1 Exampromax - Stuvia US 2025/2026
OSSF DR TEST PRACTICE Questions and
Answers (100% Correct Answers) Already
Graded A+
_______ and ________ soil textural classes are always unsuitable for
standard absorptive OSSF
Ans: class IA and IV
List each of the major soil horizons
Ans: surface soil A, surface soil B, and parent material
© 2025 Assignment Expert
_____________ is a term describing the ability of water to migrate through
Exampromax - Stuvia US
a soil profile under either _________ or __________ conditions.
Ans: Hydraulic conductivity, saturated, unsaturated
Interconnected pores in the soil profile allow ______ and _______ to enter
the soil at its surface and migrate downward
Ans: air, water
List the four components of soil
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)?
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?
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?
, 2 Exampromax - Stuvia US 2025/2026
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.
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?
Ans: 846 gals
Calculate the working liquid capacity (volume) for this septic tank. SEE
© 2025 Assignment Expert
PAGE 2-39!!
Ans: 1077gals
Exampromax - Stuvia US
What is the surface area (area in square feet) of an evapotranspiration
system 40 feet wide and 65 feet long?
Ans: 2,600 sqft
Figure the acreage for a piece of property that measures 256 feet on each of
four sides.
Ans: 1.5 acres
Figure the area of a lot that measures 60ft by 280ft
Ans: 16,800sqft ,0.39 acres
A disposal option that might be considered in a clay soil would be a
________.
Ans: drip or spray irrigation
The primary treatment device providing the least or poorest treatment of
domestic wastewater would be _______.
Ans: septic tank
Nitrogen or nitrate removal in soil occurs by _________.
, 3 Exampromax - Stuvia US 2025/2026
Ans: vegetation uptake
The factors influencing the survival of bacteria in soil are _______.
Ans: moisture, temperature, pH, and organic matter.
Physical removal of bacteria by straining occurs when _______.
Ans: the bacteria are larger than the pore openings in the soil
A solid that can be filtered out of the wastewater is a _________.
Ans: suspended solid
Which of the following describes domestic wastewater as it leaves a home?
© 2025 Assignment Expert
Ans: fresh, light in color, has dissolved oxygen
Exampromax - Stuvia US
Which of the following are problems caused by malfunctioning septic tank
systems?
Ans: surface water pollution, groundwater contamination, and standing sewage
in neighborhoods
An inorganic chemical that affects human health is
Ans: nitrate
Parasites (helminths) found in untreated sewage include ________.
Ans: hookworm, round worms, and tapeworms
Viruses are responsible for such diseases as
Ans: poliomyelitis and infectious hepatitis
A type of bacteria that indicates sewage contamination is ________.
Ans: fecal coliform
Protozoa are very simple animal organisms that may cause ________.
Ans: amoeba dysentery and Giardiasis
OSSF DR TEST PRACTICE Questions and
Answers (100% Correct Answers) Already
Graded A+
_______ and ________ soil textural classes are always unsuitable for
standard absorptive OSSF
Ans: class IA and IV
List each of the major soil horizons
Ans: surface soil A, surface soil B, and parent material
© 2025 Assignment Expert
_____________ is a term describing the ability of water to migrate through
Exampromax - Stuvia US
a soil profile under either _________ or __________ conditions.
Ans: Hydraulic conductivity, saturated, unsaturated
Interconnected pores in the soil profile allow ______ and _______ to enter
the soil at its surface and migrate downward
Ans: air, water
List the four components of soil
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)?
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?
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?
, 2 Exampromax - Stuvia US 2025/2026
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.
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?
Ans: 846 gals
Calculate the working liquid capacity (volume) for this septic tank. SEE
© 2025 Assignment Expert
PAGE 2-39!!
Ans: 1077gals
Exampromax - Stuvia US
What is the surface area (area in square feet) of an evapotranspiration
system 40 feet wide and 65 feet long?
Ans: 2,600 sqft
Figure the acreage for a piece of property that measures 256 feet on each of
four sides.
Ans: 1.5 acres
Figure the area of a lot that measures 60ft by 280ft
Ans: 16,800sqft ,0.39 acres
A disposal option that might be considered in a clay soil would be a
________.
Ans: drip or spray irrigation
The primary treatment device providing the least or poorest treatment of
domestic wastewater would be _______.
Ans: septic tank
Nitrogen or nitrate removal in soil occurs by _________.
, 3 Exampromax - Stuvia US 2025/2026
Ans: vegetation uptake
The factors influencing the survival of bacteria in soil are _______.
Ans: moisture, temperature, pH, and organic matter.
Physical removal of bacteria by straining occurs when _______.
Ans: the bacteria are larger than the pore openings in the soil
A solid that can be filtered out of the wastewater is a _________.
Ans: suspended solid
Which of the following describes domestic wastewater as it leaves a home?
© 2025 Assignment Expert
Ans: fresh, light in color, has dissolved oxygen
Exampromax - Stuvia US
Which of the following are problems caused by malfunctioning septic tank
systems?
Ans: surface water pollution, groundwater contamination, and standing sewage
in neighborhoods
An inorganic chemical that affects human health is
Ans: nitrate
Parasites (helminths) found in untreated sewage include ________.
Ans: hookworm, round worms, and tapeworms
Viruses are responsible for such diseases as
Ans: poliomyelitis and infectious hepatitis
A type of bacteria that indicates sewage contamination is ________.
Ans: fecal coliform
Protozoa are very simple animal organisms that may cause ________.
Ans: amoeba dysentery and Giardiasis
