OSSF DR TEST PRACTICE | QUESTIONS AND ANSWERS | VERIFIED
ANSWERS GRADED A+ | LATEST EXAM
_______ and ________ soil textural classes are always unsuitable for standard
absorptive OSSF - CORRECT ANSWER - class IA and IV
List each of the major soil horizons - CORRECT ANSWER - 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. - CORRECT
ANSWER - Hydraulic conductivity, saturated, unsaturated
Interconnected pores in the soil profile allow ______ and _______ to enter the
soil at its surface and migrate downward - CORRECT ANSWER - air, water
List the four components of soil - CORRECT ANSWER - 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)? - CORRECT ANSWER -
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? - CORRECT ANSWER - 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? - CORRECT ANSWER - 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. - CORRECT ANSWER - 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? - CORRECT
ANSWER - 846 gals
Calculate the working liquid capacity (volume) for this septic tank. SEE PAGE
2-39!! - CORRECT ANSWER - 1077gals
What is the surface area (area in square feet) of an evapotranspiration system 40
feet wide and 65 feet long? - CORRECT ANSWER - 2,600 sqft
Figure the acreage for a piece of property that measures 256 feet on each of four
sides. - CORRECT ANSWER - 1.5 acres
Figure the area of a lot that measures 60ft by 280ft - CORRECT ANSWER -
16,800sqft ,0.39 acres
A disposal option that might be considered in a clay soil would be a ________. -
CORRECT ANSWER - drip or spray irrigation
The primary treatment device providing the least or poorest treatment of
domestic wastewater would be _______. - CORRECT ANSWER - septic tank
Nitrogen or nitrate removal in soil occurs by _________. - CORRECT
ANSWER - vegetation uptake
The factors influencing the survival of bacteria in soil are _______. -
CORRECT ANSWER - moisture, temperature, pH, and organic matter.
,Physical removal of bacteria by straining occurs when _______. - CORRECT
ANSWER - the bacteria are larger than the pore openings in the soil
A solid that can be filtered out of the wastewater is a _________. - CORRECT
ANSWER - suspended solid
Which of the following describes domestic wastewater as it leaves a home? -
CORRECT ANSWER - fresh, light in color, has dissolved oxygen
Which of the following are problems caused by malfunctioning septic tank
systems? - CORRECT ANSWER - surface water pollution, groundwater
contamination, and standing sewage in neighborhoods
An inorganic chemical that affects human health is - CORRECT ANSWER -
nitrate
Parasites (helminths) found in untreated sewage include ________. -
CORRECT ANSWER - hookworm, round worms, and tapeworms
Viruses are responsible for such diseases as - CORRECT ANSWER -
poliomyelitis and infectious hepatitis
A type of bacteria that indicates sewage contamination is ________. -
CORRECT ANSWER - fecal coliform
Protozoa are very simple animal organisms that may cause ________. -
CORRECT ANSWER - amoeba dysentery and Giardiasis
Waterborne diseases that spread by pathogenic bacteria include _________. -
CORRECT ANSWER - typhoid, cholera, and dysentery
, Microorganisms in wastewater include __________. - CORRECT ANSWER -
bacteria, viruses, protozoa and helminths.
Microorganisms that cause disease are called _________. - CORRECT
ANSWER - pathogens
Domestic wastewater contains microorganisms that are capable of causing
_________. - CORRECT ANSWER - infectious diseases
An official inspector of a new OSSF is a(n) _______. - CORRECT ANSWER
- designated representative
A trench requires 430 cubic feet of gravel. How many cubic yards must be
purchased? - CORRECT ANSWER - 16 cubic yards
A septic tank had a working volume of 31 cubic feet. How many gallons does
this septic tank hold? - CORRECT ANSWER - approx. 232 gals
The area of a lot is 20,076 square feet. What is the area of this lot in acres? -
CORRECT ANSWER - 0.46 acres
A trench measures 30 inches wide. How wide is the trench in feet? -
CORRECT ANSWER - 2.5'
A particular hazard that OSSF installers face that most construction workers do
not is _______. - CORRECT ANSWER - infectious waterborne diseases
List the equipment and procedures to protect a work site. - CORRECT
ANSWER - signs, regulated speed, cones, barricade, high level flags
ANSWERS GRADED A+ | LATEST EXAM
_______ and ________ soil textural classes are always unsuitable for standard
absorptive OSSF - CORRECT ANSWER - class IA and IV
List each of the major soil horizons - CORRECT ANSWER - 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. - CORRECT
ANSWER - Hydraulic conductivity, saturated, unsaturated
Interconnected pores in the soil profile allow ______ and _______ to enter the
soil at its surface and migrate downward - CORRECT ANSWER - air, water
List the four components of soil - CORRECT ANSWER - 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)? - CORRECT ANSWER -
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? - CORRECT ANSWER - 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? - CORRECT ANSWER - 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. - CORRECT ANSWER - 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? - CORRECT
ANSWER - 846 gals
Calculate the working liquid capacity (volume) for this septic tank. SEE PAGE
2-39!! - CORRECT ANSWER - 1077gals
What is the surface area (area in square feet) of an evapotranspiration system 40
feet wide and 65 feet long? - CORRECT ANSWER - 2,600 sqft
Figure the acreage for a piece of property that measures 256 feet on each of four
sides. - CORRECT ANSWER - 1.5 acres
Figure the area of a lot that measures 60ft by 280ft - CORRECT ANSWER -
16,800sqft ,0.39 acres
A disposal option that might be considered in a clay soil would be a ________. -
CORRECT ANSWER - drip or spray irrigation
The primary treatment device providing the least or poorest treatment of
domestic wastewater would be _______. - CORRECT ANSWER - septic tank
Nitrogen or nitrate removal in soil occurs by _________. - CORRECT
ANSWER - vegetation uptake
The factors influencing the survival of bacteria in soil are _______. -
CORRECT ANSWER - moisture, temperature, pH, and organic matter.
,Physical removal of bacteria by straining occurs when _______. - CORRECT
ANSWER - the bacteria are larger than the pore openings in the soil
A solid that can be filtered out of the wastewater is a _________. - CORRECT
ANSWER - suspended solid
Which of the following describes domestic wastewater as it leaves a home? -
CORRECT ANSWER - fresh, light in color, has dissolved oxygen
Which of the following are problems caused by malfunctioning septic tank
systems? - CORRECT ANSWER - surface water pollution, groundwater
contamination, and standing sewage in neighborhoods
An inorganic chemical that affects human health is - CORRECT ANSWER -
nitrate
Parasites (helminths) found in untreated sewage include ________. -
CORRECT ANSWER - hookworm, round worms, and tapeworms
Viruses are responsible for such diseases as - CORRECT ANSWER -
poliomyelitis and infectious hepatitis
A type of bacteria that indicates sewage contamination is ________. -
CORRECT ANSWER - fecal coliform
Protozoa are very simple animal organisms that may cause ________. -
CORRECT ANSWER - amoeba dysentery and Giardiasis
Waterborne diseases that spread by pathogenic bacteria include _________. -
CORRECT ANSWER - typhoid, cholera, and dysentery
, Microorganisms in wastewater include __________. - CORRECT ANSWER -
bacteria, viruses, protozoa and helminths.
Microorganisms that cause disease are called _________. - CORRECT
ANSWER - pathogens
Domestic wastewater contains microorganisms that are capable of causing
_________. - CORRECT ANSWER - infectious diseases
An official inspector of a new OSSF is a(n) _______. - CORRECT ANSWER
- designated representative
A trench requires 430 cubic feet of gravel. How many cubic yards must be
purchased? - CORRECT ANSWER - 16 cubic yards
A septic tank had a working volume of 31 cubic feet. How many gallons does
this septic tank hold? - CORRECT ANSWER - approx. 232 gals
The area of a lot is 20,076 square feet. What is the area of this lot in acres? -
CORRECT ANSWER - 0.46 acres
A trench measures 30 inches wide. How wide is the trench in feet? -
CORRECT ANSWER - 2.5'
A particular hazard that OSSF installers face that most construction workers do
not is _______. - CORRECT ANSWER - infectious waterborne diseases
List the equipment and procedures to protect a work site. - CORRECT
ANSWER - signs, regulated speed, cones, barricade, high level flags
