Liner Integrity Services: Team

Technical Sales


Abigail Gilson, Director of Liner Integrity Services | +1 512 263 5944

Abigail Gilson, M.S., P.E., is the Director of TRI Environmental’s Liner Integrity Services. She has a wealth of experience in geomembrane-lined containment facility design and construction and has performed liner integrity surveys since 2004. As a graduate of TRI’s inaugural liner integrity survey class in 2003, her liner integrity and leak location field experience has exceeded 180 million square feet and well over 100 projects. Her contribution to the field of electrical leak location includes numerous published technical papers, educational seminars, presentations world-wide, and chairing the ASTM committee for the recent revisions and additions to the ASTM Standard Guide and Practices.


“The Value of Geoelectric Leak Detection Services for the Mining Industry”, Geofrontiers Conference Proceedings, 2005.

“Designing for Vertical Pipe Deflection Under High Loads”, NAGS/GRI-19 Conference Proceedings, 2005.

“Modern Technology for a Leak-Free Leach Pad”, The Mining Record, March 2006.

“A Comparison of Geoelectric Survey Methods for Heap Leach Applications”, Latin America Mining Record, March/April 2006.

“Comparación de Métodos de Detección Geoeléctrica de fugas para aplicaciones en lixiviación”, Ecoamerica Directorio Provedores Minería, 2006.

“In Search of the Electric Limit of Geosynthetic Clay Liners”, The Mining Record, 2008.

“Specifications for Moisture Content of GCL to Perform Electrical Leak Location Surveys”, EuroGeo4, 2008.

“Electrical Leak Location Surveys for Landfill Caps”, Proceedings of the Environmental and Water Resources Institute conference, Bangkok, Thailand, 2009.

“Advancements in Leak Location Technologies for the Control of Geomembranes”, Proceedings of the Environmental and Water Resources Institute conference, Bangkok, Thailand, 2009.

“Design Considerations for the Use of Geomembranes for Phosphate Tailing Impoundments”, Covaphos3, 2009.

“Technical Improvements in Dipole Geoelectric Survey Methods”, Geo-Frontiers Congress, March 2011.

“Case Histories of Exposed Geomembrane Performance”, Geosynthetics Magazine, June/July 2011.

“A Statistical Approach to Minimizing Landfill Leakage”, SWANA, Washington D.C. Conference Proceedings, 2012.

“More Accurate Liner Integrity Surveys Using Electrically Conductive Geomembrane”, Geosynthetics Magazine, October 2012.

“How Much Does my Landfill Leak?” Waste Advantage Magazine, December, 2012.

“Leak Location Liner Performance Evaluation”, GeoSynthetics2013 Conference Proceedings, 2013.

“Measuring a giant one step at a time”, Geosynthetics Magazine, April 2013.

“Electrical Leak Location Arc Tester to Revolutionize Liner Quality”,, July 2013.

“Designing to Minimize Geomembrane Leakage”, Geosynthetics Magazine, August 2014.

“The Financial Benefit of Electrical Leak Location to the Mining Industry”, Geosynthetics Mining Solutions Conference Proceedings, Vancouver, Canada, September 8-11, 2014.

“Maximizing Productivity in Heap Leach Pads through Dipole Electrical Leak Location”, Geosynthetics Mining Solutions Conference Proceedings, Vancouver, Canada, September 8-11, 2014.

“Inspeção de Integridade de Liners com Localização Geoelétrica de Furos em Geomembranas: Uma Solução Efetica Para Evitar Contaminações Ambientais e Prejuízos Financeiros”, Fundações & Obras Geotécnicas, 2014, pp 60-63.

“Leak Detection for Optimum Geomembrane Performance”, 7th International Congress on Environmental Geotechnics Conference Proceedings, Melbourne, Australia, November 10-14, 2014.

“Technologies for Reducing the Risk of Landfill Leakage”, Global Waste Management Symposium, Orlando, Florida, June 22-25, 2014.

“Available Technologies to Approach Zero Leaks”, Geosynthetics 2015 Conference Proceedings, Portland, Oregon, February 15-18, 2015.

“Electrical Leak Location Sensitivity Explored”,, March 19, 2015.

“Best Practices for Groundwater Protection”, GeoAmericas 2016 Conference Proceedings, Miami Beach, Florida, April 10-13, 2016.

“Optimizing Geomembrane Performance”, Land and Water Magazine, November/December 2015.

“CCR Barrier Systems: Mitigating Risk from Leakage with Proven Advanced Technologies”, World of Coal Ash Conference, May 2017.

“Achieving Zero Leaks on a Budget”, Geosynthetics Magazine, June 2017.

“Maximizing the Effectiveness of Electrical Leak Location for Covered Geomembranes”, Geosynthetics 2017, First International Conference on Technology and Application of Geosynthetics, 18-20 October, 2017.

“Electrical Leak Location Testing for Zero Leak Verification”, IFAI Geosynthetics Conference Proceedings, Houston, TX , February 10-13, 2019.

“Controlling leakage through installed geomembranes using electrical leak location”, Geotextiles and Geomembranes, In Press.


Nadia Minnaar, Geomembrane Specialist | +27 79 875 5691​

Nadia Minnaar, TRI Africa began in 2018 through TRI Africa’s Managing Director Nadia Minnaar. Ms. Minnaar started training with Ms. Gilson in 2014. Ms. Minnaar’s survey experience encompassed over 700 000 m² of covered geomembrane surveys in Africa and North America. Ms. Minnaar’s ELL experience is currently unrivaled on the African continent