Many sites and properties across the United States are contaminated by petroleum products, such as gasoline. These harmful products, and the chemicals they break down into, can threaten human health and the environment. We have guidance and statistical tools to help you understand how to clean up these sites and show that your cleanup is happening as planned.
Guidance for remediation of petroleum contaminated sites consolidates all the technical information for cleaning up petroleum-contaminated sites into one document. This technical guidance helps people learn how to meet the requirements of the state's cleanup law, the Model Toxics Control Act (MTCA), when cleaning up petroleum contamination.
Guidance on remediation of petroleum contaminated ground water by natural attenuation provides technical information for using natural attenuation to clean up petroleum contaminated groundwater.
We’ve developed Excel-based tools to help you calculate cleanup levels for petroleum contaminated sites. The packages on this page are specific to sites with petroleum contamination. If you have a site with other contaminants, check out our online cleanup tools page.
A tip when using these tools: Select “Save” or “Save As” instead of “Open” when the download dialog box opens. Tools may not function correctly when opened directly from the website.
This tool allows you to calculate cleanup levels for petroleum mixtures for two media:
- Soil using MTCA Methods B or C, and
- Groundwater using MTCA Method B.
The cleanup levels protect against harm from direct contact with soil, from petroleum leaching into groundwater and drinking water, and from vapor inhalation.
Workbook tools for calculating soil and ground water cleanup levels under the Model Toxics Control Act Cleanup Regulation: Users guide 11.1 (2007). The users’ guide answers questions about the tool, shows you how to use it, and helps you understand the results.
Additional help for the workbook
Troubleshooting and operating tips help navigate common problems when using different versions of Excel to download the tools.
Natural attenuation of petroleum contaminated groundwater
This tool is split into two packages. Use them to predict when natural attenuation will allow groundwater cleanup levels to be met or to demonstrate that levels have been met.
- Plume stability.
- Length of time for groundwater concentrations to reach a target level.
- The site’s ability to break down contamination.
- The possibility that changing groundwater elevation is affecting concentrations.
- Distance a dissolved plume will extend without intervention.
- Length of time until a target location reaches a cleanup level.
- The percent of mass that can be broken down naturally.
- The amount of source material that must be removed to let natural breakdown reach a target level by a certain date.
Additional help for the natural attenuation package
User's manual: Natural attenuation analysis tool package for petroleum-contaminated ground water (2005) provides guidance under MTCA on how to evaluate the feasibility and performance of natural attenuation for groundwater contaminated with petroleum hydrocarbons.