Tools for cleaning up petroleum contaminated sites

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.



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.

Tip: Download the Excel files to your computer rather than opening in a browser. Tools may not function correctly when opened directly from the website.

Workbook for calculating cleanup levels for petroleum contaminated sites (MTCATPH Version 12.0 Excel workbook) - Updated November 2023

These cleanup levels protect against harm from direct contact with soil. They also protect against harm from petroleum leaching into groundwater and drinking water.

This tool does not include options for evaluating potential MTCA air quality concerns via the Vapor Pathway. For more information about the vapor pathway, please visit our Vapor Intrusion page.

Additional help for the workbook

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. 

Package A will answer questions about:

Package B will answer questions about:

  • 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.
  • Open Package B of the Natural Attenuation Analysis Tool.

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.