Project 7: Low Concentration Vapor Exposures in Complex Systems and the Problem

该项目关注的是决定人类暴露可能性的一个方面的因素， 被污染的场地。重点是蒸汽吸入潜力。该项目涉及一个综合实验 和建模研究，并特别强调混合物以及这些混合物如何影响暴露 流程.该研究的建模部分涉及进一步开发和验证三维 计算流体动力学模型，包括许多变量，可以发挥作用， 确定暴露。早期的蒸汽侵入模型通常涉及简单的一维 这是对现象的描述，不足以描述实地的实际情况。 同样，我们感兴趣的是检查已经在有限程度上探索过的瞬时效应， 这样的模型。这里的目的是提供一个强大的工具，基于商业计算平台， 将允许监管机构和其他有关各方访问建模结果，允许更有效地 指导现场调查和补救工作。该计划的这一部分将涉及密切 与我们的国家机构合作伙伴合作，提供新的详细网站描述 模型验证所需的信息。与此同时，我们将继续进行一项实验性检查， 许多因素在确定混合环境中的蒸汽浓度方面起着重要作用。 对于这种系统，还将检查实际土壤基质不同部分的影响（例如，黑色 碳、腐殖酸、水分、其它自由相NAPL）。 本项目的具体目标： 1.获得与蒸汽暴露情景相关的SVOC混合物的新实验数据。 2.继续开发一个可靠的蒸汽侵入现象三维模型，包括 瞬变效应、复杂的地质、生物降解和分配。 3.实验探索黑碳，土壤，水分， 国家水方案/国家水方案作为上述第2段中模型的输入。 4.与州伙伴合作，用真实的现场数据验证建模方法，并建立模型 作为一种监管工具。

This project is concerned with the factors that determine one aspect of human exposure potentials on contaminated sites. The focus is on vapor inhalation potential. The project involves a combined experimental and modeling study, and has a particular emphasis on mixtures and how these influence the exposure processes. The modeling portion of the study involves further development and validation of a threedimensional computational fluid dynamics model that includes the many variables that can play a role in determining exposures. Earlier models of vapor intrusion have often involved simple one-dimensional descriptions of the phenomenon, and are not adequate for describing the actual situation in the field. Likewise, we are interested in examining transient effects that have been explored to a limited degree in such models. The aim here is to provide a robust tool, based on a commercial computational platform, that will allow regulators and other concerned parties access to modeling results, permitting more effective guiding of site investigation and remediation efforts. This portion of the program will involve close collaboration with our state agency partners, in providing access to new detailed site characterization information necessary for model validation. At the same time, we will continue an experimental examination of many of the factors that play an important role in determining vapor concentrations in mixed environments. The influence of different parts of the actual soil matrix will also be examined for such systems (e.g., black carbons, humic acids, moisture, other free-phase NAPLs). Specific Aims of this project: 1. To obtain new experimental data on SVOC mixtures of relevance in vapor exposure scenarios. 2. To continue to develop a robust 3-dimensional model of the vapor intrusion phenomenon, including transient effects, complicated geologies, biodegradation and partitioning. 3. Experimentally explore the partitioning of vapors in the subsurface on black carbon, soil, moisture, NAPL/NAPS as an input to the model in 2 above. 4. Work with state partners to validate the modeling approach with real field data, and make the model available to them as a regulatory tool.