Commercial Septic System Installer Exam Test Questions and Answers
Graded A+
All tanks must have: 2 compartments
All tanks whether pre-manufactured or constructed on site
shall be constructed so that the length is at least one and one- half (1 1/2) times... "to the width."
compared to the width.
Concrete, Plastic, fiberglass, or other materials as ap-
Septic Tanks may be made of:
proved by the department.
Not less than two-thirds or more than three-fourths the
Tank compartment partitions will be located:
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 Minimum 25% to a maximum of 50% of the total liquid
inlet pipe is positioned below the liquid surface with a depth.
.
Total liquid depth for larger poured-in-place tanks shall
66 inches
have a maximum of inches
True or False: Walls and bottom of poured-in-place septic
True
tanks must be reinforced.
six inch by 6 inch (6"x6") No.10 gage welded steel rein-
How can a Septic tank be reinforced? forcing wire OR fibrous reinforcing material conforming to
ASTM specifications for such materials.
using three-eights steel reinforcing rods (rebar) which
shall be spaced twelve inches (12") on center each way
How must Tank Lids be Reinforced? 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 uni-
form live load of pounds per
150
square foot in addition to all loads to which an under-
ground tank is normally subjected.
1/7
, Commercial Septic System Installer Exam Test Questions and Answers
Graded A+
True or False: Walls, bottoms, and lids of poured-in-place
septic tanks should have a minimum thickness of four True
inches (4").
Tank lids shall be constructed in
pieces and shall have
one or two,
securable, removable access openings located
readily accessed.
so that the inlet and outlet tees can be
.
Access opening shall have a minimum
Minimum: 15"
of and maximum of
Maximum: 24"
free space.
Tanks with more than 12 inches of cover must extend
access openings to within inches of the ground 12
surface.
All tanks shall be equipped with
rated or equiva- Four inch (4") PVC, ASTM 3034
lent tees at the inlet and outlet ends of the tank.
Tees shall be constructed so they extend into the liquid a
Min: 25%
minimum of and a maximum of
Max: 50%
of the liquid depth of the tank.
The invert of the outlet tee shall be located
two inches
inches below the invert of the inlet tee.
tees shall be equipped with an
Outlet
approved effluent filter.
Concrete used for poured-in-place or pre-cast
28 day compressive strength of 4000 pounds per square
septic tanks shall have a minimum
inch.
.
When pouring concrete, care should be taken
to assure such operations are not done during
2/7
Graded A+
All tanks must have: 2 compartments
All tanks whether pre-manufactured or constructed on site
shall be constructed so that the length is at least one and one- half (1 1/2) times... "to the width."
compared to the width.
Concrete, Plastic, fiberglass, or other materials as ap-
Septic Tanks may be made of:
proved by the department.
Not less than two-thirds or more than three-fourths the
Tank compartment partitions will be located:
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 Minimum 25% to a maximum of 50% of the total liquid
inlet pipe is positioned below the liquid surface with a depth.
.
Total liquid depth for larger poured-in-place tanks shall
66 inches
have a maximum of inches
True or False: Walls and bottom of poured-in-place septic
True
tanks must be reinforced.
six inch by 6 inch (6"x6") No.10 gage welded steel rein-
How can a Septic tank be reinforced? forcing wire OR fibrous reinforcing material conforming to
ASTM specifications for such materials.
using three-eights steel reinforcing rods (rebar) which
shall be spaced twelve inches (12") on center each way
How must Tank Lids be Reinforced? 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 uni-
form live load of pounds per
150
square foot in addition to all loads to which an under-
ground tank is normally subjected.
1/7
, Commercial Septic System Installer Exam Test Questions and Answers
Graded A+
True or False: Walls, bottoms, and lids of poured-in-place
septic tanks should have a minimum thickness of four True
inches (4").
Tank lids shall be constructed in
pieces and shall have
one or two,
securable, removable access openings located
readily accessed.
so that the inlet and outlet tees can be
.
Access opening shall have a minimum
Minimum: 15"
of and maximum of
Maximum: 24"
free space.
Tanks with more than 12 inches of cover must extend
access openings to within inches of the ground 12
surface.
All tanks shall be equipped with
rated or equiva- Four inch (4") PVC, ASTM 3034
lent tees at the inlet and outlet ends of the tank.
Tees shall be constructed so they extend into the liquid a
Min: 25%
minimum of and a maximum of
Max: 50%
of the liquid depth of the tank.
The invert of the outlet tee shall be located
two inches
inches below the invert of the inlet tee.
tees shall be equipped with an
Outlet
approved effluent filter.
Concrete used for poured-in-place or pre-cast
28 day compressive strength of 4000 pounds per square
septic tanks shall have a minimum
inch.
.
When pouring concrete, care should be taken
to assure such operations are not done during
2/7
