Site Investigation and Remediation
IN Australia
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Geosyntec Services

International leaders, local partners in Australia and New Zealand.

Geosyntec scientists and engineers have pioneered advances in bioaugmentation, vapour intrusion, Self-sustaining Treatment for Active Remediation (STAR), other low-cost in situ environmental technologies, and advances in many other fields. Geosyntec brings advanced remediation solutions to the most challenging sites in Australia and New Zealand through new and existing partnerships with local scientists, engineers, and consulting professionals.

A reliable partner for creative, cost-effective, and successful solutions, we bring a total environmental management approach to remediation, where science, policy, external and internal drivers, and all stakeholders are considered in the development of a best-value outcome for each and every client in each and every project. We set the standard for engineered solutions, scientifically rigourous investigation, and effective risk management.

Services Overview

Geosyntec Consultants is a specialised consulting and engineering firm with offices in Australia that work with clients to solve complex problems.

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Sustainability Remediation

Our technical rigour and solution-focused approaches provide clients with high-value remedies at a competitive cost.

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Electrokinetic-enhanced in situ biological and chemical remediation can be highly effective in low-permeability or heterogeneous systems.

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The PFAS Conundrum

Investigation and management of PFAS sites requires an innovative, adaptable and educated team, involved in (not just aware of) current research, and not tied to a one-size-fits-all approach.

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Bioremediation can solve certain complex groundwater and soil contamination issues at lower costs than competing approaches.

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Vapour Intrusion

For more than 20 years, Geosyntec professionals have pioneered the assessment and management of vapour intrusion through practice and applied research.

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Offering a broad range of sediment management capabilities, we specialise in remedies for sites with contaminated sediments and surface waters.

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Business & Practice News

Geosyntec Professional Co-Authors Articles in Journal of Environmental Management

Geosyntec Consultants is proud to announce its recent contributions to the special issue on sustainable remediation in Journal of Environmental Management. Senior Consultant Garry Smith co-authored the following papers:

Geosyntec has been a consistent supporter of sustainable remediation development in Australia and the Asia Pacific region.  Our personnel have implemented and evaluated SR and GSR approaches at sites worldwide, and co-authored, for example, ITRC and NRC sustainability documents and short courses.

More information on our sustainable remediation capabilities can be found above.

Read the Journal of Environmental management:

Lange Jorstad Elected President of the Australian Chapter of the International Association of Hydrogeologists

Lange Jorstad (Australia) was elected President of the Australian Chapter of the International Association of Hydrogeologists (IAH) at the annual general meeting in November 2016.

The appointment followed over ten years serving in state and national committee roles with IAH Australia. The IAH is a scientific and educational charitable organization for scientists, engineers, water managers and other professionals working in the fields of groundwater resource planning, management and protection. The Australian Chapter is the largest national chapter within the IAH network, and supports the IAH mission through convening conferences, sponsoring local and international lecturers, supporting professional development courses, advocating for sound policy and management of groundwater resources, and providing financial support to groundwater students in developing countries.

For more information regarding the IAH, visit: , and for more information on environmental compliance, contact Lange Jorstad at .

Geosyntec Provides Sustainable Remediation Technology Course to NSW EPA

Geosyntec provided NSW Environment Protection Authority (EPA) a half-day course on the international and local status of the effective and sustainable remediation technology Enhanced In-Situ Biological Remediation. Interest in discussion of this technology has been shown across the remediation industry, including amongst regulators in both environment protection and  land use planning departments.

Geosyntec's provision of free bimonthly webinars on emerging technologies to date for Australian industry practitioners, which commenced in 2014 and are available for retrieval, has included discussion of:

  • Vapour Intrusion
  • Enhanced In Situ Bioremediation
  • SAVRON (smouldering combustion)
  • Sediment Amendments
  • Data Management and Visualisation
  • Treatability Trials (via our subsidiary SiREM Laboratory)
  • In Situ Chemical Oxidation, and
  • Perfluorocarbons. 

For more information, contact Dave Reynolds:

Geosyntec Staff Join ITRC Committee

Geosyntec's Robbie Ettinger, Simone Smith and Olga Stewart have joined the new Interstate Technology and Regulatory Council (ITRC) committee on TPH Risk Evaluation at Petroleum-Contaminated Sites. The ITRC is a United States-based organization which has made major contributions to environmental technologies innovation and to regulation in the U.S. and globally since 1995. ITRC participants include U.S. state and federal regulators, industry representatives, consultants, academia, and other stakeholders.  The committee will review, update and develop guidance on methods and procedures used for evaluating TPH risk and establishing cleanup requirements.

Robbie is known to Australian and Pacific region industry practitioners through his 2014 keynote addresses at EcoForum and his consultations with state regulators regarding complex vapour intrusion projects in Australia.

Robbie, Simone and Olga have technical expertise in TPH and vapour contamination research and remediation and are available to undertake peer review roles for government and industry on Australian projects.

For more information see or contact Dr. Dave Reynolds at

Rula Deeb Appointed to the Science Advisory Board's Environmental Engineering Committee

February 24, 2016

Geosyntec is proud to announce that Rula Deeb was invited to serve as a member of the U.S. EPA Science Advisory Board's Environmental Engineering Committee until September 2018.

Rula is known to Australian and Pacific region industry practitioners due to her 2015 Geosyntec Technologies Webinar Series presentation on perfluorocarbons remediation, and her keynote presentations on emerging contaminants at Battelle conferences. Rula is a recognized international leader in emerging contaminants research and remediation and undertakes peer review roles for government and industry.

Rula Deeb is a Senior Principal Civil and Environmental Engineer with more than 25 years of global experience focused on private practice and academia addressing the cross-media fate and transport of contaminants, and the remediation of complex soil and groundwater sites impacted by non-aqueous phase liquids.


January 12, 2016

Geosyntec, a Gold Sponsor of SuRF ANZ (The Sustainable Remediation Forum of Australia and New Zealand), is a leader in incorporating international sustainability advances and local regulatory requirements into remediation design. In recognition of the growing emphasis on sustainable remediation by Australian and regional regulations, Geosyntec has recently published its Statement of Qualifications which describes our capabilities, expert personnel, and case studies in sustainable remediation

Further information on SuRF ANZ may be found at , and for more information on the development of sustainable remediation, contact Dave Reynolds:

Garry Smith Presents at the 12th International Meeting of the International Committee on Contaminated Land

November 20, 2015

Dr. Garry Smith, Senior Consultant at Geosyntec and Chairman of the Sustainable Remediation Forum of Australia and New Zealand (SuRF ANZ), was invited to give a presentation at the 12th International Meeting of the International Committee on Contaminated Land (ICCL) held in September in Melbourne Australia. Garry's topic was "The Development of Sustainable Remediation in Australia".  Other presentations included Australian and international regulators and industry practitioners from several European states, New Zealand, China, Korea, Africa and North America. 
Sustainable remediation practice information currently is being provided to the remediation industry across Australia and New Zealand by SuRF ANZ through Australasian Land and Groundwater Association state capital city forums.  Geosyntec is a Gold Sponsor of SuRF ANZ.

Further information on the meeting may be found at , and for more information on the development of sustainable remediation, contact Dave Reynolds:

Garry Smith Co-authors Article on Sustainable Remediation Technology Selection for High-Profile Australasian Remediation Industry Magazine

November 5, 2015

Senior Consultant Garry Smith BSc, PhD, MPlan (Sydney) has co-authored an article entitled "Applying Sustainable Remediation Principles in Australasia." Garry's co-author is John Hunt, PhD, a leading Australian remediation contractor working with Ventia. The article is the first substantive Australasian publication on applying sustainability principles during remediation design and technology selection. The article appeared in the magazine's hard-copy format at the recent national Australian remediation conference Cleanup 2015 in Melbourne. The article is also published in the online edition of "Remediation Australasia," an Australian-based journal focused on news and topics of interest concerning the remediation industry.

The article is available online at:

More information:

Upcoming Webinar: STAR and STARx: Smouldering Solutions for Contaminated Soils and Liquid Organic Wastes

September 3, 2015

Join us for a free webinar entitled "STAR and STARx: Smouldering Solutions for Contaminated Soils and Liquid Organic Wastes."

DATE: Thursday, September 3, 2015 TIME 11am-12pm AEST

FEE: Free to invited guests

RSVP: Kindly contact us by September 1, 2015 at

More Information:

Geosyntec Practitioners Demonstrating International Leadership at CleanUp 2015 Conference in Melbourne, Australia

August 26, 2015

The Geosyntec family of companies will have a high-profile role at the 6th International Contaminated Site Remediation Conference (CleanUp) in Melbourne, Australia. During the conference, held September 13-16, 2015, Geosyntec will have a total of 14 platform presentations, including 2 keynotes, and 3 invited speakers, as well as sponsoring and presenting a unique audience-interactive panel session on remediation and instructing two short courses. Presentations will be made by Lange Jorstad , Garry Smith , Ryan Wymore, Bruce Marvin , Helen Dawson , Dave Major , Gary Wealthall , and Dave Reynolds .

Further information about the conference can be found at:

Invited Speakers at CleanUp2015 are listed at:

For more information, please contact Dave Reynolds at , or any of the presenters listed above.

The New Triple Bottom Line in Consulting

June 15, 2015

A quiet revolution is underway in Australian environmental consulting that consolidates optimising technical effectiveness, cost-efficiency, and sustainability in projects, write Garry Smith and Lange Jorstad.

This new triple bottom line in consulting is particularly evident in the contaminated land and groundwater remediation sector, which plays such an important part in health and environment protection and in the economics of land reuse and urban renewal. The number of sites requiring remediation nationally and the complexities of site set-up and operations intersect directly with implementation costs and community and environmental impact considerations in site remediation.

Increasingly, sites that apply smart and sustainable (efficient, minimal intrusion and development-compatible) assessment and remediation techniques are gaining community and regulatory support, subject to efficient clean-up and risk mitigation.

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For more information contact Lange Jorstad .

Webinar: Treatability Testing

March 4th, 2015

Watch it on YouTube:

For more information contact Lange Jorstad .

Our Team

Our team in Australia is part of a company with over 1,000 engineers and scientists around the globe.

Lange Jorstad, Ph.D.

Lange Jorstad has 20 years of experience in the management of both contaminated land and hydrogeological investigations, and specialist hydrogeological support for projects.
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Sarah Schiess

Sarah Schiess is a Principal based in Melbourne, Australia with 30 years of professional experience focused in the areas of groundwater hydrology and contaminated land investigation and remediation.
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Julie Konzuk, Ph.D.

Julie Konzuk has directed, managed, or provided specialist technical support for projects ranging from overall strategy development and site investigation to laboratory treatability studies.
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David Reynolds, Ph.D.

David Reynolds has extensive experience in the development and implementation of effective remediation and management strategies for complex and challenging contaminated sites.
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Paul Nicholson, P.Eng

Paul Nicholson is a senior environmental engineer with over 14 years of experience in environmental consulting with a focus on assessing and mitigating human health risks.
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Career Opportunities

Geosyntec has built a record of successful client service by attracting some of the most creative scientists and engineers from the graduate programs of leading universities around the world. Join our team and develop your environmental career in Australia.

Contact Us

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Lange Jorstad
0447 249 250

David Reynolds
0439 981 402

Sarah Schiess
61 427 083 346