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Subscribe to this list via RSS Blog posts tagged in USEPA

Posted by on in Centers of Excellence
Posted on behalf of authors Michael Ierardi and Claire McMenamy.

TSCA Stakeholder Meeting for Risk Assessment and Risk Prioritization- Will Your Business be Ready?

The U.S. Environmental Protection Agency (EPA) held two public meetings to gather input that will inform a proposed rule to establish a risk-based process for chemical prioritization (August 10), in addition to its process for conducting risk evaluations to determine whether a chemical presents an unreasonable risk of injury to health or the environment under TSCA section 6(b) (August 9).

By June 2017, EPA must decide on a risk-based screening process for evaluating new and existing chemicals. The previous “unreasonable risk” standard will be replaced by the “safety standard” for regulating chemicals, which will consider both hazard and exposure in a risk-based approach that is protective of human health and the environment.

During these meetings, stakeholders from government, private industry, academia, non-governmental organizations, as well as medical professionals, offered feedback regarding their suggestions and concerns. Cardno ChemRisk scientists, Dr. Denise Hill and Ms. Claire McMenamy, attended the meetings, and offer the following observations, as well as the selected comments, repeatedly offered by multiple stakeholders:

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Posted by on in Centers of Excellence

Cardno ChemRisk scientist, Denise Hill, will be attending the August 9th and August 10th public meetings hosted by the EPA regarding the amended Toxic Substances Control Act.

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Posted by on in Centers of Excellence

Posted on behalf of the author, Allison Insley.

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Posted by on in Policy/Regulatory Support
The US Environmental Protection Agency (USEPA) is currently soliciting feedback for its Draft Guidelines for Human Exposure Assessment. The current guidance document for human exposure assessment, Guidelines for Exposure Assessment, was published in 1992 and incorporates exposure assessment knowledge that was formulated in the 1970s and 1980s. The updated guidelines expand upon topics currently included in the guidance document, including planning and scoping for an exposure assessment, data acquisition and use, modeling, and consideration of uncertainty. New information regarding planning and conducting an observational human exposure measurement study, as well as considerations of different life stages and sensitive populations in exposure assessments, have also been added to the guidelines. The deadline to submit comments on the draft document is February 22, 2016.

Posted on behalf of Michael Ierardi
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Posted by on in Policy/Regulatory Support

The United States Environmental Protection Agency's (USEPA) Regional Screening tables were recently updated. These Regional Screening tables are typically revised and posted twice per year. The Regional Screening Levels (RSLs) presented in these tables are risk-based concentrations that are derived from equations that take into account exposure assumptions, in addition to USEPA toxicity data. RSLs are used in the initial screening of contaminated sites, including Superfund sites, such that particular areas, contaminants, and conditions at the sites are identified and receive further attention from USEPA. The screening levels are considered to be protective for human health over a lifetime and do not consider any ecological risk endpoints.

As part of the update, the RSLs for several chemicals were adjusted to reflect changes in their toxicity values and chemical-specific parameters. Specifically, the inhalation unit risk for dibromochloromethane was deleted when it was withdrawn by Cal EPA. Additionally, toxicity values for nine chemicals were added, because these chemicals have new Provisional Peer Reviewed Toxicity Values (PPRTV), 11 chemicals were changed from old Health Effects Assessment Summary Table (HEAST) toxicity values to updated PPRTV toxicity values, common chemical names for 24 pesticides were replaced with their technical names, and melting point values were added to the parameter table for all chemicals. Furthermore, all of the physico-chemical parameter values were revised to be consistent with those used to determine the USEPA Vapor Intrusion Screening Levels (VISLs).

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