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  • Do the quantities of interconnected vessels need to be aggregated for the worst-case release scenario analysis?

    Pursuant to the risk management program regulations, facilities must perform an offsite consequence analysis for the worst-case release scenario. Do the quantities of two separate vessels that are interconnected with a closed valve need to be aggregated for the worst-case release scenario analysis? No. Worst-case release is defined as the…

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  • Active mitigation systems (e.g., scrubbers) and alternative release scenarios

    I run a wastewater treatment plant that is subject to the risk management program regulations in 40 CFR Part 68 for a covered process containing chlorine. A chlorine scrubber system at the plant is designed to prevent any possible releases from reaching a toxic endpoint offsite. How does this active…

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  • Vulnerable Zone Determination

    Vulnerable zones are areas that could be affected by a release from a chemical accident at a facility subject to the risk management program requirements in 40 CFR Part 68. How can one determine if they live or work within a vulnerable zone? The Vulnerable Zone Indicator System (VZIS) allows…

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  • Identification of Industrial Buildings, Commercial Buildings, and Recreational Areas

    Pursuant to the hazard assessment requirements in 40 CFR Part 68, Subpart B, an owner or operator is required to conduct an offsite consequence analysis and analyze a worst-case release scenario and alternative release scenarios as part of a risk management plan (RMP). When completing these scenarios, public receptors need…

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  • Why were ERPG-2 values selected as toxic endpoints instead of ERPG-3?

    An endpoint is needed for analysis of offsite consequences of potential accidental releases of regulated substances. The endpoint to be used for each regulated toxic substance is provided in Part 68, Appendix A, and is the Emergency Response Planning Guideline level 2 (ERPG-2) developed for the substance by the American…

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  • Release scenarios for substances exhibiting flammability and toxicity

    Under the hazard assessment requirements in 40 CFR Part 68, Subpart B, an owner or operator must analyze worst-case release scenarios and more likely alternative release scenarios, and must document a five-year accident history. If a regulated substance exhibits characteristics of both toxicity and flammability, should owners and operators consider…

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  • Worst-case “quantity released” reporting for a mixture

    In section 2, element 2.5, of an RMP, facilities must report the quantity of toxic chemical that the facility used for the worst-case analysis. When reporting this data element in RMP*eSubmit for a mixture, should facilities report the entire weight of the toxic mixture potentially being released or only the…

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  • Worst-case release scenarios for salt domes

    Would all of the regulated substances stored in a salt dome be assumed to be released in the worst-case scenario? The worst case scenario for salt domes would be examined in a manner similar to that for underground storage tanks. Reservoirs or vessels sufficiently buried underground are passively mitigated or…

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  • Air dispersion models for release scenarios

    Under the hazard assessment requirements of 40 CFR Part 68, Subpart B, an owner or operator is required to analyze a worst-case release scenario and more likely alternative release scenarios. Has EPA developed any air dispersion models for conducting these evaluations? Is EPA's TScreen model an appropriate technique? EPA has…

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  • Differences between the risk management program and EPCRA

    How do the Clean Air Act (CAA) risk management program requirements differ from the hazardous chemical reporting requirements under the Emergency Planning and Community Right-to-Know Act (EPCRA)? The hazardous chemical reporting requirements under EPCRA §§311 and 312 (40 CFR Part 370) are separate and distinct from those under CAA §112(r)…

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  • What are the anticipated uses of risk management plans?

    What are some of the anticipated uses for the Risk Management Plans (RMPs)? RMPs will be used by many different audiences in many different ways. Industry and trade associations will use RMPs to understand common industry practice and identify practices that could be utilized to reduce risks at facilities. The…

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  • Are OSHA Voluntary Protection Program facilities exempt from audits?

    If we are a Voluntary Protection Program (VPP) facility under OSHA’s VPP program, are we exempt from audits? You are exempt from audits that are based on the accident history of your industry sector or on random, neutral oversight. However, part 68 includes other criteria for deciding what facilities to…

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  • Correcting RMP with new emergency contact information

    Pursuant to the risk management program regulations, the owner or operator of a regulated stationary source is required to submit a correction within one month of any change in the emergency contact information (40 CFR §68.195(b)). What should the owner or operator do for the required correction if they do…

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  • RMP enforcement powers - states, LEPCs, and fire departments

    Would states that have not applied for or received delegation of Clean Air Act 112r/RMP have any enforcement powers? Do LEPCs or fire departments have any enforcement powers? Would this be through the citizen suit provision or is there another statutory mechanism? States that have not applied for or received…

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  • What are the responsibilities of the Chemical Safety and Hazard Investigation Board?

    Section 112(r)(6) of the CAA as amended in 1990 required the President to establish a Chemical Safety and Hazard Investigation Board. Has the Board been established? What are the responsibilities of this Board? The Chemical Safety and Hazard Investigation Board has been established. The Board's responsibilities include investigating chemical accidents…

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