Land, Soil and Solid Waste
5 minutes
5 Questions
In the Associate Safety Professional (ASP) body of knowledge, Land, Soil, and Solid Waste management falls under Environmental Management and addresses how workplace activities affect terrestrial resources and how regulatory programs control waste streams. Land and soil are finite environmental media that can be degraded by erosion, compaction, contamination from spills, leaching from improperly stored materials, and improper disposal practices. Soil contamination is especially significant because pollutants such as petroleum hydrocarbons, heavy metals, solvents, and pesticides can persist, migrate to groundwater, and expose workers and communities through dermal contact, inhalation of dust or vapors, and ingestion. Solid waste management is governed primarily by the Resource Conservation and Recovery Act (RCRA) in the United States. Subtitle D regulates non-hazardous solid waste, including municipal and industrial waste, landfill design, liners, leachate collection, and groundwater monitoring. Subtitle C establishes cradle-to-grave management of hazardous waste, requiring generators to identify waste by listing or by characteristics—ignitability, corrosivity, reactivity, and toxicity—to classify their generator status, use manifests for transport, and comply with storage time limits, labeling, container management, and training requirements. The Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA, or Superfund) addresses remediation of contaminated sites and assigns liability to potentially responsible parties. Safety professionals apply the waste management hierarchy: source reduction, reuse, recycling, treatment, and finally disposal. Effective programs include waste characterization, segregation, secondary containment, spill prevention plans, proper labeling, and recordkeeping. Soil remediation techniques include excavation and removal, bioremediation, soil vapor extraction, and capping. Erosion and sediment control measures such as silt fences, vegetative cover, and stormwater management protect land during construction. For the ASP exam, candidates should understand regulatory definitions, generator categories, waste characteristics, landfill controls, pollution prevention strategies, and the safety professional's role in integrating environmental compliance with occupational health protection to prevent exposure, liability, and environmental harm.
Land, Soil and Solid Waste: A Complete Study Guide for the BCSP ASP Exam (Environmental Management Domain)
Introduction
Land, Soil and Solid Waste is a core topic within the Environmental Management domain of the BCSP Associate Safety Professional (ASP) examination. While many candidates come from a safety background and feel comfortable with hazard recognition and control, environmental topics often feel like foreign territory. The good news is that this subject area is highly structured, rule-based, and predictable once you understand the underlying framework. This guide explains why the topic matters, what it covers, how the regulatory and technical systems work, and exactly how to approach exam questions so you can earn these points with confidence.
Why Land, Soil and Solid Waste Is Important
Safety professionals are increasingly expected to function as EHS (Environment, Health and Safety) generalists. Many organizations assign environmental compliance duties to the safety department, which means an ASP must understand how improperly managed waste and contaminated land create legal liability, financial exposure, and direct hazards to workers and communities.
There are several reasons BCSP tests this material:
1. Worker exposure: Workers who handle waste drums, excavate contaminated soil, or operate landfill equipment face chemical, biological, and physical hazards. Understanding waste characteristics helps you anticipate exposures.
2. Regulatory liability: Under the Resource Conservation and Recovery Act (RCRA), waste generators are responsible for their waste from cradle to grave. Under CERCLA (Superfund), liability is strict, joint and several, and retroactive. A single mistake can cost an employer millions.
3. Emergency response: Spills, releases, and abandoned waste sites trigger HAZWOPER (29 CFR 1910.120) requirements, which connect directly to safety practice.
4. Sustainability and reputation: Modern safety management systems (ISO 45001, ISO 14001) integrate environmental stewardship with occupational safety.
5. Exam weighting: Environmental Management is one of the scored domains on the ASP blueprint, and waste management is among its most testable content because it contains specific numbers, definitions, and classifications that lend themselves to multiple-choice questions.
What It Is: Key Definitions and Concepts
Solid Waste
Under RCRA, the term solid waste is broader than it sounds. It includes any garbage, refuse, sludge, or other discarded material, whether it is solid, liquid, semi-solid, or contained gaseous material. A drum of spent solvent is a solid waste under RCRA even though it is a liquid. Solid waste is divided into non-hazardous waste (regulated under RCRA Subtitle D) and hazardous waste (regulated under RCRA Subtitle C).
Hazardous Waste
A solid waste becomes a hazardous waste in one of two ways:
1. Listed wastes appear on EPA lists in 40 CFR 261:
- F-list: wastes from non-specific sources (for example, spent halogenated solvents such as F001 and F002).
- K-list: wastes from specific industrial sources (for example, petroleum refining or wood preserving).
- P-list: acutely hazardous discarded commercial chemical products (highly toxic, very small quantity thresholds).
- U-list: toxic discarded commercial chemical products that are not acutely hazardous.
2. Characteristic wastes exhibit one or more of four properties:
- Ignitability (D001): liquids with a flash point below 60 degrees C (140 degrees F), ignitable compressed gases, oxidizers, or non-liquids that can cause fire through friction or spontaneous chemical change.
- Corrosivity (D002): aqueous wastes with pH less than or equal to 2 or greater than or equal to 12.5, or liquids that corrode steel at a rate greater than 6.35 mm (0.25 inch) per year.
- Reactivity (D003): unstable, reacts violently with water, generates toxic gases, or is capable of detonation.
- Toxicity (D004 through D043): determined by the Toxicity Characteristic Leaching Procedure (TCLP), which simulates leaching in a landfill. Contaminants include heavy metals (arsenic, barium, cadmium, chromium, lead, mercury, selenium, silver), pesticides, and organic compounds.
Remember the acronym ICRT (Ignitable, Corrosive, Reactive, Toxic) for the four characteristics.
Generator Categories
Generator status is based on the quantity of hazardous waste generated per calendar month:
- Very Small Quantity Generator (VSQG): 100 kg or less per month of hazardous waste and 1 kg or less of acutely hazardous waste. (Formerly called Conditionally Exempt Small Quantity Generator.)
- Small Quantity Generator (SQG): more than 100 kg but less than 1,000 kg per month. May accumulate on site up to 180 days (270 days if the TSD facility is more than 200 miles away), with a maximum of 6,000 kg on site at any time.
- Large Quantity Generator (LQG): 1,000 kg or more per month, or more than 1 kg of acutely hazardous waste. May accumulate on site up to 90 days with no quantity limit, but must have a written contingency plan, formal training, and emergency coordinator.
Useful conversion: 1,000 kg is approximately 2,200 pounds, which is roughly five 55-gallon drums of typical liquid waste. 100 kg is approximately 220 pounds, or about half a drum.
Satellite Accumulation Areas (SAA)
Generators may accumulate up to 55 gallons of hazardous waste (or 1 quart of liquid acute hazardous waste, or 1 kg of solid acute hazardous waste) at or near the point of generation under the control of the operator. Containers must be closed, labeled with the words Hazardous Waste, and marked with the hazards. Once the limit is reached, the container must be moved to the central accumulation area within 3 days.
Cradle-to-Grave and the Manifest System
RCRA tracks hazardous waste from the point of generation through transportation to its final treatment, storage, or disposal. The Uniform Hazardous Waste Manifest (EPA Form 8700-22) accompanies every off-site shipment. Generators must obtain an EPA Identification Number, use licensed transporters, and send waste only to permitted Treatment, Storage and Disposal Facilities (TSDFs). The e-Manifest system now allows electronic tracking. If a signed copy is not returned within 35 days (LQG), the generator must investigate; an Exception Report is required at 45 days.
Land Disposal Restrictions (LDR)
Also called the land ban, the LDR program prohibits land disposal of hazardous waste unless it has been treated to meet specific treatment standards. This prevents untreated hazardous waste from simply being buried.
Universal Waste
A streamlined set of rules covers widely generated hazardous wastes to encourage recycling: batteries, pesticides, mercury-containing equipment (thermostats), lamps (fluorescent bulbs), and aerosol cans. Universal waste may be accumulated for up to one year.
Used Oil
Used oil is managed under its own standards (40 CFR 279) and is not automatically a hazardous waste if it is recycled. Containers must be labeled Used Oil, not Waste Oil.
Non-Hazardous Solid Waste and Landfills (Subtitle D)
Municipal solid waste landfills must meet design criteria including composite liners (a flexible membrane liner over compacted clay), leachate collection systems, groundwater monitoring, methane gas monitoring and control, daily cover, and financial assurance for closure and post-closure care (typically 30 years). Leachate is the liquid that percolates through waste and picks up contaminants. Landfill gas is roughly half methane and half carbon dioxide; methane is explosive between 5 and 15 percent in air, which is why monitoring at the property boundary and in structures is required.
Other Disposal and Treatment Methods
- Incineration: destroys organics, reduces volume by up to 90 percent, requires air emission controls, produces ash that may itself be hazardous.
- Composting: aerobic biological decomposition of organic waste.
- Stabilization and solidification: binding contaminants (especially metals) in cement or similar matrix to reduce leaching.
- Deep well injection: regulated under the Safe Drinking Water Act Underground Injection Control program.
- Recycling and recovery: preferred over disposal.
The Waste Management Hierarchy
From most preferred to least preferred: Source Reduction (Prevention) - Reuse - Recycling - Energy Recovery - Treatment - Disposal. The Pollution Prevention Act of 1990 established source reduction as national policy. Think of this as the environmental equivalent of the hierarchy of controls: eliminating the waste at the source is always the best answer.
Land and Soil Contamination
CERCLA (Superfund), the Comprehensive Environmental Response, Compensation and Liability Act of 1980, addresses abandoned or uncontrolled hazardous waste sites. Key features:
- The National Priorities List (NPL) ranks the most contaminated sites using the Hazard Ranking System.
- Potentially Responsible Parties (PRPs) include current owners, past owners at the time of disposal, generators, and transporters.
- Liability is strict (no need to prove negligence), joint and several (any one party can be held liable for the entire cost), and retroactive.
- Removal actions are short-term emergency responses; remedial actions are long-term cleanups.
- The Reportable Quantity (RQ) is the amount of a hazardous substance that, if released, must be reported to the National Response Center.
- SARA Title III (EPCRA) added community right-to-know, Tier II reporting, and the Toxics Release Inventory.
Brownfields are previously developed properties where redevelopment is complicated by actual or perceived contamination. The Brownfields program provides liability relief and funding to encourage reuse.
Soil Properties Relevant to Contamination
- Permeability: how easily fluids move through soil. Clay has low permeability (good liner material); sand and gravel have high permeability (contaminants migrate quickly).
- Porosity: the void space in soil.
- pH and cation exchange capacity: affect how metals bind to soil.
- Vadose zone: the unsaturated soil above the water table; the saturated zone below holds groundwater.
- Plume: the body of contaminated groundwater moving down-gradient from a source.
- NAPLs: Non-Aqueous Phase Liquids. LNAPLs (such as gasoline) float on groundwater; DNAPLs (such as chlorinated solvents) sink.
Soil and Groundwater Remediation Technologies
- Excavation and off-site disposal: fast, simple, but expensive and shifts the problem.
- Soil vapor extraction (SVE): vacuum removes volatile organics from the vadose zone.
- Bioremediation: microorganisms degrade contaminants; can be in situ or ex situ (landfarming, biopiles).
- Phytoremediation: plants take up or stabilize contaminants.
- Pump and treat: groundwater extraction with surface treatment.
- Air sparging: injecting air below the water table to volatilize contaminants.
- Capping: covering contamination to prevent exposure and infiltration (containment, not destruction).
- Thermal desorption: heating soil to volatilize contaminants.
- In situ chemical oxidation: injecting oxidants such as permanganate or peroxide.
Soil Erosion and Sediment Control
Construction sites disturbing one acre or more must obtain NPDES stormwater permit coverage under the Clean Water Act and prepare a Stormwater Pollution Prevention Plan (SWPPP). Best management practices include silt fences, sediment basins, straw wattles, stabilized construction entrances, erosion control blankets, and phased grading to minimize exposed soil.
Spill Prevention and Response
The SPCC rule (Spill Prevention, Control and Countermeasure, 40 CFR 112) applies to facilities with aggregate aboveground oil storage over 1,320 gallons (or underground storage over 42,000 gallons) that could reasonably discharge to navigable waters. Requirements include secondary containment (typically 110 percent of the largest tank), inspections, training, and a written plan. Underground Storage Tanks (USTs) are regulated under RCRA Subtitle I with leak detection, corrosion protection, and spill and overfill prevention.
Related Waste Streams
- Asbestos: regulated under NESHAP (Clean Air Act) for demolition and renovation; disposal requires wetting, sealed labeled containers, and approved landfills.
- PCBs: regulated under TSCA (Toxic Substances Control Act), not RCRA; concentrations of 50 ppm or greater trigger requirements.
- Medical waste: primarily state regulated; OSHA Bloodborne Pathogens Standard governs worker protection.
- Radioactive waste: regulated by the NRC and DOE; low-level versus high-level waste.
- Electronic waste: often managed as universal waste under state programs; contains lead, mercury, and cadmium.
How It Works: The Waste Management Process Step by Step
1. Waste determination: At the point of generation, the generator must determine whether the material is a solid waste and, if so, whether it is hazardous (listed or characteristic). This is done using process knowledge or laboratory testing such as TCLP.
2. Classification and coding: Assign EPA waste codes (D, F, K, P, U) and DOT shipping description.
3. Accumulation: Store in compatible, closed, labeled containers in satellite or central accumulation areas with weekly inspections, secondary containment where required, and adequate aisle space.
4. Time and quantity tracking: Mark accumulation start dates and observe 90, 180, or 270 day limits based on generator status.
5. Preparation for shipment: Complete the manifest, apply DOT labels and placards, and use a licensed hazardous waste transporter.
6. Transport and disposal: Waste goes to a permitted TSDF; treatment must meet LDR standards before land disposal.
7. Recordkeeping and reporting: Retain manifests for 3 years, submit Biennial Reports (LQGs), maintain training records, and file contingency plans.
8. Contingency planning: LQGs need a written plan, an emergency coordinator, communication systems, and coordination with local responders.
9. Closure: When operations cease, accumulation areas and TSDFs must be decontaminated and closed according to approved plans.
For contaminated land, the process under CERCLA follows: Preliminary Assessment - Site Inspection - Hazard Ranking - NPL Listing - Remedial Investigation and Feasibility Study (RI/FS) - Record of Decision (ROD) - Remedial Design and Remedial Action - Operation and Maintenance - Deletion from the NPL.
How to Answer Exam Questions on Land, Soil and Solid Waste
ASP questions in this area tend to fall into five categories:
1. Definition and classification questions
Example style: A waste with a flash point of 120 degrees F would be classified as which characteristic hazardous waste? Answer: Ignitable (D001), because it is below 140 degrees F. Approach: memorize the four characteristics with their numeric thresholds and the four list letters with what they represent.
2. Threshold and quantity questions
Example style: A facility generates 800 kg of hazardous waste per month. What is its generator status and maximum accumulation time? Answer: Small Quantity Generator, 180 days (270 if TSDF is over 200 miles away). Approach: build a mental table of 100 kg, 1,000 kg, 1 kg acute, 90/180/270 days, 55 gallons, 1 quart, 3 days, 35/45 days, 1,320 gallons, 50 ppm PCBs, pH 2 and 12.5, 60 degrees C.
3. Regulatory jurisdiction questions
Example style: Which law governs cleanup of abandoned hazardous waste sites? Answer: CERCLA. Approach: match the law to its purpose: RCRA = active waste management cradle to grave; CERCLA = abandoned sites and cleanup liability; TSCA = PCBs and chemical substances; Clean Water Act = stormwater, SPCC, NPDES; Clean Air Act = asbestos NESHAP and landfill gas; SDWA = underground injection.
4. Hierarchy and best-practice questions
Example style: What is the most preferred method of managing waste? Answer: Source reduction. Approach: when a question asks for the most preferred, best, or first option, move up the hierarchy. When asked for least preferred, move down to disposal.
5. Scenario and application questions
Example style: During excavation, workers encounter stained soil with a solvent odor. What should be done first? Answer: Stop work, evacuate, and assess (treat as an unknown hazard). Approach: apply the safety professional mindset: protect people first, then contain, then characterize, then report, then remediate.
Exam Tips: Answering Questions on Land, Soil and Solid Waste
Tip 1: Master the numbers. This topic is unusually number-heavy. Create flashcards for every threshold listed in this guide. Many questions are won or lost on whether you remember 90 versus 180 days or 100 versus 1,000 kg.
Tip 2: Learn the acronyms as concepts, not just letters. RCRA, CERCLA, SARA, EPCRA, TSCA, TCLP, LDR, SPCC, SWPPP, NPDES, TSDF, NPL, PRP, SAA, VSQG, SQG, LQG. Be able to state in one sentence what each one does.
Tip 3: Remember that solid waste includes liquids. This is a classic trick. Under RCRA, discarded liquids, sludges, and contained gases are all solid wastes.
Tip 4: Distinguish listed from characteristic. If a question describes a specific industry or chemical name, think listed (F, K, P, U). If it describes a property such as pH, flash point, or TCLP result, think characteristic (D codes).
Tip 5: Know who is liable under CERCLA. Strict, joint and several, and retroactive. If a question asks whether a company that legally disposed of waste decades ago can be held liable today, the answer is yes.
Tip 6: Connect to the hierarchy of controls. Questions about the best waste management approach almost always favor prevention or source reduction over treatment or disposal, just as elimination beats PPE.
Tip 7: Watch for qualifier words. Most, least, first, best, primary, and except change the correct answer. Read the question stem twice before looking at the options.
Tip 8: Understand the physical science. Clay has low permeability (good for liners), sand has high permeability (bad for containment). LNAPLs float, DNAPLs sink. Methane is explosive between 5 and 15 percent. These facts appear in both environmental and fire protection questions.
Tip 9: Use the process of elimination. If an answer option names the wrong agency (for example, OSHA regulating landfills) or the wrong law (TSCA for hazardous waste manifests), eliminate it immediately.
Tip 10: Think like an EHS manager, not a lawyer. The ASP tests practical application. When a scenario is presented, ask: what protects workers and the public, what satisfies the regulation, and what is the logical next step? The correct answer is usually the one that does all three.
Tip 11: Practice unit conversions. Know that 1 kg is about 2.2 lb, 1 gallon of water weighs about 8.34 lb (3.785 kg), and a full 55-gallon drum of water-like liquid weighs roughly 450 lb (about 205 kg). These help you quickly translate a drum count into a generator category.
Tip 12: Do not confuse Used Oil with Waste Oil, or Universal Waste with Hazardous Waste rules. Used oil and universal waste have relaxed, specific standards designed to encourage recycling. If a question mentions fluorescent lamps or batteries, think universal waste with a one-year accumulation limit.
Quick Reference Summary
- Four hazardous characteristics: Ignitable (flash point under 60 C / 140 F), Corrosive (pH 2 or below, 12.5 or above), Reactive, Toxic (TCLP).
- Four lists: F (non-specific sources), K (specific sources), P (acute), U (toxic).
- Generators: VSQG (100 kg or less), SQG (100 to 1,000 kg, 180/270 days, 6,000 kg cap), LQG (1,000 kg or more, 90 days).
- Satellite accumulation: 55 gallons or 1 quart acute, 3 days to move once full.
- Manifest: EPA Form 8700-22, retain 3 years, exception report at 45 days.
- Hierarchy: Reduce, Reuse, Recycle, Recover, Treat, Dispose.
- RCRA Subtitle C = hazardous, Subtitle D = non-hazardous, Subtitle I = USTs.
- CERCLA liability: strict, joint and several, retroactive.
- SPCC threshold: 1,320 gallons aboveground oil.
- PCBs: TSCA, 50 ppm.
- Landfill gas: about 50 percent methane, LEL 5 percent, UEL 15 percent.
- Construction stormwater: 1 acre, SWPPP, NPDES.
Final Thoughts
Land, Soil and Solid Waste rewards disciplined memorization paired with a clear understanding of the regulatory logic. Learn the framework (what is a waste, is it hazardous, who generated it, how much, how long can it be stored, where does it go, who is liable if something goes wrong), drill the numbers, and practice applying the hierarchy to scenarios. Approach each exam question by first identifying which law and which category it is testing, then eliminate options that do not fit, and select the answer that best protects people and meets the regulation. With this approach, the environmental questions on the ASP become some of the most predictable points on the exam.
Land, Soil and Solid Waste is a core topic within the Environmental Management domain of the BCSP Associate Safety Professional (ASP) examination. While many candidates come from a safety background and feel comfortable with hazard recognition and control, environmental topics often feel like foreign territory. The good news is that this subject area is highly structured, rule-based, and predictable once you understand the underlying framework. This guide explains why the topic matters, what it covers, how the regulatory and technical systems work, and exactly how to approach exam questions so you can earn these points with confidence.
Why Land, Soil and Solid Waste Is Important
Safety professionals are increasingly expected to function as EHS (Environment, Health and Safety) generalists. Many organizations assign environmental compliance duties to the safety department, which means an ASP must understand how improperly managed waste and contaminated land create legal liability, financial exposure, and direct hazards to workers and communities.
There are several reasons BCSP tests this material:
1. Worker exposure: Workers who handle waste drums, excavate contaminated soil, or operate landfill equipment face chemical, biological, and physical hazards. Understanding waste characteristics helps you anticipate exposures.
2. Regulatory liability: Under the Resource Conservation and Recovery Act (RCRA), waste generators are responsible for their waste from cradle to grave. Under CERCLA (Superfund), liability is strict, joint and several, and retroactive. A single mistake can cost an employer millions.
3. Emergency response: Spills, releases, and abandoned waste sites trigger HAZWOPER (29 CFR 1910.120) requirements, which connect directly to safety practice.
4. Sustainability and reputation: Modern safety management systems (ISO 45001, ISO 14001) integrate environmental stewardship with occupational safety.
5. Exam weighting: Environmental Management is one of the scored domains on the ASP blueprint, and waste management is among its most testable content because it contains specific numbers, definitions, and classifications that lend themselves to multiple-choice questions.
What It Is: Key Definitions and Concepts
Solid Waste
Under RCRA, the term solid waste is broader than it sounds. It includes any garbage, refuse, sludge, or other discarded material, whether it is solid, liquid, semi-solid, or contained gaseous material. A drum of spent solvent is a solid waste under RCRA even though it is a liquid. Solid waste is divided into non-hazardous waste (regulated under RCRA Subtitle D) and hazardous waste (regulated under RCRA Subtitle C).
Hazardous Waste
A solid waste becomes a hazardous waste in one of two ways:
1. Listed wastes appear on EPA lists in 40 CFR 261:
- F-list: wastes from non-specific sources (for example, spent halogenated solvents such as F001 and F002).
- K-list: wastes from specific industrial sources (for example, petroleum refining or wood preserving).
- P-list: acutely hazardous discarded commercial chemical products (highly toxic, very small quantity thresholds).
- U-list: toxic discarded commercial chemical products that are not acutely hazardous.
2. Characteristic wastes exhibit one or more of four properties:
- Ignitability (D001): liquids with a flash point below 60 degrees C (140 degrees F), ignitable compressed gases, oxidizers, or non-liquids that can cause fire through friction or spontaneous chemical change.
- Corrosivity (D002): aqueous wastes with pH less than or equal to 2 or greater than or equal to 12.5, or liquids that corrode steel at a rate greater than 6.35 mm (0.25 inch) per year.
- Reactivity (D003): unstable, reacts violently with water, generates toxic gases, or is capable of detonation.
- Toxicity (D004 through D043): determined by the Toxicity Characteristic Leaching Procedure (TCLP), which simulates leaching in a landfill. Contaminants include heavy metals (arsenic, barium, cadmium, chromium, lead, mercury, selenium, silver), pesticides, and organic compounds.
Remember the acronym ICRT (Ignitable, Corrosive, Reactive, Toxic) for the four characteristics.
Generator Categories
Generator status is based on the quantity of hazardous waste generated per calendar month:
- Very Small Quantity Generator (VSQG): 100 kg or less per month of hazardous waste and 1 kg or less of acutely hazardous waste. (Formerly called Conditionally Exempt Small Quantity Generator.)
- Small Quantity Generator (SQG): more than 100 kg but less than 1,000 kg per month. May accumulate on site up to 180 days (270 days if the TSD facility is more than 200 miles away), with a maximum of 6,000 kg on site at any time.
- Large Quantity Generator (LQG): 1,000 kg or more per month, or more than 1 kg of acutely hazardous waste. May accumulate on site up to 90 days with no quantity limit, but must have a written contingency plan, formal training, and emergency coordinator.
Useful conversion: 1,000 kg is approximately 2,200 pounds, which is roughly five 55-gallon drums of typical liquid waste. 100 kg is approximately 220 pounds, or about half a drum.
Satellite Accumulation Areas (SAA)
Generators may accumulate up to 55 gallons of hazardous waste (or 1 quart of liquid acute hazardous waste, or 1 kg of solid acute hazardous waste) at or near the point of generation under the control of the operator. Containers must be closed, labeled with the words Hazardous Waste, and marked with the hazards. Once the limit is reached, the container must be moved to the central accumulation area within 3 days.
Cradle-to-Grave and the Manifest System
RCRA tracks hazardous waste from the point of generation through transportation to its final treatment, storage, or disposal. The Uniform Hazardous Waste Manifest (EPA Form 8700-22) accompanies every off-site shipment. Generators must obtain an EPA Identification Number, use licensed transporters, and send waste only to permitted Treatment, Storage and Disposal Facilities (TSDFs). The e-Manifest system now allows electronic tracking. If a signed copy is not returned within 35 days (LQG), the generator must investigate; an Exception Report is required at 45 days.
Land Disposal Restrictions (LDR)
Also called the land ban, the LDR program prohibits land disposal of hazardous waste unless it has been treated to meet specific treatment standards. This prevents untreated hazardous waste from simply being buried.
Universal Waste
A streamlined set of rules covers widely generated hazardous wastes to encourage recycling: batteries, pesticides, mercury-containing equipment (thermostats), lamps (fluorescent bulbs), and aerosol cans. Universal waste may be accumulated for up to one year.
Used Oil
Used oil is managed under its own standards (40 CFR 279) and is not automatically a hazardous waste if it is recycled. Containers must be labeled Used Oil, not Waste Oil.
Non-Hazardous Solid Waste and Landfills (Subtitle D)
Municipal solid waste landfills must meet design criteria including composite liners (a flexible membrane liner over compacted clay), leachate collection systems, groundwater monitoring, methane gas monitoring and control, daily cover, and financial assurance for closure and post-closure care (typically 30 years). Leachate is the liquid that percolates through waste and picks up contaminants. Landfill gas is roughly half methane and half carbon dioxide; methane is explosive between 5 and 15 percent in air, which is why monitoring at the property boundary and in structures is required.
Other Disposal and Treatment Methods
- Incineration: destroys organics, reduces volume by up to 90 percent, requires air emission controls, produces ash that may itself be hazardous.
- Composting: aerobic biological decomposition of organic waste.
- Stabilization and solidification: binding contaminants (especially metals) in cement or similar matrix to reduce leaching.
- Deep well injection: regulated under the Safe Drinking Water Act Underground Injection Control program.
- Recycling and recovery: preferred over disposal.
The Waste Management Hierarchy
From most preferred to least preferred: Source Reduction (Prevention) - Reuse - Recycling - Energy Recovery - Treatment - Disposal. The Pollution Prevention Act of 1990 established source reduction as national policy. Think of this as the environmental equivalent of the hierarchy of controls: eliminating the waste at the source is always the best answer.
Land and Soil Contamination
CERCLA (Superfund), the Comprehensive Environmental Response, Compensation and Liability Act of 1980, addresses abandoned or uncontrolled hazardous waste sites. Key features:
- The National Priorities List (NPL) ranks the most contaminated sites using the Hazard Ranking System.
- Potentially Responsible Parties (PRPs) include current owners, past owners at the time of disposal, generators, and transporters.
- Liability is strict (no need to prove negligence), joint and several (any one party can be held liable for the entire cost), and retroactive.
- Removal actions are short-term emergency responses; remedial actions are long-term cleanups.
- The Reportable Quantity (RQ) is the amount of a hazardous substance that, if released, must be reported to the National Response Center.
- SARA Title III (EPCRA) added community right-to-know, Tier II reporting, and the Toxics Release Inventory.
Brownfields are previously developed properties where redevelopment is complicated by actual or perceived contamination. The Brownfields program provides liability relief and funding to encourage reuse.
Soil Properties Relevant to Contamination
- Permeability: how easily fluids move through soil. Clay has low permeability (good liner material); sand and gravel have high permeability (contaminants migrate quickly).
- Porosity: the void space in soil.
- pH and cation exchange capacity: affect how metals bind to soil.
- Vadose zone: the unsaturated soil above the water table; the saturated zone below holds groundwater.
- Plume: the body of contaminated groundwater moving down-gradient from a source.
- NAPLs: Non-Aqueous Phase Liquids. LNAPLs (such as gasoline) float on groundwater; DNAPLs (such as chlorinated solvents) sink.
Soil and Groundwater Remediation Technologies
- Excavation and off-site disposal: fast, simple, but expensive and shifts the problem.
- Soil vapor extraction (SVE): vacuum removes volatile organics from the vadose zone.
- Bioremediation: microorganisms degrade contaminants; can be in situ or ex situ (landfarming, biopiles).
- Phytoremediation: plants take up or stabilize contaminants.
- Pump and treat: groundwater extraction with surface treatment.
- Air sparging: injecting air below the water table to volatilize contaminants.
- Capping: covering contamination to prevent exposure and infiltration (containment, not destruction).
- Thermal desorption: heating soil to volatilize contaminants.
- In situ chemical oxidation: injecting oxidants such as permanganate or peroxide.
Soil Erosion and Sediment Control
Construction sites disturbing one acre or more must obtain NPDES stormwater permit coverage under the Clean Water Act and prepare a Stormwater Pollution Prevention Plan (SWPPP). Best management practices include silt fences, sediment basins, straw wattles, stabilized construction entrances, erosion control blankets, and phased grading to minimize exposed soil.
Spill Prevention and Response
The SPCC rule (Spill Prevention, Control and Countermeasure, 40 CFR 112) applies to facilities with aggregate aboveground oil storage over 1,320 gallons (or underground storage over 42,000 gallons) that could reasonably discharge to navigable waters. Requirements include secondary containment (typically 110 percent of the largest tank), inspections, training, and a written plan. Underground Storage Tanks (USTs) are regulated under RCRA Subtitle I with leak detection, corrosion protection, and spill and overfill prevention.
Related Waste Streams
- Asbestos: regulated under NESHAP (Clean Air Act) for demolition and renovation; disposal requires wetting, sealed labeled containers, and approved landfills.
- PCBs: regulated under TSCA (Toxic Substances Control Act), not RCRA; concentrations of 50 ppm or greater trigger requirements.
- Medical waste: primarily state regulated; OSHA Bloodborne Pathogens Standard governs worker protection.
- Radioactive waste: regulated by the NRC and DOE; low-level versus high-level waste.
- Electronic waste: often managed as universal waste under state programs; contains lead, mercury, and cadmium.
How It Works: The Waste Management Process Step by Step
1. Waste determination: At the point of generation, the generator must determine whether the material is a solid waste and, if so, whether it is hazardous (listed or characteristic). This is done using process knowledge or laboratory testing such as TCLP.
2. Classification and coding: Assign EPA waste codes (D, F, K, P, U) and DOT shipping description.
3. Accumulation: Store in compatible, closed, labeled containers in satellite or central accumulation areas with weekly inspections, secondary containment where required, and adequate aisle space.
4. Time and quantity tracking: Mark accumulation start dates and observe 90, 180, or 270 day limits based on generator status.
5. Preparation for shipment: Complete the manifest, apply DOT labels and placards, and use a licensed hazardous waste transporter.
6. Transport and disposal: Waste goes to a permitted TSDF; treatment must meet LDR standards before land disposal.
7. Recordkeeping and reporting: Retain manifests for 3 years, submit Biennial Reports (LQGs), maintain training records, and file contingency plans.
8. Contingency planning: LQGs need a written plan, an emergency coordinator, communication systems, and coordination with local responders.
9. Closure: When operations cease, accumulation areas and TSDFs must be decontaminated and closed according to approved plans.
For contaminated land, the process under CERCLA follows: Preliminary Assessment - Site Inspection - Hazard Ranking - NPL Listing - Remedial Investigation and Feasibility Study (RI/FS) - Record of Decision (ROD) - Remedial Design and Remedial Action - Operation and Maintenance - Deletion from the NPL.
How to Answer Exam Questions on Land, Soil and Solid Waste
ASP questions in this area tend to fall into five categories:
1. Definition and classification questions
Example style: A waste with a flash point of 120 degrees F would be classified as which characteristic hazardous waste? Answer: Ignitable (D001), because it is below 140 degrees F. Approach: memorize the four characteristics with their numeric thresholds and the four list letters with what they represent.
2. Threshold and quantity questions
Example style: A facility generates 800 kg of hazardous waste per month. What is its generator status and maximum accumulation time? Answer: Small Quantity Generator, 180 days (270 if TSDF is over 200 miles away). Approach: build a mental table of 100 kg, 1,000 kg, 1 kg acute, 90/180/270 days, 55 gallons, 1 quart, 3 days, 35/45 days, 1,320 gallons, 50 ppm PCBs, pH 2 and 12.5, 60 degrees C.
3. Regulatory jurisdiction questions
Example style: Which law governs cleanup of abandoned hazardous waste sites? Answer: CERCLA. Approach: match the law to its purpose: RCRA = active waste management cradle to grave; CERCLA = abandoned sites and cleanup liability; TSCA = PCBs and chemical substances; Clean Water Act = stormwater, SPCC, NPDES; Clean Air Act = asbestos NESHAP and landfill gas; SDWA = underground injection.
4. Hierarchy and best-practice questions
Example style: What is the most preferred method of managing waste? Answer: Source reduction. Approach: when a question asks for the most preferred, best, or first option, move up the hierarchy. When asked for least preferred, move down to disposal.
5. Scenario and application questions
Example style: During excavation, workers encounter stained soil with a solvent odor. What should be done first? Answer: Stop work, evacuate, and assess (treat as an unknown hazard). Approach: apply the safety professional mindset: protect people first, then contain, then characterize, then report, then remediate.
Exam Tips: Answering Questions on Land, Soil and Solid Waste
Tip 1: Master the numbers. This topic is unusually number-heavy. Create flashcards for every threshold listed in this guide. Many questions are won or lost on whether you remember 90 versus 180 days or 100 versus 1,000 kg.
Tip 2: Learn the acronyms as concepts, not just letters. RCRA, CERCLA, SARA, EPCRA, TSCA, TCLP, LDR, SPCC, SWPPP, NPDES, TSDF, NPL, PRP, SAA, VSQG, SQG, LQG. Be able to state in one sentence what each one does.
Tip 3: Remember that solid waste includes liquids. This is a classic trick. Under RCRA, discarded liquids, sludges, and contained gases are all solid wastes.
Tip 4: Distinguish listed from characteristic. If a question describes a specific industry or chemical name, think listed (F, K, P, U). If it describes a property such as pH, flash point, or TCLP result, think characteristic (D codes).
Tip 5: Know who is liable under CERCLA. Strict, joint and several, and retroactive. If a question asks whether a company that legally disposed of waste decades ago can be held liable today, the answer is yes.
Tip 6: Connect to the hierarchy of controls. Questions about the best waste management approach almost always favor prevention or source reduction over treatment or disposal, just as elimination beats PPE.
Tip 7: Watch for qualifier words. Most, least, first, best, primary, and except change the correct answer. Read the question stem twice before looking at the options.
Tip 8: Understand the physical science. Clay has low permeability (good for liners), sand has high permeability (bad for containment). LNAPLs float, DNAPLs sink. Methane is explosive between 5 and 15 percent. These facts appear in both environmental and fire protection questions.
Tip 9: Use the process of elimination. If an answer option names the wrong agency (for example, OSHA regulating landfills) or the wrong law (TSCA for hazardous waste manifests), eliminate it immediately.
Tip 10: Think like an EHS manager, not a lawyer. The ASP tests practical application. When a scenario is presented, ask: what protects workers and the public, what satisfies the regulation, and what is the logical next step? The correct answer is usually the one that does all three.
Tip 11: Practice unit conversions. Know that 1 kg is about 2.2 lb, 1 gallon of water weighs about 8.34 lb (3.785 kg), and a full 55-gallon drum of water-like liquid weighs roughly 450 lb (about 205 kg). These help you quickly translate a drum count into a generator category.
Tip 12: Do not confuse Used Oil with Waste Oil, or Universal Waste with Hazardous Waste rules. Used oil and universal waste have relaxed, specific standards designed to encourage recycling. If a question mentions fluorescent lamps or batteries, think universal waste with a one-year accumulation limit.
Quick Reference Summary
- Four hazardous characteristics: Ignitable (flash point under 60 C / 140 F), Corrosive (pH 2 or below, 12.5 or above), Reactive, Toxic (TCLP).
- Four lists: F (non-specific sources), K (specific sources), P (acute), U (toxic).
- Generators: VSQG (100 kg or less), SQG (100 to 1,000 kg, 180/270 days, 6,000 kg cap), LQG (1,000 kg or more, 90 days).
- Satellite accumulation: 55 gallons or 1 quart acute, 3 days to move once full.
- Manifest: EPA Form 8700-22, retain 3 years, exception report at 45 days.
- Hierarchy: Reduce, Reuse, Recycle, Recover, Treat, Dispose.
- RCRA Subtitle C = hazardous, Subtitle D = non-hazardous, Subtitle I = USTs.
- CERCLA liability: strict, joint and several, retroactive.
- SPCC threshold: 1,320 gallons aboveground oil.
- PCBs: TSCA, 50 ppm.
- Landfill gas: about 50 percent methane, LEL 5 percent, UEL 15 percent.
- Construction stormwater: 1 acre, SWPPP, NPDES.
Final Thoughts
Land, Soil and Solid Waste rewards disciplined memorization paired with a clear understanding of the regulatory logic. Learn the framework (what is a waste, is it hazardous, who generated it, how much, how long can it be stored, where does it go, who is liable if something goes wrong), drill the numbers, and practice applying the hierarchy to scenarios. Approach each exam question by first identifying which law and which category it is testing, then eliminate options that do not fit, and select the answer that best protects people and meets the regulation. With this approach, the environmental questions on the ASP become some of the most predictable points on the exam.
Test mode:
ASP - Land, Soil and Solid Waste Example Questions
Test your knowledge of Land, Soil and Solid Waste
Question 1
During excavation for a new foundation at a manufacturing plant, a contractor uncovers dark, petroleum-odor soil near the location of a former fuel storage tank. The plant manager wants the soil removed quickly so the project stays on schedule. Which action should the safety specialist recommend FIRST?
Question 2
At a construction site, the silt fence along the downslope perimeter is repeatedly overtopped during storms, and sediment reaches a nearby storm drain. Inspections confirm the fence is correctly installed and maintained. Large graded areas stay bare for several weeks between construction phases. Which change BEST addresses the underlying cause of the sediment release?
Question 3
In U.S. EPA land-revitalization terminology, which of the following best describes a brownfield?
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