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  • How did the January 6, 1998, final rule affect the definition of stationary source?

    How did the January 6, 1998, final rule ( 63 FR 640 ) affect the definition of stationary source, as it relates to the transportation exemption? The January 6, 1998 final rule amended the regulatory definition of stationary source by removing previous references to "active shipping papers" and "temporary storage"…

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  • Hydrochloric acid and hydrogen chloride listed separately

    Why are hydrochloric acid and hydrogen chloride listed separately in the list of regulated substances at 40 CFR §68.130? The aqueous form (hydrochloric acid) and the anhydrous form of this chemical (hydrogen chloride) have been assigned different thresholds.

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  • Must separate amounts of regulated substances be aggregated for threshold determinations?

    Drums containing regulated substances (listed in 40 CFR §68.130) are stored in several separate locations at a stationary source and there is no possibility that an accidental release in any of the individual storage areas would impact any of the other storage areas. Must the overall amount of the regulated…

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  • Are agricultural facilities subject to the risk management program requirements?

    Are agricultural facilities potentially subject to the risk management program requirements in 40 CFR Part 68? Yes. Although there is one specific exemption from the provisions of 40 CFR Part 68 for ammonia held by a farmer for use as an agricultural nutrient (40 CFR §68.125), there is no general…

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  • What does "control of the same person" mean?

    Control of the same person refers to corporate control, not site management. If two divisions of a corporation operate at the same site, even if each operation is managed separately, they will count as one source provided the other criteria are met because they are under control of the same…

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  • How are thresholds for regulated toxic substances in mixtures determined?

    Formaldehyde is listed as a regulated substance under 40 CFR 68.130 with the qualifier "(solution)." When determining whether a threshold amount of this substance exists in a process, should a person consider the weight of the entire solution, or simply the amount of formaldehyde in the solution? How are thresholds…

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  • Qualifier "solution" in the listing for formaldehyde

    Formaldehyde is listed in 40 CFR 68.130 with the qualifier "solution." Does the qualifier refer only to mixtures of formaldehyde and water, or does it apply to any liquid mixture containing formaldehyde? Formaldehyde (CAS No. 50-0-0) is listed with the qualifier "solution" because pure formaldehyde has a tendency to polymerize…

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  • Part 68 regulations compared to other CAA provisions

    Do the risk management program regulations at 40 CFR Part 68 place additional requirements on stationary sources that are currently in compliance with all other provisions of the Clean Air Act (CAA)? Yes. Owners and operators of stationary sources who meet the applicability criteria at 40 CFR §68.10 must comply…

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  • Assigning program level 1 if a public receptors is just beyond distance to endpoint

    Our distance to the endpoint for the worst-case release is 0.3 miles. The nearest public receptor is 0.32 miles away. What tools are available to document that the public receptor is beyond the distance to the endpoint so we can qualify for Program 1? The results of any air dispersion…

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  • Why do the risk management program regulations only apply to stationary sources?

    Why have transportation activities been exempted from compliance with the risk management program regulations at 40 CFR Part 68? Why do these regulations apply only to stationary sources? While EPA agrees that industry, local planners, and first responders need to recognize the public safety hazards associated with transportation, the Clean…

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  • Process that meets Program 1 requirements and Program 3 applicability

    Program 3 applies to processes in certain NAICS codes as well as any process subject to the OSHA Process Safety Management (PSM) standard, unless the process is eligible for Program 1. If a process meets the requirements of Program 1, but is also in NAICS code 32211 (one of those…

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  • Can a process qualify for Program 1 if it has had an accident?

    A process with more than a threshold quantity of a regulated substance had an accident with off-site consequences three years ago. After the accident, we altered the process to reduce the quantity stored onsite. Now the worst-case release scenario indicates that there are no public receptors within the distance to…

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  • Program level 1 eligibility and accident history

    A process with more than a threshold quantity of a regulated substance had an accident with off-site consequences three years ago. After the accident, we altered the process to reduce the quantity stored on site, although the quantity still exceeds the threshold quantity. Now the worst case release scenario indicates…

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  • Program level 3 applicability and whether states have delegated OSHA programs

    I am a publicly owned facility in a state with a delegated OSHA program. Why are my processes considered to be in Program 3 when the same processes in a state where federal OSHA runs the program are in Program 2? Federal OSHA cannot impose its rules on state or…

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  • Threshold determination for a single process with oleum and sulfur trioxide

    Oleum, which is a mixture of sulfuric acid and sulfur trioxide, is listed as a regulated toxic substance in 40 CFR §68.130. Sulfur trioxide is also listed individually as a regulated toxic substance. If a single process consists of one vessel containing oleum and one vessel containing sulfur trioxide, must…

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