Thermal NSZD: GSI Start-Up Rolls Out New Technology for Remote Monitoring of Petroleum Impacts on Soil and Groundwater


In cooperation with researchers at Colorado State University, GSI is introducing a new technology that uses soil temperature to measure the rate at which natural biodegradation destroys petroleum contaminants in soil or groundwater.  Subsurface thermocouples measure the temperature increase associated with biodegradation processes and transmit these 3D temperature data to a webpage that continuously calculates the natural loss of petroleum mass.  Measured rates of petroleum destruction by the process termed “Natural Source Zone Depletion” (NSZD) range from 100s to 1000s of gallons per acre per year. At some sites, measured NSZD rates show natural biodegradation to be more effective and economical than conventional recovery and/or in-situ treatment systems.  To support this technology, GSI has developed the Thermal NSZD Dashboard, a secure, user-friendly web interface that provides real-time biodegradation rates for your site. The Dashboard tracks the progress of NSZD on a daily basis and provides customized, site-specific data outputs that can be inserted directly into site reports.

This map identifies locations across the U.S. with sites where: i) thermal monitoring has been implemented, ii) is currently in design, or iii) has used either thermal monitoring or some other NSZD method to obtain site closure or discontinue active remediation.

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Key GSI team members include: Poonam Kulkarni, P.E., Charles Newell, Ph.D., P.E., Kenneth Walker, P.E., Greggory Marquardt, John Connor, P.E., BCEE, and Travis McGuire, P.E.

For more information about Thermal NSZD or to request a subscription to the Dashboard service, please call 281-833-9195 or email Poonam Kulkarni at This email address is being protected from spambots. You need JavaScript enabled to view it. or Kenneth Walker at This email address is being protected from spambots. You need JavaScript enabled to view it.