All construction and drilling projects require a significant amount of soil and groundwater testing before, during, and after a site is established. Crews now use more efficient and flexible testing methods, such as the membrane interface probe (MIP) , to minimize disruptions. For those unfamiliar with this type of geoprobe, below is a brief introduction.

What It Does

A membrane interface probe is a method of monitoring soil and groundwater for volatile organic compounds (VOCs). This geoprobe can be used as a system of well monitoring as well as construction site analysis.

By reducing the disruption of the surrounding ground, MIPs allow for the detection of potentially harmful VOCs while preserving the integrity of the landscape and avoiding excessive additional pollution.

How the Process Works

A probe with a special membrane that is permeable to gasses but not liquids is driven into the ground. The depth goal is dependent on each site and what metrics are being monitored. The probe has an internal line that is used to extract VOC vapor samples.

The VOC vapor samples are tested with various measuring devices, including:

• FID (Flame Ionization Detector)
• PID (Photo Ionization Detector
• DELCD (Dry Electrolytic Conductivity Detector)

Each testing method analyzes the samples from a different perspective to determine what compounds are present and how they may affect the work pending for the location.

Why It Matters

The overall probing process allows geoscientists to investigate a site and determine whether or not it is suitable for the pending job, whether it is a well installation, drilling for natural oil and natural gas, or testing the soil quality for construction of roads and structures. An MIP geoprobe accomplishes this with as little interference to the site as possible and can be used to monitor for changes. 

When it comes to VOCs, there are many chemical compounds that pose health risks, such as VOC contaminated drinking water. MIP investigation reduces the risk of exposure and is a non-invasive way to test the depth of the water table. 

If you are involved with site cleanup, well testing, or just need a chemical analysis of a piece of property you’re buying, MIP is a clean and efficient solution. GeoTek Alaska is an Anchorage-based geophysical service company with state-of-the-art technology and equipment. They use compact equipment that can access even the most remote location and are environmentally friendly. Call them at (907) 569-5900 or visit their website for more information.