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Estimation of Generic Subslab Attenuation Factors for Vapor Intrusion Investigations

机译：蒸汽入侵调查的通用底板衰减因子的估计

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摘要

Generic indoor air:subslab soil gas attenuation factors (SSAFs) are important for rapid screening of potential vapor intrusion risks in buildings that overlie soil and groundwater contaminated with volatile chemicals. Insufficiently conservative SSAFs can allow high-risk sites to be prematurely excluded from further investigation. Excessively conservative SSAFs can lead to costly, time-consuming, and often inconclusive actions at an inordinate number of low-risk sites. This paper reviews two of the most commonly used approaches to develop SSAFs: (1) comparison of paired, indoor air and subslab soil gas data in empirical databases and (2) comparison of estimated subslab vapor entry rates and indoor air exchange rates (IAERs). Potential error associated with databases includes interference from indoor and outdoor sources, reliance on data from basements, and seasonal variability. Heterogeneity in subsurface vapor plumes combined with uncertainty regarding vapor entry points calls into question the representativeness of limited subslab data and diminishes the technical defensibility of SSAFs extracted from databases. The use of reasonably conservative vapor entry rates and IAERs offers a more technically defensible approach for the development of generic SSAF values for screening. Consideration of seasonal variability in building leakage rates, air exchange rates, and interpolated vapor entry rates allows for the development of generic SSAFs at both local and regional scales. Limitations include applicability of the default IAERs and vapor entry rates to site-specific vapor intrusion investigations and uncertainty regarding applicability of generic SSAFs to assess potential short-term (e.g., intraday) variability of impacts to indoor air.
机译：普通室内空气：平板土壤气体衰减因子（SSAF）对于快速筛查覆盖有挥发性化学物质污染的土壤和地下水的建筑物中潜在的蒸汽入侵风险非常重要。保守的SSAF不足会导致高风险部位过早地被排除在进一步调查之外。过于保守的SSAF可能会在数量众多的低风险站点中导致代价高昂，耗时且通常没有结果的行动。本文概述了开发SSAF的两种最常用方法：（1）比较经验数据库中室内空气和地下平板土壤的配对数据，以及（2）估计地下平板蒸气进入速率和室内空气交换速率（IAER）的比较。与数据库相关的潜在错误包括室内和室外来源的干扰，对地下室数据的依赖以及季节性变化。地下蒸气羽流的异质性与蒸气进入点的不确定性相结合，质疑了有限的地下平板数据的代表性，并降低了从数据库中提取的SSAF的技术防御力。合理保守的蒸气进入速率和IAER的使用为开发用于筛选的通用SSAF值提供了更具技术上辩护的方法。考虑建筑物泄漏率，空气交换率和内插蒸气进入率的季节性变化，可以在地方和区域范围内开发通用SSAF。局限性包括默认IAER的适用性和蒸​​气进入速率对特定地点的蒸气入侵调查的适用性，以及通用SSAF的适用性不确定性，以评估室内空气影响的短期（例如日内）潜在变化性。

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  • 来源
    《Ground Water Monitoring & Remediation》 |2014年第4期|79-92|共14页
  • 作者

    Roger Brewer; Josh Nagashima; Mark Rigby; Martin Schmidt; Harry ONeill;

  • 作者单位

    Hawaii Department of Health, 919 Ala Moana Blvd., Room 206, Honolulu, HI 96814;

    Hawaii Department of Health, 919 Ala Moana Blvd., Room 206, Honolulu, HI 96814;

    Parsons Corporation, 10235 South Jordan Gateway, Suite 300, South Jordan, UT 84095, Marine Science Institute and the Department of Ecology, Evolution, and Marine Biology, University of California, Santa Barbara, CA 93106;

    Cox-Colvin and Associates, Inc., 7750 Corporate Blvd, Plain City, OH 43064;

    Beacon Environmental Services, Inc., 2203A Commerce Road, Suite 1, Forest Hill, MD 21050;

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