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

这个项目关注的是决定人类暴露在 受污染的场地。重点放在蒸汽吸入潜力上。该项目包括一项综合实验 和模型研究，并特别强调混合物以及这些混合物如何影响曝光 流程。这项研究的建模部分涉及进一步开发和验证三维 计算流体力学模型，包括可在以下方面发挥作用的许多变量 确定曝光量。早期的蒸汽侵入模型通常包括简单的一维 对这一现象的描述，不足以描述实地的实际情况。 同样，我们对研究瞬变效应感兴趣，在 这样的模特。这里的目标是提供一个基于商业计算平台的强大工具，该工具 将允许监管机构和其他相关方获得建模结果，从而允许更有效 指导现场勘察和修复工作。该计划的这一部分将涉及Close 与我们的州机构合作伙伴合作，提供访问新的详细网站特征的途径 模型验证所需的信息。同时，我们将继续进行实验考试 在确定混合环境中的蒸汽浓度方面起着重要作用的许多因素。 还将检查实际土壤基质的不同部分对这样的系统(例如黑色)的影响 碳、腐植酸、水分、其他游离相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.继续开发蒸气侵入现象的强大三维模型，包括 瞬变效应、复杂地质、生物降解和分配。 3.实验探索地下水蒸气在黑碳、土壤、水分、 NAPL/NAP作为上述2中模型的输入。 4.与国家合作伙伴合作，用真实的现场数据验证建模方法，并制作模型 可作为一种监管工具提供给他们。

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.