Science & Technology

This page shows all of the pages at www.epa.gov that are tagged with Science & Technology.

  • TSCA Section 21

    TSCA Section 21 regulations collect data for use in conducting assessment of potential chemical risk are described.

  • Reporting a TSCA Chemical Substantial Risk Notice

    Section 8(e) states that Any person who manufactures a chemical substance and obtains information that the chemical is harmful to health or the environment shall inform the EPA.

  • Regulation of Chemicals under Section 6(a) of the Toxic Substances Control Act

    EPA's existing chemicals programs address pollution prevention, risk assessment, hazard and exposure assessment and/or characterization, and risk management for chemicals substances in commercial use.

  • PRZM3 version 3.12 beta

    Page on version 3.12 (beta) of PRZM one-dimensional, finite-difference model that accounts for pesticide and nitrogen fate in the crop root zone. February 1998

  • PRZM3 version 3.12.2

    Page on version 3.12.2 of PRZM, a one-dimensional, finite-difference model that accounts for pesticide and nitrogen fate in the crop root zone. Released May 2005

  • PRZM2 version 2.3

    Page on version 2.3 of PRZM, a one-dimensional, finite-difference model that accounts for pesticide and nitrogen fate in the crop root zone. Released May 1996

  • PRZM2 version 1.02

    Page on version 1.02 of PRZM, a one-dimensional, finite-difference model that accounts for pesticide and nitrogen fate in the crop root zone. Released February 1993

  • PRZM3 version 3.12.1

    Page on version 3.12.1 of PRZM, a one-dimensional, finite-difference model that accounts for pesticide and nitrogen fate in the crop root zone. August 2003

  • PRZM3 Version 3.12.3

    PRZM on version 3.12.3 of PRZM, a one-dimensional, finite-difference model that accounts for pesticide and nitrogen fate in the crop root zone. May 2006

  • PRZM2 version 2.00

    Page on version 2.00 of PRZM, a one-dimensional, finite-difference model that accounts for pesticide and nitrogen fate in the crop root zone. Released October 1994

  • PEST Release Notes

    Release notes for the PEST (Parameter ESTimation) software, a model-independent parameter estimation package

  • EFDC Release Notes

    Release notes for the Environmental Fluid Dynamics Code (EFDC) multifunctional surface water modeling system software

  • PRZM2 version 1.00

    Page on version 1.00 of PRZM, a one-dimensional, finite-difference model that accounts for pesticide and nitrogen fate in the crop root zone. Released October 1992

  • Coastal Generalized Ecosystem Model (CGEM)

    CGEM is an open-source model designed for researchers and managers that need a flexible water quality model with multiple formulation options that can be adapted to a range of coastal and freshwater ecosystems.

  • EXPRESS (EXAMS - PRZM Exposure Simulation Shell) Release Notes

    Release notes for the EXPRESS software model. (EXAMS - PRZM Exposure Simulation Shell) which facilitates rapid & consistent assessment of aquatic pesticide exposure on a variety of crops.

  • Visual Plumes Release Notes

    Release notes for the Visual Plumes software model system, a Windows-based software application for simulating surface water jets and plumes.

  • 3DFEMWATER/3DLEWASTE Release Notes

    Notes on 3-D Finite Element Model of Water Flow Through Saturated-Unsaturated Media & 3-D Lagrangian-Eulerian Finite Element Model of Waste Transport Through Saturated-Unsaturated Media

  • FGETS Release Notes

    Release notes for Food and Gill Exchange of Toxic Substances: a simulation model that predicts temporal dynamics of fish whole body concentration of bioaccumulated chemicals.

  • EXAMS Version Index

    Versions of Exposure Analysis Modeling System, software for formulating aquatic ecosystem models & evaluating fate, transport, & exposure concentrations of synthetic organic chemicals.

  • EXAMS version 2.98.04.03

    Exposure Analysis Modeling System, software for formulating aquatic ecosystem models & evaluating fate, transport, & exposure concentrations of synthetic organic chemicals. May 2004

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