Learn the Issues
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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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Distinction between "process" and "covered process"
What is the distinction between a "process" and a "covered process" under the risk management program regulations at 40 CFR Part 68? Process means any activity involving a regulated substance, including any use, storage, manufacturing, handling, or on-site movement of such substances, or combination of these activities. A "covered process"…
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When must RMPs be submitted, updated, and corrected?
When must the risk management plans (RMPs) required under 40 CFR Part 68, Subpart G, be submitted? When are updates and corrections required? Compliance with the risk management program requirements (including submission of an RMP) is required by the date on which a regulated substance first becomes present above a…
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Different results using ALOHA and RMP*Comp
I tried running the same scenarios in ALOHA and in RMP*Comp. I got different answers. Why? The results you obtain using RMP*Comp may not closely match the results you obtain running the same release scenario in a more sophisticated air dispersion model such as ALOHA or DEGADIS. That's because of…
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Worst-case release scenarios for toxics and flammables involving the same process
At my facility, if the worst-case release scenarios for regulated toxic substances and the worst-case scenario for regulated flammable substances involve the same process, must I analyze both? Yes. If the worst-case release scenarios for regulated toxic substances and regulated flammable substances in Program 2 and 3 processes are associated…
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How often must compliance audits be performed?
How often must owners or operators of stationary sources subject to the risk management program regulations perform compliance audits? The regulations at 40 CFR §§68.58(a) and 68.79(a) state that owners or operators must certify that they have evaluated compliance with the applicable prevention program provisions at least once every three…
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When does the accident history's five-year period begin?
The hazard assessment requirements under 40 CFR Part 68, Subpart B include provision of a five-year accident history, as specified at §68.42. When does the five-year period to be reported in the accident history begin? The five-year accident history must include information on all accidental releases from covered processes meeting…
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Definition of recreational area for determining offsite impacts in RMP
What is considered a recreational area? Recreational areas would include land that is designed, constructed, designated, or used for recreational activities. Examples are national, state, county, or city parks, other outdoor recreational areas such as golf courses or swimming pools and bodies of waters (oceans, lakes, rivers, and streams) when…
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RMP Records Maintained Onsite
Pursuant to 40 CFR Part 68, Subpart G, the owner or operator of a stationary source subject to the risk management program regulations in Part 68 must develop and submit a risk management plan (RMP). Does the owner or operator have to maintain a written copy of the RMP on…
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Mystic River Watershed Municipal Subcommittee Meeting, November 15, 2012
Document(s) from the November 15, 2012 Municipal Subcommittee Meeting for the Mystic River Watershed.
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Mystic River Watershed Steering Committee Meeting, October 13, 2016
Document(s) from the October 13, 2016 Steering Committee Meeting for the Mystic River Watershed.
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Mystic River Watershed Open Space Subcommittee Meeting, September 29, 2016
Document(s) from the September 29, 2016 Open Space Subcommittee Meeting for the Mystic River Watershed.
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Mystic River Watershed Federal Partnership Grant Informational Event, March 31, 2016
Document(s) from the March 31, 2016 Federal Partnership Grant Informational Event for the Mystic River Watershed.
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Mystic River Watershed Steering Committee Meeting, March 10, 2016
Document(s) from the March 10, 2016 Steering Committee Meeting for the Mystic River Watershed.
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Mystic River Watershed Federal Partnership Annual Call, September 1, 2015
Document(s) from the September 1, 2015 Federal Partnership Annual Call for the Mystic River Watershed.
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Municipal Solid Waste Landfills: New Source Performance Standards (NSPS), Emission Guidelines (EG) and Compliance Times: Reconsideration and Stay of Effective Date
Letter to the petitioners, the agency said it also intends to issue a 90-day stay of the effectiveness of both the NSPS (subpart XXX) and the emission guidelines (subpart Cf).
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Clean Air Act Permitting for Greenhouse Gases
Provides basic information about the greenhouse gas air permitting program, including the different types of permits and who issues them
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Rescission of Preconstruction Permits Issued Under the Clean Air Act
Clean Air Act Permitting Rescission of Preconstruction Permits Issued Under the Clean Air Act
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Region 10 Tribal Info Box
This page describes the Region 10 listserv for tribes in Alaska, Idaho, Oregon, and Washington.
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Success Stories in Reducing Waste
2018 – 2021 awardee success stories for Sustainable Materials Management partnership programs compiled into a searchable table.