Installer's Test Questions and Answers Top
Rated A+ Latest Version
Question 1
When installing conventional and conventional substitute systems
a) disposal field trenches shall follow the contour of the ground surface
b) a minimum of 6 ft of undisturbed earth shall be required between trenches
c) trenches shall not be excavated when the soil is wet enough to smear or compact
d) all of the above
Answer
d) all the above
Question 2
T/F No system shall be covered without the inspection and authorization of the
Division of Ground Water Protection (GWP)
Answer
T
Page 1 of 16
,Question 3
T/F On a chamber system the height of the cross over trench is to be the same height
as the top row of louvers in the chamber; constructed to hold effluent in the trench to
the height of the top row of louvers
Answer
T
Question 4
What is the Correct length an inlet and outlet tee must extend below the liquid level of
the septic tank?
a) Inlet T 12 inches and outlet T 18 inches or 1/3 of the liquid depth
b) Inlet T 18 inches and the outlet T 18 inches or 1/3 of the liquid depth
c) Inlet T 12 inches and the outlet T 24 inches
d) Inlet T 18 inches and the outlet T 12 inches or 1/3 of the liquid depth
Answer
a) Inlet T 12 inches and outlet T 18 inches or 1/3 of the liquid depth
Question 5
If the permit specifies that the system is to be installed 24 inches deep, this means?
Page 2 of 16
, a) 24 inches from the surface of the ground to the top of the gravel
b) 24 inch from the top of the ground to the bottom of the trench and lines
installed on contour
c) trench depth may vary between 24 to 30 inches
Answer
b) 24 inches from the top of the ground to the bottom of the trench and lines
installed on contour
Question 6
In soils that are approved by percolation tests or evaluated to have absorption rates
higher than 60 MPI LDGP systems require?
a) installation in a 24 inch trench with gravel back fill leveled to the top of the LDGP
b) installation in a 24 inch trench with a quality top soil backfill
c) installation in an 18 inch trench with gravel backfill to the top of the LDGP
d) installation in a 24 inch trench with gravel backfill to 2 inches above LDGP
Answer
a) installation in a 24 inch trench with gravel back fill leveled to the top of the LDGP
Question 7
T/F The minimum/maximum depth of a field line trench is 24-48 inches unless
otherwise specified on the permit
Page 3 of 16
Rated A+ Latest Version
Question 1
When installing conventional and conventional substitute systems
a) disposal field trenches shall follow the contour of the ground surface
b) a minimum of 6 ft of undisturbed earth shall be required between trenches
c) trenches shall not be excavated when the soil is wet enough to smear or compact
d) all of the above
Answer
d) all the above
Question 2
T/F No system shall be covered without the inspection and authorization of the
Division of Ground Water Protection (GWP)
Answer
T
Page 1 of 16
,Question 3
T/F On a chamber system the height of the cross over trench is to be the same height
as the top row of louvers in the chamber; constructed to hold effluent in the trench to
the height of the top row of louvers
Answer
T
Question 4
What is the Correct length an inlet and outlet tee must extend below the liquid level of
the septic tank?
a) Inlet T 12 inches and outlet T 18 inches or 1/3 of the liquid depth
b) Inlet T 18 inches and the outlet T 18 inches or 1/3 of the liquid depth
c) Inlet T 12 inches and the outlet T 24 inches
d) Inlet T 18 inches and the outlet T 12 inches or 1/3 of the liquid depth
Answer
a) Inlet T 12 inches and outlet T 18 inches or 1/3 of the liquid depth
Question 5
If the permit specifies that the system is to be installed 24 inches deep, this means?
Page 2 of 16
, a) 24 inches from the surface of the ground to the top of the gravel
b) 24 inch from the top of the ground to the bottom of the trench and lines
installed on contour
c) trench depth may vary between 24 to 30 inches
Answer
b) 24 inches from the top of the ground to the bottom of the trench and lines
installed on contour
Question 6
In soils that are approved by percolation tests or evaluated to have absorption rates
higher than 60 MPI LDGP systems require?
a) installation in a 24 inch trench with gravel back fill leveled to the top of the LDGP
b) installation in a 24 inch trench with a quality top soil backfill
c) installation in an 18 inch trench with gravel backfill to the top of the LDGP
d) installation in a 24 inch trench with gravel backfill to 2 inches above LDGP
Answer
a) installation in a 24 inch trench with gravel back fill leveled to the top of the LDGP
Question 7
T/F The minimum/maximum depth of a field line trench is 24-48 inches unless
otherwise specified on the permit
Page 3 of 16
