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ILLINOIS PRIVATE SEWAGE CONTRACTOR EXAM WITH CORRECT ACTUAL QUESTIONS AND CORRECTLY WELL DEFINED ANSWERS LATEST 2025 ALREADY GRADED A+
Typology: Exams
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A single compartment tank needs to have a gas deflection baffle provided __________ the outlet of the baffle. - ANSWERS-Below
Access Manhole Requirements - ANSWERS-Above the Inlet of the Tank
Above the Outlet of the Tank
12" in Diameter
Less than 12" from surface
Maximum Capacity of Single Compartment Tank - ANSWERS-1350 Gallons Per Day
The volume of septic below the liquid level for flows less than 500 Gallons = - ANSWERS-750 Gallons
The volume of septic below the liquid level for flows greater than 500 Gallons =
1000 Gallons per day = 1,500 Gallons
The use of a private sewage disposal system to service more than one property is: - ANSWERS-Prohibited except when common property under joint ownership is provided or where the system is under public jurisdiction
Sewers are to be installed at least ______ feet horizontally from an existing or proposed water line. - ANSWERS-10 Feet Horizontally
If the distance between the sewer and water line must be less than 10 feet horizontally then the sewer line must be at least __________ inches below the invert of the water line. - ANSWERS-18"
Approved Pipe Materials - ANSWERS-Ductile Iron, Vitrified Clay, or Plastic at least 4" in diameter
Raw or improperly treated domestic sewage cannot be discharged into: - ANSWERS-Farm tiles
Streams
Sand Filter
Water Stabilization Pond
8 or 10 inch Gravelless Seepage System
Chamber System
Peat Filter System
Private Sewage Disposal System - ANSWERS-Any sewage handling or treatment facility receiving domestic
sewage from less than 15 people or population equivalent (less than 1, gallons} and having a ground
surface discharge or any sewage handling or treatment facility receiving domestic sewage and having
no ground surface discharge
Domestic Sewage - ANSWERS-Waste water derived principally from dwellings, business, or office buildings, institutions, food service establishments, and similar facilities
Clear Water Permitted to Drain in Septic System - ANSWERS-Cooling water
Groundwater
Discharge from roof drains
Discharge from footing tile
Condensate waste from refrigeration system
Condensate from steam heating system
Backwash from Water Softener
Prohibited Materials for Septic System - ANSWERS-Automotive Grease
Oil
Solvents
Chemicals
Privies, Chemical Toilets, Recirc Toilets, Incinerator Toilets, Compost Toilets
Holding Tanks
Illinois Raised Filter Bed Preceded By Batch Aeration System
If site conditions make it impractical to comply with the codes and regulations, what type of permit shall be required? - ANSWERS-Variance Permit
When installing a new or innovative type of sewage disposal system, what type of permit shall be required? - ANSWERS-Experimental Permit
A solids retention tank is required before a septic tank if: - ANSWERS-A garbage grinder is used
Maximum distance from the inlet wall to the inlet baffle - ANSWERS-12"
Maximum distance from the outlet wall to the outlet baffle - ANSWERS-6"
Distance from the top of the baffle to the bottom of the lid - ANSWERS-1" - 3"
Slip in baffles shall extend: - ANSWERS-The full width of the tank
Semi-Circular Baffles (V) shall have sides that fit tightly against: - ANSWERS-The tank wall
The vent for the baffle shall be equal in size to: - ANSWERS-The building sewer
Minimum Inlet Baffle Size Diameter - ANSWERS-6"
Minimum Outlet Baffle Size Diameter - ANSWERS-4"
When multiple tanks or compartments are used the first compartment shall be between ________ and ________ of the total capacity. - ANSWERS-Between 1/ and 2/3 of the Total Capacity
The wall separating the two compartments needs to be: - ANSWERS-Tight fitting
Extend to within 3" of the tank lid
Have a vent equal to the size of the building drain
The opening between compartments shall be: - ANSWERS-Centered on the Inlet and Outlet Openings
The depth to the invert of the opening between compartments shall be __________ percent of the liquid depth. - ANSWERS-40%
A gas deflection baffle shall be provided: - ANSWERS-Below the Outlet Baffle
Tanks are to be set level to +/- ______ inches in any direction and backfilled to prevent floating or drifting. - ANSWERS-1/2"
There are to be no connections within the area of __________. - ANSWERS-The over dig around the tank
If access openings are at or below the season high water table, they shall be _____________. - ANSWERS-Water-Tight
Abandoned Treatment Units shall be: - ANSWERS-Crumbled and filled with sand or soil
50 Feet Apart
Each soil boring shall extend at least ________ inches below the surface. - ANSWERS-At least 60" Below the Surface
One of the soil borings shall be located: - ANSWERS-At the lowest elevation of the subsurface seepage system
Domestic sewage or effluent from a private sewage disposal system cannot be discharged into a: - ANSWERS-Well
Cistern
Basement
Underground Mine
Cave
Sinkhole
Tunnel
The bottom of a subsurface field, each trench, and its distribution levels are to be: - ANSWERS-Level to +/- 1 inch
The amount of earth backfill over the bedding material, gravelless pipe or chamber system is between ______ and ______ inches. - ANSWERS-6" to 24"
There must be a minimum of _______ feet of undisturbed soil between the septic tank and the nearest trench. - ANSWERS-5 Feet
The top of the gravel, gravelless pipe or chamber system shall be ______ inches below the invert of the outlet of the septic tank or distribution box - ANSWERS- 1" Below the Invert of the Outlet
There should be a vertical separation distance of _______ feet between the bottom of the system and the top of the limiting layer. - ANSWERS-2 Feet
(3 Feet for Soils in Group I-VI)
Soil classification for determining the size of the system is based on which soil profile? - ANSWERS-The least permeable soil
Distribution lines need to be constructed of approved material and be perforated or open joint tile with joints place ______ to ______ inches apart. - ANSWERS-1/2" to 3/4" apart
Perforated tile needs have a minimum of 2 rows that are 1/2" to 3/4" openings spaced _____ to _____ inches on center and placed downards. - ANSWERS-3" to 5"
Bedding material needs to be clean gravel or stone with a particle size of _____ to ______ inches. - ANSWERS-3/4" to 4"
The sand filter needs to be dosed ______ times per day with equal flows which cannot exceed the design capacity. - ANSWERS-4 times
A buried sand filter needs to be designed for a minimum of ________ gallons/day. - ANSWERS-100 gallons per day
The sand filter media needs to be a minimum of ______ inches thick, and clear of clay and silt. - ANSWERS-24"
Collection lines need to have a slope of ________ inches per 100 feet with a collection line every _____ feet with caps on the top of the collection line. - ANSWERS-6" per 100 feet
10'
Illinois Raised Filter Beds are constructed using: - ANSWERS-Batch Aeration System and a Filter Bed
The aeration tank volume for a residential system is to be ______ times greater than the average daily wastewater flow in residential applications and ______ times greater in commercial applications. - ANSWERS-2x Residential
3x Commercial
The filter loading rate for residential systems is: - ANSWERS-4 Gallons per Square Foot per Day
Filter beds cannot exceed ________ square feet. - ANSWERS-600 Square Feet
Aerobic Treatment Plants need to be followed by which type of system? - ANSWERS-Subsurface Seepage System
Sand Filter
Waste Stabilization Pond
The depth of waste stabilization pond shall be between ________ and ______ feet. - ANSWERS-3' and 5'
A waste stabilization pond following a septic tank must allow for volume _____ times the average daily flow. - ANSWERS-60x
The bottom of a waste stabilization pond shall be constructed with what grade?
Class I Aerobic Treatment Plants rated at 500 Gallons per day are allowed for treatment of sewage from residential property up to _________ bedrooms. - ANSWERS-4 Bedrooms
Which types of treatment systems can discharge to a stream, river, lake, or pond? - ANSWERS-Buried Sand Filters
Waste Stabilization Ponds
Class I Aerobic Treatment Plant
Individual Mobile Home Sewage Flow Rate - ANSWERS-200 Gallons Per Day Per Bedroom
Campground Sewage Flow Rate - ANSWERS-150 Gallons Per Day Per Site
Commercial Sewage Flow Rate - ANSWERS-400 Gallons Per Day Per Toilet
Minimum Volume of Septic Tank in Residential Application - ANSWERS- Bedrooms = 750 Gallons
3 Bedrooms = 1000 Gallons
4 Bedrooms = 1250 Gallons
5 Bedrooms = 1500 Gallons
6 Bedrooms = 1750 Gallons
7 Bedrooms = 2000 Gallons
Gravelless System Construction Requirements - ANSWERS-Max Trench Length = 100 Feet
Minimum Trench Width = 18"
Maximum Trench Width = 24"
Minimum Trench Depth = 18"
Maximum Trench Depth = 24"
Trench Slope = Level
