OSSF DR TEST PRACTICE EXAM
QUESTIONS AND ANSWERS 2024
______ and ________ soil textural classes are always unsuitable for standard
absorptive OSSF - -class IA and IV
- List each of the major soil horizons - -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. - -Hydraulic
conductivity, saturated, unsaturated
- Interconnected pores in the soil profile allow ______ and _______ to enter the
soil at its surface and migrate downward - -air, water
- List the four components of soil - -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)? - -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? - -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? - -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. - -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? - -846
gals
- Calculate the working liquid capacity (volume) for this septic tank. SEE
PAGE 2-39!! - -1077gals
- What is the surface area (area in square feet) of an evapotranspiration
system 40 feet wide and 65 feet long? - -2,600 sqft
- Figure the acreage for a piece of property that measures 256 feet on each
of four sides. - -1.5 acres
, - Figure the area of a lot that measures 60ft by 280ft - -16,800sqft ,0.39
acres
- A disposal option that might be considered in a clay soil would be a
________. - -drip or spray irrigation
- The primary treatment device providing the least or poorest treatment of
domestic wastewater would be _______. - -septic tank
- Nitrogen or nitrate removal in soil occurs by _________. - -vegetation uptake
- The factors influencing the survival of bacteria in soil are _______. - -
moisture, temperature, pH, and organic matter.
- Physical removal of bacteria by straining occurs when _______. - -the
bacteria are larger than the pore openings in the soil
- A solid that can be filtered out of the wastewater is a _________. - -
suspended solid
- Which of the following describes domestic wastewater as it leaves a home?
- -fresh, light in color, has dissolved oxygen
- Which of the following are problems caused by malfunctioning septic tank
systems? - -surface water pollution, groundwater contamination, and
standing sewage in neighborhoods
- An inorganic chemical that affects human health is - -nitrate
- Parasites (helminths) found in untreated sewage include ________. - -
hookworm, round worms, and tapeworms
- Viruses are responsible for such diseases as - -poliomyelitis and infectious
hepatitis
- A type of bacteria that indicates sewage contamination is ________. - -fecal
coliform
- Protozoa are very simple animal organisms that may cause ________. - -
amoeba dysentery and Giardiasis
- Waterborne diseases that spread by pathogenic bacteria include _________.
- -typhoid, cholera, and dysentery
QUESTIONS AND ANSWERS 2024
______ and ________ soil textural classes are always unsuitable for standard
absorptive OSSF - -class IA and IV
- List each of the major soil horizons - -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. - -Hydraulic
conductivity, saturated, unsaturated
- Interconnected pores in the soil profile allow ______ and _______ to enter the
soil at its surface and migrate downward - -air, water
- List the four components of soil - -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)? - -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? - -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? - -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. - -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? - -846
gals
- Calculate the working liquid capacity (volume) for this septic tank. SEE
PAGE 2-39!! - -1077gals
- What is the surface area (area in square feet) of an evapotranspiration
system 40 feet wide and 65 feet long? - -2,600 sqft
- Figure the acreage for a piece of property that measures 256 feet on each
of four sides. - -1.5 acres
, - Figure the area of a lot that measures 60ft by 280ft - -16,800sqft ,0.39
acres
- A disposal option that might be considered in a clay soil would be a
________. - -drip or spray irrigation
- The primary treatment device providing the least or poorest treatment of
domestic wastewater would be _______. - -septic tank
- Nitrogen or nitrate removal in soil occurs by _________. - -vegetation uptake
- The factors influencing the survival of bacteria in soil are _______. - -
moisture, temperature, pH, and organic matter.
- Physical removal of bacteria by straining occurs when _______. - -the
bacteria are larger than the pore openings in the soil
- A solid that can be filtered out of the wastewater is a _________. - -
suspended solid
- Which of the following describes domestic wastewater as it leaves a home?
- -fresh, light in color, has dissolved oxygen
- Which of the following are problems caused by malfunctioning septic tank
systems? - -surface water pollution, groundwater contamination, and
standing sewage in neighborhoods
- An inorganic chemical that affects human health is - -nitrate
- Parasites (helminths) found in untreated sewage include ________. - -
hookworm, round worms, and tapeworms
- Viruses are responsible for such diseases as - -poliomyelitis and infectious
hepatitis
- A type of bacteria that indicates sewage contamination is ________. - -fecal
coliform
- Protozoa are very simple animal organisms that may cause ________. - -
amoeba dysentery and Giardiasis
- Waterborne diseases that spread by pathogenic bacteria include _________.
- -typhoid, cholera, and dysentery
