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Propping open fire doors is a common violation

Each year, the National Fire Protection Agency (NFPA) reminds employers not to prop open fire doors for convenience. Propping open doors has become a common violation of fire codes after the pandemic because workers didn’t want to become exposed to germs on common touchpoints.

I know firsthand this is an issue at construction jobsites and remember telling workers not to prop open fire doors in our clients’ facilities. Workers were doing this out of convenience because they carried things into and out of the existing facility. Propping open a fire door, or wedging it open, are serious fire and safety hazards. Keep fire doors closed to prevent smoke and fire from spreading into the fire evacuation route, like a stairwell. OSHA and NFPA don’t prohibit propping open a fire exit door but caution employers against doing this for safety and security reasons.

Fire doors must remain closed, although some may be designed to automatically close when fire and smoke are sensed by jobsite fire detection equipment. To reduce the need to disinfect frequently touched points, workers can push open fire doors using their sleeves by pushing against the push bar instead of using their hands. You can also increase housekeeping efforts and the frequency that doorknobs, handles, and push bars are cleaned throughout the shift.

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Most Recent Highlights In Environmental

Are you as focused on combustible dusts as OSHA?
2023-11-30T06:00:00Z

Are you as focused on combustible dusts as OSHA?

If you think you may have combustible dusts lurking in your facilities, you’ll want to know about recent updates to OSHA’s Combustible Dust National Emphasis Program (NEP). Have you been added to the list of higher-likelihood industries?

What are combustible dusts?

Employers are required to inspect their facilities for processes that generate or use combustible dusts and address associated fire, deflagration, and explosion hazards. So, what constitutes combustible dust? Combustible dusts are fine particles that present an explosion hazard when suspended in air under certain conditions.

The following combustible dusts can cause catastrophic loss of life, severe injuries, and building destruction:

  • Metal dust such as aluminum, magnesium, and some forms of iron dusts;
  • Wood dust;
  • Coal and other carbon dusts, including carbon black;
  • Plastic dust, phenolic resins, and additives;
  • Rubber dust;
  • Biosolids;
  • Some textile materials;
  • Organic dust such as sugar, flour, paper, and soap; and
  • Dried blood.

Protecting workers from combustible dusts

Many combustible dust incidents occur without the employer or workers realizing they are in danger. They were either unaware of the potential for dust explosions or failed to recognize the serious nature of dust explosion hazards.

Hazard assessments must be performed to identify all physical and health hazards associated with combustible dusts and ensure Safety Data Sheets (SDSs) list potential exposures and controls. Employers must anticipate types of operations, material use, or downstream material processing that can generate or potentially generate combustible dusts. Operations and uses include:

  • Abrasive blasting;
  • Cutting, grinding, polishing, or crushing of materials;
  • Conveying, mixing, sifting, or screening dry materials; and
  • Building up dried residue from processing wet materials.

How easily particles ignite, or cause explosions, is dependent upon the particle size, shape, moisture content or humidity, and available oxygen. These physical characteristics can change during manufacturing, use, or while the material is being processed. The regulation at 1910.272(j)(2)(ii) requires the removal of any fugitive grain dust accumulations whenever they exceed ⅛ inch (0.32 cm) at priority housekeeping areas or to demonstrate and assure, through the development and implementation of the housekeeping program, that equivalent protection is provided. The thickness of dust must be no more than the thickness of a dime. Essentially, if a footprint can be made in the dust, there’s too much.

What changed with the NEP?

OSHA replaced its March 2008 directive with a revised NEP on January 30, 2023. The NEP added several industries with a higher likelihood of having combustible dust hazards or that have experienced combustible dust-related fatalities/catastrophes. Industries added include:

  • 311812 – Commercial Bakeries
  • 325910 – Printing Ink Manufacturing
  • 321912 – Cut Stock, Resawing Lumber, and Planning
  • 316110 – Leather and Hide Tanning and Finishing
  • 321214 – Truss Manufacturing
  • 424510 – Grain and Field Bean Merchant Wholesalers

Keys to Remember

Too often, employers and workers were unaware of the potential for dust explosions or failed to recognize the serious nature of dust explosion hazards. OSHA has added some industries with a higher likelihood of having combustible dust hazards to the Combustible Dust NEP.

A particulate matter: Stricter emissions limits placed on lead recyclers
2023-11-27T06:00:00Z

A particulate matter: Stricter emissions limits placed on lead recyclers

The Environmental Protection Agency (EPA) published a final rule for New Source Performance Standards (NSPS) for secondary lead smelters, which include facilities that recycle lead-bearing scrap material, typically lead acid batteries. The final rule imposes stricter regulations on particulate matter (PM) emissions and adds testing, recordkeeping, and reporting requirements.

Who’s impacted?

Secondary lead smelters subject to the NSPS that were constructed, reconstructed, or modified after June 11, 1973, and on or before December 1, 2022, are regulated by 40 CFR 60 Subpart L. While PM emissions and opacity standards remain the same, the final rule adds these requirements:

  • Initial performance tests of PM emissions and opacity,
  • Periodic performance tests of PM emissions (every 12 months or every 24 months if conditions are met),
  • Electronic submission of performance tests through EPA’s Central Data Exchange,
  • Monitoring, and
  • Recordkeeping and reporting.

Regulated secondary lead smelters that are constructed, reconstructed, or modified after December 1, 2022, are regulated by the newly added Subpart La, which requires the same additions to Subpart L as well as:

  • Stricter PM emissions and opacity standards that apply at all times (including periods of startup, shutdown, and malfunction),
  • PM standards for all process fugitive emission sources, and
  • Periodic performance tests of opacity.

EPA also added Method 22 as an alternative for showing compliance with opacity standards in efforts to reduce testing burdens.

2023-11-24T06:00:00Z

EPA: Decabromodiphenyl Ether and Phenol, Isopropylated Phosphate (3:1); Revision to the Regulation of Persistent, Bioaccumulative, and Toxic Chemicals Under the Toxic Substances Control Act (TSCA)

SUMMARY: The Environmental Protection Agency (EPA) is proposing revisions to the regulations for decabromodiphenyl ether (decaBDE) and phenol, isopropylated phosphate (3:1) (PIP (3:1)), two of the five persistent, bioaccumulative, and toxic (PBT) chemicals addressed in final rules issued under the Toxic Substances Control Act (TSCA) in January 2021. After receiving additional comments following the issuance of the 2021 PBT final rules, the Agency has determined that revisions to the decaBDE and PIP (3:1) regulations are necessary to address implementation issues and to reduce further exposures. As required under TSCA, these proposed requirements would, if finalized, reduce the potential for exposures to humans and the environment to decaBDE and PIP (3:1) to the extent practicable. The Agency is not proposing to revise the existing regulations for the other three PBT chemicals (2,4,6-TTBP, HCBD, and PCTP) at this time.

DATES: This proposed rule is published in the Federal Register November 24, 2023, page 82287.

View proposed rule.

2023-11-20T06:00:00Z

EPA: New Source Performance Standards Review for Secondary Lead Smelters

SUMMARY: The Environmental Protection Agency (EPA) is finalizing amendments to the new source performance standards (NSPS) for secondary lead smelters pursuant to the periodic review required by the Clean Air Act (CAA). Specifically, the EPA is finalizing revisions to the NSPS that applies to affected secondary lead smelters constructed, reconstructed, or modified after December 1, 2022 (NSPS subpart La). The EPA is also finalizing amendments to the NSPS for secondary lead smelters constructed, reconstructed, or modified after June 11, 1973, and on or before December 1, 2022, (NSPS subpart L). In addition, we are finalizing the use of EPA Method 22 (Visual Determination of Fugitive Emissions from Material Sources and Smoke Emissions from Flares) as an alternative for demonstrating compliance with the opacity limit.

DATES: This final rule is effective on November 20, 2023, published in the Federal Register November 20, 2023, page 80594.

View final rule.

§60.17 Incorporations by reference.
(h)(206)RevisedView text
(j)(2)RevisedView text
Subpart L - Standards of Performance for Secondary Lead Smelters for Which Construction, Reconstruction, or Modification Commenced After June 11, 1973, and On or Before December 1, 2022
Subpart headingRevised View text
§60.120 Applicability and designation of affected facility.
(b)Revised View text
§60.122 Standard for particulate matter.
(a)(1)Revised View text
§60.123 Test methods and procedures.
Entire sectionRevised View text
§60.124 Monitoring requirements.
Entire sectionAddedView text
§60.125 Notification, recordkeeping, and reporting requirements.
Entire sectionAddedView text
Subpart La—Standards of Performance for Secondary Lead Smelters for Which Construction, Reconstruction, or Modification Commenced After December 1, 2022
Entire subpartAddedView text

View Text

§60.17 Incorporations by reference.

* * * * *

(h) * * *

(206) ASTM D7520–16, Standard Test Method for Determining the Opacity of a Plume in the Outdoor Ambient Atmosphere, approved April 1, 2016; IBR approved for §§60.271(k); and (b); 60.273(c) and (d); 60.274(h); 60.275(e); 60.276(c); 60.271a; 60.272a(a) and (b); 60.273a(c) and (d); 60.274a(h); 60.275a(e); 60.276a(f); 60.271b; 60.272b(a) and (b); 60.273b(c) and (d); 60.274b(h); 60.275b(e); 60.276b(f); 60.374a(d).

* * * * *

(j) * * *

(2) EPA–454/R–98–015, Office of Air Quality Planning and Standards (OAQPS), Fabric Filter Bag Leak Detection Guidance, September 1997, https://nepis.epa.gov/Exe/ZyPDF.cgi?Dockey=2000D5T6.PDF; IBR approved for §§60.273(e); 60.273a(e); 60.273b(e); 60.373a(b); 60.2145(r); 60.2710(r); 60.4905(b); 60.5225(b).

* * * * *

Subpart L - Standards of Performance for Secondary Lead Smelters

§60.120 Applicability and designation of affected facility.

* * * * *

(b) Any facility under paragraph (a) of this section that commences construction or modification after June 11, 1973, is subject to the requirements of this subpart.

§60.122 Standard for particulate matter.

(a) * * *

(1) Contain particulate matter in excess of 50 mg/dscm (0.022 gr/dscf).

* * * * *

§60.123 Test methods and procedures.

(a) In conducting the performance tests required in §60.8, the owner or operator shall use as reference methods and procedures the test methods in appendix A of this part or other methods and procedures as specified in this section, except as provided in §60.8(b).

(b) The owner or operator shall determine compliance with the particulate matter standards in §60.122 as follows:

(1) Method 5 shall be used to determine the particulate matter concentration during representative periods of furnace operation, including charging and tapping. The sampling time and sample volume for each run shall be at least 60 minutes and 0.90 dscm (31.8 dscf).

(2) Method 9 and the procedures in §60.11 shall be used to determine opacity.

2023-11-16T06:00:00Z

EPA: National Emission Standards for Hazardous Air Pollutants: Rubber Tire Manufacturing

SUMMARY: The U.S. Environmental Protection Agency (EPA) is proposing amendments to the National Emission Standards for Hazardous Air Pollutants for Rubber Tire Manufacturing, as required by the Clean Air Act (CAA). To ensure that all emissions of hazardous air pollutants (HAP) from sources in the source category are regulated, the EPA is proposing emissions standards for the rubber processing subcategory of the rubber tire manufacturing industry, which is the only unregulated subcategory within the Rubber Tire Manufacturing source category.

DATES: Comments must be receive on or before January 2, 2024. Published in the Federal Register November 16, 2023, page 78692.

View proposed rule.

See More

Most Recent Highlights In Transportation

Are workers using the right respirator and cartridge?
2023-11-16T06:00:00Z

Are workers using the right respirator and cartridge?

OSHA requires employers to provide each worker with respiratory protection when such equipment is necessary to protect the worker’s health. Employers are required by 29 CFR 1910.134 to provide respirators that are applicable and suitable for the purpose intended. The employer must also establish and maintain a respiratory protection program that identifies respiratory hazards, controls, and proper personal protective equipment selection and use.

Respirators protect workers against insufficient oxygen, harmful dusts, smoke, gases, and vapors. These hazards may cause cancer, lung diseases, or even death. Without the correct respirator and corresponding cartridge, workers are at risk of exposure.

Does the type of respirator and cartridge really matter?

Respirators protect workers in two ways — by removing contaminants from the air or by supplying clean air to the user. Particulate respirators filter out airborne particles, while air-purifying respirators (APRs) with cartridges filter out chemicals and gases. Atmosphere-supplying respirators (ASRs provide air and include airline respirators, which use compressed air from a remote source, and self-contained breathing apparatus (SCBA), which contain their own air supply.

Each type of respirator has an assigned protection factor (APF) that indicates the level of protection expected from the respirator. APRs use filters, cartridges, or canisters to remove contaminants such as dusts, gases, vapors, and aerosols from the air. The cartridges or canisters have a filter, sorbent, catalyst, or combination of these items that removes specific contaminants from air that passes through the container. Per 1910.134(d)(3)(i)(A), employers are required to assign protection factors based on Table 1 in the standard.

Both the proper type and the service life of the cartridge are paramount. Respirators and cartridges must meet or exceed the required level of worker protection. Employers must ensure APFs are appropriate to the operation or task for which respirators are used.

Types of respirator cartridges

Employers and workers should always refer to container labels and safety data sheets (SDSs to determine the proper respiratory protection for each task. NIOSH-approved respirator cartridges are designated by color coding:

  • Black — used for organic vapors (OV)
  • Black/magenta (black/purple) — used for OV and high efficiency (HE) filter, P100 filters
  • Olive-brown — used for OV, acid gases, and ammonia
  • Olive-brown/magenta (olive-brown/purple) — used for OV, ammonia, acid gases, and HE filter, P100 filters
  • Magenta (purple) — used for HE filter, P100 filters
  • Yellow — used for OVs and acid gases
  • Yellow/magenta (yellow/purple) — used for OV, acid gases, and HE filter, P100 filters
  • White — used for acid gases
  • Bright green — used for ammonia

End of service life

Each respirator cartridge will have an end-of-service-life indicator (ESLI) warning the respirator user that the end of adequate respiratory protection is near. For example, the sorbent is approaching saturation or is no longer effective. Workers who use cartridges or canisters beyond the ESLI are placing themselves in harm’s way.

Keys to Remember

OSHA’s Respiratory Protection standard requires employers to protect workers from insufficient oxygen, harmful dusts, smoke, gases, and vapors. Respirators and corresponding cartridges must be of proper type and condition to ensure protection appropriate to the operation or task for which they’re used.

2023-11-08T06:00:00Z

EPA: Locomotives and Locomotive Engines; Preemption of State and Local Regulations

SUMMARY: The Environmental Protection Agency (EPA) is finalizing revisions to its regulations addressing preemption of State and local regulation of locomotives and engines used in locomotives. This rule implements a policy change to no longer categorically preempt certain State regulations of non-new locomotives and engines, aligning with the plain text of the Clean Air Act (CAA), and better achieving the legislative intent of providing for exclusive Federal regulation of new locomotives and new locomotive engines while preserving the ability of California and other States to adopt and enforce certain State standards regulating non-new locomotives and engines.

DATES: This final rule is effective on December 8, 2023, published in the Federal Register November 8, 2023, page 77004.

§1074.10 Scope of preemption.
(b) RevisedView text
(c)AddedView text
§1074.12 Scope of preemption-specific provisions for locomotives and locomotive engines
Entire sectionRemoved View text
§1074.101 Procedures for California nonroad authorization requests.
(a)RevisedView text

Previous Text

§1074.10 Scope of preemption.

* * * *

(b) For nonroad engines or vehicles other than those described in paragraph (a) of this section and §1074.12, States and localities are preempted from enforcing any standards or other requirements relating to control of emissions from nonroad engines or vehicles except as provided in subpart B of this part.

* * * *

§1074.101 Procedures for California nonroad authorization requests.

(a) California must request authorization from the Administrator to enforce its adopted standards and other requirements relating to control of emissions from nonroad engines or vehicles that are not preempted by §1074.10(a) or §1074.12. The request must include the record on which the state rulemaking was based.

* * * *

2023-10-31T05:00:00Z

EPA: Trichloroethylene (TCE); Regulation under the Toxic Substances Control Act (TSCA)

SUMMARY: The Environmental Protection Agency (EPA) is proposing to address the unreasonable risk of injury to human health presented by trichloroethylene (TCE) under its conditions of use as documented in EPA's November 2020 Risk Evaluation for TCE and January 2023 revised risk determination for TCE pursuant to the Toxic Substances Control Act (TSCA). TCE is widely used as a solvent in a variety of industrial, commercial and consumer applications including for hydrofluorocarbon (HFC) production, vapor and aerosol degreasing, and in lubricants, greases, adhesives, and sealants. TSCA requires that when EPA determines a chemical substance presents unreasonable risk that EPA address by rule the unreasonable risk of injury to health or the environment and apply requirements to the extent necessary so the chemical no longer presents unreasonable risk. EPA determined that TCE presents an unreasonable risk of injury to health due to the significant adverse health effects associated with exposure to TCE, including non-cancer effects (liver toxicity, kidney toxicity, neurotoxicity, immunotoxicity, reproductive toxicity, and developmental toxicity) as well as cancer (liver, kidney, and non-Hodgkin lymphoma) from chronic inhalation and dermal exposures to TCE. TCE is a neurotoxicant and is carcinogenic to humans by all routes of exposure. The most sensitive adverse effects of TCE exposure are non-cancer effects (developmental toxicity and immunosuppression) for acute exposures and developmental toxicity and autoimmunity for chronic exposures. To address the identified unreasonable risk, EPA is proposing to: prohibit all manufacture (including import), processing, and distribution in commerce of TCE and industrial and commercial use of TCE for all uses, with longer compliance timeframes and workplace controls for certain processing and industrial and commercial uses (including proposed phaseouts and time-limited exemptions); prohibit the disposal of TCE to industrial pre-treatment, industrial treatment, or publicly owned treatment works, with a time-limited exemption for cleanup projects; and establish recordkeeping and downstream notification requirements.

DATES: Comments must be received on or before December 15, 2023, published in the Federal Register October 31, 2023, page 74712.

View proposed rule.

2023-10-31T05:00:00Z

EPA: Changes to Reporting Requirements for Per- and Polyfluoroalkyl Substances and to Supplier Notifications for Chemicals of Special Concern; Community Right-to-Know Toxic Chemical Release Reporting

SUMMARY: The Environmental Protection Agency (EPA) is adding per- and polyfluoroalkyl substances (PFAS) subject to reporting under the Emergency Planning and Community Right-to-Know Act (EPCRA) and the Pollution Prevention Act (PPA) pursuant to the National Defense Authorization Act for Fiscal Year 2020 (NDAA) to the list of Lower Thresholds for Chemicals of Special Concern (chemicals of special concern). These PFAS already have a lower reporting activity threshold of 100 pounds. The addition of these PFAS to the list of chemicals of special concern means such PFAS are subject to the same reporting requirements as other chemicals of special concern ( i.e., it eliminates the use of the de minimis exemption and the option to use Form A and would limit the use of range reporting for PFAS). Removing the availability of these burden-reduction reporting options will result in a more complete picture of the releases and waste management quantities for these PFAS. EPA is removing the availability of the de minimis exemption for purposes of the Supplier Notification Requirements for all chemicals on the list of chemicals of special concern. This will help ensure that purchasers of mixtures and trade name products containing such chemicals are informed of their presence in mixtures and products they purchase to better inform any TRI reporting obligations.

DATES: This final rule is effective November 30, 2023 and shall apply for the reporting year beginning January 1, 2024 (reports due July 1, 2025), published in the Federal Register October 31, 2023, page 74360.

View final rule

§372.22 Covered facilities for toxic chemical release reporting.
(c)RevisedView text
§372.25 Thresholds for reporting.
Introductory textRevisedView text
(f)-(h)RevisedView text
§372.28 Lower thresholds for chemicals of special concern.
Table 1 to paragraph (a)(1); entry “Per- and polyfluoroalkyl substances”AddedView text
§372.29 Thresholds for per- and polyfluoroalkyl substances.
Entire sectionRemovedView text
§372.30 Reporting requirements and schedule for reporting.
(a)-(b)RevisedView text
§372.38 Exemptions.
(a)(2)RevisedView text
(b)-(d), (f)-(h)RevisedView text
§372.45 Notification about toxic chemicals.
(d)(1)RevisedView text

Previous Text

§372.22 Covered facilities for toxic chemical release reporting.

* * * *

(c) The facility manufactured (including imported), processed, or otherwise used a toxic chemical in excess of an applicable threshold quantity of that chemical set forth in §372.25, §372.27, §372.28, or §372.29.

§372.25 Thresholds for reporting.

Except as provided in §372.27, 372.28, and 372.29, the threshold amounts for purposes of reporting under §372.30 for toxic chemicals are as follows:

* * * *

(f) A toxic chemical may be listed in §372.65 with the notation that only persons who manufacture the chemical, or manufacture it by a certain method, are required to report. In that case, only owners or operators of facilities that manufacture that chemical as described in §372.65 in excess of the threshold applicable to such manufacture in §372.27, §372.28, or§372.29 or are required to report. In completing the reporting form, the owner or operator is only required to account for the quantity of the chemical so manufactured and releases associated with such manufacturing, but not releases associated with subsequent processing or use of the chemical at that facility. Owners and operators of facilities that solely process or use such a chemical are not required to report for that chemical.

(g) A toxic chemical may be listed in §372.65 with the notation that it is in a specific form (e.g., fume or dust, solution, or friable) or of a specific color (e.g., yellow or white). In that case, only owners or operators of facilities that manufacture, process, or use that chemical in the form or of the color, specified in §372.65 in excess of the threshold applicable to such activity in §372.27, §372.28, or§372.29 are required to report. In completing the reporting form, the owner or operator is only required to account for the quantity of the chemical manufactured, processed, or used in the form or color specified in §372.65 and for releases associated with the chemical in that form or color. Owners or operators of facilities that solely manufacture, process, or use such a chemical in a form or color other than those specified by §372.65 are not required to report for that chemical.

(h) Metal compound categories are listed in §372.65(c) . For purposes of determining whether any of the thresholds specified in §372.27, §372.28, or§372.29 are met for metal compound category, the owner or operator of a facility must make the threshold determination based on the total amount of all members of the metal compound category manufactured, processed, or used at the facility. In completing the release portion of the reporting form for releases of the metal compounds, the owner or operator is only required to account for the weight of the parent metal released. Any contribution to the mass of the release attributable to other portions of each compound in the category is excluded.

§372.30 Reporting requirements and schedule for reporting.

(a) For each toxic chemical known by the owner or operator to be manufactured (including imported), processed, or otherwise used in excess of an applicable threshold quantity in §372.25, §372.27, §372.28, or §372.29 at its covered facility described in §372.22 for a calendar year, the owner or operator must submit to EPA and to the State in which the facility is located a completed EPA Form R (EPA Form 9350-1), EPA Form A (EPA Form 9350-2), and, for the dioxin and dioxin-like compounds category, EPA Form R Schedule 1 (EPA Form 9350-3) in accordance with the instructions referred to in subpart E of this part. If the covered facility is located in Indian country, the facility shall submit (to the extent applicable) a completed EPA Form R, Form A, and Form R Schedule 1 as described above to EPA and to the official designated by the Tribal Chairperson or equivalent elected official of the relevant Indian Tribe, instead of to the State.

(b)(1) The owner or operator of a covered facility is required to report as described in paragraph (a) of this section on a toxic chemical that the owner or operator knows is present as a component of a mixture or trade name product which the owner or operator receives from another person, if that chemical is imported, processed, or otherwise used by the owner or operator in excess of an applicable threshold quantity in §372.25, §372.27, §372.28, or §372.29 at the facility as part of that mixture or trade name product.

(2) The owner or operator knows that a toxic chemical is present as a component of a mixture or trade name product (i) if the owner or operator knows or has been told the chemical identity or Chemical Abstracts Service Registry Number of the chemical and the identity or Number corresponds to an identity or Number in §372.65 , or (ii) if the owner or operator has been told by the supplier of the mixture or trade name product that the mixture or trade name product contains a toxic chemical subject to section 313 of the Act or this part.

(3) To determine whether a toxic chemical which is a component of a mixture or trade name product has been imported, processed, or otherwise used in excess of an applicable threshold in §372.25, §372.27, §372.28, or §372.29 at the facility, the owner or operator shall consider only the portion of the mixture or trade name product that consists of the toxic chemical and that is imported, processed, or otherwise used at the facility, together with any other amounts of the same toxic chemical that the owner or operator manufactures, imports, processes, or otherwise uses at the facility as follows:

(i) If the owner or operator knows the specific chemical identity of the toxic chemical and the specific concentration at which it is present in the mixture or trade name product, the owner or operator shall determine the weight of the chemical imported, processed, or otherwise used as part of the mixture or trade name product at the facility and shall combine that with the weight of the toxic chemical manufactured (including imported), processed, or otherwise used at the facility other than as part of the mixture or trade name product. After combining these amounts, if the owner or operator determines that the toxic chemical was manufactured, processed, or otherwise used in excess of an applicable threshold in §372.25, §372.27, §372.28, or §372.29, the owner or operator shall report the specific chemical identity and all releases of the toxic chemical on EPA Form R in accordance with the instructions referred to in subpart E of this part.

(ii) If the owner or operator knows the specific chemical identity of the toxic chemical and does not know the specific concentration at which the chemical is present in the mixture or trade name product, but has been told the upper bound concentration of the chemical in the mixture or trade name product, the owner or operator shall assume that the toxic chemical is present in the mixture or trade name product at the upper bound concentration, shall determine whether the chemical has been manufactured, processed, or otherwise used at the facility in excess of an applicable threshold as provided in paragraph (b)(3)(i) of this section, and shall report as provided in paragraph (b)(3)(i) of this section.

(iii) If the owner or operator knows the specific chemical identity of the toxic chemical, does not know the specific concentration at which the chemical is present in the mixture or trade name product, has not been told the upper bound concentration of the chemical in the mixture or trade name product, and has not otherwise developed information on the composition of the chemical in the mixture or trade name product, then the owner or operator is not required to factor that chemical in that mixture or trade name product into threshold and release calculations for that chemical.

(iv) If the owner or operator has been told that a mixture or trade name product contains a toxic chemical, does not know the specific chemical identity of the chemical andknows the specific concentration at which it is present in the mixture or trade name product, the owner or operator shall determine the weight of the chemical imported, processed, or otherwise used as part of the mixture or trade name product at the facility. Since the owner or operator does not know the specific identity of the toxic chemical, the owner or operator shall make the threshold determination only for the weight of the toxic chemical in the mixture or trade name product. If the owner or operator determines that the toxic chemical was imported, processed, or otherwise used as part of the mixture or trade name product in excess of an applicable threshold in §372.25, §372.27, §372.28, or §372.29, the owner or operator shall report the generic chemical name of the toxic chemical, or a trade name if the generic chemical name is not known, and all releases of the toxic chemical on EPA Form R in accordance with the instructions referred to in subpart E of this part.

(v) If the owner or operator has been told that a mixture or trade name product contains a toxic chemical, does not know the specific chemical identity of the chemical, and does not know the specific concentration at which the chemical is present in the mixture or trade name product, but has been told the upper bound concentration of the chemical in the mixture or trade name product, the owner or operator shall assume that the toxic chemical is present in the mixture or trade name product at the upper bound concentration, shall determine whether the chemical has been imported, processed, or otherwise used at the facility in excess of an applicable threshold as provided in paragraph (b)(3)(iv) of this section, and shall report as provided in paragraph (b)(3)(iv) of this section.

(vi) If the owner or operator has been told that a mixture or trade name product contains a toxic chemical, does not know the specific chemical identity of the chemical, does not know the specific concentration at which the chemical is present in the mixture or trade name product, including information they have themselves developed, and has not been told the upper bound concentration of the chemical in the mixture or trade name product, the owner or operator is not required to report with respect to that toxic chemical.

§372.38 Exemptions.

* * * *

(a)(2) The exemption in this paragraph (a) applies whether the person received the mixture from another person, or the person produced the mixture, either by mixing the chemicals involved or by causing a chemical reaction which resulted in the creation of the toxic chemical in the mixture. However, this exemption applies only to the quantity of the toxic chemical present in the mixture. If the toxic chemical is also manufactured (including imported), processed, or otherwise used at the covered facility other than as part of the mixture or in a mixture at higher concentrations, in excess of an applicable threshold quantity set forth in §372.25, the person is required to report under §372.30. This exemption does not apply to toxic chemicals listed in §372.28, except for purposes of §372.45(d)(1).

(b) Articles. If a toxic chemical is present in an article at a covered facility, a person is not required to consider the quantity of the toxic chemical present in such article when determining whether an applicable threshold has been met under §372.25, §372.27, §372.28, or §372.29 or determining the amount of release to be reported under §372.30 . This exemption applies whether the person received the article from another person or the person produced the article. However, this exemption applies only to the quantity of the toxic chemical present in the article. If the toxic chemical is manufactured (including imported), processed, or otherwise used at the covered facility other than as part of the article, in excess of an applicable threshold quantity set forth in §372.25, §372.27, §372.28, or §372.29, the person is required to report under §372.30 . Persons potentially subject to this exemption should carefully review the definitions of "article" and "release" in §372.3 . If a release of a toxic chemical occurs as a result of the processing or use of an item at the facility, that item does not meet the definition of "article."

(c) Uses. If a toxic chemical is used at a covered facility for a purpose described in this paragraph (c) , a person is not required to consider the quantity of the toxic chemical used for such purpose when determining whether an applicable threshold has been met under §372.25, §372.27, §372.28, or §372.29 or determining the amount of releases to be reported under §372.30 . However, this exemption only applies to the quantity of the toxic chemical used for the purpose described in this paragraph (c) . If the toxic chemical is also manufactured (including imported), processed, or otherwise used at the covered facility other than as described in this paragraph (c) , in excess of an applicable threshold quantity set forth in §372.25, §372.27, §372.28, or §372.29, the person is required to report under §372.30 .

(1) Use as a structural component of the facility.

(2) Use of products for routine janitorial or facility grounds maintenance. Examples include use of janitorial cleaning supplies, fertilizers, and pesticides similar in type or concentration to consumer products.

(3) Personal use by employees or other persons at the facility of foods, drugs, cosmetics, or other personal items containing toxic chemicals, including supplies of such products within the facility such as in a facility operated cafeteria, store, or infirmary.

(4) Use of products containing toxic chemicals for the purpose of maintaining motor vehicles operated by the facility.

(5) Use of toxic chemicals present in process water and non-contact cooling water as drawn from the environment or from municipal sources, or toxic chemicals present in air used either as compressed air or as part of combustion.

(d) Activities in laboratories. If a toxic chemical is manufactured, processed, or used in a laboratory at a covered facility under the supervision of a technically qualified individual as defined in §720.3(ee) of this title, a person is not required to consider the quantity so manufactured, processed, or used when determining whether an applicable threshold has been met under §372.25, §372.27, §372.28, or §372.29 or determining the amount of release to be reported under §372.30 . This exemption does not apply in the following cases:

(1) Specialty chemical production.

(2) Manufacture, processing, or use of toxic chemicals in pilot plant scale operations.

(3) Activities conducted outside the laboratory.

(e) Certain owners of leased property. The owner of a covered facility is not subject to reporting under §372.30 if such owner's only interest in the facility is ownership of the real estate upon which the facility is operated. This exemption applies to owners of facilities such as industrial parks, all or part of which are leased to persons who operate establishments in any SIC code or NAICS code in §372.23 that is subject to the requirements of this part, where the owner has no other business interest in the operation of the covered facility.

(f) Reporting by certain operators of establishments on leased property such as industrial parks. If two or more persons, who do not have any common corporate or business interest (including common ownership or control), operate separate establishments within a single facility, each such person shall treat the establishments it operates as a facility for purposes of this part. The determinations in §372.22 and §372.25, §372.27, §372.28, or §372.29 shall be made for those establishments. If any such operator determines that its establishment is a covered facility under §372.22 and that a toxic chemical has been manufactured (including imported), processed, or otherwise used at the establishment in excess of an applicable threshold in §372.25, §372.27, §372.28, or §372.29 for a calendar year, the operator shall submit a report in accordance with §372.30 for the establishment. For purposes of this paragraph (f), a common corporate or business interest includes ownership, partnership, joint ventures, ownership of a controlling interest in one person by the other, or ownership of a controlling interest in both persons by a third person.

(g) Coal extraction activities . If a toxic chemical is manufactured, processed, or otherwise used in extraction by facilities in SIC code 12, or in NAICS codes 212111, 212112 or 212113, a person is not required to consider the quantity of the toxic chemical so manufactured, processed, or otherwise used when determining whether an applicable threshold has been met under §372.25, §372.27, §372.28, or §372.29, or determining the amounts to be reported under §372.30.

(h) Metal mining overburden . If a toxic chemical that is a constituent of overburden is processed or otherwise used by facilities in SIC code 10, or in NAICS codes 212221, 212222, 212230 or 212299, a person is not required to consider the quantity of the toxic chemical so processed, or otherwise used when determining whether an applicable threshold has been met under §372.25, §372.27, §372.28, or §372.29, or determining the amounts to be reported under §372.30.

§372.45 Notification about toxic chemicals.

* * * *

(d)(1) If a mixture or trade name product contains no toxic chemical in excess of the applicable de minimis concentration as specified in §372.38(a) .

EPA deletes de minimis exemption for TRI-listed PFAS
2023-10-31T05:00:00Z

EPA deletes de minimis exemption for TRI-listed PFAS

The Environmental Protection Agency (EPA) finalized a rule impacting all reporting facilities that manufacture, process, or otherwise use per- and polyfluoroalkyl substances (PFAS) subject to Toxics Release Inventory (TRI) reporting (listed at 40 CFR 372.65). The agency is:

  • Designating all TRI-listed PFAS as “chemicals of special concern,” and
  • Removing the de minimis exemption for supplier notification requirements to downstream facilities for all chemicals on the list of chemicals of special concern.

Impact on reporting entities

The final rule categorizes all PFAS on the TRI as chemicals of special concern. This action:

  • Eliminates the de minimis exemption, which allowed facilities to avoid reporting information on PFAS that were used in small (de minimis) quantities (below the 100-pound threshold);
  • Removes eligibility to use reporting Form A, which simplified reporting for facilities that didn’t exceed the thresholds for the total annual reportable amount of PFAS (500 pounds) and for the amounts of PFAS manufactured, processed, or used (1 million pounds); and
  • Limits range reporting for PFAS.

Reporting facilities will now be required to report all quantities of PFAS they manage or release into the environment.

Additionally, EPA eliminated the de minimis exemption for the supplier notification requirements (at 372.45) to downstream facilities for facilities that manufacture or process any chemical on the list of chemicals of special concern. Previously, suppliers weren’t required to notify product users of certain chemicals present in mixtures if their concentrations were less than 1 percent (less than 0.1 percent for carcinogens). Suppliers will now be required to notify users of any amount of a chemical of special concern contained in the mixture.

Future PFAS added to TRI

The final rule also stipulates that when PFAS are added to the TRI in the future, they will also be added to the list of chemicals of special concern on the same date. This helps EPA avoid delays in reporting requirements since the 100-pound reporting threshold for PFAS will remain in the regulations.

The final rule’s changes take effect for the reporting year beginning on January 1, 2024. The annual TRI reports for 2024 are due to EPA on July 1, 2025.

Key to remember: EPA’s recent final rule requires covered facilities to include all quantities of PFAS on their TRI reports and mandates that suppliers notify product users of the presence of any chemicals of special concern contained in the mixture or product.

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2023-10-30T05:00:00Z

EPA: Procedures for Chemical Risk Evaluation Under the Toxic Substances Control Act (TSCA)

SUMMARY: The Environmental Protection Agency (EPA, “the Agency”) is proposing to amend the procedural framework rule for conducting risk evaluations under the Toxic Substances Control Act (TSCA). The purpose of risk evaluations under TSCA is to determine whether a chemical substance presents an unreasonable risk of injury to health or the environment, without consideration of costs or non-risk factors, including unreasonable risk to potentially exposed or susceptible subpopulations identified as relevant to the risk evaluation by EPA, under the conditions of use. EPA has reconsidered the procedural framework rule for conducting such risk evaluations and determined that certain aspects of that framework should be revised to better align with applicable court decisions and the statutory text, to reflect the Agency's experience implementing the risk evaluation program following enactment of the 2016 TSCA amendments, and to allow for consideration of future scientific advances in the risk evaluation process without need to further amend the Agency's procedural rule.

DATES: Comments must be received on or before December 14, 2023, published in the Federal Register October 30, 2023, page 74292.

View proposed rule.

EHS Monthly Roundup - March 2023

EHS Monthly Roundup - March 2023

This monthly video spotlights EHS news highlights from March 2023.

Hi everyone! Welcome to the monthly news roundup video, where we’ll review the most impactful environmental, health, and safety news. Please view the content links in the transcript to take a deeper dive into the topics I’ll be covering today. With that said, let’s get started!

First, let’s take a look at what’s happening in safety and health. OSHA revised its combustible dust national emphasis program. It adds several industries with a higher likelihood of having combustible dust hazards.

California’s Safety and Health Appeals Board says drinking water must be “as close as practicable” to outdoor employees.

The Pipeline and Hazardous Materials Safety Administration says that some forklift operators may be considered hazmat employees. If operators handle hazmat cargo, such as moving it from the truck to an aircraft, they need hazmat training.

OSHA posted a letter of interpretation that answers hazard communication questions related to lithium batteries. The agency says workers may be exposed to hazards during storage, handling, and maintenance activities.

Stand Up 4 Grain Safety Week was held the week of March 27. Employers were encouraged to hold toolbox talks or safety demonstrations related to grain handling and storage.

Turning to environmental news, EPA issued significant new use rules for chemical substances that were the subject of premanufacture notices. This change brings added reporting and recordkeeping.

Thanks for tuning in to the monthly news roundup. We’ll see you next month!

EHS Monthly Roundup - February 2023

EHS Monthly Roundup - February 2023

This monthly video spotlights EHS news highlights from February 2023.

Hi everyone! Welcome to the monthly roundup video, where we’ll review the most impactful environmental, safety, and health news.

First, let’s take a look at what’s happening in safety and health. Machine guarding and hazard communication topped OSHA’s list of most frequently cited serious violations in fiscal year 2022. Over 1,300 citations were issued for machine guarding and over 1,800 were issued for HazCom.

Effective March 26, OSHA will cite certain types of violations as “instance-by-instance” citations, when inspectors identify high-gravity, serious violations specific to the following: falls, trenching, machine guarding, respiratory protection, permit required confined space, and lockout/tagout, as well as other-than-serious violations specific to recordkeeping.

California’s COVID-19 prevention non-emergency regulations, which require employers to protect workers from the hazards related to COVID-19, took effect February 3, and will remain in effect for two years.

A new OSHA fact sheet outlines measures to protect shipyard employees from the physical hazards of confined spaces. In the maritime sector, physical hazards in confined spaces can increase a worker’s risk of injury.

OSHA says it will withdraw its proposal to revoke Arizona’s State Plan. The state has taken measures to remain compliant with federal OSHA. However, OSHA continues to work closely with Arizona to address other state-plan concerns that weren’t part of its original withdrawal proposal.

And turning to environmental news, EPA issued a rule that finalizes first-time standards for inorganic hazardous air pollutants in miscellaneous coating manufacturing that will limit emissions and require effective controls. Final amendments include provisions for inorganic hazardous air pollutant standards for process vessels. The rule took effect February 22.

Thanks for tuning in to the monthly news roundup. We'll see you next month!

2023-10-24T05:00:00Z

EPA: Phasedown of Hydrofluorocarbons: Restrictions on the Use of Certain Hydrofluorocarbons Under the American Innovation and Manufacturing Act of 2020

SUMMARY: The U.S. Environmental Protection Agency is issuing regulations to implement certain provisions of the American Innovation and Manufacturing Act, as enacted on December 27, 2020. This rulemaking restricts the use of hydrofluorocarbons in specific sectors or subsectors in which they are used; establishes a process for submitting technology transitions petitions; establishes recordkeeping and reporting requirements; and addresses certain other elements related to the effective implementation of the American Innovation and Manufacturing Act. These restrictions on the use of hydrofluorocarbons address petitions granted on October 7, 2021, and September 19, 2022.

DATES: This rule is effective December 26, 2023, published in the Federal Register October 24, 2023, page 73098.

View final rule.

Part 84—Phasedown of Hydrofluorocarbons
Subpart B—Restrictions on the Use of HydrofluorocarbonsAddedView text
2023-10-23T05:00:00Z

EPA: Guideline on Air Quality Models; Enhancements to the AERMOD Dispersion Modeling System

SUMMARY: In this action, the Environmental Protection Agency (EPA) proposes to revise the Guideline on Air Quality Models (“Guideline”). The Guideline has been incorporated into EPA's regulations, satisfying a requirement under the Clean Air Act (CAA) section 165(e)(3)(D) for the EPA to specify, with reasonable particularity, models to be used in the Prevention of Significant Deterioration (PSD) program. It provides EPA-preferred models and other recommended techniques, as well as guidance for their use in predicting ambient concentrations of air pollutants. In this action, the EPA is proposing revisions to the Guideline, including enhancements to the formulation and application of the EPA's near-field dispersion modeling system, AERMOD, and updates to the recommendations for the development of appropriate background concentration for cumulative impact analyses. Within this action, the EPA is also announcing the Thirteenth Conference on Air Quality Modeling and invites the public to participate in the conference. The conference will focus on the proposed revisions to the Guideline, and part of the conference will also serve as the public hearing for these revisions.

DATES: This proposed rule is published in the Federal Register October 23, 2023, page 72826.

View proposed rule.

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Most Recent Highlights In Human Resources

2023-10-19T05:00:00Z

EPA: Phasedown of Hydrofluorocarbons: Management of Certain Hydrofluorocarbons and Substitutes under Subsection (h) of the American Innovation and Manufacturing Act of 2020

SUMMARY: The U.S. Environmental Protection Agency is proposing to issue regulations to implement certain provisions of the American Innovation and Manufacturing Act of 2020. This rulemaking proposes to establish a program for the management of hydrofluorocarbons that includes requirements for leak repair and use of automatic leak detection systems for certain equipment using refrigerants containing hydrofluorocarbons and certain substitutes; requirements for the use of reclaimed hydrofluorocarbons in certain sectors or subsectors; the use of recycled hydrofluorocarbons in fire suppression equipment; recovery of hydrofluorocarbons from cylinders; container tracking; and certain recordkeeping, reporting, and labeling requirements. The Environmental Protection Agency is also proposing alternative Resource Conservation and Recovery Act standards for spent ignitable refrigerants being recycled for reuse. Finally, EPA requests advance comment on approaches for establishing requirements for technician training and/or certification.

DATES: Comments on this notice of proposed rulemaking must be received on or before December 18, 2023, published in the Federal Register October 19, 2023, page 72216.

View proposed rule.

EntertainmentProfessional ServicesPersonal ServicesRepair ServicesConstructionUtilitiesWaste ManagementPublic AdministrationWholesale DistributionWarehousingManufacturing (32/Non-Durable)Manufacturing (31/Food/Textiles)TransportationMiningReal EstateRetailManufacturing (33/Durable)HealthcareHazardous MaterialsToxic ChemicalsConditionally Excluded WasteReceiving FacilitiesNational Contingency PlanLQGsPost-ClosureU CodesSmall Quantity GeneratorsHazardous ChemicalsEPA ID NumbersException ReportingICPsWaste DisposalNational Response SystemExtremely Hazardous SubstancesIntegrated Contingency PlansMunicipal Solid WasteToxic SubstancesCorrosivityForm 8700-12ToxicityAerosol CansNCPBlasting AgentsBiennial ReportingReactivityShop RagsRCRAEmergency Response InformationBoilersERIRecyclingPackagesWaste TreatmentWaste BurnersNon-Bulk PackagingsChemical ListsBulk PackagingsTSDFsConditionally ExemptHHCInterim StatusHazardous Secondary MaterialsResiduesVery Small Quantity GeneratorsOily RagsEmergency CoordinatorsP CodesAcute WasteUsed BatteriesCRTsNational Response CenterWaste StoragePrecious MetalsTreatment Storage and DisposalLandfillinge-ManifestsCERCLA Hazardous SubstancesChemicalsTrashCESQGsEHSsSQGsResource Conservation and RecoveryMunitionsWaste BurningVSQGsEpisodic GenerationHMTHighly Hazardous ChemicalEmergency EquipmentCharacteristic WasteGarbagePharmaceutical WasteElectronic ManifestsPlacardsCathode Ray TubesIgnitabilityIndustrial FurnacesWaste CodesHMRLabelsHazWasteOne PlanSolvent Contaminated WipesHazardous Waste GeneratorsAccumulationSolvent WasteListed WasteTagsLarge Quantity GeneratorsNon-Acute WasteSMS PremiumSMS Trial EnterpriseSMS AdvancedSMS EssentialSMS Trialr40CFR84r40CFR271r40CFR261r40CFR266r40CFR270r40CFR26240 CFR 8440 CFR 27140 CFR 26140 CFR 26640 CFR 27040 CFR 26240 CFR 271 Requirements for authorization of state hazardous waste programs40 CFR 261 Identification and listing of hazardous waste40 CFR 266 Standards for the management of specific hazardous wastes and specific types of hazardous waste management facilities40 CFR 270 EPA administered permit programs: the hazardous waste permit program40 CFR 262 Standards applicable to generators of hazardous waste
2023-10-19T05:00:00Z

EPA: Protection of Stratospheric Ozone: Updates Related to the Use of Ozone-Depleting Substances as Process Agents

SUMMARY: This action proposes to establish recordkeeping and reporting requirements for uses of ozone-depleting substances as process agents and to update definitions to reflect current practice. Codified recordkeeping and reporting requirements would provide clear and consistent notice each year of information EPA collects, aggregates, and reports as a party to the Montreal Protocol on Substances that Deplete the Ozone Layer; effectively monitor these narrow uses in a more routine and consistent manner under the Clean Air Act; and enhance understanding of emissions of substances harmful to the ozone layer.

DATES: Comments on this notice of proposed rulemaking must be received on or before December 4, 2023, published in the Federal Register October 19, 2023, page 72027.

View proposed rule.

2023-10-18T05:00:00Z

EPA: Vessel Incidental Discharge National Standards of Performance

SUMMARY: On October 26, 2020, the U.S. Environmental Protection Agency (EPA) proposed under the Vessel Incidental Discharge Act (VIDA) national standards of performance for marine pollution control devices for discharges incidental to the normal operation of primarily non-military and non-recreational vessels 79 feet in length and above into the waters of the United States or the waters of the contiguous zone (hereafter, “the proposed rule”). This supplemental notice presents ballast water management system type-approval data EPA received from the U.S. Coast Guard (USCG) since the proposed rule and supplements the proposed rule with supplemental regulatory options that EPA is considering for discharges from ballast tanks, hulls and niche areas, and graywater systems. These supplemental options are informed by comments received during the first public comment period and subsequent meetings with interested states, tribes, and other stakeholders held between August and November 2021. EPA solicits public comment solely about the information presented in this document; the Agency is not soliciting public comment on any other aspects of the proposed rule that are not addressed in this document. All comments on this document and the comments on the proposed rule will be considered during the development of the final rule.

DATES: Comments must be received on or before December 18, 2023, published in the Federal Register October 18, 2023, page 71788.

View proposed rule.

2023-10-18T05:00:00Z

EPA: Non-Hazardous Secondary Material Standards; Response to Petition

SUMMARY: The Environmental Protection Agency is finalizing its denial of a rulemaking petition from American Forest and Paper Association et al. requesting amendments to the Non-Hazardous Secondary Materials regulations, initially promulgated on March 21, 2011, and amended on February 7, 2013, February 8, 2016, and February 7, 2018, under the Resource Conservation and Recovery Act. These regulations establish standards and procedures for identifying whether non-hazardous secondary materials are solid wastes when legitimately used as fuels or ingredients in combustion units. The petition requested the following amendments: Change the legitimacy criterion for comparison of contaminants in the non-hazardous secondary material against those in the traditional fuel the unit is designed to burn from mandatory to “should consider”; remove associated designed to burn and other limitations for creosote-treated railroad ties; and revise the definition of “paper recycling residuals” to remove the limit on non-fiber materials in paper recycling residuals that can be burned as a non-waste fuel. The Environmental Protection Agency proposed to deny the petition on January 28, 2022. After review of the public comments, the Agency is finalizing its denial of the requested amendments. In addition to denying this rulemaking petition, the Agency is revising the definition of paper recycling residuals to limit the impact non-fiber materials may have on the heat value of paper recycling residuals in order for them to be considered a non-waste fuel.

DATES: This final rule is effective on December 18, 2023, published in the Federal Register October 18, 2023, page 71788.

View final rule.

§241.2 Definitions.
Definition of ”Paper recycling residuals”RevisedView text

Previous Text

§241.2 Definitions.

Paper recycling residuals means the secondary material generated from the recycling of paper, paperboard and corrugated containers composed primarily of wet strength and short wood fibers that cannot be used to make new paper and paperboard products. Paper recycling residuals that contain more than small amounts of non-fiber materials including polystyrene foam, polyethylene film, other plastics, waxes and adhesives, dyes and inks, clays, starches and other coating and filler material are not paper recycling residuals for purposes of this definition.

2023-10-12T05:00:00Z

EPA: Reference Measurement Principle and Calibration Procedure for the Measurement of Ozone in the Atmosphere (Chemiluminescence Method)

SUMMARY: The Environmental Protection Agency (EPA) is finalizing an update to the current ozone absorption cross-section to the recommended consensus-based cross-section value of 1.1329x10 −17 cm 2 molecule −1 or 304.39 atm −1 cm −1, with an uncertainty of 0.94 atm −1 cm −1. The new value is 1.2% lower than the current value of 308 atm −1 cm −1 and reduces the uncertainty in the value to 0.31%. The adoption of this updated ozone absorption cross-section could result in increases in measured ozone concentrations but given the existing sources of potential variability in monitoring data, it is unlikely that there will be any consistent measurable and predictable effect on reported data. The EPA is also updating the dates of publication for two references associated with the updated cross-section value, adding a new reference, and making a technical correction to move three figures inadvertently placed in section 6.0 References to a new section 7.0 Figures.

DATES: This final rule is effective on November 13, 2023, published in the Federal Register October 12, 2023, page 70595.

Appendix D to Part 50 - Reference Measurement Principle and Calibration Procedure for the Measurement of Ozone in the Atmosphere (Chemiluminescence Method)
Sections 2.2, 4.1 and 4.5.3.10RevisedView text
Section 6, references 13 and 14RevisedView text
Section 6, figures 1., 2., and 3RemovedView text
Section 6, reference15AddedView text
Section “7.0 Figures.AddedView text

Previous Text

Appendix D to Part 50 - Reference Measurement Principle and Calibration Procedure for the Measurement of Ozone in the Atmosphere (Chemiluminescence Method)

* * * * *

2.0 Measurement Principle.

* * * * *

2.2 The measurement system is calibrated by referencing the instrumental chemiluminescence measurements to certified O3 standard concentrations generated in a dynamic flow system and assayed by photometry to be traceable to a National Institute of Standards and Technology (NIST) standard reference photometer for O3 (see Section 4, Calibration Procedure, below).

* * * * *

4.0 Calibration Procedure.

4.1 Principle. The calibration procedure is based on the photometric assay of O3 concentrations in a dynamic flow system. The concentration of O3 in an absorption cell is determined from a measurement of the amount of 254 nm light absorbed by the sample. This determination requires knowledge of (1) the absorption coefficient (α) of O3 at 254 nm, (2) the optical path length (l) through the sample, (3) the transmittance of the sample at a nominal wavelength of 254 nm, and (4) the temperature (T) and pressure (P) of the sample. The transmittance is defined as the ratio I/I0, where I is the intensity of light which passes through the cell and is sensed by the detector when the cell contains an O3 sample, and I0 is the intensity of light which passes through the cell and is sensed by the detector when the cell contains zero air. It is assumed that all conditions of the system, except for the contents of the absorption cell, are identical during measurement of I and I0. The quantities defined above are related by the Beer-Lambert absorption law,



Where:

α = absorption coefficient of O3 at 254 nm = 308 ±4 atm−1 cm−1 at 0°C and 760 torr, 1 2 3 4 5 6 7

c = O3 concentration in atmospheres, and

l = optical path length in cm.

A stable O3 generator is used to produce O3 concentrations over the required calibration concentration range. Each O3 concentration is determined from the measurement of the transmittance (I/I0) of the sample at 254 nm with a photometer of path length l and calculated from the equation,



The calculated O3 concentrations must be corrected for O3 losses, which may occur in the photometer, and for the temperature and pressure of the sample.

* * * * *

4.5 Procedure.

* * * * *

4.5.3.10 Calculate the O3 concentration from equation 4. An average of several determinations will provide better precision.



Where:

[O3]OUT = O3 concentration, ppm

α = absorption coefficient of O3 at 254 nm = 308 atm−1 cm−1 at 0°C and 760 torr

l = optical path length, cm

T = sample temperature, K

P = sample pressure, torr

L = correction factor for O3 losses from 4.5.2.5 = (1−fraction of O3 lost).

Note:

Some commercial photometers may automatically evaluate all or part of equation 4. It is the operator's responsibility to verify that all of the information required for equation 4 is obtained, either automatically by the photometer or manually. For “automatic” photometers which evaluate the first term of equation 4 based on a linear approximation, a manual correction may be required, particularly at higher O3 levels. See the photometer instruction manual and Reference 13 for guidance.

* * * * *

6.0 References.

* * * * *

13. Technical Assistance Document for the Calibration of Ambient Ozone Monitors, EPA publication number EPA-600/4-79-057, September, 1979. [Available at www.epa.gov/ttnamti1/files/ambient/criteria/4-79-057.pdf.]

14. QA Handbook for Air Pollution Measurement Systems - Volume II. Ambient Air Quality Monitoring Program. EPA-454/B-13-003, May 2013. [Available at http://www.epa.gov/ttnamti1/files/ambient/pm25/qa/QA-Handbook-Vol-II.pdf.]

* * * * *

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