 <br />Recommended Conveyance System Improvements <br />MWMC Facilities Plan, Eugene-Springfield <br /> <br /> Existing <br /> Capacity Recommended Responsible <br /> Pump Station (mgd) Capacity (mgd) Proposed Improvement Entity <br /> <br /> Willakenzie 80.0 127.5 Install additional pump station with MW MC <br /> four new 10 mgd pumps; install new <br /> force main connections. <br /> <br />MWMC_7.0_REV4.DOC <br /> <br /> <br />