CPWM Cheat Sheet 2026

The 30 highest-yield CPWM facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. A waste collection manager notices fuel costs increasing despite stable route miles. Which factor should be investigated first? → Idle time and engine warm-up habits of drivers
2. A waste-to-energy (WTE) facility that combusts 500 tons per day of MSW and generates electricity is classified under RCRA as: → A solid waste disposal facility subject to Subtitle D regulations
3. Under 40 CFR Part 264, what minimum liner system is required for new hazardous waste landfill units? → Double liner system with leachate collection between liners
4. Which OSHA standard specifically addresses confined space entry in general industry, requiring a permit system for permit-required confined spaces? → 29 CFR 1910.146
5. In single-stream recycling programs, which statement about contamination rates is most accurate compared to dual-stream programs? → Single-stream typically yields higher contamination rates but greater participation
6. What is the typical methane concentration range found in landfill gas collected from a well-managed MSW landfill? → 35–60% methane by volume
7. Which tool is most appropriate for comparing the environmental impacts of landfilling versus composting food waste? → Life cycle assessment (LCA)
8. A landfill is located within 10,000 feet of an airport used by turbojet aircraft. What operational restriction applies? → The landfill must demonstrate it will not increase bird hazards to aircraft
9. When calculating collection vehicle productivity, what does 'tons per truck per day' primarily measure? → Operational efficiency and throughput of the collection fleet
10. In an LFG collection system, what does a negative wellhead pressure (vacuum) measurement indicate? → The blower system is actively drawing gas from the waste mass toward the collection system
11. Which RCRA requirement mandates that TSDFs assess potential releases and implement corrective action for solid waste management units (SWMUs)? → Corrective Action (40 CFR Part 264 Subpart F)
12. A worker shows symptoms of heat stroke on a hot summer day at a landfill site. What is the IMMEDIATE priority action? → Call 911 and begin aggressive cooling of the worker immediately
13. Personal protective equipment (PPE) Level A provides the highest level of protection and is characterized by which combination? → SCBA and fully encapsulating vapor-protective suit
14. Which routing strategy is most effective at minimizing vehicle travel distance in a residential collection operation? → Serpentine or boustrophedon routing
15. What is the key advantage of RFID-tagged carts in a waste collection program? → They enable automated tracking of collection completion and set-out rates
16. What is the main advantage of in-vessel composting over windrow composting? → Better odor control and faster processing time
17. What is the primary regulatory concern with transporting liquid waste in an open-top roll-off container? → Risk of spillage violating 49 CFR bulk packaging and non-bulk packaging standards
18. What is the primary environmental concern with uncontrolled landfill gas migration? → Explosion hazard in confined spaces and greenhouse gas emissions
19. What is the primary regulatory purpose of a gas collection and control system (GCCS) at a municipal solid waste landfill? → To capture and control LFG emissions to meet Clean Air Act requirements
20. A recycling program achieves an 80% capture rate for aluminum cans. This means: → 80% of aluminum cans generated are collected for recycling
21. At the top of the EPA waste management hierarchy is: → Source reduction and reuse
22. A municipality considering adopting a Pay-As-You-Throw (PAYT) program expects which primary outcome related to recycling? → Increased diversion rates as residents have a financial incentive to recycle more
23. Under RCRA, which characteristic makes a solid waste a hazardous waste based on its ability to corrode metal containers? → Corrosivity
24. Which of the following is a primary goal of the EPA's Universal Waste Program? → To encourage the collection and recycling of certain common hazardous wastes
25. A facility subject to EPCRA Section 313 must file a Toxic Release Inventory (TRI) Form R if it manufactures or processes a listed chemical above what threshold? → 25,000 pounds for manufacturing/processing; 10,000 pounds for otherwise use
26. Which strategy most effectively reduces greenhouse gas emissions from the organic fraction of municipal solid waste? → Diverting organics to composting or anaerobic digestion
27. A generator produces 150 kg of hazardous waste in a calendar month. Which generator category does this facility fall under? → Very Small Quantity Generator (VSQG)
28. What is the primary limitation of using 'recycling rate' as the sole metric for SMM program success? → It ignores material quality, market conditions, and upstream source reduction efforts
29. Which parameter is used in the RCRA reactivity characteristic to identify potentially explosive sulfide-bearing wastes? → Generation of toxic gases when exposed to water or acid
30. What is the primary purpose of a leachate collection system in a sanitary landfill? → To capture liquid that percolates through waste and prevent groundwater contamination