EPA waste classification


Hilary Hall

Hilary Hall

Senior Consultant

M.Eng.Sci. (Water & Wastewater Treatment), B.Eng. (Chem.)

Hilary is an experienced consulting engineer with expertise in wastewater treatment and biosolids management. She has experience in wastewater treatment design, operation, contaminant investigations and recycled water use. Hilary’s biosolids expertise includes strategic planning, options assessment, beneficial agricultural use and unregulated contaminants. With a background in wastewater operations, Hilary has a strong emphasis on developing management plans which are practical, site-specific and easy to understand.

Gemma Wakefield

Gemma Wakefield


B.Eng. (Env)(Hons)

Gemma is an environmental engineer who is passionate about sustainable water management and environmental protection.

She has six years’ experience in the water sector with technical skills in water quality, water resources and groundwater. She has applied her broad range of skills to deliver several large and complex projects relating to the assessment and management of land, groundwater and surface water.

She has planned and delivered environmental assessment projects for a range of public and private clients. She has prepared reports including conceptual site models, drought response plans, technical discussion papers, as well as contributed to other corporate documents e.g. urban water strategy and annual reports.

Gemma has experience working with emerging contaminants, including the assessment and management of PFAS. Gemma has experience scoping, planning and reporting on environmental assessment works according to industry standards. She has working knowledge of environmental regulatory framework.

Gemma has undertaken modelling of water resources, including demand forecasting, drought testing and yield assessments. She has developed and implemented data management processes to improve efficiencies.