CPT/MIP

CPT/MIP application combines in-situ geologic and real-time screening data to evaluate the presence and distribution of dissolved phase volatile organic compounds (VOCs). The MIP technology uses a down-hole sensor mounted on CPT probe to characterize stratigraphy and to provide continuous in-situ screening for VOCs and detect their relative concentration.

The MIP probe heats and volatilizes VOCs in the groundwater, which diffuse across a hydrophobic membrane and are swept by a carrier gas to a series of detectors located in the CPT rig. The typical detectors are photo ionized detector (PID), flame ionized detector (FID), electron capture detector (ECD), and dry electrolytic conductivity detector (DELCD).

SMA begins CPT/MIP investigations by advancing borings adjacent to monitoring wells with existing groundwater analytical data to develop a correlation between the MIP results and the total VOC concentration. Upon completion of the investigation, SMA prepares cross sections showing the electrical conductivity results to identify the water-bearing zones, and displays the PID/FID/ECD data as well as groundwater sample results at each boring location. This information is also used to prepare isoconcentration maps to show the extent of the dissolved phase plume.