Commercial Septic System Installer
UPDATED ACTUAL Exam Questions and
CORRECT Answers
All tanks must have: - CORRECT ANSWER - 2 compartments
All tanks whether pre-manufactured or constructed on site shall be constructed so that the length
is ___________ compared to the width. - CORRECT ANSWER - at least one and one- half (1
1/2) times... "to the width."
Septic Tanks may be made of: - CORRECT ANSWER - Concrete, Plastic, fiberglass, or other
materials as approved by the department.
Tank compartment partitions will be located: - CORRECT ANSWER - Not less than two-
thirds or more than three-fourths the Length of the tank from the Inlet end.
Compartment partitions will be constructed so a pass-thru hole or slot equal to or greater than the
diameter of the inlet pipe is positioned below the liquid surface with a
_____________________________. - CORRECT ANSWER - Minimum 25% to a maximum
of 50% of the total liquid depth.
Total liquid depth for larger poured-in-place tanks shall have a maximum of
______________inches - CORRECT ANSWER - 66 inches
True or False: Walls and bottom of poured-in-place septic tanks must be reinforced. - CORRECT
ANSWER - True
How can a Septic tank be reinforced? - CORRECT ANSWER - six inch by 6 inch (6"x6")
No.10 gage welded steel reinforcing wire OR fibrous reinforcing material conforming to ASTM
specifications for such materials.
, How must Tank Lids be Reinforced? - CORRECT ANSWER - using three-eights steel
reinforcing rods (rebar) which shall be spaced twelve inches (12") on center each way extending
a minimum of two and one half (2 1/2") inches and a maximum of three (3") from the outside
edge of the tank lid.
In general, the tank must be able to withstand a uniform live load of ______________________
pounds per square foot in addition to all loads to which an underground tank is normally
subjected. - CORRECT ANSWER - 150
True or False: Walls, bottoms, and lids of poured-in-place septic tanks should have a minimum
thickness of four inches (4"). - CORRECT ANSWER - True
Tank lids shall be constructed in ______________________ pieces and shall have securable,
removable access openings located so that the inlet and outlet tees can be
________________________________. - CORRECT ANSWER - one or two,
readily accessed.
Access opening shall have a minimum of _________________ and maximum of
___________________ free space. - CORRECT ANSWER - Minimum: 15"
Maximum: 24"
Tanks with more than 12 inches of cover must extend access openings to within ______ inches
of the ground surface. - CORRECT ANSWER - 12
All tanks shall be equipped with ________________________________ rated or equivalent tees
at the inlet and outlet ends of the tank. - CORRECT ANSWER - Four inch (4") PVC, ASTM
3034
Tees shall be constructed so they extend into the liquid a minimum of ____________________
and a maximum of __________________ of the liquid depth of the tank. - CORRECT
ANSWER - Min: 25%
Max: 50%
UPDATED ACTUAL Exam Questions and
CORRECT Answers
All tanks must have: - CORRECT ANSWER - 2 compartments
All tanks whether pre-manufactured or constructed on site shall be constructed so that the length
is ___________ compared to the width. - CORRECT ANSWER - at least one and one- half (1
1/2) times... "to the width."
Septic Tanks may be made of: - CORRECT ANSWER - Concrete, Plastic, fiberglass, or other
materials as approved by the department.
Tank compartment partitions will be located: - CORRECT ANSWER - Not less than two-
thirds or more than three-fourths the Length of the tank from the Inlet end.
Compartment partitions will be constructed so a pass-thru hole or slot equal to or greater than the
diameter of the inlet pipe is positioned below the liquid surface with a
_____________________________. - CORRECT ANSWER - Minimum 25% to a maximum
of 50% of the total liquid depth.
Total liquid depth for larger poured-in-place tanks shall have a maximum of
______________inches - CORRECT ANSWER - 66 inches
True or False: Walls and bottom of poured-in-place septic tanks must be reinforced. - CORRECT
ANSWER - True
How can a Septic tank be reinforced? - CORRECT ANSWER - six inch by 6 inch (6"x6")
No.10 gage welded steel reinforcing wire OR fibrous reinforcing material conforming to ASTM
specifications for such materials.
, How must Tank Lids be Reinforced? - CORRECT ANSWER - using three-eights steel
reinforcing rods (rebar) which shall be spaced twelve inches (12") on center each way extending
a minimum of two and one half (2 1/2") inches and a maximum of three (3") from the outside
edge of the tank lid.
In general, the tank must be able to withstand a uniform live load of ______________________
pounds per square foot in addition to all loads to which an underground tank is normally
subjected. - CORRECT ANSWER - 150
True or False: Walls, bottoms, and lids of poured-in-place septic tanks should have a minimum
thickness of four inches (4"). - CORRECT ANSWER - True
Tank lids shall be constructed in ______________________ pieces and shall have securable,
removable access openings located so that the inlet and outlet tees can be
________________________________. - CORRECT ANSWER - one or two,
readily accessed.
Access opening shall have a minimum of _________________ and maximum of
___________________ free space. - CORRECT ANSWER - Minimum: 15"
Maximum: 24"
Tanks with more than 12 inches of cover must extend access openings to within ______ inches
of the ground surface. - CORRECT ANSWER - 12
All tanks shall be equipped with ________________________________ rated or equivalent tees
at the inlet and outlet ends of the tank. - CORRECT ANSWER - Four inch (4") PVC, ASTM
3034
Tees shall be constructed so they extend into the liquid a minimum of ____________________
and a maximum of __________________ of the liquid depth of the tank. - CORRECT
ANSWER - Min: 25%
Max: 50%
