CES Study Guide 2026
Everything you need to pass the CES exam in one place: the exam format, every topic to study, real practice questions with explanations, flashcards, and full-length practice tests. Free, no sign-up needed.
📋 CES Exam Format at a Glance
📚 CES Topics to Study (61)
✍️ Sample CES Questions & Answers
1. Under the Clean Water Act Section 404 program, which agency issues permits for discharge of dredged or fill material into waters of the United States?
The U.S. Army Corps of Engineers administers the Section 404 permit program for discharges of dredged or fill material into waters of the United States.
2. Which term describes the minimum concentration of a substance that can be reliably reported with a defined level of confidence using a specific analytical method, typically set at 5–10× the MDL?
The practical quantitation limit (PQL) is an operationally defined reporting threshold, typically 5–10 times the MDL, at which reliable quantitation with acceptable precision and accuracy is achievable.
3. Which waste management technique involves the high-temperature oxidation of hazardous organic wastes, achieving >99.99% destruction efficiency for certain compounds?
Incineration at high temperatures (>1200°C) achieves destruction and removal efficiencies (DRE) of at least 99.99% for principal organic hazardous constituents (POHCs).
4. Which law governs hazardous waste management in the U.S.?
The Resource Conservation and Recovery Act (RCRA) is the principal federal law in the U.S. governing the disposal of solid waste and hazardous waste. RCRA provides a comprehensive framework for managing hazardous waste from its generation to its final disposal ("cradle-to-grave"), including requirements for treatment, storage, and transportation. It also promotes resource recovery and waste minimization.
5. Which greenhouse gas has the highest global warming potential (GWP) over a 100-year timeframe among those regulated under the Kyoto Protocol?
Sulfur hexafluoride (SF6) has a GWP of approximately 23,500 over 100 years, making it the most potent of the six Kyoto Protocol greenhouse gases.
6. Which in-situ remediation technology is most appropriate for a LNAPL gasoline plume in a shallow unconfined aquifer?
Dual-phase extraction removes both vapor-phase VOCs from the vadose zone via SVE and liquid-phase LNAPL/dissolved-phase hydrocarbons via simultaneous groundwater extraction, making it highly effective for fuel hydrocarbons near the water table.