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Question 1. Which Ohio Administrative Code (OAC) chapter specifically governs air emissions from stationary sources? A) OAC 3745- 1 - 03 B) OAC 3745- 2 - 01 C) OAC 3745- 5 - 01 D) OAC 3745- 7 - 01 Answer: C Explanation: OAC 3745- 5 - 01 contains the Ohio Air Pollution Control Rules that regulate emissions from stationary sources, including permit requirements and control technology standards. Question 2. Under the Clean Air Act, the National Ambient Air Quality Standards (NAAQS) are set for how many criteria pollutants? A) Four B) Six C) Eight D) Ten Answer: B Explanation: The CAA establishes NAAQS for six criteria pollutants: ozone, PM₂.₅, PM₁₀, carbon monoxide, sulfur dioxide, and nitrogen oxides. Question 3. Which of the following is a primary standard for ozone under the NAAQS? A) 70 ppb averaged over 8 hours B) 120 ppb averaged over 1 hour C) 75 ppb averaged over 24 hours D) 0.075 ppm averaged over 1 hour
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Answer: A Explanation: The EPA’s primary ozone standard is 70 ppb averaged over 8 hours to protect public health. Question 4. In Ohio, a NPDES permit is required for which type of discharge? A) Any discharge to a storm sewer B) Discharges to navigable waters or their tributaries C) Discharges to groundwater only D) Non-point agricultural runoff Answer: B Explanation: The National Pollutant Discharge Elimination System (NPDES) permits regulate point source discharges to waters of the United States, including navigable waters and tributaries. Question 5. Which Ohio Revised Code (ORC) section defines the “Cradle-to-Grave” responsibility for hazardous waste? A) ORC 3745. B) ORC 3745. C) ORC 3745. D) ORC 3745. Answer: C Explanation: ORC 3745.23 implements the federal RCRA “cradle-to-grave” tracking and management obligations for hazardous waste generators and handlers. Question 6. Which control technology is most effective for removing fine particulate matter (PM₂.₅) from flue gas? A) Cyclone separator
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A) Methane (CH₄) B) Benzene (C₆H₆) C) Carbon dioxide (CO₂) D) Water vapor (H₂O) Answer: B Explanation: Benzene is one of the 187 EPA-listed HAPs due to its carcinogenic properties. Question 10. In Ohio, the “Permit-to-Install” (PTI) is required for which type of activity? A) Constructing a new wastewater treatment plant B) Installing a new air emission control device on an existing source C) Operating a hazardous waste landfill D) Conducting a stormwater BMP inspection Answer: B Explanation: PTI authorizes the installation of a new or modified air emission source before construction begins. Question 11. Which of the following best describes the formation of ground-level ozone? A) Direct emission from diesel engines B) Photochemical reaction of NOₓ and VOCs in sunlight C) Oxidation of sulfur dioxide in the presence of water D) Thermal decomposition of nitrogen gas Answer: B Explanation: Ozone is a secondary pollutant formed when nitrogen oxides and volatile organic compounds react under sunlight.
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Question 12. The primary health effect of carbon monoxide (CO) exposure is: A) Respiratory irritation B) Reduced oxygen delivery to tissues C) Kidney damage D) Neurological seizures Answer: B Explanation: CO binds to hemoglobin with higher affinity than O₂, impairing oxygen transport and leading to hypoxia. Question 13. Which Ohio water quality standard parameter addresses eutrophication in Lake Erie? A) Total suspended solids (TSS) limit B) Nutrient (nitrogen and phosphorus) concentration limits C) pH range of 6.5-8. D) Dissolved oxygen minimum of 5 mg/L Answer: B Explanation: Ohio sets nutrient limits to curb algal blooms and eutrophication in Lake Erie. Question 14. A “Total Maximum Daily Load” (TMDL) is: A) The maximum amount of a pollutant a facility can emit per hour B) The calculated maximum amount of a pollutant that a waterbody can receive and still meet water quality standards C) The limit on hazardous waste shipped per day D) The permissible daily intake of lead for children Answer: B
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C. Manual stack test using an isokinetic probe D. Ambient air sampler at the facility perimeter Answer: B Explanation: CEMS provides continuous, automated measurement of NOₓ and other pollutants directly from the stack. Question 18. The primary purpose of a “Spill Prevention, Control, and Countermeasure” (SPCC) plan is to: A) Reduce greenhouse gas emissions from stationary sources B) Prevent oil discharges into navigable waters from storage facilities C) Ensure compliance with drinking water standards D. Manage hazardous waste incineration permits Answer: B Explanation: SPCC plans are required for facilities storing oil above certain thresholds to prevent accidental water contamination. Question 19. In Ohio, the “Voluntary Action Program” (VAP) is primarily used for: A) Accelerated permitting of new industrial facilities B) Voluntary cleanup of contaminated sites without litigation C. Granting exemptions from NPDES permits D. Funding stormwater BMP projects Answer: B Explanation: VAP encourages responsible parties to remediate contaminated sites voluntarily, often with reduced liability. Question 20. Which of the following is a common fate of lead (Pb) in the environment?
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A) Rapid volatilization into the atmosphere B. Biodegradation to harmless compounds C. Accumulation in soils and sediments D. Transformation into a gaseous oxide under sunlight Answer: C Explanation: Lead is a persistent heavy metal that tends to bind to soils and sediments, posing long-term exposure risks. Question 21. The Ohio EPA’s “Open Burning” rule primarily restricts burning of: A) Household waste in residential yards B. Agricultural residues only C. Any waste containing hazardous constituents D. Only municipal solid waste Answer: C Explanation: The rule prohibits open burning of waste that contains hazardous substances to protect air quality. Question 22. Which of the following is the most appropriate technology for removing hydrogen sulfide (H₂S) from a gas stream? A. Cyclone separator B. Wet scrubber with alkaline solution C. Fabric filter D. Electrostatic precipitator Answer: B Explanation: Wet scrubbers using alkaline solutions (e.g., sodium hydroxide) effectively absorb and neutralize H₂S.
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Explanation: Steel USTs are susceptible to corrosion and must have cathodic protection or equivalent measures per Ohio UST rules. Question 26. Which of the following best defines “Fugitive Dust” in the context of Ohio air regulations? A. Dust emitted from a stack under normal operating conditions B. Particulate matter released from open surfaces or material handling activities not captured by a stack C. Dust generated by vehicle exhaust D. Dust formed by chemical reactions in the atmosphere Answer: B Explanation: Fugitive dust refers to particulate emissions that escape from surfaces, stockpiles, or loading areas, and are not emitted through a confined point source. Question 27. The primary health effect associated with exposure to high concentrations of sulfur dioxide (SO₂) is: A. Neurological deficits B. Respiratory irritation and bronchoconstriction C. Liver damage D. Skin dermatitis Answer: B Explanation: SO₂ is a strong respiratory irritant that can cause bronchospasm, especially in asthmatic individuals. Question 28. Which of the following is a key component of a “Total Coliform” water quality test? A. Measurement of nitrate concentration B. Detection of Escherichia coli via membrane filtration
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C. Determination of turbidity using a nephelometer D. Assessment of pH using a calibrated probe Answer: B Explanation: Total coliform testing includes enumeration of E. coli as an indicator of fecal contamination. Question 29. In a “Batch reactor” used for chemical feed calculations, the dosage rate (mg/L) is calculated by which formula? A. (Flow rate × Concentration) / Volume B. (Mass of chemical × 1000) / (Flow rate × Time) C. (Desired concentration × Flow rate) / (Chemical concentration) D. (Volume × Time) / Flow rate Answer: C Explanation: To achieve a target concentration, the required mass of chemical equals desired concentration times flow, divided by the chemical’s stock concentration. Question 30. Which of the following is a characteristic of “hazardous waste” under RCRA? A. Non-hazardous municipal solid waste B. Waste that ignites readily, is corrosive, reactive, or toxic C. Recyclable glass and metal D. Agricultural residues Answer: B Explanation: RCRA defines hazardous waste based on ignitability, corrosivity, reactivity, and toxicity criteria.
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Answer: B Explanation: Ohio follows the federal definition: a major source emits ≥10 tons per year of a single pollutant or ≥25 tons per year of a combination. Question 34. Which of the following is a typical requirement for a Title V operating permit? A. Quarterly emission inventory reporting B. Annual stormwater discharge certification only C. No recordkeeping obligations D. Mandatory installation of solar panels Answer: A Explanation: Title V permits require comprehensive recordkeeping, including quarterly emission inventories and compliance reports. Question 35. Which of the following best describes “bioavailability” of a contaminant in soil? A. The total mass of contaminant present B. The fraction that can be taken up by organisms or leached into water C. The concentration measured by X-ray fluorescence D. The rate at which the contaminant evaporates Answer: B Explanation: Bioavailability refers to the portion of a contaminant that is accessible for biological uptake or transport. Question 36. Which EPA method is commonly used for measuring volatile organic compounds (VOCs) in ambient air? A. EPA Method 1603 – GC-FID B. EPA Method 300 – Atomic Absorption
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C. EPA Method 200.8 – ICP-MS D. EPA Method 110.1 – Turbidity Answer: A Explanation: Method 1603 uses gas chromatography with flame ionization detection (GC-FID) for VOC analysis. Question 37. What is the primary purpose of “pH adjustment” in drinking water treatment? A. To increase microbial growth B. To reduce corrosion of distribution pipes and improve disinfectant efficacy C. To enhance taste only D. To precipitate suspended solids directly Answer: B Explanation: Proper pH minimizes pipe corrosion, reduces lead leaching, and optimizes disinfection processes. Question 38. Which of the following is a typical BMP (Best Management Practice) for reducing agricultural nutrient runoff? A. Installing a larger storage tank for pesticides B. Constructing vegetated buffer strips along waterways C. Increasing irrigation frequency D. Applying fertilizer during the hottest part of the day Answer: B Explanation: Buffer strips intercept runoff, allowing nutrients to be absorbed or filtered before reaching water bodies. Question 39. In a wastewater treatment plant, “Tertiary treatment” most often includes which process?
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Question 42. Which of the following is a common indicator of groundwater contamination by petroleum hydrocarbons? A. Elevated chloride levels B. Presence of benzene, toluene, ethylbenzene, and xylene (BTEX) C. Increased hardness (Ca²⁺, Mg²⁺) D. High sulfate concentrations Answer: B Explanation: BTEX compounds are characteristic markers of petroleum contamination in groundwater. Question 43. In the context of hazardous waste landfills, “leachate” is best defined as: A. The gas produced by anaerobic decomposition B. Liquid that percolates through waste, potentially carrying contaminants C. The compacted waste material itself D. The cover soil placed on top of the landfill Answer: B Explanation: Leachate is the contaminated liquid that drains from a landfill and must be collected and treated. Question 44. Which of the following devices measures particulate matter on a continuous basis using beta attenuation? A. Optical particle counter B. Beta attenuation monitor (BAM) C. Gravimetric filter sampler D. Quartz crystal microbalance Answer: B
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Explanation: BAM instruments use beta radiation attenuation to provide real-time PM concentration data. Question 45. The “National Pollutant Discharge Elimination System” (NPDES) permit for a municipal stormwater system is required under which federal act? A. Clean Air Act B. Safe Drinking Water Act C. Clean Water Act D. Resource Conservation and Recovery Act Answer: C Explanation: NPDES permits, including those for stormwater, are issued under the authority of the Clean Water Act. Question 46. Which of the following is an example of a “hazardous waste generator” classified as a Large Quantity Generator (LQG) in Ohio? A. Facility that generates 10 kg per month of hazardous waste B. Facility that generates 1,000 kg per month of hazardous waste C. Household that disposes of a single paint can D. Small research lab producing 5 kg per year Answer: B Explanation: LQGs generate ≥1,000 kg (≈2,200 lb) of hazardous waste per month, triggering more stringent RCRA requirements. Question 47. Which of the following is a typical method for in-situ remediation of chlorinated solvent-contaminated groundwater? A. Soil vapor extraction B. Pump-and-treat with air stripping only
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Question 50. In Ohio, the “Stormwater Management” rule for MS4s requires municipalities to develop which of the following? A. A permit-free wastewater discharge plan B. A Stormwater Pollution Prevention Plan (SWPPP) that includes BMPs and monitoring C. A requirement to eliminate all stormwater runoff D. A mandatory groundwater recharge program Answer: B Explanation: MS4s must adopt a SWPPP outlining BMPs, monitoring, and public outreach to reduce stormwater pollution. Question 51. Which of the following is the primary purpose of a “wet scrubber” in air pollution control? A. To capture particulate matter via inertial impaction B. To dissolve and neutralize acidic gases in a liquid absorbent C. To oxidize nitrogen oxides using a catalyst D. To combust volatile organic compounds at high temperature Answer: B Explanation: Wet scrubbers use a liquid (often alkaline) to absorb and neutralize acidic gases such as SO₂ and HCl. Question 52. The “EPA Method 525.2” is used for analyzing which type of contaminant in water? A. Total suspended solids B. Volatile organic compounds (VOCs) by purge-and-trap GC-MS C. Heavy metals by ICP-MS D. Nutrients by colorimetry Answer: B
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Explanation: Method 525.2 specifies purge-and-trap gas chromatography-mass spectrometry for VOCs in drinking water. Question 53. Which of the following is a key indicator of successful operation of a biological nutrient removal (BNR) process? A. High residual chlorine levels B. Low mixed liquor suspended solids (MLSS) concentration C. Nitrate concentration below 5 mg N/L in effluent D. Elevated ammonia levels in final effluent Answer: C Explanation: Effective BNR reduces nitrate (and often total nitrogen) to low levels, indicating successful denitrification. Question 54. In the context of occupational safety, which PPE is mandatory when handling liquid mercury in a laboratory? A. Ear plugs B. Respirator with organic vapor cartridge, nitrile gloves, and splash goggles C. Steel-toed boots only D. None, mercury is non-hazardous Answer: B Explanation: Mercury vapors are toxic; appropriate respiratory protection, chemical-resistant gloves, and eye protection are required. Question 55. Which of the following best describes “isokinetic sampling” for stack emissions? A. Sampling at a flow rate equal to the stack gas velocity to avoid bias B. Sampling at a constant temperature regardless of stack conditions C. Sampling only during low-flow periods
