toxicology update - implementation of revised impacts review procedures mike coldiron, p.e. air...
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![Page 1: Toxicology Update - Implementation of Revised Impacts Review Procedures Mike Coldiron, P.E. Air Permits Division Texas Commission on Environmental Quality](https://reader036.vdocuments.us/reader036/viewer/2022081421/5697bfd91a28abf838caf912/html5/thumbnails/1.jpg)
Toxicology Update -Implementation of
Revised Impacts Review Procedures
Mike Coldiron, P.E.Air Permits Division
Texas Commission on Environmental QualityAdvanced Air Permitting Seminar 2015
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Revisions to Review
Procedures
Revisions toReview
Procedures
o Procedural changes to impacts review were designed to reduce processing times
o Fewer projects will need review by the Toxicology Division (TD)
o Fewer ESLs will need to be derived
![Page 3: Toxicology Update - Implementation of Revised Impacts Review Procedures Mike Coldiron, P.E. Air Permits Division Texas Commission on Environmental Quality](https://reader036.vdocuments.us/reader036/viewer/2022081421/5697bfd91a28abf838caf912/html5/thumbnails/3.jpg)
Revisions to Review
Procedures
Revisions toReview
Procedures
o Case-by-case de minimis review will no longer require TD review
o For projects that meet the Tier II TD requirements, no TD review is needed
o Fewer particulate species will need a TD review
![Page 4: Toxicology Update - Implementation of Revised Impacts Review Procedures Mike Coldiron, P.E. Air Permits Division Texas Commission on Environmental Quality](https://reader036.vdocuments.us/reader036/viewer/2022081421/5697bfd91a28abf838caf912/html5/thumbnails/4.jpg)
Revisions to Review
Procedures
Revisions toReview
Procedures
De Minimi
s
Toxicological
Tiered Review
s
Particulate
Matter
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De Minimis Review
Procedures
Revisions to Review
Procedures
De Minimis
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Revisions to Review
Procedures
De Minimi
s
De Minimis Review
ProceduresCase-by-case reviews no longer require TD approval and may be completed by the permit reviewer if:o Modeled emissions
rates are the rates without the use of emission controls;
o Impacts are evaluated using SCREEN3 only;
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Revisions to Review
Procedures
De Minimi
s
De Minimis Review
Procedures
o The maximum off-property impacts are less than 10% of ESL for individual species; and
o The impacts for criteria pollutants are less than the SIL for all averaging periods
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Current Toxicological Tiered Permit
Reviews
Revisions to Review
Procedures
Toxicological Tiered
Reviews
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Current Toxicological Tiered Permit Reviews
Toxicology Review Tier
Review Criteria Responsibility for Review
Tier I All impacts are below ESLs APD
Tier IIImpacts on non-industrial receptors < ESL,Impacts on industrial receptors < 2X ESL
Toxicology
Tier III Case-by-case review Toxicology
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Revised Toxicological Reviews Tier II
Toxicology Review Tier
Review Criteria Responsibility for Review
Tier I All impacts are below ESLs APD
Tier IIImpacts on non-industrial receptors < ESL,Impacts on industrial receptors < 2X ESL
APD
Tier III Case-by-case review Toxicology
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Current Particulate Matter Review Procedures
Revisions to Review
Procedures
Particulate Matter
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Revisions to Review
Procedures
Particulate
Matter
Current Particulate Matter Review Procedures
o Over 4,000 species on the ESL List, but many more species in the world
o TD receives frequent requests for ESLs for PM species
o An ESL must be developed for each species not on the current ESL List
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Revisions to Review
Procedures
Particulate
Matter
Current Particulate Matter Review Procedures
o ESL development is time consuming, and applicants can wait two weeks or more for a response
o Many species are of limited concern
o Species of concern include metals and certain silica compounds
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Revisions to Review
Procedures
Particulate
Matter
Revised Particulate Matter Review Procedures
o For species of limited concern, no additional review is required, as long as compliance with the PM2.5 NAAQS is demonstrated
o For species of concern, use the current review procedures
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Revisions to Review
Procedures
Particulate
Matter
Particulate Matter Species of
Limited Concern
o Changes to PM species procedures represent a new impacts analysis approach
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Revisions to Review
Procedures
Particulate
Matter
Justification for Revised Procedures
o New approach still protective of public health
o Comparison of 24-hour NAAQS standard to equivalent 1-hour concentration
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Justification for Revised Procedures
Air Contaminant
Averaging Period
NAAQS (µg/m3)
1-hr to 24-hr Conversion
Factor
Equivalent 1-hr Concentration
(µg/m3)
PM2.5 24-hr 35 0.40 87.5
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Justification for Revised Procedures
Air Contaminant
Averaging Period
Surrounding Land Use
Example Background
Concentration (µg/m3)
1-hr to 24-hr Conversion
Factor
Equivalent 1-hr
Concentration (µg/m3)
PM2.5 24-hr Industrial 25 0.40 62.5
PM2.5 24-hr Rural 18 0.40 45.0
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Justification for Revised Procedures
Air Contaminant
Averaging Period
Equivalent 1-hr Concentration
(µg/m3)
Surrounding Land Use
Example Background
Concentration (µg/m3)
Equivalent 1-hr Allowable Total
Site Concentration
(µg/m3)
PM2.5 1-hr 87.5 Industrial 62.5 25.0
PM2.5 1-hr 87.5 Rural 45.0 42.5
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Revisions to Review
Procedures
Particulate
Matter
Implementation of Revised PM
Review Procedures
o Identification of all species and species emission rate calculations are still required
o For species of limited concern, no further species-specific analysis is required
o An appropriate PM2.5 NAAQS analysis is required
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Revisions to Review
Procedures
Particulate
Matter
Implementation of Revised PM
Review Procedures
o For all other species, the impacts analysis remains unchanged
o Even if the analysis is completed using the MERA flowchart, modeling may still be required to support the chemical flexibility condition
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Permit Condition Revisions
Permit Condition Revisions
o Current chemical flexibility special condition requires an ESL for each species
o The special condition has been revised to accommodate the revised impacts analysis
o No exceedance of the PM2.5 NAAQS is allowed
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Revised Procedure Exclusions
Revised Procedure Exclusions
o Contested case hearingso Public comments on
exposure to air contaminants
o Unsatisfactory compliance history rating
o Emissions of an APWL species in an APWL area
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In Review
Summary
o Case-by-case de minimis review will no longer require TD review
o For projects that meet the Tier II TD requirements, no TD review is needed
![Page 25: Toxicology Update - Implementation of Revised Impacts Review Procedures Mike Coldiron, P.E. Air Permits Division Texas Commission on Environmental Quality](https://reader036.vdocuments.us/reader036/viewer/2022081421/5697bfd91a28abf838caf912/html5/thumbnails/25.jpg)
In Review
Summary
o Fewer particulate species will need a TD review, and a PM2.5 NAAQS analysis will serve as a surrogate for these species
o The revised procedures are not allowed in certain cases
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In Review
Websites
Home
Rules and Rulemaking
Index of Common Permitted Facilities
Effects Screening Levels
Tables
Forms
BACT
MERA
Air Dispersion Modeling
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Contact Information
Phone Numbers
APIRT: (512) 239-3075
APD: (512) 239-1240 or
(512) 239-1250
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Contact Information
Mike Coldiron Contact Information
Mike Coldiron, P.E.
(512) 239-5027