OSSF DR Test – Questions With Correct Answers (A+)
_______ and ________ soil textural classes are always unsuitable for standard
absorptive OSSF Right Ans - class IA and IV
List each of the major soil horizons Right Ans - surface soil A, surface soil B,
and parent material
_____________ is a term describing the ability of water to migrate through a soil
profile under either _________ or __________ conditions. Right Ans - Hydraulic
conductivity, saturated, unsaturated
Interconnected pores in the soil profile allow ______ and _______ to enter the soil
at its surface and migrate downward Right Ans - air, water
List the four components of soil Right Ans - air, water, organics, inorganics
A drainfield is 50 feet by 90 feet and must be covered with an average of 15
inches of sand loam. How many cubic yards of sandy loam soil must be
purchased (find the volume of a rectangular object)? Right Ans - 208.3
cubic yards
What would be the volume of a 5-foot-diameter pump tank that is 5 feet tall
with the inlet 1 foot below the rim? Right Ans - 587 gals
What would be the percent slope on a lot 250 feet deep that drops 20 feet in
elevation over the depth of the lot? Right Ans - 8%
How many cubic yards of gravel would be needed to fill a ditch 3 feet deep, 10
feet wide, and 12 feet long with 18 inches of gravel? 1 cubic yard = 27 cubic
feet. Right Ans - 6.67 cubic yards
A septic tank is 6 feet in diameter and is 8 feet deep. How many gallons will it
hold if the overflow line is located half way up from the bottom? Right Ans
- 846 gals
Calculate the working liquid capacity (volume) for this septic tank. SEE PAGE
2-39!! Right Ans - 1077gals
, What is the surface area (area in square feet) of an evapotranspiration system
40 feet wide and 65 feet long? Right Ans - 2,600 sqft
Figure the acreage for a piece of property that measures 256 feet on each of
four sides. Right Ans - 1.5 acres
Figure the area of a lot that measures 60ft by 280ft Right Ans -
16,800sqft ,0.39 acres
A disposal option that might be considered in a clay soil would be a ________.
Right Ans - drip or spray irrigation
The primary treatment device providing the least or poorest treatment of
domestic wastewater would be _______. Right Ans - septic tank
Nitrogen or nitrate removal in soil occurs by _________. Right Ans -
vegetation uptake
The factors influencing the survival of bacteria in soil are _______. Right Ans
- moisture, temperature, pH, and organic matter.
Physical removal of bacteria by straining occurs when _______. Right Ans -
the bacteria are larger than the pore openings in the soil
A solid that can be filtered out of the wastewater is a _________. Right Ans -
suspended solid
Which of the following describes domestic wastewater as it leaves a home?
Right Ans - fresh, light in color, has dissolved oxygen
Which of the following are problems caused by malfunctioning septic tank
systems? Right Ans - surface water pollution, groundwater contamination,
and standing sewage in neighborhoods
An inorganic chemical that affects human health is Right Ans - nitrate
Parasites (helminths) found in untreated sewage include ________. Right Ans
- hookworm, round worms, and tapeworms
_______ and ________ soil textural classes are always unsuitable for standard
absorptive OSSF Right Ans - class IA and IV
List each of the major soil horizons Right Ans - surface soil A, surface soil B,
and parent material
_____________ is a term describing the ability of water to migrate through a soil
profile under either _________ or __________ conditions. Right Ans - Hydraulic
conductivity, saturated, unsaturated
Interconnected pores in the soil profile allow ______ and _______ to enter the soil
at its surface and migrate downward Right Ans - air, water
List the four components of soil Right Ans - air, water, organics, inorganics
A drainfield is 50 feet by 90 feet and must be covered with an average of 15
inches of sand loam. How many cubic yards of sandy loam soil must be
purchased (find the volume of a rectangular object)? Right Ans - 208.3
cubic yards
What would be the volume of a 5-foot-diameter pump tank that is 5 feet tall
with the inlet 1 foot below the rim? Right Ans - 587 gals
What would be the percent slope on a lot 250 feet deep that drops 20 feet in
elevation over the depth of the lot? Right Ans - 8%
How many cubic yards of gravel would be needed to fill a ditch 3 feet deep, 10
feet wide, and 12 feet long with 18 inches of gravel? 1 cubic yard = 27 cubic
feet. Right Ans - 6.67 cubic yards
A septic tank is 6 feet in diameter and is 8 feet deep. How many gallons will it
hold if the overflow line is located half way up from the bottom? Right Ans
- 846 gals
Calculate the working liquid capacity (volume) for this septic tank. SEE PAGE
2-39!! Right Ans - 1077gals
, What is the surface area (area in square feet) of an evapotranspiration system
40 feet wide and 65 feet long? Right Ans - 2,600 sqft
Figure the acreage for a piece of property that measures 256 feet on each of
four sides. Right Ans - 1.5 acres
Figure the area of a lot that measures 60ft by 280ft Right Ans -
16,800sqft ,0.39 acres
A disposal option that might be considered in a clay soil would be a ________.
Right Ans - drip or spray irrigation
The primary treatment device providing the least or poorest treatment of
domestic wastewater would be _______. Right Ans - septic tank
Nitrogen or nitrate removal in soil occurs by _________. Right Ans -
vegetation uptake
The factors influencing the survival of bacteria in soil are _______. Right Ans
- moisture, temperature, pH, and organic matter.
Physical removal of bacteria by straining occurs when _______. Right Ans -
the bacteria are larger than the pore openings in the soil
A solid that can be filtered out of the wastewater is a _________. Right Ans -
suspended solid
Which of the following describes domestic wastewater as it leaves a home?
Right Ans - fresh, light in color, has dissolved oxygen
Which of the following are problems caused by malfunctioning septic tank
systems? Right Ans - surface water pollution, groundwater contamination,
and standing sewage in neighborhoods
An inorganic chemical that affects human health is Right Ans - nitrate
Parasites (helminths) found in untreated sewage include ________. Right Ans
- hookworm, round worms, and tapeworms
