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Exam (elaborations)

OSSF DR TEST PRACTICE QUESTIONS AND ANSWERS 2025/2026

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OSSF DR TEST PRACTICE QUESTIONS AND ANSWERS 2025/2026

Institution
WASHINGTON STATE
Course
WASHINGTON STATE










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Institution
WASHINGTON STATE
Course
WASHINGTON STATE

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Uploaded on
November 5, 2025
Number of pages
17
Written in
2025/2026
Type
Exam (elaborations)
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Questions & answers

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OSSF DR TEST PRACTICE
QUESTIONS AND ANSWERS
2025/2026
_______yandy________ysoilytexturalyclassesyareyalwaysyunsuitableyforystandardyabsorptiveyOSSFy-
yCORRECTyANSWERSyclassyIAyandyIV




Listyeachyofytheymajorysoilyhorizonsy-
yCORRECTyANSWERSysurfaceysoilyA,ysurfaceysoilyB,yandyparentymaterial




_____________yisyaytermydescribingytheyabilityyofywaterytoymigrateythroughyaysoilyprofileyunderyeit
hery_________yory__________yconditions.y-
yCORRECTyANSWERSyHydraulicyconductivity,ysaturated,yunsaturated




Interconnectedyporesyinytheysoilyprofileyallowy______yandy_______ytoyenterytheysoilyatyitsysurfaceya
ndymigrateydownwardy-yCORRECTyANSWERSyair,ywater



Listytheyfourycomponentsyofysoily-yCORRECTyANSWERSyair,ywater,yorganics,yinorganics



Aydrainfieldyisy50yfeetybyy90yfeetyandymustybeycoveredywithyanyaverageyofy15yinchesyofysandyloam.y
Howymanyycubicyyardsyofysandyyloamysoilymustybeypurchasedy(findytheyvolumeyofyayrectangularyob
ject)?y-yCORRECTyANSWERSy208.3ycubicyyards



Whatywouldybeytheyvolumeyofyay5-foot-
diameterypumpytankythatyisy5yfeetytallywithytheyinlety1yfootybelowytheyrim?y-
yCORRECTyANSWERSy587ygals




Whatywouldybeytheypercentyslopeyonyayloty250yfeetydeepythatydropsy20yfeetyinyelevationyoverytheyd
epthyofytheylot?y-yCORRECTyANSWERSy8%

,Howymanyycubicyyardsyofygravelywouldybeyneededytoyfillyayditchy3yfeetydeep,y10yfeetywide,yandy12yf
eetylongywithy18yinchesyofygravel?y1ycubicyyardy=y27ycubicyfeet.y-
yCORRECTyANSWERSy6.67ycubicyyards




Aysepticytankyisy6yfeetyinydiameteryandyisy8yfeetydeep.yHowymanyygallonsywillyityholdyifytheyoverflowy
lineyisylocatedyhalfywayyupyfromytheybottom?y-yCORRECTyANSWERSy846ygals



Calculateytheyworkingyliquidycapacityy(volume)yforythisysepticytank.ySEEyPAGEy2-39!!y-
yCORRECTyANSWERSy1077gals




Whatyisytheysurfaceyareay(areayinysquareyfeet)yofyanyevapotranspirationysystemy40yfeetywideyandy6
5yfeetylong?y-yCORRECTyANSWERSy2,600ysqft



Figureytheyacreageyforyaypieceyofypropertyythatymeasuresy256yfeetyonyeachyofyfourysides.y-
yCORRECTyANSWERSy1.5yacres




Figureytheyareayofyaylotythatymeasuresy60ftybyy280fty-yCORRECTyANSWERSy16,800sqfty,0.39yacres



Aydisposalyoptionythatymightybeyconsideredyinyayclayysoilywouldybeyay________.y-
yCORRECTyANSWERSydripyorysprayyirrigation




Theyprimaryytreatmentydeviceyprovidingytheyleastyorypoorestytreatmentyofydomesticywastewatery
wouldybey_______.y-yCORRECTyANSWERSysepticytank



Nitrogenyorynitrateyremovalyinysoilyoccursybyy_________.y-yCORRECTyANSWERSyvegetationyuptake



Theyfactorsyinfluencingytheysurvivalyofybacteriayinysoilyarey_______.y-
yCORRECTyANSWERSymoisture,ytemperature,ypH,yandyorganicymatter.

, Physicalyremovalyofybacteriaybyystrainingyoccursywheny_______.y-
yCORRECTyANSWERSytheybacteriayareylargerythanytheyporeyopeningsyinytheysoil




Aysolidythatycanybeyfilteredyoutyofytheywastewateryisyay_________.y-
yCORRECTyANSWERSysuspendedysolid




Whichyofytheyfollowingydescribesydomesticywastewateryasyityleavesyayhome?y-
yCORRECTyANSWERSyfresh,ylightyinycolor,yhasydissolvedyoxygen




Whichyofytheyfollowingyareyproblemsycausedybyymalfunctioningysepticytankysystems?y-
yCORRECTyANSWERSysurfaceywaterypollution,ygroundwaterycontamination,yandystandingysewageyi


nyneighborhoods



Anyinorganicychemicalythatyaffectsyhumanyhealthyisy-yCORRECTyANSWERSynitrate



Parasitesy(helminths)yfoundyinyuntreatedysewageyincludey________.y-
yCORRECTyANSWERSyhookworm,yroundyworms,yandytapeworms




Virusesyareyresponsibleyforysuchydiseasesyasy-
yCORRECTyANSWERSypoliomyelitisyandyinfectiousyhepatitis




Aytypeyofybacteriaythatyindicatesysewageycontaminationyisy________.y-
yCORRECTyANSWERSyfecalycoliform




Protozoayareyveryysimpleyanimalyorganismsythatymayycausey________.y-
yCORRECTyANSWERSyamoebaydysenteryyandyGiardiasis
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