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 our "Environmental Enlightenment" at 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 have any questions. There are no obligations.

Ami Adini Environmental Services, Inc.
Environmental Consultants & General Engineering Contractors
California Lic. #1009513 A B HAZ ASB
818-824-8102; mail@amiadini.com

Ami Adini is a veteran environmental practitioner with over 40 years of experience. He carries a Bachelor of Science degree (B.Sc.) in Mechanical Engineering including academic credits in Nuclear and Chemical Engineering and postgraduate education in these fields. His career includes design and construction of nuclear plant facilities, chemical processing plants and hazardous wastewater treatment systems. He is a former California Registered Environmental Assessor Levels I & II in the 1988-2012 registry that certified environmental professionals in the assessment and remediation of environmentally impacted land, and a Registered Environmental Professional (REP) since 1989 with the National Registry of Environmental Professionals (NREP). He is a California Business & Professions Code Qualifying Responsible Managing Officer (RMO) in the General Engineering Contractor classification with Hazardous Substance Removal and Asbestos certifications, and president of AMI ADINI ENVIRONMENTAL SERVICES, INC. (AAES), a general engineering contractor and consulting firm specializing in environmental site assessments, rehabilitation of contaminated sites and removal of environmental risks from real-estate transactions. (Contact Ami for a complete resume.) AAES provides practical solutions to environmental concerns using the highest standards of ethics and integrity while providing its clients with maximum return on their investments.