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Resolution No. 4793
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2004 No. 4782-4819
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Resolution No. 4793
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Last modified
6/10/2010 4:49:14 PM
Creation date
7/7/2004 4:37:39 PM
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Template:
City Recorder
CMO_Document_Type
Resolutions
Document_Date
6/28/2004
Document_Number
4793
CMO_Effective_Date
6/28/2004
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MWMC FACILITIES PLAN <br /> <br />FIGURE ES*2 <br />Peak Flow Capacity Deficit <br />MWMC Facilities Plan, Eugene-Springfield <br /> <br /> Current Capacity Additional Capacity Total Capacity Required <br /> Facility (mod) Through 2025 (mgd) in 2025 {mgd) <br /> <br /> A B C=A+B <br />~nfluent Pumping t 75 102 277 <br />Pretreatment 175 102 277 <br />Primary Treatment 90-110 50-70 160 <br />Secondary Treatment 100-110 50-60 160 <br />Disinfection 175 102 277 <br />Outfall 175 102 277 <br /> <br />Alternatives Evaluation <br />As shown in Figure F,S-2, the treatment plant faces a significant peak flow capacity defidt. <br />The WPCF currently has no additional peak flow capacity, and an additional 102 mgd of <br />peak flow capacity is needed by 2025. The Facilities Plan analysis also concludes that in <br />order to meet NPDES permit requirements for ammonia, thermal load and total mass <br />removal, significant improvements to the treatment plant's unit processes are needed. <br /> <br />To solve these projected capacity shortfalls, all available options known to staff and the <br />consultants for resolving the regional treatment facilities capacity and performance <br />constraints were identified. The regulatory requirements and other planning criteria <br />discussed above were translated into a series of evaluation criteria. An evaluation matrix of <br />treatment facility needs and potential solutions was developed and the criteria were <br />applied, which resulted in a set of "preferred" and "acceptable" solutions. The solutions <br />were further evaluated based on compatibility with existing treatment plant processes and <br />on estimated costs, which resulted in the elimination of all but four systemwide alternative <br />solutions. (DEQ requires that a "no action" option be presented, so a total of five options are <br />summarized in the table below.) The final evaluation resulted in the alternatives <br />summarized in Table ES-I, which are the least costly to implement in addition to meeting <br />the stated planning requirements (with the exception of Alternative 1). <br /> <br /> <br />
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