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EXECUTIVE SUM~RY <br /> <br />TABLE ES-t <br />AJtematives Selected for System Evaluation <br />MWMC Facilities Plan, Eugene-$p#ng§eld <br /> <br /> Estimated Cost <br /> System Alternative (Millions of 2004 Dollars) Meets Planning Objectives <br /> <br />1 - No Action No <br />2 - Full Primary and Secondary $233 million Meets Most <br />3- FuJi P~ma~ $167 tuition Mee~ Mo~ <br />4- High Rate Cla~aon $157 tuition Meets All <br />5 - Parallel PHma~ Se~nda~ $144 million M~s Ail <br /> <br />Recommended Plan <br />Alternative 5 is the recommended set of facilities improvements to meet al~ of the 2025 <br />planning criteria. It is the least cost set of facffities that can be constructed to meet the peak <br />flow management and water quality requirements. The project phasing for the preferred <br />system solution (Alternative 5)/s shown in Figure ES-3, and represents the thirteen initial <br />project phases. Figure ES-3 does not show offsite projects, such as the hnprovements to <br />conveyance pump stations, the $IV~,rF, the Biocycle Farm, and the BMF fac/l~ties. <br /> <br />Alternative 5 meets all planning criteria a_nd requirements, and is the least-cost alternative, <br />at $144 million in 2004 dollars. Because this option involves parallel use of the ex/sting <br />primary and secondary treatment systems in peak wet weather events, it minimizes the <br />need for new secondary treatment systems that would only be used in peak wet weather <br />events (and thereby underu~l~zed for most of the year), but it is untested &om a regulatory <br />standpoint. <br /> <br />There remains uncertainty surrounding fi~ture blending policy and it ~s possible that the <br />Oregon DEQ may not approve the proposed systemwide solution. Therefore, the next best <br />systemwide alternative (Alternative 4), which includes the addition of High-Rate <br />Clarification, may be implemented as a contingency plan. The alternative is identical to the <br />preferred solution with the exception that High-Rate Clarification is provided ir~ addition to <br />conventional primary clarification, and parallel primary secondary peak flow management <br />is elflninated. If the High-Rate Clarification alternative is required by DEQ for regulatory <br />purposes, an additional $13 million (2004 dollars) in project cost would be requ/~ed in <br />phase 5. <br /> <br />MWMC_EXECSUM_REV4_2_ DOC ES-5 <br /> <br /> <br />