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Georgia Commercial Contractor
Septic Exam Study Guide| Certified
Q&A 2026
Minimum 28 day comprehensive strength of poured in place or pre-cast cement
tanks?- correct-answer - 4000 pounds per square inch.
What are the reinforcing requirements for the walls and base of a poured in place
septic tank?- correct-answer - Minimum 6" x 6" No. 10 gage welded steel
reinforcing wire or fibrous reinforcing material conforming to ASTM specifications
for such materials.
What are the reinforcing requirements for Tank Lids?- correct-answer - 3/8th Inch
steel reinforcing rods (rebar) spaced 12" on center each way extending a
minimum of 2.5" and a maximum of 3" from outside edge of tank lid.
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What load must a tank lid be able to withstand?- correct-answer - A uniform live
load of 150lbs per square foot in addition to all loads to which an underground
tank is normally subjected.
When would additional reinforcement be required for loads on concrete tanks?-
correct-answer - When subject to vehicular traffic or when top of tank is placed
more than 3 ft below finished grade.
What is the minimum thickness of poured in place septic tanks? Walls, Bottom,
and lids?- correct-answer - 4"
What are the minimum and maximum access opening tank lid sizes?- correct-
answer - Minimum 15", Maximum 24"
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What is the maximum depth below the ground surface access openings may be
located?- correct-answer - 12 Inches
When is a "Dosing" tank required?- correct-answer - For systems with 500 or
more linear feet of field line.
How is dosing accomplished?- correct-answer - By using pumps or siphons.
How many pumps or siphons are required for a system with greater than 500 ft
but less than 1000 linear feat of field lines?- correct-answer - 1
How many pumps or siphons are required for a system with more than 1000 ft of
field lines?- correct-answer - 2 - Must have alternating pumps or siphons with
alternating absorption fields.
Georgia Commercial Contractor
Septic Exam Study Guide| Certified
Q&A 2026
Minimum 28 day comprehensive strength of poured in place or pre-cast cement
tanks?- correct-answer - 4000 pounds per square inch.
What are the reinforcing requirements for the walls and base of a poured in place
septic tank?- correct-answer - Minimum 6" x 6" No. 10 gage welded steel
reinforcing wire or fibrous reinforcing material conforming to ASTM specifications
for such materials.
What are the reinforcing requirements for Tank Lids?- correct-answer - 3/8th Inch
steel reinforcing rods (rebar) spaced 12" on center each way extending a
minimum of 2.5" and a maximum of 3" from outside edge of tank lid.
,2|Page
What load must a tank lid be able to withstand?- correct-answer - A uniform live
load of 150lbs per square foot in addition to all loads to which an underground
tank is normally subjected.
When would additional reinforcement be required for loads on concrete tanks?-
correct-answer - When subject to vehicular traffic or when top of tank is placed
more than 3 ft below finished grade.
What is the minimum thickness of poured in place septic tanks? Walls, Bottom,
and lids?- correct-answer - 4"
What are the minimum and maximum access opening tank lid sizes?- correct-
answer - Minimum 15", Maximum 24"
, 3|Page
What is the maximum depth below the ground surface access openings may be
located?- correct-answer - 12 Inches
When is a "Dosing" tank required?- correct-answer - For systems with 500 or
more linear feet of field line.
How is dosing accomplished?- correct-answer - By using pumps or siphons.
How many pumps or siphons are required for a system with greater than 500 ft
but less than 1000 linear feat of field lines?- correct-answer - 1
How many pumps or siphons are required for a system with more than 1000 ft of
field lines?- correct-answer - 2 - Must have alternating pumps or siphons with
alternating absorption fields.
