Click on image to view larger version.
Fig. 2. Carbon dioxide concentrations and 
13C vs. versus depth for samples from the Subsurface Disposal Area (SDA) and from background wells. The main depth interval of elevated concentrations is between 10 and 30 m (shown shaded). Slightly elevated values occur down to the 75-m depth. Soils from the TEM1 locality and from farther to the west of that locality have particularly high CO2 values within a few meters of the surface. These values require very high local production rates of CO2 (from root respiration).
