Investigating the Role of Soil Texture in Petroleum Vapor Intrusion

被引:4
作者
Yao, Yijun [1 ,2 ,3 ]
Mao, Fang [1 ,2 ,3 ]
Xiao, Yuting [1 ,2 ,3 ]
Chen, Huanyu [4 ]
Verginelli, Iason [5 ]
Luo, Jian [6 ]
机构
[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 Hlth, Hangzhou 310058, Zhejiang, Peoples R China
[4] Northeast Elect Power Design Inst Co, China Power Engieering Consulting Grp, Changchun 130051, Jilin, Peoples R China
[5] Univ Roma Tor Vergata, Lab Environm Engn, Dep Civil Engn & Comp Sci Engn, Via Politecn, I-100133 Rome, Italy
[6] Georgia Inst Technol, Sch Civil & Environm Engn, Atlanta, GA 30332 USA
基金
中国国家自然科学基金;
关键词
CONTAMINANT SUBSLAB CONCENTRATION; BIODEGRADATION; BUILDINGS; ZONE; MODELS; FIELD;
D O I
10.2134/jeq2018.04.0140
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
In this work we investigate the role of soil texture in petroleum vapor intrusion (PVI) by performing numerical modeling, analytical calculations, and statistical analysis of the USEPA's PVI database. Numerical simulations were conducted for three kinds of soil (sand, sandy loam, and clay), and the results indicate that the maximum attenuations of vapor concentrations from source to indoor air were observed when the clay soil is below the building. In the anaerobic zone, the normalized soil gas concentration profiles were observed to be similar and independent of soil type, whereas in the aerobic zone, a more significant attenuation was observed in finer grained soils. Such a finding is consistent with the statistical results of the USEPA's PVI database, which indicate that in the near-source zone, the soil gas concentration in coarse-grained soil tends to be lower than that in fine- grained soil, possibly caused by a weaker source due to mass loss by volatilization, whereas at a distance away from the source, the measured soil gas concentrations in fine- grained soils become much lower because of aerobic biodegradation with a shorter diffusive reaction length. Thus, 3 and 5 m are proposed as soil-type-dependent vertical screening distances for fine and coarse-grained soils, respectively. It should be noted that the validity of these screening distances is examined only for relatively homogeneous soils, and they may not be applicable for cases involving layered soil systems, where the availability of O 2 in the subfoundation should be evaluated with subslab or multidepth samples to confirm the presence of aerobic biodegradation.
引用
收藏
页码:1179 / 1185
页数:7
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