OSSF DR TEST PRACTICE QUESTIONS
AND ANSWERS WITH SOLUTIONS 2024
_______HandH________HsoilHtexturalHclassesHareHalwaysHunsuitableHforHstandardHabsorptiveHOSSFH-
HANSWERHclassHIAHandHIV
ListHeachHofHtheHmajorHsoilHhorizonsH-HANSWERHsurfaceHsoilHA,HsurfaceHsoilHB,HandHparentHmaterial
_____________HisHaHtermHdescribingHtheHabilityHofHwaterHtoHmigrateHthroughHaHsoilHprofileHunderHeitherH
_________HorH__________Hconditions.H-HANSWERHHydraulicHconductivity,Hsaturated,Hunsaturated
InterconnectedHporesHinHtheHsoilHprofileHallowH______HandH_______HtoHenterHtheHsoilHatHitsHsurfaceHandH
migrateHdownwardH-HANSWERHair,Hwater
ListHtheHfourHcomponentsHofHsoilH-HANSWERHair,Hwater,Horganics,Hinorganics
AHdrainfieldHisH50HfeetHbyH90HfeetHandHmustHbeHcoveredHwithHanHaverageHofH15HinchesHofHsandHloam.HHow
HmanyHcubicHyardsHofHsandyHloamHsoilHmustHbeHpurchasedH(findHtheHvolumeHofHaHrectangularHobject)?H-
HANSWERH208.3HcubicHyards
WhatHwouldHbeHtheHvolumeHofHaH5-foot-
diameterHpumpHtankHthatHisH5HfeetHtallHwithHtheHinletH1HfootHbelowHtheHrim?H-HANSWERH587Hgals
WhatHwouldHbeHtheHpercentHslopeHonHaHlotH250HfeetHdeepHthatHdropsH20HfeetHinHelevationHoverHtheHdepth
HofHtheHlot?H-HANSWERH8%
HowHmanyHcubicHyardsHofHgravelHwouldHbeHneededHtoHfillHaHditchH3HfeetHdeep,H10HfeetHwide,HandH12HfeetHl
ongHwithH18HinchesHofHgravel?H1HcubicHyardH=H27HcubicHfeet.H-HANSWERH6.67HcubicHyards
AHsepticHtankHisH6HfeetHinHdiameterHandHisH8HfeetHdeep.HHowHmanyHgallonsHwillHitHholdHifHtheHoverflowHline
HisHlocatedHhalfHwayHupHfromHtheHbottom?H-HANSWERH846Hgals
, CalculateHtheHworkingHliquidHcapacityH(volume)HforHthisHsepticHtank.HSEEHPAGEH2-39!!H-HANSWERH1077gals
WhatHisHtheHsurfaceHareaH(areaHinHsquareHfeet)HofHanHevapotranspirationHsystemH40HfeetHwideHandH65Hfee
tHlong?H-HANSWERH2,600Hsqft
FigureHtheHacreageHforHaHpieceHofHpropertyHthatHmeasuresH256HfeetHonHeachHofHfourHsides.H-
HANSWERH1.5Hacres
FigureHtheHareaHofHaHlotHthatHmeasuresH60ftHbyH280ftH-HANSWERH16,800sqftH,0.39Hacres
AHdisposalHoptionHthatHmightHbeHconsideredHinHaHclayHsoilHwouldHbeHaH________.H-
HANSWERHdripHorHsprayHirrigation
TheHprimaryHtreatmentHdeviceHprovidingHtheHleastHorHpoorestHtreatmentHofHdomesticHwastewaterHwouldH
beH_______.H-HANSWERHsepticHtank
NitrogenHorHnitrateHremovalHinHsoilHoccursHbyH_________.H-HANSWERHvegetationHuptake
TheHfactorsHinfluencingHtheHsurvivalHofHbacteriaHinHsoilHareH_______.H-
HANSWERHmoisture,Htemperature,HpH,HandHorganicHmatter.
PhysicalHremovalHofHbacteriaHbyHstrainingHoccursHwhenH_______.H-
HANSWERHtheHbacteriaHareHlargerHthanHtheHporeHopeningsHinHtheHsoil
AHsolidHthatHcanHbeHfilteredHoutHofHtheHwastewaterHisHaH_________.H-HANSWERHsuspendedHsolid
WhichHofHtheHfollowingHdescribesHdomesticHwastewaterHasHitHleavesHaHhome?H-
HANSWERHfresh,HlightHinHcolor,HhasHdissolvedHoxygen
WhichHofHtheHfollowingHareHproblemsHcausedHbyHmalfunctioningHsepticHtankHsystems?H-
HANSWERHsurfaceHwaterHpollution,HgroundwaterHcontamination,HandHstandingHsewageHinHneighborhoods
AND ANSWERS WITH SOLUTIONS 2024
_______HandH________HsoilHtexturalHclassesHareHalwaysHunsuitableHforHstandardHabsorptiveHOSSFH-
HANSWERHclassHIAHandHIV
ListHeachHofHtheHmajorHsoilHhorizonsH-HANSWERHsurfaceHsoilHA,HsurfaceHsoilHB,HandHparentHmaterial
_____________HisHaHtermHdescribingHtheHabilityHofHwaterHtoHmigrateHthroughHaHsoilHprofileHunderHeitherH
_________HorH__________Hconditions.H-HANSWERHHydraulicHconductivity,Hsaturated,Hunsaturated
InterconnectedHporesHinHtheHsoilHprofileHallowH______HandH_______HtoHenterHtheHsoilHatHitsHsurfaceHandH
migrateHdownwardH-HANSWERHair,Hwater
ListHtheHfourHcomponentsHofHsoilH-HANSWERHair,Hwater,Horganics,Hinorganics
AHdrainfieldHisH50HfeetHbyH90HfeetHandHmustHbeHcoveredHwithHanHaverageHofH15HinchesHofHsandHloam.HHow
HmanyHcubicHyardsHofHsandyHloamHsoilHmustHbeHpurchasedH(findHtheHvolumeHofHaHrectangularHobject)?H-
HANSWERH208.3HcubicHyards
WhatHwouldHbeHtheHvolumeHofHaH5-foot-
diameterHpumpHtankHthatHisH5HfeetHtallHwithHtheHinletH1HfootHbelowHtheHrim?H-HANSWERH587Hgals
WhatHwouldHbeHtheHpercentHslopeHonHaHlotH250HfeetHdeepHthatHdropsH20HfeetHinHelevationHoverHtheHdepth
HofHtheHlot?H-HANSWERH8%
HowHmanyHcubicHyardsHofHgravelHwouldHbeHneededHtoHfillHaHditchH3HfeetHdeep,H10HfeetHwide,HandH12HfeetHl
ongHwithH18HinchesHofHgravel?H1HcubicHyardH=H27HcubicHfeet.H-HANSWERH6.67HcubicHyards
AHsepticHtankHisH6HfeetHinHdiameterHandHisH8HfeetHdeep.HHowHmanyHgallonsHwillHitHholdHifHtheHoverflowHline
HisHlocatedHhalfHwayHupHfromHtheHbottom?H-HANSWERH846Hgals
, CalculateHtheHworkingHliquidHcapacityH(volume)HforHthisHsepticHtank.HSEEHPAGEH2-39!!H-HANSWERH1077gals
WhatHisHtheHsurfaceHareaH(areaHinHsquareHfeet)HofHanHevapotranspirationHsystemH40HfeetHwideHandH65Hfee
tHlong?H-HANSWERH2,600Hsqft
FigureHtheHacreageHforHaHpieceHofHpropertyHthatHmeasuresH256HfeetHonHeachHofHfourHsides.H-
HANSWERH1.5Hacres
FigureHtheHareaHofHaHlotHthatHmeasuresH60ftHbyH280ftH-HANSWERH16,800sqftH,0.39Hacres
AHdisposalHoptionHthatHmightHbeHconsideredHinHaHclayHsoilHwouldHbeHaH________.H-
HANSWERHdripHorHsprayHirrigation
TheHprimaryHtreatmentHdeviceHprovidingHtheHleastHorHpoorestHtreatmentHofHdomesticHwastewaterHwouldH
beH_______.H-HANSWERHsepticHtank
NitrogenHorHnitrateHremovalHinHsoilHoccursHbyH_________.H-HANSWERHvegetationHuptake
TheHfactorsHinfluencingHtheHsurvivalHofHbacteriaHinHsoilHareH_______.H-
HANSWERHmoisture,Htemperature,HpH,HandHorganicHmatter.
PhysicalHremovalHofHbacteriaHbyHstrainingHoccursHwhenH_______.H-
HANSWERHtheHbacteriaHareHlargerHthanHtheHporeHopeningsHinHtheHsoil
AHsolidHthatHcanHbeHfilteredHoutHofHtheHwastewaterHisHaH_________.H-HANSWERHsuspendedHsolid
WhichHofHtheHfollowingHdescribesHdomesticHwastewaterHasHitHleavesHaHhome?H-
HANSWERHfresh,HlightHinHcolor,HhasHdissolvedHoxygen
WhichHofHtheHfollowingHareHproblemsHcausedHbyHmalfunctioningHsepticHtankHsystems?H-
HANSWERHsurfaceHwaterHpollution,HgroundwaterHcontamination,HandHstandingHsewageHinHneighborhoods
