Laserfiche WebLink
MWkiC FAC)LIlIES PLAN <br /> <br />TABLE 62.1-4 <br />Facility Requirements for Alternative 2 at 2025 <br />MWMC Facilities Plan, Eugene-Springfield <br /> <br /> Total Required <br /> Secondary Capacity Capacity <br /> NPDES Permit Condition Aeration Basin Clarifiers (mgd) (mgd) <br /> <br />DWMM 2 (4 ceils each) 12 60 59 <br />DW MW 3 (4 celJs each) t 6 86 86 <br />WWMM 3 (4 cells each) 12 119 ~ 11 <br />WWMW 3 (4 cells each) 16 167 t 65 <br /> <br />Results <br />The capital cost comparison and non-monetary comparison are summarized in Table 6.2.1-5. <br /> <br />TAI!~LE 6.2.1-5 <br />Comparison of Facility Requirements, Cost, and Non-monetary Evaluation <br />MWMC Facilities Plan, Eugene-Springfield <br /> <br /> Additional Aeration Additional Secondary Cost <br /> Basins Required ClarJfiers Required (mlllions of Nonmonetary <br /> NPDE$ Permit Condition for 2025 for 2025 do.ars) Evaluation <br /> <br />A~ternative 1 0 2 $19.3 27 <br />Alternative 2 I 8 $39 15 <br /> <br />Alternative 1 is the recommended alternative for secondary treatment improvements. This <br />alternative provides the following advantages: <br /> <br /> Increases bioreactor capacity by increasing the mixed liquor concentration <br /> Modifications can be constructed within the existing infrastructure footprint <br /> Process reduces loading to the secondary clarifiers <br /> Improves sludge settleability and provides for its control <br /> Will provide consistent and complete nitrification <br /> Provides process flexibility for seasonal operation <br />- Operation is more efficient and provides financial benefits <br /> <br /> In addition, alternative 1 is far more cost-effective and maximizes the use of existing <br /> facilities. <br /> <br /> 6.2.2 Secondary Clarification Enhancements <br />As stated in secfiort 6.2.1, the WPCF will need to increase zts secondary treatment peak <br />capacity to address the projected increase in wastewater flows and the ever-cha_rtgLrtg and <br />more restrictive NPDES effluent limitations. The current peak wet weather secondary <br /> <br /> 6-10 MWM6...80_REV'~ 1,DOC <br /> <br /> <br />