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Illinois Private Sewage Contractor Exam
questions with answers
Private Sewage Disposal System - CORRECT 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 - CORRECT 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 - CORRECT 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 - CORRECT ANSWERS ✔✔Automotive Grease Oil Solvents Chemicals The use of a private sewage disposal system to service more than one property is: - CORRECT 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. - CORRECT 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. - CORRECT ANSWERS ✔✔18" Approved Pipe Materials - CORRECT ANSWERS ✔✔Ductile Iron, Vitrified Clay, or Plastic at least 4" in diameter Raw or improperly treated domestic sewage cannot be discharged into: - CORRECT ANSWERS ✔✔Farm tiles Streams Rivers Ponds
Peat Filter System 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? - CORRECT ANSWERS ✔✔Variance Permit When installing a new or innovative type of sewage disposal system, what type of permit shall be required? - CORRECT ANSWERS ✔✔Experimental Permit A solids retention tank is required before a septic tank if: - CORRECT ANSWERS ✔✔A garbage grinder is used The minimum liquid depth of septic tank is: - CORRECT ANSWERS ✔✔42" The maximum liquid depth of a septic tank is: - CORRECT ANSWERS ✔✔72"
Inlet & Outlet Openings Shall Be: - CORRECT ANSWERS ✔✔Cast-In Watertight The invert of the inlet needs to be at least how many inches above the liquid level? - CORRECT ANSWERS ✔✔2" How is the liquid level of the tank determined? - CORRECT ANSWERS ✔✔Equal to the Invert of the Outlet The inlet baffle extends ______ inches below the liquid level. - CORRECT ANSWERS ✔✔6" Below the Liquid Level The outlet baffle needs to extend to a depth equal to what percent of the liquid depth? - CORRECT ANSWERS ✔✔40% An outlet baffle for a tank with a liquid depth of 60" need to extend how many inches below the liquid depth? - CORRECT ANSWERS ✔✔24" 60" X 40% = 24" Maximum distance from the inlet wall to the inlet baffle - CORRECT ANSWERS ✔✔12"
12" in Diameter Less than 12" from surface Maximum Capacity of Single Compartment Tank - CORRECT ANSWERS ✔✔1350 Gallons Per Day The volume of septic below the liquid level for flows less than 500 Gallons = - CORRECT ANSWERS ✔✔750 Gallons The volume of septic below the liquid level for flows greater than 500 Gallons = - CORRECT ANSWERS ✔✔Daily Flow X 1. 1000 Gallons per day = 1,500 Gallons When multiple tanks or compartments are used the first compartment shall be between ________ and ________ of the total capacity. - CORRECT ANSWERS ✔✔Between 1/2 and 2/3 of the Total Capacity The wall separating the two compartments needs to be: - CORRECT 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: - CORRECT 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. - CORRECT ANSWERS ✔✔40% A gas deflection baffle shall be provided: - CORRECT ANSWERS ✔✔Below the Outlet Baffle Tanks are to be set level to +/- ______ inches in any direction and backfilled to prevent floating or drifting. - CORRECT ANSWERS ✔✔1/2" There are to be no connections within the area of __________. - CORRECT ANSWERS ✔✔The over dig around the tank If access openings are at or below the season high water table, they shall be _____________. - CORRECT ANSWERS ✔✔Water-Tight Abandoned Treatment Units shall be: - CORRECT ANSWERS ✔✔Crumbled and filled with sand or soil Septic tanks that are removed from the earth shall be replaced with: - CORRECT ANSWERS ✔✔Soil A distribution box can be installed: - CORRECT ANSWERS ✔✔Between a septic tank/aeration tank and a subsurface seepage system/buried sand filter
One of the soil borings shall be located: - CORRECT 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: - CORRECT ANSWERS ✔✔Well Cistern Basement Underground Mine Cave Sinkhole Tunnel The bottom of a subsurface field, each trench, and its distribution levels are to be: - CORRECT ANSWERS ✔✔Level to +/- 1 inch The amount of earth backfill over the bedding material, gravelless pipe or chamber system is between ______ and ______ inches. - CORRECT ANSWERS ✔✔6" to 24" There must be a minimum of _______ feet of undisturbed soil between the septic tank and the nearest trench. - CORRECT 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 - CORRECT 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. - CORRECT 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? - CORRECT 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. - CORRECT 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. - CORRECT ANSWERS ✔✔3" to 5" Bedding material needs to be clean gravel or stone with a particle size of _____ to ______ inches. - CORRECT ANSWERS ✔✔3/4" to 4" The bedding material extends the full width of the trench to a depth at least ______ inches below the line and _______ inches above the line. - CORRECT ANSWERS ✔✔6" below 2" above
A buried sand filter needs to be designed for a minimum of ________ gallons/day. - CORRECT ANSWERS ✔✔100 gallons per day The sand filter media needs to be a minimum of ______ inches thick, and clear of clay and silt. - CORRECT 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. - CORRECT ANSWERS ✔✔6" per 100 feet 10' Illinois Raised Filter Beds are constructed using: - CORRECT 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. - CORRECT ANSWERS ✔✔2x Residential 3x Commercial The filter loading rate for residential systems is: - CORRECT ANSWERS ✔✔4 Gallons per Square Foot per Day Filter beds cannot exceed ________ square feet. - CORRECT ANSWERS ✔✔600 Square Feet
Aerobic Treatment Plants need to be followed by which type of system? - CORRECT ANSWERS ✔✔Subsurface Seepage System Sand Filter Waste Stabilization Pond The depth of waste stabilization pond shall be between ________ and ______ feet. - CORRECT ANSWERS ✔✔3' and 5' A waste stabilization pond following a septic tank must allow for volume _____ times the average daily flow. - CORRECT ANSWERS ✔✔60x The bottom of a waste stabilization pond shall be constructed with what grade? - CORRECT ANSWERS ✔✔Level Class I Aerobic Treatment Plants rated at 500 Gallons per day are allowed for treatment of sewage from residential property up to _________ bedrooms. - CORRECT ANSWERS ✔✔4 Bedrooms Which types of treatment systems can discharge to a stream, river, lake, or pond? - CORRECT ANSWERS ✔✔Buried Sand Filters Waste Stabilization Ponds Class I Aerobic Treatment Plant Privies shall have a pit with a minimum capacity of ______ cubic feat per seat. - CORRECT ANSWERS ✔✔50 Cubic Feet per Seat
Individual Mobile Home Sewage Flow Rate - CORRECT ANSWERS ✔✔200 Gallons Per Day Per Bedroom Campground Sewage Flow Rate - CORRECT ANSWERS ✔✔150 Gallons Per Day Per Site Commercial Sewage Flow Rate - CORRECT ANSWERS ✔✔400 Gallons Per Day Per Toilet Minimum Volume of Septic Tank in Residential Application - CORRECT ANSWERS ✔✔2 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 - CORRECT 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
