About TCEQ Development Support Documents (DSDs) for Effects Screening Levels (ESLs) and Air Monitoring Comparison Values (AMCVs)
The public comment period has begun for 1 newly proposed DSD and 5 DSDs that have been revised!!
WHITE PAPER – Updated Recommendations for animal-to-human inhalation dosimetry
The public comment period for 3 proposed DSDs has begun!!
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What is a Development Support Document?
A Development Support Document (DSD) summarizes how chemical-specific toxicity values were derived based on RG-442, Guidelines to Develop Effects Screening Levels, Reference Values, and Unit Risk Factors.
When are Proposed and Final DSDs Published?
A proposed DSD is published at the TCEQ web site for a 60-day public review and comment period. After public comments are received, the TS will address and resolve all relevant issues and make scientifically defensible changes to the DSD and toxicity values, if needed.
The final DSDs with a Response to Comments, if applicable, are then published on the TCEQ website. Registrants on the Toxicology Announcement List will be notified by e-mail when proposed or final DSDs are posted.
WHITE PAPER – Updated Recommendations for Animal-To Human Inhalation Dosimetry
The Toxicology Division (TD) of the Texas Commission on Environmental Quality (TCEQ) is amending Section 3.9.1, Default Dosimetry Adjustments for Gases in the October 2012 regulatory guidance document, TCEQ Guidelines to Develop Toxicity Factors (RG-442). This section is being updated to include information on animal-to-human inhalation gas dosimetric adjustments based on recommendations in Advances in Inhalation Gas Dosimetry for Derivation of a Reference Concentration (RfC) and Use in Risk Assessment (USEPA 2012, EPA/600/R-12/044). Please refer to the White Paper for a discussion of the changes.
Current Public Comment Periods
The TD is accepting comments on 1 newly proposed DSD and 5 final DSDs that have been revised until February 3, 2014:
NEWLY PROPOSED DSD:
The following proposed DSD was developed based on TCEQ’s Toxicity Factors Guidelines RG-442 and the updated recommendations for animal-to-human dosimetric adjustments in USEPA (2012) and is being posted for public comment:
n-Butyraldehyde
FINAL DSDs THAT HAVE BEEN REVISED:
There are five final DSDs that were originally developed based on RG-442 (TCEQ 2006) and have been revised based on TCEQ’s Toxicity Factors Guidelines RG-442 (TCEQ 2012) and the updated recommendations for animal-to-human dosimetric adjustments in USEPA (2012). These revised DSDs are also being posted for public comment:
Acrolein
1,4-Dichlorobenzene
n-Butyl Acetate
Hydrogen Chloride
Methacrolein
The TD is accepting comments on the following DSDs until January 15, 2014:
Procedure to Submit Comments
Submit comments by e-mail to tox@tceq.texas.gov or by mail (must be received at the TCEQ no later than the respective comment period end dates) to:
Regular mail:
Toxicology Division, MC 168
Texas Commission on Environmental Quality
P.O. Box 13087
Austin, TX 78711-3087
Mail delivery services:
Toxicology Division, MC 168
Texas Commission on Environmental Quality
12100 Park 35 Circle, Bldg. F
Austin, TX 78753
Contact the TCEQ About DSDs and Fact Sheets
Call: 877-992-8370 (toll free) or 512-239-3900
E-mail: tox@tceq.texas.gov
Write: Texas Commission on Environmental Quality
Toxicology Division, MC 168
P.O. Box 13087
Sign Up to Receive ESL List, AMCV List, and Other Related Toxicology Announcements
For instructions on how to join the Toxicology Announcement List, click here.