Investigating two-dimensional soil gas transport of trichloroethylene in vapor intrusion scenarios involving surface pavements using a pilot-scale tank

JOURNAL OF HAZARDOUS MATERIALS

卷:371

Article

Wang, Genfu¹  Ma, Shuaishuai^1,2  Strom, Jonathan³  Suuberg, Eric³  Yao, Yijun³  Zeng, Lingzao¹ 

[1] Zhejiang Univ, Coll Environm & Resource Sci, Hangzhou 310058, Zhejiang, Peoples R China

[2] Shanghai SUS Environm Co LTD, Shanghai 201703, Peoples R China

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

关键词: Vapor intrusion;    Pilot-scale tank;    Two-dimensional transport;    Surface pavements;    Exterior soil gas sample;   

DOI  :  10.1016/j.jhazmat.2019.02.069

来源: Elsevier

【 摘 要 】

In this study, we investigate the soil gas concentration attenuation with diffusive transport in lateral and vertical transport in cases with surface pavements with a pilot-scale tank. Three scenarios were investigated, one with a completely open soil surface and the other two involving partially paved soil surface. The results, on the one hand, indicate that the soil gas concentration generally decreases linearly and exponentially in the vertical and horizontal transport directions, respectively, generally in accordance with available modeling studies. On the other hand, our experiment shows that low-permeability ground covers can increase shallow soil gas concentrations beneath the pavement by at most 3-4 times, inducing higher subslab concentration than that below open ground surface, even if the latter is obtained at a closer location to vapor source. For cases with uniform soil properties, our study suggests exterior soil gas sample should be taken at a depth below the building foundation by half of the building footprint size, if the vapor source is laterally extensive relative to the building footprint, or by 1 m and 2-3 rn for slab-on-grade and basement scenarios, respectively, if the vapor source is located laterally away from the building.

【 授权许可】

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