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Exposure and Fate Assessment Screening Tool Version 2014 (E-FAST 2014)

The new version of E-FAST (2014) contains the same user interface, workflows, calculations, and report formats as version 2.0. However, the system has been updated to be compatible with newer Windows operating systems and to reflect the latest exposure factors from the Exposure Factors Handbook (U.S. EPA, 2011).

What Does E-FAST 2014 Do?
Provides screening-level estimates of the concentrations of chemicals released to air, surface water, landfills, and from consumer products. E-FAST 2014 is being designed to support both our new chemicals and existing chemical programs. Estimates provided are potential inhalation, dermal and ingestion dose rates resulting from these releases. Modeled estimates of concentrations and doses are designed to reasonably overestimate exposures, for use in screening level assessment.

How Does E-FAST 2014 Work?
E-FAST 2014 calculates appropriate human potential dose rates for a wide variety of chemical exposure routes and estimates the number of days per year that an aquatic ecotoxicological concern concentration will be exceeded for organisms in the water column. Version 2014 includes a new entry page where the user enters physical/chemical property and chemical fate information. The user selects the exposure modules that need to be run in E-FAST 2014 and this will determine what p-chem and fate information is required. E-FAST 2014 also uses the Screen 3 ambient air model to estimate outdoor air exposures. E-FAST 2014 will also have the capability of identifying endangered species which could be exposed to environmental releases when site-specific release information is available.

What Do I Need to Use E-FAST 2014?
To execute the E-FAST 2014 model in order to assess general population exposure and aquatic environmental exposure and risk resulting from industrial releases, you will need to enter: amount of chemical releases; media of release; days per year of release; certain chemical properties; where possible, detailed release location data; if no detailed location data is available, generic industry codes can be applied. To execute the consumer exposure assessment modules in E-FAST 2014, the user will need to enter: the type of product; weight fraction; vapor pressure; and molecular weight.

How Are E-FAST 2014 Data Used?
The program produces a summary sheet with multimedia concentrations from multiple release activities. Risk assessors can use the potential dose estimated by E-FAST 2014 in assessing potential exposure and risk at a screening level. EPA intends to add an exposure summary report generator to a future version of E-FAST. This would also prompt the user to enter monitoring data and information if available, instead of using model estimates.

What Type of Computer System Do I Need?
An IBM-compatible with Windows® 95 or later, with 32 MB RAM and 85 MB hard disk space, and at a minimum a Pentium processor or equivalent.

What's New?
E-FAST Version 2014 is now available. The consumer exposure portions of E-FAST have been peer reviewed by experts outside EPA, and EPA has developed E-FAST 2014 using the external peer review comments for the general population, down-the-drain, environmental exposure and risks aspects of E-FAST. This model was developed under contract by Versar Inc. for the EPA Office of Pollution Prevention and Toxics. Click the link below for a more detailed description of updates found in E-FAST 2014.

To download the latest version of E-FAST, visit the Download E-FAST page.

E-FAST 2014 Questions/Answers

E-FAST 2014 Computer-Based Training Introductory Course

Exposure And Fate Assessment Screening Tool Version 2014 (E-FAST 2014) Documentation Manual (PDF file, 4.7 MB)

The Documentation Manual listed above is based on the previous version of the tool, E-FAST V2.0. The only changes made to E-FAST 2014 were programming modifications to make the system compatible with newer Windows operating systems and updates to the exposure factors to reflects the latest values from the Exposure Factors Handbook (U.S. EPA, 2011). The manual is still relevant to the current 2014 version because no changes were made to the workflow or calculations.

[PDF] PLEASE NOTE: the documentation manual linked from this page is in Adobe's Portable Document Format (PDF). To view or print them you will need to have the Adobe Acrobat Reader program installed on your computer. The Reader can be downloaded and used with no charge; for more information at EPA about PDF files.

Who Can I Call for More Information?
For more information about the model, contact:

David Tobias
U.S. Environmental Protection Agency
1200 Pennsylvania Avenue N.W.
Washington, DC 20460
E-mail: David Tobias

James Kwon
U.S. Environmental Protection Agency
1200 Pennsylvania Avenue N.W.
Washington, DC 20460
E-mail: James Kwon



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