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Vapor Intrusion

Vapor Intrusion refers to the migration of vapors from subsurface contaminant sources to buildings such as a homes or workplaces. API conducts research towards improving the screening process for vapor intrusion at sites where petroleum releases have occurred.


29th Annual International Conference on Soils, Sediments, Water, and Energy
October 21-24, 2013

University of Massachusetts, Amherst, MA
Visit http://www.aehsfoundation.org/east-coast-conference.aspx to register for the conference.

API is sponsoring workshops on LNAPL and Petroleum VI at the conference:

Tuesday Oct 22
Workshop 6 -  6:30pm – 9:30pm

Estimation of LNAPL Transmissivity Workshop

Andrew J. Kirkman P.E., BP Corporation North America, Inc., Naperville, IL
LNAPL Transmissivity is an emerging metric for quantifying the recoverability of LNAPL. This metric was referenced in 2006 by the ASTM guide for Development of Conceptual Site  Models and Remediation Strategies for Light Nonaqueous-Phase Liquids Released to Subsurface E2531 and in 2009 by the Interstate Technology Regulatory Guidance Council document  Evaluating LNAPL Remedial Technologies for Achieving Project Goals. Since these publications LNAPL transmissivity has been referenced in State Guidance documents Such as the Virginia guidance document LPR-SRR-03-2012. ASTM International Inc. has published guidance on the estimation of LNAPL Transmissivity in the ASTM standard, E2856-13 as well as the American Petroleum Institute has published an Microsoft Excel tool to analyse LNAPL baildown tests. This workshop will advance participant understanding of LNAPL transmissivity estimation by working through examples of baildown tests, manual skimming tests, and the analysis of recovery system data comparing each tests advantages and limitations.  The class will request participants to bring a laptop, review the ASTM standard E2856 and/or the API document API LNAPL Transmissivity Workbook: A Tool for Baildown Test Analysis  (http://api.org/environment-health-and-safety/clean-water/ground-water/lnapl/lnpl-trans).

Wednesday, Oct 23
Workshop 9 - 6:30pm – 9:30pm

Recent Developments in the Evaluation of the Vapor Intrusion at Petroleum Release Sites

John Boyer, New Jersey Department of Environmental Protection in Trenton, NJ
Robin Davis, Utah Department of Environmental Quality, Salt Lake City, UT
Todd Ririe, BP, La Palma, CA
George DeVaull, Shell Global Solutions, Houston, TX
This workshop will focus on presenting updates to the assessment and evaluation of vapor intrusion from subsurface sources into buildings from petroleum release sites. Topics to be covered include: 1) Conceptual site model for petroleum vapor intrusion (PVI) and the differences between petroleum and chlorinated solvent vapor intrusion; 2) Types and characteristics of sites where PVI is an issue; 3) The API Biovapor model as a tool to evaluate PVI; 4) Update on exclusion criteria that can be used to screen out sites from PVI; 5) Sampling and analytical methods for PVI, and 6) An update on a number of new guidance documents from EPA OUST, CA, and ITRC and their impact on future PVI investigations.

BioVapor Indoor Vapor Intrusion Model

BioVapor is a user-friendly spreadsheet implementation of an indoor vapor intrusion model with oxygen-limited biodegradation. The BioVapor model is a steady-state 1-D analytical model intended to provide the user with an improved understanding of the potential effect of vadose zone aerobic biodegradation on the vapor intrusion pathway.  View More


API has produced several publications on developing screening criteria, site assessment and vapor biodegradation.  View More


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