Learn the Issues
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CWA-09-2025-0059: Nevada Tri Partners, LLC and Damonte Ranch Commerce Center, LLC; Reno, Nevada
Consent agreement and proposed final order In the Matter of Nevada Tri Partners, LLC and Damonte Ranch Commerce Center, LLC, Reno, Nevada. EPA Docket Number CWA-09-2025-0059.
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Events Related to Anaerobic Digestion on Livestock Farms
List of events to learn more about anaerobic digestion systems and connect with industry, researchers and operators.
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AgSTAR Case Studies
Project case studies, reports and presentations that provide additional information and details about farm-based anaerobic digester projects
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AgSTAR Project Development Handbook
A handbook for those considering biogas technology as a manure management option, it provides a step-by-step method to determine what biogas system is appropriate for a livestock facility
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Learning About Biogas Recovery
Describes the anaerobic digestion process and the benefits of anaerobic digestion. Anaerobic digestion is the process through which bacteria break down organic matter without oxygen.
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AirToxScreen Frequent Questions
Listing of frequent questions about AirToxScreen and individual assessments
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New England Results of the 2014 National Air Toxics Assessment
Learn more about the New England results of the 2014 National Air Toxics Assessment.
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New England Results of the 2011 National Air Toxics Assessment
Learn more about the New England results of the 2011 National Air Toxics Assessment.
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Quantity of a regulated substance in an aqueous solution
When using RMP*Comp to conduct an offsite consequence analysis (OCA), a facility must specify the quantity released. What quantity should be entered for a regulated toxic substance in an aqueous solution, the total quantity of the aqueous solution or just the quantity of the toxic substance? The entire quantity of…
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Using meteorological station data for off-site consequence analyses
For the purpose of the offsite consequence analyses required under 40 CFR Part 68, Subpart B, there are several instances in which data gathered at a local meteorological station may be used to establish the modeling parameters of wind speed, atmospheric stability, temperature, and humidity for the stationary source. How…
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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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No trespassing signs restricted access onsite or offsite public receptor
The definition of public receptor is "offsite residences, institutions (e.g., schools, hospitals), industrial, commercial, and office buildings, parks, or recreational areas inhabited or occupied by the public at any time without restriction by the stationary source ..." Offsite is further defined to include "areas within the property boundary [of the…
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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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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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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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Distance to endpoint calculations used by RMP*Comp
Does RMP*Comp perform some math or modelling in order to arrive at an endpoint distance, or is it simply interpolating from the tables in the EPA's Offsite Consequence Analysis Guidance (OCA Guidance)? RMP*Comp follows the procedures set out in the OCA Guidance. This means that for some scenarios, the endpoint…