Used Oil Tank at 1,350 ppm Halogens and a 118 °F Flash Point
Tidewater Fleet Services maintains 220 tractors and runs an on-site used oil program. Used crankcase oil drains into a 1,000-gallon aboveground tank; a permitted oil recycler picks it up every six weeks and sends it to an energy-recovery burner. The recycler's acceptance limit is 1,000 ppm total halogens, with no visible water or solids. For several months, mechanics have been pouring the spent solvent from the brake-washer service-about 15 gallons a month of D001 ignitable solvent, some batches chlorinated-into the used oil tank because 'it's all oil and the burner can take it.' The shop foreman signs the used oil pickup tickets. A new sample shows 1,350 ppm total halogens by EPA Method 9077, and the flash point by Pensky-Martens closed cup is 118 °F. The recycler rejects the load and asks for a waste characterization. The terminal manager wants to pump 300 gallons of the tank contents into a blender truck of No. 2 diesel to bring the halogen number under 1,000 ppm and re-offer it as used oil. The tank has no secondary containment and sits 30 feet from a storm drain.
1. Determine the regulatory status of the tank contents, and explain what the 1,350 ppm halogen result and the 118 °F flash point mean together.
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The tank is not used oil anymore; it is hazardous waste, and two independent lines of reasoning get there.
Line 1-the characteristic survives. Under 40 CFR 279.10(b), used oil mixed with hazardous waste is hazardous waste, with a limited exception for mixtures with characteristic-only wastes where the mixture no longer exhibits a characteristic-279.10(b)(2). Here the brake-washer solvent is D001 (flash point below 140 °F), and the mixture's flash point is 118 °F. The mixture still exhibits the characteristic, so the exception does not apply and the tank contents are D001 hazardous waste.
Line 2-the halogen presumption. Used oil containing more than 1,000 ppm total halogens is presumed under 279.10(b) to have been mixed with halogenated hazardous waste and is therefore presumed hazardous waste. At 1,350 ppm the presumption is triggered; the burden shifts to the facility to rebut it.
Note that either line standing alone is enough. The flash point result also means the material cannot be burned as used oil fuel on the current basis-the recycler's contract and the burner's authorization both assumed a used oil stream.
Consequences: the shop is now a generator of D001 hazardous waste; shipments require a hazardous waste manifest and a permitted transporter and TSDF rather than used oil pickup tickets; the receiving facility must handle the material under its waste permit and land disposal restrictions; and the foreman's signatures on the earlier tickets may have misrepresented the stream.
2. Evaluate the terminal manager's dilution plan. Is it a legitimate rebuttal of the halogen presumption, and what is a legitimate rebuttal?
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The dilution plan should be refused. Blending with diesel to push the number below 1,000 ppm does not change what the material is-it changes what the sample reads. The presumption rebuttal is about the source of the halogens, not the concentration after blending, and dilution to evade a regulatory threshold is exactly the pattern regulators treat as sham recycling. It also creates a fuel that the recycler did not agree to take, misrepresents the waste to the receiving facility, and exposes the company to a knowing-violation theory plus potential liability under the used oil burner's permit.
A legitimate rebuttal would require demonstrating that the halogens come from a non-hazardous source-for example, halogenated compounds present in the virgin oil, or contamination from a non-hazardous chlorinated material-supported by batch data, supplier information, and analytical work beyond a single total-halogen number. There is also a narrow rebuttal showing the halogenated waste mixed in is a characteristic waste and the mixture does not exhibit a characteristic.
That second path is closed here. The 118 °F flash point means the mixture still exhibits D001, so no rebuttal can rescue the material from hazardous waste status regardless of what happens to the halogen number.
The right move: stop blending, classify and profile the tank as D001 hazardous waste, and ship it to a permitted facility that can handle it. Then clean the tank before returning it to used oil service, and find the source of the halogens.
3. What must the shop do operationally going forward-containers, records, training, and shipping?
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Source control. Give the brake-washer solvent its own labeled container, accumulate it as hazardous waste, and put a lockable lid on the used oil fill so that 'it's all oil' improvisation stops. The chlorinated and non-chlorinated solvent batches should not be combined casually either; the chlorinated material is what drives the halogen number.
Containers and containment. The 1,000-gallon tank needs secondary containment or a berm, and the storm drain 30 feet away needs a drain seal and a spill kit. Evaluate SPCC applicability based on total aboveground oil storage capacity at the site, and check the stormwater pollution prevention plan.
Records. Profile and characterize the tank contents; retain the analytical results and the waste determination. Keep used oil sampling records and vendor specifications, and stop treating a foreman's signature on a pickup ticket as the full record for a stream that has changed composition.
Training. Train mechanics and the foreman on what may and may not go into the used oil tank, on the consequences of mixing, and on the fact that used oil mixed with hazardous waste loses the used oil exemption. Add the point to the new-hire orientation.
Shipping. Ship the tank contents as hazardous waste: a manifest, a permitted transporter, and a DOT classification based on the characteristics-flash point 118 °F puts it in Class 3, with the proper shipping name and packing group determined by the flash point and boiling point. Note that the fixed 1,000-gallon tank is storage, not a shipping package; over-the-road movement must be in the transporter's permitted container. Inspect the tank weekly and keep the inspection log with the tank, not in the office.