An official website of the United States government.

Underground Storage Tanks (USTs)

3-D Modeling of Aerobic Biodegradation of Petroleum Vapors: Effect of Building Area Size on Oxygen Concentration Below the Slab

This 2013 technical report presents results of 3-D finite difference vapor transport modeling simulations designed to systematically assess the development of an oxygen shadow beneath a building.

For assistance with accessibility for the PDFs, please email Sharon Fredericks (

You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.