Environmental Enlightenment #118

By Ami Adini - Reissued December 29, 2015

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.


 “Ad” means “toward”, and “vection” comes from “vehere” meaning, to carry. It’s all Latin. Put them together and we get “advection.”

Merriam Webster on-line defines advection as “the usually horizontal movement of a mass of fluid (as air or an ocean current); also: transport (as of pollutants or plankton) by such movement.”

In meteorology, advection is the horizontal transfer of any atmospheric property (hot air, cold air, moist air, etc.) by the wind.

Advection Fog in San Francisco

Volatile organic chemicals (VOCs) can be emitted from contaminated soil or groundwater and intrude overlying buildings, impacting the quality of indoor air.

Heating, ventilation and air conditioning systems (“HVAC” systems), basements, strong winds and other factors can exacerbate vapor intrusion problems by reducing internal air pressure and creating a "vacuum effect" that enhances the advective flow of vapors through building floors.

The field of vapor intrusion investigations is still evolving.

Acknowledgment: “ Screening For Environmental Concerns At Sites With Contaminated Soil and Groundwater; INTERIM FINAL - February 2005;” California Regional Water Quality Control Board, San Francisco Bay Region, Oakland, California.

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.