town of falmouth ma new silver beach wastewater system · 2017. 10. 17. · • process flow –...
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TownofFalmouthMA
NewSilverBeachWastewaterSystemNEWEASmallCommunitySeminar
7/15/16
AmyLowellTownofFalmouthWastewaterSuperintendent
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Outline
• Background/Planning/PermiIng• Design• ConstrucKon• Costs• OperaKon• Lowflowchallenges• Performance
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NewSilverBeach(NSB)AreaBackground
• Seasonalcommunitydevelopedaroundamarsh,nexttothebeach
• ARerextremestormevent,BoardofHealthdeclaredahealthemergencyduetosepKcsystem/cesspoolissues
• BoardofHealthbegantheprocessofplanningasewersystem
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5
ProjectAlternaKvesIndividualonsitetreatmentsystems• Smalllots,insufficientdepthtogroundwater.66properKeswouldneedhighmoundwithconcreteretainingwall
TightTanks• EsKmateneedpumpoutevery8daysinsummer(if2000gall)SeveralTreatmentPlantSites• Severalsitesfellthrough-unwillingsellersorotherdeadendsPumptoMainWWTF• Wouldhaverequired~4.2mileforcemainand2liRstaKons• Consideredlaterinprocess–wouldhaveneedednewpermiIng,addiKonalKme,loseloan,etc
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PermiIngHistory• 3permits,allappealed
• Wetlandpermitfortreatmentplant• WetlandpermitforcollecKonsystem• Groundwaterdischargepermit
• TownulKmatelyprevailed• Processtookmanyyears–bidprojecttwice
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Design
• ServiceArea:~220singlefamilyresidenKalhomesinNSBarea+NorthFalmouthElementarySchool
• OneliRstaKon,2smallgrinderpumpstaKonsserving3-5homes(municipal,locatedwithinroadrightofway)
• ~2milesofgravitymain,~1mileofFM• WWTF• EffluenttoinfiltraKonbedsbeneathschoolsoccerfield(byproject)
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Design (Con,nued)
• DesignFlows–basedonTitleVfactors• 40,000gpdpeakflowfromservicearea+15,000peakflowschool=55,000gpd.Roundedupto60,000gpdtotal.
• DischargePermitLimits:• TotalSuspendedSolids=30mg/L• BiochemicalOxygenDemand=30mg/L• TotalNitrogen(andnitrate)=10mg/L
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Construc,on
• Took~1yeartocomplete• MainconstrucKonchallenges:Dewatering,exisKnguKliKesinpoorcondiKonandlocaKonsnotwellrecorded,bulkhead,smallWWTFsiteadjacenttowetlandsattheendofaresidenKalstreet
• Startedup2009
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WWTF Site Before Construc,on
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WWTF Near Comple,on
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Li? Sta,on
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Shared municipal grinder pump – before and a?er modifica,on
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Project Appropria,on and Borrowing
Year Amount Appropriated 1997 $3,567,000 2002 $1,200,000 2006 $7,733,000
$12,500,000
Borrowed Bonded Total $1,650,000 SRF Loan Total – DEP held 0% $7,775,000
Total: $9,425,000
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Cost Appor,onment
TotalFinalProjectCostforBejerment $9,103,055.82
PaidByPropertyOwners-Bejerments(70%) $6,372,139.07
PaidByTown(30%) $2,730,916.74
NumberofAssessedProperKes 231
BejermentCostPerProperty $27,585.02
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Opera,on
• Processflow–FineScreen,InfluentEqualizaKonTank,WetWell,SequencingBatchReactors,EffluentEQTank,[UV–notrequiredyet]
• SequencingBatchReactors–Fluidyne• ChangedfromKme-basedcontroltodissolvedoxygencontrolaRerstartup–withfluctuaKnginfluentflowverydifficulttogetconsistentperformanceusingKme-basedcontrol
• Nosludgehandlingonsite.Removesludgeasnecessary,trucktomainWWTFforthickening/disposal.
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NSBWWTFEffluentFlowOverthePast~5Years(gpdx1000)
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Low Flow Challenges
• LowflowmeansmorevariableinfluentconcentraKons• IndividualdischargersandeventscanhaveasignificantimpactontheWWTF,especiallyduringlowflowperiods–ex:schoolfloorcleaning
• SeasonalflowchangesrequireseasonaloperaKonaladjustments–tanksetpointlevels,cycleKmes,etc
• Seasonalriseandfallisnotsteady–alsofluctuatesdaytoday• TimeforO&MisnotproporKonaltoflow• Plantperformance/dischargepermitcangetasmuchajenKonfromregulatorsandothersashigherflowpermit(ajenKonalsonotproporKonaltoflow)
• Despitechallenges,WWTFhasgenerallyperformedquitewell
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NSBWWTFInfluentandEffluentBiochemicalOxygenDemandOverthePast~5Years(mg/L)
Inf Eff Permit
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NSBWWTFInfluentandEffluentTotalSuspendedSolidsConcentraMonOverthePast~5Years(mg/L)
Inf Eff Permit
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Inf Eff Permit
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NSBWWTF-CumulaMveInfluentandEffluentNitrogenLoad(lbs)
OverthePast5YearsCumulaKveInfTNLoad CumulaKveEffTNLoad
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Ques,ons?