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COMMERCIAL SEPTIC SYSTEM INSTALLER EXAM
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COMMERCIAL SEPTIC SYSTEM INSTALLER EXAM2024-2025
All tanks must contain: - ANSWER: Two compartments
All tanks, whether pre-manufactured or built on-site, must have a length that is
___________ than its width. - Respond at least once and a half (1 1/2) times...
"to the width."
Septic tanks can be made of concrete, plastic, fibreglass, or any other material
allowed by the department.
Tank compartment partitions will be located as follows: - ANSWER Not less
than two-thirds or more than three-fourths of the tank's length measured from
the inlet end.
Compartment partitions will be built in such a way that a pass-through hole or
slot equal to or larger than the diameter of the intake pipe is positioned beneath
the liquid surface with a _____________________________. - ANSWER:
Minimum 25% and maximum 50% of the entire liquid depth.
The total liquid depth for larger poured-in-place tanks shall be a maximum of
66 inches.
True or false: The walls and bottoms of poured-in-place septic tanks must be
reinforced. - The answer is true.
How can a septic tank be reinforced? - ANSWER Six-inch by six inch (6"x6")
No.10 gage welded steel reinforcing wire OR fibrous reinforcing material that
meets ASTM requirements.
, How should tank lids be reinforced? - ANSWER: Use three-eights steel
reinforcing rods (rebar) 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") inches 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 any other loads that
an underground tank is typically subjected to. - Answer 150.
True or false: The walls, bottoms, and lids of poured-in-place septic tanks
should be at least four inches thick. - The answer is true.
Tank lids must be made up of _______________ components and feature
secure, detachable access apertures that allow the inlet and outflow tees to be
_____________________________. - Answer one or two.
Easily accessible.
The access opening must have a minimum of ________________ and a
maximum of ________________ vacant space. - ANSWER: Minimum of 15"
Maximum size: 24".
Tanks with more than 12 inches of cover must have access ports that reach
within ______ inches of the ground surface. - ANSWER 12.
All tanks must have rated or comparable tees at the inlet and outlet ends. -
ANSWER Four inch (4") PVC, ASTM 3034
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