Shallow-Probe Soil-Gas Sampling for Indication of Ground-Water Contamination by Chloroform

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Abstract
Soil-gas sampling and analysis for indication of ground-water contamination by chloroform was field tested. The field testing included evaluation of: The repeatability of results, the correlation of results of soil-gas analyses with ground-water concentrations, the differences in results among closely spaced samples and the depth profile of chloroform concentrations in soil-gas samples. The sampling probe gave good repeatability, although leakage of sample from syringes between sampling and analysis is postulated as a reason for variability in results. Soil-gas concentrations correlated with ground-water data at a level above 95% significance. Short-range variability of results ranged from 12% to 43% over 2 meters with leakage of sample from syringes postulated as a reason for the higher variability. A depth-dependence of the chloroform concentration consistent with a vertical transport mechanism of gasphase diffusion was observed.

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