Need to Know:



Designer - Need to KnowA designer will locate and design the onsite wastewater treatment system using good design judgment and relies on appropriate design methods and calculations.The Professional will have essentialDemonstrate kKnowledge of Wwastewater Ccharacteristics Nneeded to effectively Ddesign septic Onsite Wastewater Treatment sSystems.Wastewater sourcesDomesticNon-DomesticCommercialDefinitionGeneral solutionsNon-sewage wastesDefinitionsolutionsHydraulicsDetermine flows from single familyresidential dwelling homes up to 9 homes in a clusterDetermine the number of bedroomsDetermine the number of fixturesDetermine flows for clusters greater then 9 homesDetermine flows from other establishmentsnon-residential dwellingUse applicable Arizona Administrative Code provisionsMeasuredPeak daily flow for tank sizingPeak 7 day for drainfield sizingBiomat developmentPart-time and vacation useEstimated“A” section of the manual - how to interpretWaste sStrengthDemonstrate knowledge of definition, impacts upon the onsite wastewater treatment system, and typical amounts of wastewater characteristicsBiochemical oxygen demand (BOD)Understand measurement and typical valuesCalculate BOD loadingUnderstand how it impacts systemsTotal suspended solids (TSS)Understand measurement and typical valuesUnderstand how it impacts systemsFats, oils, and grease (FOG)Understand measurement and typical valuesUnderstand how can impact systemsOther components pollutants of wastewatersource waterBacteria and virusesDefinitionFecal ColiformImpacts on onsite wastewater treatment systemsNitrogen DefinitionCycle throughout systemImpacts on onsite wastewater systemsTreatmentPhosphorus DefinitionImpacts on onsite wastewater systemsTreatmentDissolved oxygen (DO)DefinitionImpacts on onsite wastewater systemsTreatmentTemperatureDefinitionImpacts on onsite wastewater systemsTreatmentChemicalsTypesPharmaceuticalsHousehold chemicalsDetergentsFabric softenersDisinfectantsHazardous wasteDefinitionsImpacts on onsite wastewater treatment systemsTreatmentWater treatment devicesWater softenersReverse osmosis unitsCommercial ice makersImpacts on onsite wastewater treatment systemsMiscellaneousSanitary wipesGray waterImpacts on onsite wastewater treatment systemsUnderstand Interpret Site Characteristicsgeneral design principals, rule limitations and Cconstructability iIssues.A designer needs to be able to interpret site characteristics and identify all constructability ographySlopes, elevations, and benchmarksUpslope conditions -Avoiding surface water run-on/DdiversionsSlopes, elevations and benchmarksDownslopes and surfacingSystem Onsite wastewater treatment system orientation to slopeSoilsCoarse sand treatment concernsHeavy clay acceptance and smearing concernsPlastic limit Above ground system requiredPercent rockProperty boundaries, improvement, obstructions, easements, and setbacksVertical separationLimiting conditionsSpecial equipment neededAccessibility for installation and maintenanceEquipment limitationsTraffic patterns to minimize compactionMaximum lift of typical pump trucksWinter operation and protection from freezingImpact to siteDemonstrate Design of Understand and design Ccollection and bBuilding sSewers from single family homesBasement grinder and injector pump consideration Building sewersAcceptable pipe materialsSlopeDiameterMin and max depthsFreezingCleanoutsAccessibilityDiameterSpacingBasement grinder and injector pump consideration Consequences for septic tankDemonstrate the treatment achieved and properS sizing and Installation of sSeptic tTanks sizeTreatment achieved with domestic sewageBODTSSFOGTank sizing for residential dwellingsWith no garbage disposal (GD) or pump in basement (pump)Sizing with GDgarbage disposalsSizing with pumps in basementSizing with both GD garbage disposals and pump in basement Tank sizing for other establishmentsnon-residential dwellingsFlammable waste trapWhen requiredProper designCompartmentalizedCompartmentalizationDouble chambersSingle chambers in sequenceBury depthTankRisersInspection pipesBuoyancy calculationsSetbacks, easementsEffluent filtersscreensTypesApplicationsDemonstrate Knowledge of Applications and Design of Trench and Bed Soil Treatment SystemsDetermine loading ratesTrenchesDetermine size (loading rates given soil textures, structures, and percolation rates)Determine geometry (width, height, depth)Number of trenchesLocationTopographySetbacks, easements Unknown buried items (fuel oil tanks, old drainfields)Inspection pipesUsesSize and locationsSecuringDistribution media Rock, pipe, and geotextileChambersGravelless pipeOther mediaDistribution methodsParallelSerialDropboxesDistribution boxes (D-boxes)Distribution valvesGravityPressureSurface water diversion and erosion controlBedsDetermine size (loading rates given soil textures, structures, and percolation rates)Determine geometry (width, height, depth)LocationTopographySetbacksInspection pipesUsesSize and locationsSecuringSurface water diversion and erosion controlDesign a gravity distribution system for trenches and bedsPipe diameter and specificationsPerforation diameter and spacingElevationsDemonstrate Knowledge of Applications and Design of Seepage Pit Soil Treatment SystemsDetermine loading rates Determine size (loading rates given soil textures, structures, and percolation rates)Recognize location limitations based on Arizona soils mapsDemonstrate the Knowledge of aApplicationss and proper Ssizing of a lift stationPump TankDetermine capacityMaintenance access locationDetermine proper dosing frequency and amountDoseFriction lossDrain backBuoyancy calculationsWiringWiring diagrams – licensed electricianControl panelsMaintenance access locationProtection from freezingDrain backBackflow preventer removalTelemetryUnderstand Distinguish When to Useapplications of dDifferent tTypes of pPumpsSumpEjectorGrinderTurbineCentrifugalMulti-stage?Demonstrate Aability to Ssize Ppumps Bbased on the AapplicationBlock requirementCalculating total dynamic headCalculating gallons per minuteSiphonsUneven pressure distributionUnderstand how to Demonstrate Knowledge of Applications and Design of design a Ppressure dDistribution sSystemsIdentify when requiredDesign to assure Design hydraulic componentseven distributionAcceptable pipe diameter and specificationsLateral spacing, perforation diameter, and perforation spacingDesign for pipes at different elevationsGoal is even distributionDemonstrate knowledge of applications and design of trench and seepage beds systemsDetermine loading rates given soil textures, structures and percolation ratesTrench Determine sizing (loading rates given soil textures, structures and percolation rates) and geometry (width, height, depth)LocationTopographySetbacks, easements Unknown buried items (fuel oil tanks, old drainfields)Inspection pipesUsesSize and locationsSecuringDesign for different distribution mediaRock, pipe and geotextileChambersGravelless pipeOther media not specified in Chapter 7080 Surface water diversion and erosion controlBedsDetermine sizing (loading rates given soil textures, structures and percolation rates) and geometry (width, height, depth)LocationTopographySetbacksInspection pipesUsesSize and locationsSecuringDistribution methodsGravityPressureSurface water diversion and erosion controlDesign a gravity distribution system for trenches and bedsPipe diameter and specificationsPerforation diameter and spacingDrop BoxesUseSpecificationsDistribution BoxesUseSpecifications Demonstrate Kknowledge of aApplications and Ddesign of At-grade SsystemsIdentify types of at-grade systemsDetermine sizing size and linear loading rate (loading rates given soil textures, structures, and percolation rates)Determine ) and geometry (width, height, depth)LocationTopographySetbacksUnknown buried items (fuel oil tanks, old drainfields)Distribution media Rock, pipe, and geotextileChambersGravelless pipeOther mediaDistribution methodsParallelSerialDropboxesDistribution boxes (d-boxes)Distribution valvesGravityPressureEvenUnevenInspection pipesUsesSize and locationsSecuringMore than one at-grade unit in designPressure distribution system Uneven pressure distributionSplit an at-grade into sectionSurface water diversion and erosion controlDemonstrate Kknowledge of Aapplications and Ddesign of Mmound SsystemsDetermine sizing and linear loading rate (loading rates given soil textures, structures, and percolation rates)Determine and geometry (width, height, depth)Rock bedAbsorption widthLocationTopographySetbacksUnknown buried items (fuel oil tanks, old drainfields)Inspection pipesUsesSize and locationsSecuringPressure distribution system Uneven pressure distributionSplit a mound into sectionsMultiple mounds in designSurface water diversion and erosion controlDemonstrate Knowledge of Applications and Design of Understand the design of Ggreywater SsystemsIdentify types of greywater systems availableCompare benefits and drawbacks of available greywater systemsCode requirements for a greywater systemCode requirements for designing an onsite wastewater treatment system with a greywater systemDetermining sizing and linear loading rate (loading rates give4nsoil textures, structures and percolation rates) and geometry (width, height and depth) Rock bedabsorption widthLocationTopography, blend mound into landscapesSetbacks, easementsinspection pipesUnknown buried items (fuel oil tanks, old drainfields)Recognize that there is NO sSize reduction for soil treatment area-896599247Understand the design of collector systemsDetermining sizing and linear loading rate (loading rates give4nsoil textures, structures and percolation rates) and geometry (width, height and depth) Rock bedabsorption widthLocationTopography, blend mound into landscapesetbacks, easementsinspection pipesUnknown buried items (fuel oil tanks, old drainfields)Calculating wastewater flow. Demonstrate Knowledge of Applications and Design of Demonstrate knowledge of applications and design of Alternative SystemsHolding TanksUseCapacityAccessAlarm Emergency overflowMaintenance contractFlood plainLocation – flood fringeNo inspection pipesPump shut off and backflow preventionIf tank is covered with water sewage generation must stopMound designRock bed elevation Inspection pipesHolding tank sizingMaintenance after a floodPrivies3 foot separation requirement or over a vaultSetbacksMust have 25 ft3 of capacityVentingMaintenance Demonstrate knowledge of types of systems and regulatory requirements with Other systemsRegulatory requirements3 feet of soil treatmentMedium sand or finerLoad at a rate of no greater than 1.2 gpd/ft2Flow measurement, monitoring and mitigation planTypes of systemsMounds built on unnatural soil or with less the 12” of unsaturated soilPartially buried systemsTile drainageSoil treatment system downsized but not loaded at greater than 1.2 gpd/ft2Sand or peat filters with soil treatment systems totaling 3 feet of soil treatmentDemonstrate knowledge of types of systems and regulatory requirements with Performance systemsRegulatory requirementsFlow measurement, monitoring and mitigation planOperating PermitMust have “some separation”25’ horizontally from the system fecal coliform = 0If lot adjoins a lake the total phosphorus must be <1 mg/l 50 feet from the systemTypes of systemsSoil treatment system downsized loaded greater than 1.2 gpd/ft2Non-soil based pretreatment units followed by less then 3’ of separationATUGravel filtersTextile filtersConstructed wetlandsDemonstrate general knowledge about system operation, performance and applications drip distribution.DefinitionTreatment processApplicationsPerformanceDemonstrate general knowledge about system operation, performance and applications of pretreatment technologies.Aerobic treatment unitsDefinitionTreatment processApplicationsPerformanceMedia FiltersDefinition and TypesSandPeatTextileGravelOtherRecirculatingTreatment processApplicationsPerformanceConstructed wetlandsDefinitionTreatment processApplicationsPerformanceDemonstrate general knowledge of design solutions to difficult lots.Small lotsWater conservationSmall field with holding tankPretreatment to reduced sized drainfieldTime dosing from large pump tankLack of unsaturated soilPretreatment technologiesReduced linear loading rateRecycle systemGravelly textured soilPretreatment unitsMound systemsLiner systemsDamaged soilsExcavate outPretreatment Reduced linear loading rateThe Professional must have Demonstrate Ggeneral mMath sSkills.The Professional must be able to demonstrate competency with general math skills.Add, subtract, multiply, and divideSlopeUnit conversionMetric vs. EnglishBasic algebra/geometryGraphing (pump curves)Reading and communication skillsThe professional must have Demonstrate the Aability to dDevelop a mManagement pPlan for the Entire Onsite Wastewater Treatment Ssystem.The professional must have the ability to develop a management plan for the entire onsite wastewater treatment system including all sub-municate plan to owner when availableInclude greywater system-1771654826000Topics Omitted for Advanced/Master DesignerCommercial establishment designflowwaste strengthpretreatmentseptic tank detentionaerobic tankssand filtersSoil treatment sizingCluster designAdvanced Treatment Unit and drip design ................
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