GSI Environmental Inc., Austin, TX, United States.
GSI Environmental Inc., Houston, TX, United States.
Sci Total Environ. 2020 Jan 1;698:134283. doi: 10.1016/j.scitotenv.2019.134283. Epub 2019 Sep 4.
The role of sewer lines as preferential pathways for vapor intrusion is poorly understood. As a result, these pathways are often not considered when developing vapor intrusion investigation or mitigation plans. Neglecting this pathway can complicate data interpretation, which can result in repeated, and potentially unnecessary, rounds of sampling. Although a number of recent studies have highlighted the importance of sewers as preferential pathways at individual buildings, there is currently little specific technical or regulatory guidance on how to address it. The purpose of our study, therefore, was to conduct systematic testing to better understand the sewer vapor intrusion conceptual model. Through sampling at >30 different sites, the degree of interaction between impacted groundwater and the sewer lines were identified as the main factor when determining the degree of risk for sewer vapor intrusion at a given site. Higher risk sites are those with direct interaction between the subsurface volatile organic compound (VOC) source, such as groundwater, and the sewer line itself. This information can be used to prioritize sites and buildings to test for this particular exposure pathway.
污水管道作为蒸气侵入的优先途径的作用还没有得到很好的理解。因此，在制定蒸气侵入调查或缓解计划时，往往不考虑这些途径。忽视这条途径会使数据解释复杂化，从而导致重复，并且可能不必要的采样。尽管最近有许多研究强调了污水在个别建筑物中作为优先途径的重要性，但目前关于如何解决这一问题的具体技术或监管指导还很少。因此，我们的研究目的是进行系统测试，以更好地了解污水蒸气侵入的概念模型。通过对 30 多个不同地点的采样，确定了受影响地下水与污水管道之间的相互作用程度，这是确定给定地点污水蒸气侵入风险程度的主要因素。风险较高的地点是那些地下挥发性有机化合物（VOC）源，如地下水，与污水管道本身直接相互作用的地点。这些信息可用于对特定暴露途径进行测试的地点和建筑物进行优先级排序。
