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A Case Study Of Soil-gas Sampling In Silt And Clay-rich (low-permeability) Soils

机译：淤泥和黏土（低渗透性）土壤中土壤气采样的案例研究

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摘要

Soil-gas sampling and analysis is a common tool used in vapor intrusion assessments; however, sample collection becomes more difficult in fine-grained, low-permeability soils because of limitations on the flow rate that can be sustained during purging and sampling. This affects the time required to extract sufficient volume to satisfy purging and sampling requirements. The soil-gas probe tubing or pipe and sandpack around the probe screen should generally be purged prior to sampling. After purging, additional soil gas must be extracted for chemical analysis, which may include field screening, laboratory analysis, occasional duplicate samples, or analysis for more than one analytical method (e.g., volatile organic compounds and semivolatile organic compounds). At present, most regulatory guidance documents do not distinguish between soil-gas sampling methods that are appropriate for high- or low-permeability soils. This paper discusses permeability influences on soil-gas sample collection and reports data from a case study involving soil-gas sampling from silt and clay-rich soils with moderate to extremely low gas permeability to identify a sampling approach that yields reproducible samples with data quality appropriate for vapor intrusion investigations for a wide range of gas-permeability conditions.
机译：土壤气体采样和分析是蒸气入侵评估中常用的工具。但是，由于在净化和采样过程中可能会限制流速，因此在细粒，低渗透性土壤中采集样品变得更加困难。这会影响提取足够量以满足净化和采样要求所需的时间。通常应在采样前清除探头屏周围的土壤气体探头管或管道和沙袋。吹扫后，必须提取更多的土壤气体进行化学分析，这可能包括现场筛选，实验室分析，偶发重复样品或分析多种分析方法（例如挥发性有机化合物和半挥发性有机化合物）。目前，大多数法规指导文件并未区分适用于高渗透性或低渗透性土壤的土壤-气体采样方法。本文讨论了渗透率对土壤气体样品收集的影响，并报告了一个案例研究的数据，该案例研究涉及从具有中等至极低气体渗透率的粉砂和富含粘土的土壤中进行土壤气体采样，以确定一种可产生可重复采样且数据质量合适的采样方法。用于各种气体渗透条件的蒸汽侵入研究。

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