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City Council Agenda Packet 01-27-2014 SpecialAGENDA SPECIALMEETING–MONTICELLOCITYCOUNCIL Monday,January27,2014–6:00p.m. MississippiRoom,MonticelloCommunityCenter Mayor:ClintHerbst CouncilMembers:LloydHilgart,TomPerrault,GlenPosusta,BrianStumpf Others:JeffO’Neill,WSB,WayneOberg,ChuckKeyes(Veolia Water) 1.CalltoOrder 2.PurposeofMeeting:DiscussionofWWTFPhosphorusRemovalFacilityPlan Amendmentandprojectupdates 3.Adjournment WASTEWATERTREATMENTFACILITY(WWTF) PHOSPHORUSREMOVALFACILITYPLANAMENDMENT CITYCOUNCILWORKSHOP JANUARY27,2014 BACKGROUNDINFORMATION AttheMay28,2013meeting,theCityCouncilauthorizedWSBtocompletea PhosphorusReductionFacilityPlanAmendmentfortheWWTFtocomplywiththe MPCA’smandatedNPDESpermitre-issuancerequirements.Includedbelowis additionalbackgroundinformationandasummaryofthestatusoftheFacilityPlan Amendment. Phosphorusiswidelyacceptedasthelimitingnutrientforeutrophication(excessalgae growth)ofsurfacewaters.Controlitandyoucontroleutrophication.TheMinnesota PollutionControlAgency(MPCA)commissionedatotalmaximumdailyload(TMDL) studyofphosphorusenteringLakePepinwhichisdownstreamofMonticelloonthe MississippiRiver.TheTMDLstudydeterminedtheannualphosphorusloadingthat LakePepincouldassimilateandyetmaintainacceptablewaterquality.TheMPCA thenapportionedthisacceptableloadingtowastewatertreatmentfacilitiesupstreamof LakePepin.TheCityofMonticello’sapportionmentis2,608kilogramsofphosphorus peryearwhichequatesto5,740poundsperyear. EXISTINGSITUATION TheCity’sexistingwastewatertreatmentfacility(WWTF)iscurrentlyreceivingan annualphosphorusloadingofapproximately25,000poundsinanannualaverageflow of1.106milliongallonsperday(mgd).Thisannualloadingandflowequatestoan influentphosphorusconcentrationof7.42milligramsperliter(mg/l)whichisslightly higherthanwhatisconsideredthetypicalconcentrationfordomesticwastewaterof7 mg/l. TheWWTFdoesanexcellentjobinremovingbiochemicaloxygendemand(BOD)and totalsuspendedsolids(TSS).Italsocurrentlyreducesthe7.42mg/linfluentphosphorus concentrationtoapproximately4.54mg/lintheWWTFeffluent.However,tomeetthe new5,740-poundannuallimitforphosphorusmandatedbythere-issuedNPDES permit,theWWTFmustfurtherreducephosphorustoapproximately1.7mg/lor38% ofthecurrenteffluentlevel. PROCESSTOACCOMPLISHADDITIONALPHOSPHORUSREMOVAL Essentially,therearetwomethodsofremovingadditionalphosphorus,bothofwhich arebeingevaluatedintheFacilityPlanAmendmentstudy: Enhancedbiologicalphosphorusremoval(bioPforshort) Chemicaladdition(chemPforshort) BioPcanbeaccomplishedbychangingoxygenlevelsintheaerationbasins.When oxygenlevelsareallowedtobedepleted,thewastewatermicro-organismsincrease theiruptakeofphosphorus.Additionalphosphorusisthenremovedwithexcess micro-organismsinthesludge(biosolids). TheCity’sexistingWWTFutilizesSanitaireABJsequencingbatchreactors(SBRs)to treatwastewater.TheSBRsareabletobeconvertedtothebioPprocess. Theothermethodofremovingadditionalphosphorusisthroughchemicaladdition (chemP).Thecommonlyusedchemicalsareeitheraluminumsulfate(alum)orferric chloride.Inthecaseofalum,insolublealuminum-phosphateprecipitateisformedand, inthecaseofferricchloride,insolubleferric-phosphateprecipitateisformed.Inboth cases,theinsolubleprecipitatessettleoutandareremovedwiththesludge(biosolids). COSTIMPLICATIONS BioPtypicallyhasahighercapitalcostthanchemPduetotheequipmentandprocess modificationsnecessary.However,ittypicallyhasalowerO&Mcostbecauseongoing chemicalpurchaseisavoided.ChemPtypicallyhasalowercapitalcostthanbioP becauseonlychemicalstorageandfeedequipmentisinvolved.However,ithasthe higherO&Mcostduetoongoingchemicalpurchase. TheFacilityPlanAmendmentwillevaluatebothcapitalandO&McostsforbothbioP andchemPtoidentifythelowestcostalternativeforimplementation. Removaloftheadditionalphosphorusmandatedbythere-issuedNPDESpermitwill increasetheCity’scostofoperatingtheWWTF.Phosphorusremovalcostsintherange of$20to$25perpoundarenotuncommonThiscostincludesbothcapitalandO&M costs. CurrentlytheCityhasextrastrengthchargesinplaceforbothBODandTSS.The FacilityPlanAmendmentmustbesubmittedtotheMPCAbyMarch1st includinga recommendationforaprocesstoaccomplishtherequiredremovallimits.Following thesubmittaloftheFacilityplanamendment,staffwillbeevaluatingthehigh phosphoruscontributorsandwillmakearecommendationastowhethertheCouncil shouldconsiderestablishingextrastrengthchargesforphosphorusduetothehighcost ofitsremoval. COMPLIANCESCHEDULE Thecompliancescheduleinthere-issuedNPDESpermitincludesthefollowing compliancedates. PublicHearingFebruary24,2014 SubmitFacilityPlanMarch1,2014 SubmitPlansandSpecificationsMarch30,2015 InitiateConstructionJune1,2017 AttainComplianceDecember31,2018 WASTEWATERTREATMENTFACILITY(WWTF) CURRENTPROJECTSTATUSREPORT CITYCOUNCILWORKSHOP JANUARY27,2014 COMPUTERUPGRADES ThethreeexistingcomputerworkstationsattheWWTFarenineyearsoldand haveundergonerepairsoverthelastyear.Themotherboardhasfailedinone andneedstobereplaced.Ithasbecomecostprohibitivetocontinuetorepairthe existingcomputers.Itisproposedtoreplacetheexistingthree(3)computer workstations. TheexistingDataHighwayPluscardsintheexistingcomputersareobsoleteand needtobereplacedwithEthernetprotocolconverterstoconnecttheproposed Ethernet-basedcomputerstotheexistingplantcontrollers. TheGraphicUserInterfacesoftwareisalsonineyearsoldandneedstobe upgradedwiththeproposedcomputers.Thegraphicuserinterfacesoftware displaysplantprocessinformationincluding,butnotlimitedto,status,data collection,alarmnotification,reporting,etc.Othersoftwareupgradesinclude updatestoMicrosoftOfficeandMicrosoftWindowsProfessionalOperating System. Thereisanagendaitemfortonight’sCouncilmeetingtoauthorizethecomputer upgradeintheamountof$40,398. SLUDGEDEWATERINGFACILITY Thescrewpressisnowinoperation. Additionalperformancetestingisbeingconductedthisweektooptimizethe polymerdosageanddrysolidscontentofthesludge. Exteriorwork—painting,pavingandsiteworkremainstobecompletedthis spring.Thereisalsominorinteriorworktobecompletedthisspring. FinalcompletiondateisJune30,2014. Sincethescrewpressisnowinoperation,biosolidsarenolongerbeingapplied attheCity’sbiosolidsfarmbutwillfirstbedewateredandthenlandfilled. DewateringisrequiredbytheMPCApriortolandfilling.ChuckKeyes, Manager,MonticelloWastewaterTreatmentFacility,negotiatedanagreement withAdvancedDisposaltoaccepttheCity’sdewateredbiosolidspriortothe screwpressgoingintooperation.ThatagreementwastoexpireinJuly2014, withtheintentofarenewingthecontractforanothertwo(2)years.Earlierthis month,ChuckreceivedaletterfromAdvancedDisposalinforminghimthatthey couldnolongeraccepttheCity’sbiosolidsbecausetheywererunningoutof capacity.Chuckwasabletonegotiatea3-yearcontractwithVoncoII,outof Becker,MNforaslightlylowerratethanthatofAdvancedDisposalwhichwill savetheCityapproximately$2,200peryear.JMEofMonticellowillcontinueto haulthedewateredbiosolids.AlthoughthehauldistancetotheVoncoII landfillisgreaterthanthattotheAdvancedDisposallandfill,JMEwillhonor theirpricingandnotraisetheirhaulingfee. NEWAERATIONBLOWER AtlasCopco(formerlyHSi)hassubmitteddocumentationthatthenextshop drawingsubmittalwillbeincompliancewiththespecifications. TherevisedshopdrawingsshouldbereceivedandapprovedbyFeb1,2014. TheanticipateddeliverydatefortheblowerisJune1,2014.Afterdelivery,the blowerinstallationdesignprojectwillbegin. Thecontractfortheblowerinstallationwillbebidasaseparateprojecttoinstall theblowerandthefollowingadditionalitems: Airflowmeters Newdissolvedoxygen(DO)probes TheairflowmetersandDOprobeswillallowforimprovedairflowcontrol whichwillreduceelectricalcostsandallowforbetteraircontroltoenhance phosphorusremoval. ThenewblowershouldsavetheCityapproximately$25,000peryearinpower costs. ThenewblowerisanticipatedtobeoperationalbySeptember1,2014.