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  • Ammonia used as agricultural nutrient held by farmers and the general duty clause

    Does the exemption at 40 CFR 68.125 for "ammonia used as an agricultural nutrient, when held by farmers" apply to the CAA Section 112(r)(1) general duty clause? No. The exemption for ammonia held by farmers for use as fertilizer applies only to the provisions of the risk management program regulations…

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  • Applicability for a process at a facility connected to another facility by piping

    The definition of process would seem to say that my process is part of the larger company’s process because they are interconnected. Why can’t the larger company just include my process in its RMP? Your process is not part of the larger company’s stationary source because it does not meet…

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  • Is methane generated on site and used for fuel subject to Part 68?

    A wastewater treatment plant generates methane through a natural digestion process, then stores and uses the methane as fuel. Under 40 CFR Part 68, must the owner or operator of this stationary source evaluate the amount of methane to determine whether more than a threshold amount is present in any…

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  • Ammonia present in ammonium hydroxide

    The list of regulated toxic substances at 40 CFR Section 68.130 includes both "ammonia (anhydrous)" and "ammonia (conc 20% or greater)," but does not include a specific listing for "ammonium hydroxide." The Chemical Abstract Registry Service (CAS) number for ammonium hydroxide is 1336-21-6, and the CAS number for ammonia is…

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  • Is gasoline exempt from the requirements of Part 68?

    Is gasoline exempt from the requirements of 40 CFR Part 68? Although gasoline is not specifically listed as a regulated substance under 40 CFR Section 68.130, it may contain one or more regulated substances. On January 6, 1998 ( 63 FR 640 ), EPA exempted from threshold determination regulated flammable…

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  • Compliance date for adding covered processes

    What happens if I bring a new covered process on line (e.g., install a second storage tank) after submitting my original RMP? For a new covered process added after the initial compliance date, you must be in compliance on the date you first have a regulated substance above the threshold…

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  • Covered chemicals and the definition of process

    Does a chemical need to be in a process to be covered by the CAA §112(r) risk management program requirements? The risk management program requirements apply to owners and operators of stationary sources that have more than a threshold quantity of a regulated substance contained in a process (40 CFR…

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  • What is the definition of a "technically qualified individual"?

    For the purpose of determining whether more than a threshold amount of a regulated substance is present at a stationary source under 40 CFR Part 68, certain exemptions may apply. One exemption is for regulated substances that are "manufactured, processed, or used in a laboratory at a stationary source under…

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  • If a permit is prioritized for enhanced outreach, does this mean that EPA will require stricter emission or discharge limits, or deny a permit?

    An EPA regional’ office’s decisions on whether to issue a permit and, if so, the conditions to impose within a permit are distinct from the EPA regional office’s decisions about the outreach EPA may perform during the permitting process. EPA’s decisions on whether to issue a permit and what permit…

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  • Is a source in compliance with OSHA's PSM already in compliance with Part 68?

    If a stationary source includes processes that are subject to both the OSHA process safety management (PSM) standard and the Program 3 risk management program requirements, what must the owner or operator of the stationary source do to demonstrate compliance under 40 CFR Part 68? A source owner or operator…

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  • Are different substances aggregated for threshold determinations?

    A toxic substance is never aggregated with a different toxic substance to determine whether a threshold quantity is present. If your process consists of co-located vessels with different toxic substances, you must determine whether each substance exceeds its threshold quantity. A flammable substance in one vessel is never aggregated with…

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  • Are explosives listed regulated substances under CAA 112(r)?

    No. Explosives classified by the Department of Transportation as Class 1, Division 1.1 were initially listed as regulated substances with a threshold quantity of 5,000 pounds because of their potential to cause offsite impacts ( 59 FR 4478 ; January 31, 1994). In accordance with a Settlement Agreement between EPA…

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  • Applicability for piping between companies

    I operate a single covered process on a site owned by a large company. I manufacture a regulated substance that I pipe to the other company for use in its processes. At what point do the piping and substance become part of the other company’s stationary source? The answer will…

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  • Determining thresholds for different chemicals in interconnected vessels

    According to the definition of "process" in 40 CFR §68.3, any group of vessels that are interconnected is considered to be a single process. If a stationary source has two interconnected vessels and one contains 6,000 pounds of butane while the other contains 6,000 pounds of propane, is this a…

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  • Are "tube" trailers considered a single process?

    Tube trailers carry bulk liquids that are stacked in a rack type arrangement on the back of a truck trailer. This arrangement often is used to carry highly hazardous materials such as anhydrous hydrogen chloride. The tubes are manifolded together, but usually only one tube at a time is connected…

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