Worldwide Residential Soil Regulatory Guidance Values for Chlorinated Methanes
Publication: Journal of Environmental Engineering
Volume 137, Issue 6
Abstract
In many environmental jurisdictions worldwide, surface soil contamination is regulated using guidance values that specify the maximum amount of pollutant that can be present without prompting a regulatory response. Three of the four chlorinated methanes are among the seven most frequently regulated synthetic surface soil contaminants. There are at least 80 U.S. regulatory jurisdictions and at least 30 international jurisdictions with guidance values for at least one of the chlorinated methanes, yielding as many as 106 values (for dichloromethane) for the same regulatory consideration. This analysis explores the variability of these values. Results indicate that the values span at least 5 orders of magnitude and are distributed in patterns similar to a lognormal random variable, but fit distributions that are statistically distinct. The distributions also contain value clusters that may imply emerging consensus about appropriate regulatory levels or demonstrate the impact of regulatory leadership to suppress variability. Simulation based on the current U.S. Environmental Protection Agency risk analysis model are used to estimate the degree to which value ranges may be attributed to uncertainty in exposure models. Approximately 50% of guidance values fall within the 95% confidence interval uncertainty bounds of risk model results.
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Acknowledgments
The work described in this paper has benefited from the efforts of several scholars who have helped to identify soil contamination RGVs and develop the methods by which they may be captured, validated, and analyzed. The author particularly acknowledges Dr. Jun Ma, Elijah Petersen, Amy Hanna, Paul Manglona, Mikkhail Miller, and Maurice Gayle for their contributions. Elements of this effort were conducted with the support of National Science Foundation grant NSFCMS CBET-0650675 and U.S. Department of Transportation grant USDOTDTRT06-G-0037.
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Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 137 • Issue 6 • June 2011
Pages: 416 - 432
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Apr 15, 2010
Accepted: Dec 2, 2010
Published online: May 16, 2011
Published in print: Jun 1, 2011
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