U.S. EPA Contaminated Site Cleanup Information (CLU-IN)

U.S. Environmental Protection Agency
U.S. EPA Technology Innovation and Field Services Division

Plume Stability Analyses with GWSDAT

Sponsored by: U.S. EPA - Region 9

Archived: Wednesday, September 22, 2021
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The GroundWater Spatiotemporal Data Analysis Tool (GWSDAT) is a user friendly, open source, decision support tool for the analysis and reporting of groundwater monitoring data. Uniquely, GWSDAT applies a spatiotemporal model smoother for a more coherent interpretation of the interaction in spatial and time-series components of groundwater solute concentrations. This provides a more data efficient method for evaluating and determining contaminant plume stability. New in the latest version (v3.1) is the ability to perform well redundancy analysis by allowing the user to drop a well or a combination of wells from the analysis and investigate the resultant impact, including comparison to full dataset. More information and access to this tool can be found at

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It is EPA's policy to make reasonable accommodation to persons with disabilities wishing to participate in the agency's programs and activities, pursuant to the Rehabilitation Act of 1973, 29 U.S.C. 791. Any request for accommodation should be made to Herb Levine at 415-972-3062 or, preferably one week or more in advance of the webinar, so that EPA will have sufficient time to process the request. EPA would welcome specific recommendations from requestors specifying the nature or type of accommodation needed. Please note that CLU-IN provides both alternate phone call-in options and closed captioning for all webinars, and requests for these specific accommodations are not necessary.

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A photograph of Herb LevineHerb Levine, U.S. EPA Region 9 ( or 415-972-3062)
Senior Hydrogeologist with the U.S. EPA, Region 9 Superfund program. Mr. Levine has more than 35 years' experience in this capacity providing in-house consulting to EPA remedial project managers on site investigations and cleanups as well as regulatory issues. Mr. Levine participates on national workgroups advancing technical concepts and developing guidance. Mr. Levine holds an MS and BS in geology from the University of Illinois.

A photograph of Wayne R. Jones, Ph.D.Wayne R. Jones, Ph.D., Principal Data Scientist Shell Global Solutions (U.K.) Ltd, London (
Wayne Jones is a Principal Data Scientist with Shell Global Solutions in the United Kingdom. He has a BSc (Hons) degree in Mathematics from the Bangor University of Wales, a MSc in 'Mathematical Modelling for Industry' from the University of Loughborough and a PhD in Ecological Modelling from the University of Strathclyde. Wayne became a chartered statistician in 2008, and during his 14 years in Shell has worked on a wide variety of projects, including microgrid dispatch optimisation, fuels science, renewables power forecasting and the analysis of environmental monitoring data.

A photograph of Luc Rock, Ph.D.Luc Rock, Ph.D., Soil and Groundwater Scientist Shell Global Solutions International B.V., Netherlands, Rijswijk (
Luc Rock (PhD, P.Geo.) is a Soil and Groundwater Scientist with Shell Global Solutions International B.V. in the Netherlands, supporting different business units. Other roles in Shell included MMV (Measurement, Monitoring and Verification) Coordinator, Hydrogeologist, and Operational Geologist for the Quest CCS (Carbon Capture and Storage) project in Canada. Prior to joining Shell, he worked in academia and a government research laboratory with a focus on understanding the origin and fate of compounds within the environment. He is multi-lingual and his work experiences span different countries.


A photograph of Jean BalentJean Balent, U.S. EPA Technology Innovation and Field Services Division ( or 202-566-0832)
Ms Balent is on the staff of the EPA's Technology Innovation and Field Services Division where she has worked to collect and disseminate hazardous waste remediation and characterization information since 2003. Ms Balent manages the Clean Up Information Network website and actively supports online communication and collaboration resources available to EPA. She formerly worked with the US Army Corps of Engineers Environmental Engineering Division in the Buffalo District. Ms Balent was also a member of the SUNY-Buffalo Groundwater Research Group where she constructed and tested large scale models of groundwater flow. Ms Balent has also conducted research relating to the Great Lakes, environmental remediation, and brownfields re-development. She holds a Bachelor's degree in environmental engineering from SUNY-Buffalo and a Master's degree in Information Technology from AIU.

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If you have a suggested topic or idea for a future CLU-IN internet seminar, please contact:

Jean Balent
Technology Integration and Information Branch

PH: 202-566-0832 | Email:
Michael Adam
Technology Integration and Information Branch

PH: 202-566-0875 | Email: