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MODULE 6 QUESTIONS AND ANSWERS WITH SOLUTIONS 2024

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MODULE 6 QUESTIONS AND ANSWERS WITH SOLUTIONS 2024

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  • September 23, 2024
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  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
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MODULE 6 QUESTIONS AND ANSWERS
WITH SOLUTIONS 2024
DisposalSandStreatmentSselectionScriteriaS-SANSWERSPrimaryS-
SOSSFSmustSfunctionSproperlySunderSspecificSsoilSandSotherSconditionsSpresentSofStheSsite.




SecondaryS-SCost,SMinimalSmaintenance,SsimplicitySofSoperation,Slong-termSreliability



TableSXIII:

http://txrules.elaws.us/Gateway/Html//TITLE30/PART1/CHAPTER285/SUBCHAPTERI/285.91/2018-11-
29/HTML/30_0285_0091-21.html



InstallerSISisSableStoSconstructSandSrepairStheseSsystemsS-SANSWERSStandardSAbsorptiveSdrainfield

ETS(unlined)SevaporationSdrainfield

PumpedSeffluentSdrainfields

GravellessSpipeSdrainfield

SoilSSubstitution



*canSinstallSholdingStankSbutSisSextremelySrare




SeeSTableSIXS

http://txrules.elaws.us/Gateway/Html//TITLE30/PART1/CHAPTER285/SUBCHAPTERI/285.91/2018-11-
29/HTML/30_0285_0091-22.html



PipingSinSaShouseSsewerS-
SANSWERSPipeSisStoSbeSconstructedSofScastSiron,SductileSiron,SpolyvinylSchlorideS(PVC)SScheduleS40,Sstandar

dSdimensionSratioS(SDR)SorSotherSapprovedSmaterial.



PipesSinstalledSbeneathSdriveways,Ssidewalks,SorSupStoSsurfaceSimprovementsSmustSuseSsch.S80SPVCSorSslee
vedSsch.S40SPVC

,PipeSfromShouseStoStreatmentSunitSmustSbeSasSlargeSasStheSbuildingSdrain,SbutSnoSsmallerSthanS3SinchSdiam
eter




LineSmustSbeSwatertightSandSaStwo-
wayScleanoutSplugSmustSbeSprovidedSbetweenStheSbuildingSandStheSsepticSsystem



SlopeSofShouseSsewerS-
SANSWERSNoSlessSthanS1/8SinchSfallSperSfootSofSpipe.STheSstubSoutSlocationSshallSbeSatStheShighestSpossibleS

elevation



CleanoutsS-SANSWERSaStwo-
wayScleanoutSplugSmustSbeSprovidedSbetweenStheSbuildingSandStheSsepticSsystem.



AdditionalScleanoutSshallSbeSprovidedSupstreamSandSwithinS5SfeetSofSeveryS90SdegreeSbendSandSatSleastSon
eScleanoutSeveryS100Sfeet



SepticStankS-SANSWERSWidelySusedSon-siteStreatmentSoptionSinSTexas.



BuriedSwatertightStanksSdesignedSandSconstructedStoSreceiveSwastewaterSfromSaShomeSorSaSbusiness.SThey
SseparateSsolidsSfromSliquids,SprovideSlimitedSanaerobicSdigestionSofSorganicSmatter,SstoreSsolids,SandSallow

StheSclarifiedSliquidStoSdischargeSforSfurtherStreatmentSandSdisposal.




SettableSsolidsSandSsludgeSsettleSatStheSbottomSofStheStankSandSaccumulate.SScumSandSotherSlightSmaterialS
riseStoStheStop



PerformanceSofSSepticSTanksS-
SANSWERSPrimaryStreatment,SonlySpartiallyStreatsSeffluentSandSpotentialSforSdiseaseStransmissionSisSvirtual

lySunchangedSfromSrawSwastewater



TheySshouldSremoveS60-70%SofSsuspendedSsolidsSandSoilSandSgreaseSpresentSinSrawSwastewater

,AtSbestSonlyS30-40%SofSBODSisSremoved



CalculatingSsizeSofStankS-
SANSWERSmustSbeSaS2SorS3ScompartmentSdesignSwithS2SorS3StanksSinSaSseriesSorSaSsingleSstructureSwithSmul

tipleScompartments.

-FirstScompartmentSmustScontainS1/2StoS2/3SofStheSrequiredSvolumeSforSaS2ScompartmentStank

-firstScompartmentSmustScontainS1/3SofSrequiredSvolumeS,SbutSnoSlessSthanS500Sgallons



TanksSareSsizedStoSprovideSapproximatelyS2-
3SdaysSdetentionStime.STheSsepticStankSvolumeSisStheSliquidSvolumeSonly.



UsefulnessSofStheSsepticStankSsystemSdecreasesSasStheSsizeSofStheSestablishmentSincreases



SeeSTableSIISinS30STACS285.91Shttp://txrules.elaws.us/Gateway/codepdf//TITLE30/PART1/CHAPTER285/SU
BCHAPTERI/285.91/2018-11-29/PDF/201206290-2.pdf



LocationSofSSepticSTankS-
SANSWERSWithSrespectStoStheShomeSorSbuildingSisSusuallySdeterminedSbyStheSslopeSofStheSlandSandStheSbat

hroomSandSkitchenSplumbingSstubSoutSfromStheShome.



InSnewSconstructionSestablishStheSbestSlocationSdependingSonStheSsoilSforStheSsepticStankSandSdisposalSfield
,SthenSlocateStheShouseSandStheSplumbingSwithin



TableSXSshowsSminimumSdistances



LocateSandSattemptStoSavoidSpublicSwaterSlines,SifSitScannotSbeSavoided,SfollowSrulesStoSminimizeSpotentialS
ofScontamination



AvoidShighStrafficSareasSasSexcessiveSloadsScouldSdamageStheSareas.SLocateStankSnearSaSrouteSwhereSitSisSea
silySaccessibleSforSmaintenance.



AlsoSconsiderSfutureShomeSexpansionSandSadditions

, MaterialsSofSaStankS-SANSWERSSturdy,SwatertightSconstruction,;SappropriateSmaterialsSinclude:

-steel-reinforced,SpouredSinSplaceSconcrete

-steel-reinforced,Spre-castSconcrete

-fiberglass

-reinforcedSplasticSpolyethylene

-OtherSmaterialsSapprovedSbySTCEQ



MetalStanksSareSprohibitedSdueStoScorrosion;SOtherSunacceptableSmaterialsSincludeScinderSblocksSandSwoo
d.



tanksSexhibitingSobviousSleaksSorSdefectsSshouldSnotSbeSused,SbutScondensationSatSconstructionSjointsSisSac
ceptable.



PouredSinSplaceSconcreteStanksSmustSbeSdesignedSbySaSPESwithSrelevantSexperience



AllSpre-
castStanksSshouldSbeSclearlySmarked,Stagged,SorSstampedSwithSmanufacturer'sSnameSandStankScapacity



InternalSDesignSofStheStankS-
SANSWERS2SorS3ScompartmentStanksSareSrequiredSinSTexasSforSsepticSsystem.STheSfirstScompartmentSwillSbe

SasSlargeSorSlargerSthanStheS2ndScompartment,SbutSnoSlessSthanS500Sgallons




ThreeStanksSinSaSseriesSmaySbeSusedSbutStheSfirstStankSmustSbeS1/3SofStheStotalSvolume.S



BafflesSshouldSbeSusedStoSseparateScompartmentsS



MostSsettableSsolidsSwillSbeSremovedSinStheSfirstSchamber.



DesignSRequirementsS(twoScompartment)S-
SANSWERSInflowSlineSatSleastS3SinchesSaboveStankSoperatingSlevel

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