TheMWMChasinvestedsignificantlyinthecontrolofwetweatherflows, buttheseinvestmentshavenot <br />yetaddressedI/Ifromprivatelaterals. <br />Wetweatherflows, generatedfrominfiltrationandinflow (I/I) tothesanitarysewercollection <br />system, contribute topeakflows, theassociatedriskofsanitaryseweroverflows, andtothe <br />significantoperatingandmaintenancecostsnecessarytotransportto,andtreatsuch flowsat,the <br />Eugene/Springfield RegionalWaterPollutionControlFacility. EugeneandSpringfieldare <br />investingsubstantial resourcesinthemaintenance ofthepublicwastewatersystemtominimize <br />andcontrolI/I. Thelocallyimplementedsewermaintenance programiseffectiveatsustaining <br />thephysicalintegrity ofthepublicsystemandaddressingareasofthesystemthathavehighrates <br />ofI/I, howevertherehasnotbeenadirectassessmentof itscosteffectivenessinfurtherI/I <br />reduction. Thecapitalprogram continuestofindhighpriorityrepairsaspartofthewastewater <br />rehabilitationprogramandEugeneisdevelopingtheassessmentprocessinconjunction withthe <br />masterplanupdateandcompletionofitswastewatermodel. However, dataindicates thatthis <br />programascurrentlyconfiguredwillnotcontrolpeakwetweatherflowstoalevelthatwill <br />preservethe plannedfunctionallifespanofthepeakwetweatherfacilitiesoftheregional <br />treatment plant.Theabilityoftheprogramtomanagetherisksofwetweatheroverflows tomeet <br />anticipated regulatorystandardsis alsounknown. TheamountofI/Icontributed fromprivate <br />lateralsinthe systemis currentlyunquantifiedbut maybesignificant, baseduponassessments <br />fromother wastewater agenciesandthebestprofessional judgment oflocalstaff. <br />TheMWMC has theauthority tosetstandards for theperformance ofprivatelaterals. <br />TheMWMChasexpressed aninterest inevaluatingtheroleofprivate sanitarysewerlateralsto <br />thecontributionofpeakwetweatherflows, andaddressing thiscontributionif foundtobe <br />significant. TheMWMC hastheauthorityunder itsenabling intergovernmentalagreementtoset <br />standardsforthesanitarysewersystemserving theEugene/Springfield Regional WaterPollution <br />Control Facility. ThecitiesofEugeneandSpringfield havetheresponsibilitytoimplementsuch <br />standardsin theirrespective jurisdictions. <br />Theobjectives fortheanalysisofan I/Ireduction program forprivatesewerlateralsweretoassess, using <br />localdatatotheextent possible, thesignificanceofI/Ifromprivatelateralstothepeakflowsobservedin <br />thesanitarysewercollectionsystemandattheregionalwastewatertreatmentplant. Baseduponthis <br />assessment, adeterminationwouldbemadeaboutwhetherthereductionandcontrol ofI/Ifromprivate <br />lateralscanfurthertheobjectivesoftheworkthatEugene andSpringfieldareperformingunderthe <br />capacity, management, operations, andmaintenanceprogram; ifsuchreductionandcontrolwouldhelp <br />preservetheplannedfunctionallifeoftheexistingpeakwetweathertreatmentfacilities; andwhethera <br />privatelateralprogramwouldbeimportanttoachieveanticipatedregulatorystandardsforwetweather <br />flowmanagement. Ifapositivedeterminationismadeabouttheseoutcomesofaprivatelateralprogram, <br />anoutlinewouldbedevelopedoftheoptionsforaprogramthatwouldserveMWMCthrough <br />implementationinEugeneandSpringfield. <br />SummaryofFindings <br />RegulatoryConsiderations andContext <br />Withintheregulatorycontext, wetweatherflowsareaddressedprimarilyfromanobjectiveofreducing <br />theriskofoverflowsfromsanitarysewersystemsandtopreventtheneedtobypasstreatmentunitswithin <br />wastewatertreatmentfacilities. Forthepastnumber ofyears theU.S. EPAhasadopted anationalfocus <br />onaddressingSSOswithinitsenforcementprogram, andhasdriventhedevelopmentandincorporationof <br />implementationprograms relatedtotheeffective operationandmaintenance ofsanitarysewersystemsin <br />ATTACHMENT 1 <br />Page2of10 Appendix C-52020 Eugene Wastewater Master Plan