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Model Report


Last Revision Date: 07/11/2011 View as PDF
General Information Back to Top
Model Abbreviated Name:

Model Extended Name:

Model Overview/Abstract:
INTRODUCTION: The Chemical Screening Tool for Exposures and Environmental Releases (ChemSTEER) is a personal computer-based software program that uses the U. S. Environmental Protection Agency (EPA) Office of Pollution Prevention and Toxics' most current screening-level workplace exposure and release assessment methods. ChemSTEER generates screening-level estimates of environmental releases of and worker exposures to a chemical manufactured and used in industrial and commercial operations and workplaces. The tool also contains data and estimation methods to assess situations involving common industrial / commercial sectors (e.g., automotive refinishing) and chemical functional uses (e.g., surfactant in hard surface cleaner - this use not included in current draft). ChemSTEER does not contain methods for estimating exposures to chemicals to the general public, to consumers, or to other species in the environment.

ChemSTEER was developed for technically-knowledgeable users to support the EPA in assessing the potential exposures and risks to chemicals. A primary application is for assessing new chemicals that are submitted to EPA under Section 5 of the Toxic Substances Control Act (TSCA). Estimates from screening-level exposure models are rarely, if at all, used as the sole justification for regulatory decision making at EPA. When available, additional information, data, and more rigorous tools are used to improve the estimates of exposures and risks for such decisions. Another primary application is for assessing existing chemicals, such as those chemicals covered under the High Production Volume (HPV) Program, for which monitoring data are insufficient or unavailable. However, the use of ChemSTEER is not intended as a substitute for the collection and reporting of monitoring data for exposures and releases.

The methods and models in ChemSTEER have undergone internal EPA review and most have been used extensively in EPA assessments for over 10 years. EPA is in the process of pursuing external peer review for these methods and models.

PREREQUISITES: The user must have a good understanding of the workplaces to be assessed (except for some specific industries programmed as "industry-specific operations" in ChemSTEER) and have some key chemical- and operation- specific data (e.g., vapor pressure, molecular weight, water solubility, throughput volumes, concentrations). The user must have a good working knowledge of ChemSTEER and its methods to generate credible assessment results.

BRIEF ON LOGIC AND LAYOUT: The current beta version was developed primarily to meet the objective of producing internal EPA reports on workplace releases and exposures. The logic and layout of the program were developed to achieve this objective.

Model Technical Contact Information:
Jay Jon
Office of pollution Prevention and Toxics (OPPT)
Economics, Exposure, and Technology Division (EETD)
Chemical Engineering Branch (CEB)

The model was developed and is maintained by the U.S. EPA, Office of Pollution Prevention and Toxics (OPPT), Economics, Exposure, and Technology Division (EETD), Chemical Engineering Branch (CEB).

Model Homepage: http://www.epa.gov/oppt/exposure/pubs/chemsteer.htm

User Information Back to Top
Technical Requirements
Computer Hardware
PC, Pentium or higher (500 MHz or faster recommended),

Memory - 64 MB

Hard disc space - 30 MB (installed files); 25 MB (installation file - can be deleted following installation)

Monitor resolution - 800 x 600 or higher

Compatible Operating Systems
Windows 95, 98, or later
Other Software Required to Run the Model
Visual Basic, Microsoft Access
Download Information
The model is publicly available from the U.S. EPA, Office of Pollution Prevention and Toxics (OPPT), Economics, Exposure, and Technology Division (EETD), Chemical Engineering Branch (CEB).


Using the Model
Basic Model Inputs
Screening model with moderate input requirements.
Basic Model Outputs
Daily per site and annual release rates to each medium; Exposure concentrations and potential dose rates for worker inhalation and dermal routes.
User Support
User's Guide Available?
Help System serves as the user's guide.
User Qualifications
User needs only moderate level of technical education and/or modeling experience. Technical understanding of exposure issues, particularly relevant to the workplace, and the ability to understand the methods contained in ChemSTEER are crucial to effective use of the tool.

Model Science Back to Top
Summary of Model Structure and Methods
10 release models and 13 exposure models rely upon a combination of physical chemical properties and facilities? daily throughput of the assessed chemical; some industry-specific throughput data are incorporated.

Model uses mixed U.S. and SI units.

Model Evaluation
The beta version of ChemSTEER has undergone some limited testing for code verification. Some models are in the peer review process, and some models use peer- reviewed data.

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