Evaluation of site-specific lateral inclusion zone for vapor intrusion based on an analytical approach

JOURNAL OF HAZARDOUS MATERIALS

卷:298

Article

Yao, Yijun^1,2  Wu, Yun^1,2  Tang, Mengling^1,2  Wang, Yue³  Wang, Jianjin¹  Suuberg, Eric M.⁴  Jiang, Lin⁵  Liu, Jing³ 

[1] Zhejiang Univ, Coll Environm & Resource Sci, MOE Key Lab Environm Remediat & Ecosyst Hlth, Hangzhou 310058, Zhejiang, Peoples R China

[2] Zhejiang Univ, Res Ctr Air Pollut & Hlth, Hangzhou 310058, Zhejiang, Peoples R China

[3] Zhejiang Univ, Inst Environm Sci, Hangzhou 310058, Zhejiang, Peoples R China

[4] Brown Univ, Sch Engn, Providence, RI 02912 USA

[5] Being Municipal Res Inst Environm Protect, Beijing 100037, Peoples R China

关键词: Vapor intrusion;    Lateral inclusion zone;    Analytical approach;    Surface cover;    Layering;   

DOI  :  10.1016/j.jhazmat.2015.05.024

来源: Elsevier

【 摘 要 】

In 2002, U.S. EPA proposed a general buffer zone of approximately 100 feet (30 m) laterally to determine which buildings to include in vapor intrusion (VI) investigations. However, this screening distance can be threatened by factors such as extensive surface pavements. Under such circumstances, EPA recommended investigating soil vapor migration distance on a site-specific basis. To serve this purpose, we present an analytical model (AAMLPH) as an alternative to estimate lateral VI screening distances at chlorinated compound-contaminated sites. Based on a previously introduced model (AAML), AAMLPH is developed by considering the effects of impervious surface cover and soil geology heterogeneities, providing predictions consistent with the three-dimensional (3-D) numerical simulated results. By employing risk-based and contribution-based screening levels of subslab concentrations (50 and 500 mu g/m(3), respectively) and source-to-subslab attenuation factor (0.001 and 0.01, respectively), AAMLPH suggests that buildings greater than 30 m from a plume boundary can still be affected by VI in the presence of any two of the three factors, which are high source vapor concentration, shallow source and significant surface cover. This finding justifies the concern that EPA has expressed about the application of the 30 m lateral separation distance in the presence of physical barriers (e.g., asphalt covers or ice) at the ground surface. (C) 2015 Elsevier B.V. All rights reserved.

【 授权许可】

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