Groundwater Sensitivity Toolkit

The Groundwater Sensitivity Toolkit was developed by GSI for the American Petroleum Institute and the California MTBE Research Partnership. The Toolkit was designed to help site managers, water purveyors and regulators evaluate the sensitivity of a groundwater resource to a potential release of compounds of concern (e.g., an MTBE-oxygenated fuel) at a particular site. The toolkit runs on Microsoft ExcelTM and comes with a user’s guide.

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Examines Three Aspects of Sensitivity: The toolkit examines three aspects of sensitivity: Resource Value, Receptor Vulnerability and Natural Sensitivity. The user supplies site-specific information and the toolkit returns a scorecard addressing the three aspects of sensitivity.

Versatility: Although this utility was designed with petroleum hydrocarbon releases in mind, it can be used when dissolved chlorinated and inorganic compounds are the chemicals of concern.

Technical Support

Version 1.0 of the Toolkit is now available. Technical Support is available by email at This email address is being protected from spambots. You need JavaScript enabled to view it.

System Requirements

IBM-compatible PC with Pentium or later processor. Recommended minimum 64 MB RAM (optimal 128 MB RAM) and 25 MB of free disk space and virtual memory. Requires Windows 98/NT/2000/XP and Microsoft Excel 97SR-1/2000/XP. The Groundwater Sensitivity Toolkit is not compatible with Excel 2007.


The Sensitivity Toolkit is available for free download at the American Petroleum Institute website: (Note: Link will launch in a new window)