Membrane Interface Probe

On a recent environmental subsurface exploration job in the heart of downtown Atlanta, Geo-Hydro used a Membrane Interface Probe (MIP) to monitor soil contaminates.  The MIP has the ability to measure soil contaminates in real time as the probe is pushed down through the soil.  The probe is a semi-permeable membrane incased in a stainless steel screen.  The screen is heated to accelerate diffusion of volatile organic compounds as it is advanced into the soil. As contaminates found in the soil volatilize, they pass through the membrane and are carried to the detection device by a carrier gas.  A log is produced with detection levels shown at their respective depths in the soil.  Geo-Hydro utilized this device and took confirmation samples when spikes of contaminants were found.  Below are pictures.