17.2 TCLP Characterization and D008

5.0 mg/L in the leachate is D008 — not 5 µg/ft² on a wipe

Quick Answer: A solid waste (except manufactured-gas-plant waste) exhibits the toxicity characteristic if, using the Toxicity Characteristic Leaching Procedure (TCLP, SW-846 Method 1311), the extract from a representative sample contains any Table 1 contaminant at a concentration equal to or greater than the regulatory level (40 CFR 261.24). For lead, that level is 5.0 mg/L. The EPA hazardous waste number is D008 (CAS 7439-92-1). 5.0 mg/L counts. 4.9 mg/L does not. TCLP is a leach test. It is not total lead in mg/kg, not an XRF mg/cm² reading, and not a dust wipe in µg/ft². Paint chips, dust, sludge, and filters often fail; whole components sometimes do not. Never assume.

Section 17.1 named the piles. This section is how RCRA decides whether a pile that is not lawfully excluded is characteristic hazardous waste. The household exclusion (Section 17.3) can take residential LBP waste out of Subtitle C even when the chips would have failed TCLP. That exclusion is not a characterization, and it does not apply to a non-residential job. When you must decide D008, you use 261.24.

How TCLP works in plain language

Landfills are acidic. Rainwater and decaying garbage make a weak acid that can pull metals out of solid waste and into leachate that might reach groundwater. Method 1311 is a laboratory imitation of that process:

1. The lab takes a representative sample of the waste you actually generated.
2. If the waste has enough solids, the lab extracts it with a specified acetic-acid leaching fluid at a 20:1 liquid-to-solid ratio, with agitation, for a set time.
3. The lab filters the mixture and analyzes the liquid extract (the leachate) for Table 1 contaminants, including lead.
4. If the waste contains less than 0.5 percent filterable solids, 261.24(a) says the waste itself, after filtering, is the extract.
5. Compare the extract, in mg/L, to Table 1. Lead ≥ 5.0 mg/L → toxicity characteristic → waste code D008.

Equal to or greater than. A result of 5.0 mg/L is D008. Do not round 5.0 down because it feels like a tie. Do not round 4.96 up because it feels close.

Units traps that fail this exam:

A useful screening idea from Method 1311's 20:1 extraction is the so-called 20-times check: if every milligram of lead in the solid dissolved, the extract still could not reach 5.0 mg/L unless total lead were at least about 100 mg/kg (20 × 5). Concentrated chips and dust are typically thousands of mg/kg and often fail. A bulky wood door may sit near or below that range or still fail once the paint film is crushed. The 20-times check is screening logic, not a license to skip TCLP or generator knowledge when you need a determination. If total lead is high enough that a fail is possible, you test or you have documented knowledge — you do not guess.

Representative sampling is the whole determination

261.24 says representative sample. 40 CFR 262.11 says a person who generates a solid waste must determine whether it is hazardous, using testing, knowledge, or both. Supervisors do not become chemists, but they do decide what goes in the sample jar.

Sample the stream you generated.

• Chips sampled as chips. Do not dilute a jar of scrape-chips with clean framing lumber and call the mix representative of the chip pile.
• A whole door sampled as the door. Do not peel only the paint film, TCLP that film, and assign D008 to every stick of wood on the truck unless that is actually how you will dispose of it (for example, you stripped the paint into its own drum).
• Filters sampled as loaded filters, not as the cardboard box they shipped in.
• Soil sampled as the excavated soil, not as the 400 ppm play-area composite the risk assessor already reported. Hazard ppm is not TCLP mg/L.

Do not average away a hotspot. If one sample of a chip drum is 8 mg/L and another is 0 mg/L, you do not report 4 mg/L and call the drum non-hazardous. Known hot material is its own stream, or the whole mixed load is managed as hazardous. EPA's TCLP technical assistance has made the same point: the regulatory average is not a license to bury a fail inside a pass.

Generator knowledge can include process knowledge (this drum is nothing but scrape-chips from 4.0 mg/cm² paint; similar chip streams from this firm have failed TCLP) plus prior lab data. Knowledge is not I have been doing this twenty years and doors never fail. If you do not know, test.

Worked example — two piles, one XRF. Interior doors XRF at 3.8 mg/cm². Pile A is the doors, intact. Pile B is the wet-scrape chips from the jambs plus the HEPA filter. A representative TCLP of Pile A returns 1.2 mg/L — not D008. A representative TCLP of Pile B returns 22 mg/L — D008. Mixing B into A to get a single truck that 'probably passes' is not representative sampling. It is concealment of a characteristic waste.

Worked example — 4.9 versus 5.0. The lab reports TCLP lead 5.0 mg/L on the sludge. That is D008. The helper wants to resample until a 4.9 appears. Resampling a different representative aliquot because the first one was mishandled is laboratory quality control. Resampling until you like the number is not.

Why the concentrated streams fail more often

TCLP rewards surface area and concentration. Paint chips are almost pure film. Dust and HEPA cake are fines. Chemical-stripper sludge is lead paste. Those materials present a lot of lead to the acetic acid. A whole window, door, or piece of siding presents a thin film on a large mass of wood or metal. After the lab crushes a representative piece, the extract is often below 5.0 mg/L — often, not always. Weathered, thick, or alligatored films, metal components with little substrate mass, and debris that is really chips in a bag labeled 'trim' can still fail.

Never assume is the exam sentence. Characterized waste or a lawful exclusion (Section 17.3). There is no third path called it looks like a door so it is C&D.

Other Table 1 metals (arsenic, cadmium, chromium, and the rest) have their own codes. Lead abatement sludge from solvent strippers may also be ignitable (D001) if the flash point is low. Those are extra determinations, not substitutes for the lead TCLP.

What the supervisor does with a D008 result

If the exclusion in Section 17.3 does not apply and TCLP lead is ≥ 5.0 mg/L, the waste is hazardous waste D008. That triggers generator duties: EPA identification number (for SQG and LQG), Uniform Hazardous Waste Manifest, licensed transporter, licensed TSDF, land-disposal restrictions, and accumulation-time limits under Part 262. Those mechanics are Section 17.3. This section's job is to get the number and the code right.

If TCLP lead is below 5.0 mg/L and no listing applies, the waste is not D008. It is still lead-containing solid waste. You still contain it, you still keep children off it, and the authorized state may still regulate it more tightly than EPA. A pass on TCLP is not permission to dump it in a play area.

Supervisor decision test before the lab pickup. (1) Did I sample each stream, not a composite of doors-plus-chips? (2) Is the lab running Method 1311 and reporting mg/L in the extract? (3) Am I comparing to 5.0 mg/L, counting equality as a fail? (4) Did I refuse to average a hotspot into a pass? (5) Am I about to confuse this number with 5 µg/ft², 1.0 mg/cm², or 400 ppm?

Official sources: 40 CFR 261.24 (TCLP Method 1311; Table 1 lead 5.0 mg/L; D008); 40 CFR 261.3; 40 CFR 262.11 (hazardous-waste determination); 40 CFR 745.223 (hazardous waste means 261.3).