Events

Cheryl Halim is a Principal Environmental Engineer and a NSW EPA accredited Site Auditor with more than 20 years of experience focusing on environmental assessment and remediation, auditing, risk assessment and asbestos assessment and mitigation. She offers clients a wealth of experience in assessing risk, auditing contaminated sites, and conducting due diligence.

Cheryl assists clients, large and small, in the assessment and remediation of various contamination in infrastructure, real estate, government and manufacturing industries. Cheryl also has Exemplar Global certification (ISO 14001:2015) as Lead Auditor for Environmental Management System and has conducted numerous Independent Environmental Audits for State Significant Development projects and has been involved in audits of schools, mines, and residential and commercial sites.

Jonathan Thom has over 20 years of expertise in contaminated land assessment, risk assessment, remediation, and environmental auditing. He is an appointed Contaminated Land Auditor in both Queensland and Victoria, and a Certified Environmental Practitioner – Site Contamination Specialist (CEnvP SC).

His work spans Defence, aviation, linear infrastructure, petroleum, and landfill. He acts as a technical advisor on major infrastructure projects and performs environmental audits and auditor verifications on former landfills and redevelopment sites in both metropolitan Melbourne and the urban fringes.

With over 25 years of experience, Stephan Pawelczyk is a Principal Environmental Scientist and NSW EPA Accredited Site Auditor in the contaminated land industry. His career spans both the public and private sectors, providing a comprehensive perspective on the technical and regulatory challenges inherent in complex environmental assessments.

In addition to his work in New South Wales, Stephan is formally registered to conduct audits in Tasmania and is a Certified Environmental Practitioner Site Contamination Specialist (CEnvP SC). He is a past board member, director, and president of ALGA, and currently serves as the Co-Chair of the Environmental Auditors Specialist Interest Group (SIG), where he is dedicated to fostering collaboration and advancing best practices within the auditing community.

As a proud UTS alumnus, Stephan is also passionate about mentoring the next generation of environmental professionals through guest lecturing and formal mentoring programmes, ensuring the continued growth and integrity of the industry.

Stefan Voorham is an Environmental Engineer at Tetra Tech Coffey and has worked on multiple large-scale remediation projects from design, field operation, to remediation cessation reporting. Stefan enjoys the challenge of finding smart, innovative, and sustainable remediation approaches for clients and for the betterment of the environment. This has led him to be part of the SURF-ANZ SIG for the past two years and co-chair since 2025.

Sarah is passionate about improving the environment through the assessment of contamination. Having completed her PhD at the University of Wollongong focussing on sedimentology and geomorphology of rivers in dryland environments, Sarah is now working as a Senior Environmental Geoscientist at GHD, in Wollongong. The focus of Sarah's work in the contamination and remediation space has, to date, been large-scale remediation projects including gasworks, landfills and former industrial sites. Sarah's specialist area is the assessment of contaminated sediments to assess risks to receptors in aquatic environments and inform dredging and disposal projects.