October 9, 2013

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Geosyntec Practitioners to Present at Society for Risk Analysis December 9-12

Three senior practitioners from Geosyntec Consultants are set to present at the 32nd Annual Meeting of the Society for Risk Analysis in San Francisco December 9-12, 2012.

Principal Environmental Scientist Ruth Custance from Geosyntec's Santa Barbara office will present "Calculating Inhalation Exposures for Utility Workers at Contaminated Sites" as part of the Trench Models & Vapor Intrusion Track beginning at 1:50 p.m on December 11.

Additionally, Principal Toxicologist Ravi Arulanantham, Ph.D., and Senior Toxicologist Robert Cheung, both from Geosyntec's Oakland office, will present a poster during this year's annual meeting, "California Setting the Standard with Low-Threat UST Closure Criteria." It summarizes the state's new closure policy for underground storage tanks.

The annual meeting of the Society for Risk Analysis brings together nearly 1,000 international scientists and practitioners from a wide range of disciplines who share an interest in risk analysis. Representing academia, government, industry, NGOs, and private firms, society members recognize the value of diverse perspectives and a shared commitment to high-quality risk analysis methodology and practice.

Ms. Custance's presentation highlights her collaboration with colleagues at Geosyntec and MMI Engineering to develop a methodology for the use of computational fluid dynamic modeling to provide a more realistic estimate of trench air concentrations as compared to existing models. The work was presented to state regulators as a site"??_??specific alternative to the use of a more conservative screening level model. The methodology was recently approved and will result in a significant reduction in predicted trench air concentrations on the project.

Dr. Arulanantham's and Mr. Cheung's poster explains how the Low-Threat Underground Storage Tank Closure Criteria policy establishes consistent, statewide standards and criteria for the effective closure of underground storage tank projects in California. The Low-Threat policy, which became effective on August 17, 2012, acknowledges that most petroleum release cases pose a low threat to human health and the environment. To qualify for closure, a site must satisfy eight general criteria, as well as media and pathway-specific criteria for groundwater, vapor intrusion, and soil. These standardized procedures should reduce costs and simplify the process for case closure allowing available funds and resources to be directed to higher threat sites.