Exam (elaborations)
MODULE 6 QUESTIONS AND ANSWERS WITH SOLUTIONS 2024
MODULE 6 QUESTIONS AND ANSWERS WITH SOLUTIONS 2024
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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