Near-Surface Geochemistry – Near-surface geochemistry methods can be used to detect shortterm rapid loss or long-term intermittent leakage of CO2 from GS formations. These techniques are routinely employed in the environmental consulting industry and include monitoring soil gas and shallow groundwater. In general, both consist of purging the monitoring point and collecting a sample, followed by analysis and interpretation. Soil gas can be collected with sorbents, sample tubes, or Tedlar bags, depending on the compounds expected and the detection level. Groundwater samples are collected in laboratory glassware. Soil gas and groundwater monitoring for various tracers has been used in several Core R&D projects. Natural tracers (isotopes of carbon [C], O, hydrogen [H], and noble gases associated.
