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Heating Oil Tanks Program

Screening Model for Volatilization from Soil to Indoor Air at Heating Oil Tank Sites

The Heating Oil Tank Program has developed a spreadsheet model designed to estimate simple site-specific screening levels for volatilization from soil to indoor air at heating oil tank sites. As illustrated in the figure below, the model assumes that all of the volatile contaminant mass in a known volume of contaminated soil enters a building and mixes with the indoor air which is being replaced at a constant exchange rate. The infiltration and mixing occurs over the entire exposure period.

Graphic of Screening Model

This spreadsheet is intended for use by Oregon DEQ staff, and is offered for public use without guarantees or support by the Department. The Department may decide to use risk-based screening levels other than those generated by this spreadsheet. This spreadsheet was developed in Microsoft® Excel 2002 and may not work on other programs or on older versions of Excel.

NOTE: The spreadsheet below has been updated to make it consistent with the updated Risk-Based Decision Making for the Remediation of Petroleum Contaminated Sites. It now also accepts data in feet and cubic yards as well as meters and cubic meters.

[print version]


For more information about DEQ's Land Quality programs, visit the DEQ contact page.

Oregon Department of Environmental Quality
Headquarters: 700 NE Multnomah Street, Suite 600, Portland, OR 97232
Phone: 503-229-5696 or toll free in Oregon 1-800-452-4011
Oregon Telecommunications Relay Service: 1-800-735-2900  FAX: 503-229-6124

The Oregon Department of Environmental Quality is a regulatory agency authorized to protect Oregon's environment by
the State of Oregon and the Environmental Protection Agency.

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