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Illinois Private Sewage Contractor
Exam with correct answers
Private Sewage Disposal System - correct answer✔✔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 answer✔✔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 answer✔✔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 answer✔✔Automotive Grease Oil Solvents
Chemicals The use of a private sewage disposal system to service more than one property is: - correct answer✔✔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 answer✔✔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 answer✔✔18" Approved Pipe Materials - correct answer✔✔Ductile Iron, Vitrified Clay, or Plastic at least 4" in diameter Raw or improperly treated domestic sewage cannot be discharged into: - correct answer✔✔Farm tiles Streams Rivers Ponds Lakes Other collectors of water. Septic Tanks cannot be located: - correct answer✔✔Where surface water will accumulate or near: Driveways Accessory building
When installing a new or innovative type of sewage disposal system, what type of permit shall be required? - correct answer✔✔Experimental Permit A solids retention tank is required before a septic tank if: - correct answer✔✔A garbage grinder is used The minimum liquid depth of septic tank is: - correct answer✔✔42" The maximum liquid depth of a septic tank is: - correct answer✔✔72" Inlet & Outlet Openings Shall Be: - correct answer✔✔Cast-In Watertight The invert of the inlet needs to be at least how many inches above the liquid level? - correct answer✔✔2" How is the liquid level of the tank determined? - correct answer✔✔Equal to the Invert of the Outlet The inlet baffle extends ______ inches below the liquid level. - correct answer✔✔6" Below the Liquid Level The outlet baffle needs to extend to a depth equal to what percent of the liquid depth? - correct answer✔✔40% An outlet baffle for a tank with a liquid depth of 60" need to extend how many inches below the liquid depth? - correct answer✔✔24" 60" X 40% = 24"
Maximum distance from the inlet wall to the inlet baffle - correct answer✔✔12" Maximum distance from the outlet wall to the outlet baffle - correct answer✔✔6" Distance from the top of the baffle to the bottom of the lid - correct answer✔✔1" - 3" Slip in baffles shall extend: - correct answer✔✔The full width of the tank Semi-Circular Baffles (V) shall have sides that fit tightly against: - correct answer✔✔The tank wall The vent for the baffle shall be equal in size to: - correct answer✔✔The building sewer Minimum Inlet Baffle Size Diameter - correct answer✔✔6" Minimum Outlet Baffle Size Diameter - correct answer✔✔4" A single compartment tank needs to have a gas deflection baffle provided __________ the outlet of the baffle. - correct answer✔✔Below Access Manhole Requirements - correct answer✔✔Above the Inlet of the Tank Above the Outlet of the Tank 12" in Diameter
Tanks are to be set level to +/- ______ inches in any direction and backfilled to prevent floating or drifting. - correct answer✔✔1/2" There are to be no connections within the area of __________. - correct answer✔✔The over dig around the tank If access openings are at or below the season high water table, they shall be _____________. - correct answer✔✔Water-Tight Abandoned Treatment Units shall be: - correct answer✔✔Crumbled and filled with sand or soil Septic tanks that are removed from the earth shall be replaced with: - correct answer✔✔Soil A distribution box can be installed: - correct answer✔✔Between a septic tank/aeration tank and a subsurface seepage system/buried sand filter The distribution box needs to provide for: - correct answer✔✔Equal distribution of flow to the subsurface system The distribution box shall be constructed of: - correct answer✔✔Watertight, Non-Corrosive Material Subsurface seepage systems shall be designed based on: - correct answer✔✔The absorption capacity of the soil Who is qualified to conduct a soil investigation? - correct answer✔✔Soil Classifier
Licensed Professional Engineer Local Health Department Employee (3 Years Approving Systems with 6 Hours of Soils Coursework) Local Health Department Employee (5 Years Direct Supervision) A minimum of ______ soil borings at least ______ feet apart are to be located within the area of the proposed subsurface seepage system. - correct answer✔✔3 Soil Borings 50 Feet Apart Each soil boring shall extend at least ________ inches below the surface. - correct answer✔✔At least 60" Below the Surface One of the soil borings shall be located: - correct answer✔✔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 answer✔✔Well Cistern Basement Underground Mine Cave Sinkhole Tunnel The bottom of a subsurface field, each trench, and its distribution levels are to be: - correct answer✔✔Level to +/- 1 inch
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 answer✔✔6" below 2" above The ends of the trenches are to be looped except when using a: - correct answer✔✔Serial Distribution System Approved corrugated polyethylene tubing must be _____ inches or _____ inches in diameter. - correct answer✔✔8" or 10" On a serial distribution system, there needs to be a minimum of _______ feet of undisturbed earth between the septic tank and the first trench and ______ feet between each trench. - correct answer✔✔5" Feet from the Septic 6" from the next trench The total bottom area for a seepage bed is ________ times the area determined for a gravel seepage field system. - correct answer✔✔1.5x the area Buried sand filters need to have _________ square feet per bed room when on a septic system which is cut by ________ on aerobic system. - correct answer✔✔200 Square Feet 1/ The sand filter needs to be dosed ______ times per day with equal flows which cannot exceed the design capacity. - correct answer✔✔4 times A buried sand filter needs to be designed for a minimum of ________ gallons/day. - correct answer✔✔100 gallons per day
The sand filter media needs to be a minimum of ______ inches thick, and clear of clay and silt. - correct answer✔✔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 answer✔✔6" per 100 feet 10' Illinois Raised Filter Beds are constructed using: - correct answer✔✔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 answer✔✔2x Residential 3x Commercial The filter loading rate for residential systems is: - correct answer✔✔ 4 Gallons per Square Foot per Day Filter beds cannot exceed ________ square feet. - correct answer✔✔ 600 Square Feet Aerobic Treatment Plants need to be followed by which type of system? - correct answer✔✔Subsurface Seepage System Sand Filter Waste Stabilization Pond The depth of waste stabilization pond shall be between ________ and ______ feet. - correct answer✔✔3' and 5'
A sanitary dump station with no disposal system is to be designed for _____ gallons per day for each RV site. - correct answer✔✔140 Gallons per day per site Swimming pool waste may not be discharged into a private sewage disposal system if: - correct answer✔✔The system contains domestic sewage Single Family Dwelling Sewage Flow Rate - correct answer✔✔200 Gallons Per Day Per Bedroom Multi Family Dwelling Sewage Flow Rate - correct answer✔✔200 Gallons Per Day Per Bedroom Individual Mobile Home Sewage Flow Rate - correct answer✔✔200 Gallons Per Day Per Bedroom Campground Sewage Flow Rate - correct answer✔✔150 Gallons Per Day Per Site Commercial Sewage Flow Rate - correct answer✔✔400 Gallons Per Day Per Toilet Minimum Volume of Septic Tank in Residential Application - correct answer✔✔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 answer✔✔Max Trench Length = 100 Feet Minimum Trench Width = 18" Maximum Trench Width = 24" Minimum Trench Depth = 18" Maximum Trench Depth = 24" Trench Slope = Level
