Page 1 of 11
COMMERCIAL SEPTIC SYSTEM INSTALLER EXAM
COMPLETE QUESTIONS AND DETAILED SOLUTIONS
LATEST UPDATE THIS YEAR
QUESTION: 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. - ANSWER-150
QUESTION: True or False: Walls, bottoms, and lids of poured-in-place septic tanks should have a
minimum thickness of four inches (4"). - ANSWER-True
QUESTION: Tank lids shall be constructed in ______________________ pieces and shall have
securable, removable access openings located so that the inlet and outlet tees can be
________________________________. - ANSWER-one or two,
readily accessed.
QUESTION: Access opening shall have a minimum of _________________ and maximum of
___________________ free space. - ANSWER-Minimum: 15"
Maximum: 24"
QUESTION: Tanks with more than 12 inches of cover must extend access openings to within
______ inches of the ground surface. - ANSWER-12
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QUESTION: All tanks shall be equipped with ________________________________ rated or
equivalent tees at the inlet and outlet ends of the tank. - ANSWER-Four inch (4") PVC, ASTM
3034
QUESTION: Tees shall be constructed so they extend into the liquid a minimum of
____________________ and a maximum of __________________ of the liquid depth of the
tank. - ANSWER-Min: 25%
Max: 50%
QUESTION: The invert of the outlet tee shall be located _______________ inches below the
invert of the inlet tee. - ANSWER-two inches
QUESTION: __________________ tees shall be equipped with an approved effluent filter. -
ANSWER-Outlet
QUESTION: Concrete used for poured-in-place or pre-cast septic tanks shall have a minimum
________________________. - ANSWER-28 day compressive strength of 4000 pounds per
square inch.
All tanks must have: - ANSWER-2 compartments
2
COMMERCIAL SEPTIC SYSTEM INSTALLER EXAM
COMPLETE QUESTIONS AND DETAILED SOLUTIONS
LATEST UPDATE THIS YEAR
QUESTION: 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. - ANSWER-150
QUESTION: True or False: Walls, bottoms, and lids of poured-in-place septic tanks should have a
minimum thickness of four inches (4"). - ANSWER-True
QUESTION: Tank lids shall be constructed in ______________________ pieces and shall have
securable, removable access openings located so that the inlet and outlet tees can be
________________________________. - ANSWER-one or two,
readily accessed.
QUESTION: Access opening shall have a minimum of _________________ and maximum of
___________________ free space. - ANSWER-Minimum: 15"
Maximum: 24"
QUESTION: Tanks with more than 12 inches of cover must extend access openings to within
______ inches of the ground surface. - ANSWER-12
1
, Page 2 of 11
QUESTION: All tanks shall be equipped with ________________________________ rated or
equivalent tees at the inlet and outlet ends of the tank. - ANSWER-Four inch (4") PVC, ASTM
3034
QUESTION: Tees shall be constructed so they extend into the liquid a minimum of
____________________ and a maximum of __________________ of the liquid depth of the
tank. - ANSWER-Min: 25%
Max: 50%
QUESTION: The invert of the outlet tee shall be located _______________ inches below the
invert of the inlet tee. - ANSWER-two inches
QUESTION: __________________ tees shall be equipped with an approved effluent filter. -
ANSWER-Outlet
QUESTION: Concrete used for poured-in-place or pre-cast septic tanks shall have a minimum
________________________. - ANSWER-28 day compressive strength of 4000 pounds per
square inch.
All tanks must have: - ANSWER-2 compartments
2
