Practice for Passive Soil Gas Sampling in the Vadose Zone for Source Identification, Spatial Variability Assessment, Monitoring, and Vapor Intrusion Evaluations

10.1520/d7758 ◽  
2015 ◽  
Author(s):  
Keyword(s):  
Spatial Variability ◽  
Vadose Zone ◽  
Source Identification ◽  
Soil Gas ◽  
Vapor Intrusion ◽  
Gas Sampling ◽  
Soil Gas Sampling

Development of a technically defensible soil gas sampling strategy for vapour intrusion assessments

2009 ◽  
Vol 46 (1) ◽  
pp. 102-113 ◽  
Author(s):  
Tai T. Wong ◽  
John G. Agar
Keyword(s):  
Human Health Risk ◽  
Sampling Strategy ◽  
Soil Gas ◽  
Assessment Process ◽  
Soil Conditions ◽  
Gas Monitoring ◽  
Gas Sampling ◽  
Monitoring Well ◽  
Sampling Procedures ◽  
Soil Gas Sampling

Soil vapour intrusion is now commonly evaluated as part of human health risk assessments at contaminated sites where buildings or other structures are located in close proximity to volatile organic chemicals (VOCs) in subsurface soils and groundwater. Investigation of the vapour intrusion pathway often requires that VOC concentrations in the soil gas adjacent to buildings and structures be characterized as part of the risk assessment process. This paper presents the design of a new soil gas monitoring well and a sampling procedure that effectively eliminate concerns about soil gas sample dilution due to short-circuiting of atmospheric air and help to ensure the collection of representative soil gas samples. The results of a parametric numerical modelling study that was applied to address the air short-circuiting issue and the technical rationale for the new soil gas monitoring well (SGMW) design are presented in this paper along with recommended soil gas sampling procedures in various soil conditions. The SGMW design rationale and methodology outlined in this paper considered the effects of soil moisture content and permeability, the depth to the sampling screen interval, and the soil gas sample extraction rate.

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