Technical Guidance 48 (Part 2): Risk-Based Investigation of Environmental Contamination

Apr 15, 2026

The guidance reflects the collective, twenty-plus year experience of a large group of local, national and international environmental experts trained in Gy’s Theory of Sampling. The guidance focuses on the use of “Decision Unit (DU)” and “Multi Increment® Sample”...

Technical Guidance 48 (Part 1): Risk-Based Investigation of Environmental Contamination

Mar 30, 2026

The two-part technical guidance document was originally developed and published by the HawaiÔi State Department of Health for use in site investigations, and was later adapted f….

Technical Guidance 47: Australian case studies of light non-aqueous phase liquid (LNAPL) natural source zone depletion rates compared with conventional active recovery efforts

Mar 30, 2026

Natural rates of mass loss and biodegradation of light non-aqueous phase liquid (LNAPL) fuels and oils in soil and groundwater is termed natural source zone depletion (NSZD).

Technical Guidance 46: The role of natural source zone depletion in the management of light non-aqueous phase liquid contaminated sites

Mar 30, 2026

This report discusses a growing body of research showing that NSZD is ubiquitous at LNAPL sites. NSZD processes occur at all LNAPL sites to some degree and understanding, quantifying and evaluating their effectiveness is therefore an important part of a sustainable...

Technical Guidance 45: Societal perceptions on remediation technologies guidance for engagement with residents

Mar 30, 2026

Remediation policies and guidelines are increasingly recognising the value of drawing on the knowledge and experiences of diverse stakeholders, including affected residents, to support technology selection, and to inform other related areas of remediation policy such...