Environmental Enlightenment #194
By Ami Adini - January 10, 2012

This is a SHORT, LIGHT and SIMPLE newsletter. Its purpose is to rekindle in the initiated terminology they have once learned, and enlighten the uninitiated on terms they may have heard but never known the meaning of.

Vapor Intrusion-Mitigation

Throughout the past decade, the risk of subterranean toxic vapors intruding into indoor environments has been getting closer examination from a concerned public as well as from scientists and the environmental regulatory universe.

The model below depicts intrusion of volatile organic compounds (VOCs). Common sources of such vapors are chlorinated solvents from dry cleaning operations and petroleum products from underground storage tank systems. Some of these compounds are antagonistic to human health.



In 2004, the Department of Toxic Substances Control (DTSC) in the California EPA generated an interim Vapor Intrusion Guidance document providing a step-wise approach to assessing the risk to inhabitants of buildings at sites where subsurface contaminants could potentially enter the indoor environment as vapors.

In October of 2011, DTSC released an updated version of the Guidance, which incorporates new procedures for screening and evaluating potential risks.

In addition, DTSC created the Vapor Intrusion Mitigation Advisory on mitigation and remediation of vapor intrusion. The Advisory provides a framework for adequate decision-making to

  • determine whether mitigation is appropriate,
  • establish the proper mitigation system to implement, and
  • ensure that the implementation is sustainable for the duration of mitigation.

Staff at our firm prepared a PowerPoint presentation outlining the main points of the Guidance and the Advisory. The presentation is available as a PDF here.


You can find past issues of "Environmental Enlightenment" at www.amiadini.com Wealth of information about environmental site assessments in the real estate transactions and issues concerning assessment and cleanup of contamination in the subsurface soil and groundwater.

Call me if you've got any questions. There are no obligations.

Ami Adini
Ami Adini & Associates, Inc.
Environmental Consultants
Underground Storage Tank Experts
818-824-8102; 818-824-8112 fax
mail@amiadini.com
www.amiadini.com

Ami Adini is a mechanical engineer, California Registered Environmental Assessor, Level II, and president of AMI ADINI & ASSOCIATES, INC. (AA&A), an environmental consulting firm specializing in all phases of environmental site assessments, rehabilitation of contaminated sites and upgrading of underground storage tank facilities. AA&A supplies practical solutions to environmental concerns using the highest standards of ethics and integrity while providing its clients with maximum return on their investments.

Some images reproduced under the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation, and courtesy of http://en.wikipedia.org and http://commons.wikimedia.org. For detailed copyright information, contact AA&A.