Soil-Gas Vapour Sampling

Soil-Gas Vapour samples are collected to characterise the nature and extent of vapour contamination in the soil in a given area.  They are normally collected before sub-slab vapour and/or indoor air samples to help identify buildings or groups of buildings that need to be sampled.  Soil vapour samples are used to determine the potential for human exposure.  The demand for soil gas sampling is increasing dramatically across the UK as it gains regulatory attention.

When evaluating the potential for a soils vapour intrusion at a particular site, it is useful to collect soil-gas samples to evaluate whether volatile contaminants are migrating into the sub-surface and further into the indoor environment.

Applications include:

• Retail Petroleum
• Landfills
• Fuel Storage and Refineries
• Airports
• Solvent Manufacturing
• Military Sites

Through the combination of the Entech Soil Gas Sample Train and Silonite coated MiniCans, soil-gas sampling can be undertaken effectively with minimal effort and operational expertise.

Laboratory analysis of the sampled whole air or soil-gas once collected can be undertaken with the Entech 7410 10-Position Autosampler and 7150 Pre-Concentration System.

Method detection limits for a TO15 77-compound standard are routinely achieved at sub-ppb levels when the Entech equipment is combined with a sensitive mass selective detector (MSD) in full scan mode.
 

Sub-Slab Vapour Sampling

Sub-Slab vapours are collected to characterise the nature and extent of vapour contamination in soil directly beneath a building erected with basement foundations or on a slab.  Sub-Slab vapour results are used to determine the potential for current or future human exposure.

When performing sub-slab analysis, determination of the outside contamination can be crucial to evaluating the true sub-slab composition.  Entech provides a new sub-slab fitting which does not require grouting in place before sampling, which significantly reduces the time required on site.