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The
J&E Model is a one-dimensional analytical solution to convective and diffusive
vapor transport into indoor spaces. It provides an estimated attenuation
coefficient that relates the vapor concentration in the indoor space to
the vapor concentration at the source of contamination. The model can
simulate either a steady-state solution to vapor transport (constant source)
or a quasi-steady-state solution (diminishing source). Inputs to the model
include the chemical properties of the contaminant, the properties of
the soil in the saturated and unsaturated zones, and the structural properties
of the building. |
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Home
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Johnson-Ettinger
model Home Site |
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Functions
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Human Health Risk
Assessment
Analytical Modeling
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Input
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Tabular File:
NA
Graphical File:
NA
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Output |
- Tabular File:
*.xls
- Graphical File:
NA
- Print Report:
Yes
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Contaminants
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- Chlorinated Solvents
- Petroleum
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Media |
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| Technical
Team Members |
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| Comments |
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| J&E Model - data
loading |
| • Data must be entered
manually. Data are entered into a Microsoft Excel spreadsheet. |
| • Some cells have pulldown
menus so the user can toggle through the list of applicable fields,
such as chemical compound and soil parameters. |
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| J&E Model - graphic
loading |
| • Not applicable. |
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| J&E Model - logical
flow |
| • Users enter data in
the DataEntry worksheet. |
| • Parameters are listed
in the ChemProps worksheet. |
| • Chemical properties
of the selected compounds are listed in the ChemProps worksheet.
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| • Results are calculated
in the Compute worksheet. |
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| J&E Model - expert
knowledge |
| • An understanding of
the site characteristics is necessary to select appropriate parameter
values. |
| • Expert knowledge is
necessary to interpret results and understand parameters. |
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| J&E Model - documentation
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| • The users manual is
designed to lead users through data entry process by explaining
the meaning and limits of each of the applicable fields. |
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| J&E Model - output
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| • Results are displayed
in Microsoft Excel format within the workbook's Compute worksheet.
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| • Results can be saved
as a Microsoft Excel workbook. |
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| J&E Model - sources
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| • Version 3.0 downloaded
November 19, 2004. |
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Note that
this DST matrix is under active construction. Comments and suggestions
about the structure
or content of this website should be sent to Mike
Adam .
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| This
web site contains technology information from private contractors and
government agencies and is for informational purposes only. EPA cannot
guarantee the accuracy or completeness of the data. Reference to any specific
commercial product, process, or service, by trade name, trademark, manufacturer,
or otherwise, does not constitute or imply the endorsement, recommendation,
or favor of the United States Government. |
Johnson-Ettinger
model (J&E model) Overview 