Coromandel Wastewater Treatment Plant
GWE completed a Detailed Site Investigation (DSI) at a Wastewater Treatment Plant in the Coromandel.
PROJECT DESCRIPTION
The desktop investigation identified that the property was undeveloped prior to the development of oxidation ponds, sand filters and disposal fields. Concerns were noted around the potential discharge of waste at site that may have introduced PFAS contamination. Additionally, the site was within an environment which could be considered as having a high probability of acid sulphate soils (ASS).
GWE collected soil samples across the site and undertook field oxidation testing of soil with hydrogen peroxide as part of an ASS investigation.
All samples complied with the adopted criteria of the NESCS, no PFAS was identified, and therefore the NESCS did not apply to the piece of site.
Results of ASS testing indicated that soil did not react to a pH below 4 and that the Action Criteria were not exceeded.
Ultimately the results indicated to the client that project risks were low with regard to soil contamination and in ground acidity risk and the client progressed with construction and development plans on that basis.