Vapor intrusion attenuation factors relative to subslab and source, reconsidered in light of background data

JOURNAL OF HAZARDOUS MATERIALS

卷:286

Article

Yao, Yijun^1,2,3  Wu, Yun^1,2,3  Suuberg, Eric M.⁴  Shen, Rui⁵  Ma, Jianqing^1,2,3  Liu, Jing^1,2,3 

[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] Halliburton Energy Serv Inc, Houston, TX 77032 USA

关键词: Vapor intrusion;    Attenuation factors;    Background concentration;    Subslab concentration;    EPA database;   

DOI  :  10.1016/j.jhazmat.2015.01.013

来源: Elsevier

【 摘 要 】

The basis upon which recommended attenuation factors for vapor intrusion (VI) have been derived are reconsidered. By making a fitting curve to the plot showing the dependence of observed indoor air concentration (c(in)) on subslab concentration (c(ss)) for residences in EPA database, an analytical equation is obtained to identify the relationship among c(in), c(ss) and the averaged background level. The new relationship indicates that subslab measurements may serve as a useful guide only if c(ss) is above 500 mu g/m(3). Otherwise, c(in) is independent of c(ss), with a distribution in good agreements with other studies of background levels. Therefore, employing this screening value (500 mu g/m(3)), new contaminant concentration attenuation factors are proposed for VI, and the values for groundwater-to-indoor and subslab-to-indoor air concentration attenuation factors are 0.004 and 0.02, respectively. The former is applied to examining the reported temporal variations of c(in) obtained during a long-term monitoring study. The results show that using this new groundwater-to-indoor air concentration attenuation factor also provides a reasonably conservative estimate of c(in). (C) 2015 Elsevier B.V. All rights reserved.

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