GEORGIA COMMERCIAL CONTRACTOR SEPTIC EXAM STUDY GUIDE 2026/2027 WITH
WELL DETAILED SOLUTIONS -GRADED A+
When a grease trap required?
Wherever grease in the effluent stream exceeds 50mg/L
What is the minimum size for a grease trap?
125 gallons
If a septic tank is converted into a grease trap where should the tees extend to?
Within 12 inches of the bottom, and must extend well above the water line on the top.
When should grease traps be cleaned?
When 75% of their grease retention capacity has been reached. Most be cleaned regularly
to prevent clogging. Typically once a week to every 2-3 months depending on usage.
When are ATU's required?
For any facility that produces a waste stream with with BOD and TSS higher than 200 mg/L.
Must reduce BOD and TSS to below 200 mg/L before application to the absorption field.
True or False, Any contractor installing an ATU must be must be authorized by the
manufacturer?
, True - The contractor must be able to show proof of the authorization.
True or False, ATU's must be approved by the department or by using a pretreatment unit
that has been approved by the Environmental Protection Division for that specific
application?
True - If approved by EPD correspondence must be provided. In either case the wastewater
flow volume and strength should be reviewed by a Registered Engineer as well as an
authorized representative of the product manufacturer. Written correspondence from the
designing engineer and product manufacturer is required.
What are the dosing amounts for conventional and chamber systems?
4 in distribution pipe (Conventiona., polystyrene, and bundled pipe) is 1/2 gallon per linear
foot.
Chamber systems dosing is 1 gallon per linear foot.
How are residential absorption fields sized?
According to peak daily sewage flow. 150 gallons per bedroom is used to estimate the
number of gallons per day of sewage flow.
When must a system be referred to the Georgia Environmental Protection Division for
permitting?
Any on-site sewage system greater than 10,000 gallons per day or any project on a single
property with a total daily flow of 10,000 gallons per day.
WELL DETAILED SOLUTIONS -GRADED A+
When a grease trap required?
Wherever grease in the effluent stream exceeds 50mg/L
What is the minimum size for a grease trap?
125 gallons
If a septic tank is converted into a grease trap where should the tees extend to?
Within 12 inches of the bottom, and must extend well above the water line on the top.
When should grease traps be cleaned?
When 75% of their grease retention capacity has been reached. Most be cleaned regularly
to prevent clogging. Typically once a week to every 2-3 months depending on usage.
When are ATU's required?
For any facility that produces a waste stream with with BOD and TSS higher than 200 mg/L.
Must reduce BOD and TSS to below 200 mg/L before application to the absorption field.
True or False, Any contractor installing an ATU must be must be authorized by the
manufacturer?
, True - The contractor must be able to show proof of the authorization.
True or False, ATU's must be approved by the department or by using a pretreatment unit
that has been approved by the Environmental Protection Division for that specific
application?
True - If approved by EPD correspondence must be provided. In either case the wastewater
flow volume and strength should be reviewed by a Registered Engineer as well as an
authorized representative of the product manufacturer. Written correspondence from the
designing engineer and product manufacturer is required.
What are the dosing amounts for conventional and chamber systems?
4 in distribution pipe (Conventiona., polystyrene, and bundled pipe) is 1/2 gallon per linear
foot.
Chamber systems dosing is 1 gallon per linear foot.
How are residential absorption fields sized?
According to peak daily sewage flow. 150 gallons per bedroom is used to estimate the
number of gallons per day of sewage flow.
When must a system be referred to the Georgia Environmental Protection Division for
permitting?
Any on-site sewage system greater than 10,000 gallons per day or any project on a single
property with a total daily flow of 10,000 gallons per day.
