Practice for Active Soil Gas Sampling for Direct Push or Manual-Driven Hand-Sampling Equipment

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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A rainfall event may produce a biased estimation of the indoor vapor intrusion risk through exterior soil-gas sampling

Journal of Hydrology ◽

10.1016/j.jhydrol.2021.127117 ◽

2021 ◽

pp. 127117

Author(s):

Xin Yang ◽

Chunhui Lu ◽

Xinran Huang ◽

Jian Luo

Keyword(s):

Rainfall Event ◽

Soil Gas ◽

Vapor Intrusion ◽

Biased Estimation ◽

Gas Sampling ◽

Soil Gas Sampling

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A COMPARISON OF SOIL-GAS SAMPLING METHODS USED AT TWO HARBOR SITES

International Oil Spill Conference Proceedings ◽

10.7901/2169-3358-1987-1-605 ◽

1987 ◽

Vol 1987 (1) ◽

pp. 605-610

Author(s):

Victor H. Owens ◽

Walter J. Sexton ◽

Jacqueline Michel

Keyword(s):

Sampling Methods ◽

Oil Spills ◽

Extraction Methods ◽

Diesel Oil ◽

Soil Gas ◽

Gas Extraction ◽

Adsorption Method ◽

Gas Sampling ◽

Soil Gas Sampling ◽

Component Adsorption

ABSTRACT Underground oil spills leaking into navigable waterways at Baltimore, Maryland, and Hilo, Hawaii, were investigated using soil-gas sampling methods. Gas extraction methods were used in Hilo with mixed but favorable results. Component adsorption methods were used in Baltimore with highly favorable results. In comparing the two soil-gas sampling methods and results, the component adsorption method was found to be superior in detecting the presence or absence of underground diesel oil. The gas extraction method produced results that were somewhat limited in use because of lack of sensitivity to the components of diesel oil. Interpretation of data from both methods was found to be complicated by the presence of surface spill contamination leading to false indications of underground oil.

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