Commercial Contractor EXAM
QUESTIONS AND ANSWERS
Commercial Contractors Certification - ANSWER>>is required to install any on-site
sewage management system with a design flow greater than 2000 gallons per day
Commercial tanks can be made of - ANSWER>>concrete, plastic, fiberglass, or
such other materials
Larger septic tanks - ANSWER>>may have to be constructed on-site
Septic tanks are sized for - ANSWER>>the daily 24 hour peak flow volume
Septic tanks may be - ANSWER>>trained together
The volume of the first compartment must be at least - ANSWER>>two-thirds the
volume of the 24 hour flow
The minimum size septic tank must be - ANSWER>>1000 gallons
Garbage grinders require the septic tank to be increased by - ANSWER>>fifty
percent (50%)
All tanks shall be equipped with tees that are - ANSWER>>four-inch (4") PVC,
ASTM 3034 rated or equivalent
Tees shall be located at the - ANSWER>>inlet and outlet ends of the tank
Tees shall be constructed so that they extend - ANSWER>>a minimum of 25% and
a maximum of 50% of the total liquid depth
, The invert of the outlet tee shall be located - ANSWER>>two inches (2") below the
invert of the inlet tee
Outlet tees shall be equipped with - ANSWER>>an effluent filter
The effluent filter on the outlet tee shall be designed to handle BOTH -
ANSWER>>the daily flow volume and wastewater characteristics
All tanks shall be constructed - ANSWER>>so the length is at least one and one
half (1 1/2) times the width
All tanks shall have - ANSWER>>two (2) compartments
Tank compartment partitions shall not be located no less than - ANSWER>>two-
thirds (2/3) or more than three-fourths (3/4) the length of the tank from the inlet
end
Compartment partitions will be constructed - ANSWER>>with a pass-thru hole or
slot
Pass-thru hole or slots shall be constructed so that it is - ANSWER>>equal to or
grater than the diameter of the inlet pipe and is positioned below the liquid
surface of a minimum of 25% to a maximum of 50% total liquid depth
Total liquid depth for larger poured-in-place tanks shall be a maximum of -
ANSWER>>sixty-six inches (66")
The walls and bottoms of poured-in-place septic tanks - ANSWER>>must be
reinforced
Septic tanks shall be reinforced by using - ANSWER>>six inch by six inch (6"x6")
No. 10 gage welded steel reinforcing wire,
or
QUESTIONS AND ANSWERS
Commercial Contractors Certification - ANSWER>>is required to install any on-site
sewage management system with a design flow greater than 2000 gallons per day
Commercial tanks can be made of - ANSWER>>concrete, plastic, fiberglass, or
such other materials
Larger septic tanks - ANSWER>>may have to be constructed on-site
Septic tanks are sized for - ANSWER>>the daily 24 hour peak flow volume
Septic tanks may be - ANSWER>>trained together
The volume of the first compartment must be at least - ANSWER>>two-thirds the
volume of the 24 hour flow
The minimum size septic tank must be - ANSWER>>1000 gallons
Garbage grinders require the septic tank to be increased by - ANSWER>>fifty
percent (50%)
All tanks shall be equipped with tees that are - ANSWER>>four-inch (4") PVC,
ASTM 3034 rated or equivalent
Tees shall be located at the - ANSWER>>inlet and outlet ends of the tank
Tees shall be constructed so that they extend - ANSWER>>a minimum of 25% and
a maximum of 50% of the total liquid depth
, The invert of the outlet tee shall be located - ANSWER>>two inches (2") below the
invert of the inlet tee
Outlet tees shall be equipped with - ANSWER>>an effluent filter
The effluent filter on the outlet tee shall be designed to handle BOTH -
ANSWER>>the daily flow volume and wastewater characteristics
All tanks shall be constructed - ANSWER>>so the length is at least one and one
half (1 1/2) times the width
All tanks shall have - ANSWER>>two (2) compartments
Tank compartment partitions shall not be located no less than - ANSWER>>two-
thirds (2/3) or more than three-fourths (3/4) the length of the tank from the inlet
end
Compartment partitions will be constructed - ANSWER>>with a pass-thru hole or
slot
Pass-thru hole or slots shall be constructed so that it is - ANSWER>>equal to or
grater than the diameter of the inlet pipe and is positioned below the liquid
surface of a minimum of 25% to a maximum of 50% total liquid depth
Total liquid depth for larger poured-in-place tanks shall be a maximum of -
ANSWER>>sixty-six inches (66")
The walls and bottoms of poured-in-place septic tanks - ANSWER>>must be
reinforced
Septic tanks shall be reinforced by using - ANSWER>>six inch by six inch (6"x6")
No. 10 gage welded steel reinforcing wire,
or
