Learn the Issues
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Must I anticipate a specific cause for the worst-case scenario for a toxic substance?
When analyzing the worst-case scenario for regulated toxic substances, must I anticipate a specific cause (e.g., fire, explosion, etc.) of the scenario? No. The worst-case analysis for a release of regulated toxic substances must conform to specific assumptions as identified in § 68.25(c) and (d). Anticipated causes of the release…
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Identifying public receptors and property with restricted access
Does public receptor cover only buildings on a property or the entire property? If the owner of the land next to my site restricts access to the land, is it still a public receptor? Public receptors are not limited to buildings. For example, if there are houses near your property…
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How many worst-case release scenarios must be analyzed and documented in the RMP?
As a part of the hazard assessment requirements in 40 CFR Part 68, Subpart B, I must analyze worst-case release scenarios and document certain analyses in my risk management plan (RMP). How many worst-case release scenarios must be analyzed, and how many analyses must be specifically documented in the RMP…
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Flammable event with different time duration
What if a flammable event has a different time duration than the 5 kw/m2 for 40 seconds? EPA recognizes that flammable events may occur for a different amount of exposure time. Therefore, the owner or operator should determine the distance to an equivalent exposure - e.g. if the flammable event…
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Does the distance to endpoint start at the process or stationary source boundary?
When selecting the worst-case release scenario for Program 2 and 3 processes as required by 40 CFR §68.25, a stationary source owner or operator must analyze the release scenario that results in the greatest distance to an endpoint. Does the "greatest distance to an endpoint" refer to the greatest total…
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Do environmental receptors include areas that are not Federal Class I areas?
Do environmental receptors include areas that are not Federal Class I areas under the CAA? Yes. The list of environmental receptors in Part 68 includes areas in addition to those that qualify as Federal Class I areas under CAA section 162. Under Part 68, national parks, monuments, wilderness areas, and…
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Are rivers used for recreation considered "public receptors"?
A process covered under 40 CFR Part 68 is eligible for Program 1 requirements if it meets all of the criteria listed in 40 CFR §68.10(b). One of those criteria is that the distance to a toxic or flammable endpoint for a worst-case release assessment is less than the distance…
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Remediation and Restoration Projects for Detroit River AOC
Table describing remediation work on the Detroit River AOC..
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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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Cleanup Activities in the Lower Rouge River – Old Channel
Rouge River RAPs and RAP updates
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Documents on Restoring the Torch Lake AOC
Documents of projects and other actions that work towards restoring the AOC and removing beneficial use impairments.
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St. Louis River Area of Concern BUI Removals Information
St. Louis River AOC bui removal document
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2015 GLRI Grants for Clinton River
Habitat Restoration Grant synopsis of $20 million awarded from GLRI.
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Great Lakes Phytoplankton Monitoring
Great Lakes phytoplankton monitoring program
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Support Documents for Asbestos Reporting Rule Section 21 Petition
Support Documents for Asbestos Reporting Rule Section 21 Petition
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Study Provides New Insights Into Impacts of Wildland Fires on Ozone Monitoring Equipment in Kansas
New research from EPA shows wildland fire smoke may affect the accuracy of some regulatory monitoring instruments that measure ozone. The measurements from these instruments are needed by state, local, and tribal air quality agencies to determine if levels
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How-To Manual to Update and Enhance Your Local Source Water Protection Assessments
This manual is intended to help Source Water Protection (SWP) Partners protect the raw sources of their drinking water from Potential Contaminant Sources (PCSs).
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U.S.-Canada Cooperation in the Salish Sea
Collaboration between the EPA and Canada to address shared environmental challenges in the Salish Sea.
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Water Sampling Results in the Navajo Nation
Documents providing information about EPA's work to provide safe drinking water to communities affected by uranium contamination on the Navajo Nation.
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Report of the Chief FOIA Officer to the U.S. Department of Justice, 2021
FOIA CHief Officers Report 2021