MIP (Memberane Interface Probe)
Standard Operating Procedure

The Membrane Interface Probe(MIP) is advanced using a standard string of 1.25" or 1.5" rods and a direct push probing unit. Before advancing the probe, the tubing which houses the carrier gas and conductivity cable is connected to the MIP tool and is strung through the probe rod. The rods are then loaded on a rod cart or fixed tool rack for easy dispensing and storage. As the probe is driven to depth, the advancement is stopped at desired intervals (typically six inches) to gather VOC data. Conductivity logging data is gathered on a continuous basis. At the desired intervals, the permeable membrane interface on the wall of the probe is heated. Any VOCs that are exposed to the membrane are volatized and picked up by the carrier gas behind the membrane which in turn delivers the gas the Gas Chromatograph detectors at the surface, typically and ECD, PID and/or FID. A stringpot, which is mounted on the probe, senses movement of the probe and measures depth and speed. The data is stored in spreadsheet compatible format for later graphing and analysis. The Gas Chromatograph readings provide total VOC readings and are stored as well for plotting.

MIP with GC/MS