passive soil gas accumulation modules and associated chemical analytical services, usually employing gas chromatography and mass spectrometry-modules are typically used in petroleum drilling surveys, environmental clean-up sites, and detection of low level contaminants in buildings

'accumul':4 'analyt':9 'associ':7 'build':39 'chemic':8 'chromatographi':14 'clean':29 'clean-up':28 'contamin':37 'detect':33 'drill':25 'employ':12 'environment':27 'gas':3,13 'level':36 'low':35 'mass':16 'modul':5,19 'passiv':1 'petroleum':24 'servic':10 'site':31 'soil':2 'spectrometri':18 'spectrometry-modul':17 'survey':26 'typic':21 'use':22 'usual':11

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