Case study comparisons of vapor inhalation risk estimates: ASTM RBCA model predictions vs site-specific soil vapor data

摘要

The American Society for Testing and Materials (ASTM) Standard E-1739, Risk- Based Corrective Action Applied at Petroleum Release Sites (RBCA), offers a streamlined methodology for selecting and implementing cost-effective corrective action for petroleum hydrocarbon release sites. ASTM is also currently developing the Standard Guide for Risk Based Corrective Action which extends the RBCA process to include a wide range of chemicals of concern. Comparing the results derived from the RBCA vapor transport models with field data has underscored the extremely conservative nature of the RBCA inhalation pathway models. Two case studies are described in this paper which compare exposure point concentration and human health risk estimated from the RBCA vapor transport models and actual measurements of soil vapor concentrations and soil vapor flux.