The Russley Village Development – Block E

Client:  The Russley Village Limited
Date:  2017 – 2019

As part of the further development of the retirement village, PDP was engaged to provide advice on contaminated land matters and the applicability of the NESCS. 

After initial reviews of site history and from discussions with the Client, it was identified that landfill material may still be located within an area of the site where a new facility was to be constructed.  PDP confirmed the presence of buried landfill waste across part of the site through a geophysical investigation and targeted test pitting.  It was the Client’s preference to, as far as practicable, remove all landfill waste as part of the development works.

The results of test pit observations and laboratory analysis allowed us to address the requirements of the NESCS and obtain a NESCS resource consent for the works on behalf of the Client.  PDP also gained the necessary resource consents from the regional authority with regards to the earthworks and management of construction phase stormwater.

PDP provided suitable offsite disposal options based on individual landfill consent acceptance requirements.  The cheaper of the two landfill options required an absence of anthropogenic material and particle size less than approximately 50 mm in any one plane. We developed a methodology whereby most of the material could be disposed of at the cheaper landfill option through screening of the landfill material using a root rake, that allowed acceptably sized material to pass through the screen.  We also advised mixing this material with overlying ‘cleaner’ fill material to dilute the concentrations of heavy metal contaminants within the landfill material.  PDP supervised these works and used a portable X-Ray Fluorescence Spectrometer (XRF) to aid in confirming the soils met landfill acceptance criteria with regard to heavy metal concentrations within the soil.  

We also devised suitable procedures to manage the discovery of a pocket of asbestos containing material within the historical landfill, including advising the engagement of licensed asbestos removalists.

Following remedial works, PDP completed validation soil sampling around the excavation to demonstrate the remaining soils suitability for residential development.  PDP accurately positioned the extent of a small volume of buried landfill material remaining along one boundary of the site, that was unable to be removed for geotechnical stability reasons, using a Trimble Catalyst GPS system.  This information was included in a Long-Term Site Management Plan.  PDP also completed a landfill gas risk assessment, which concluded that there was an acceptably low risk to the proposed residential care development.

We are pleased to have been able to contribute to this project and demonstrate the suitability of the site for a residential land use; and also to have developed a considerable cost-saving offsite soil disposal methodology.

Key Aspects:

  • Contaminated land Assessment
  • Detailed Geophysical survey using multiple sensors (i.e. radar and electromagnetic)
  • Preliminary and Detailed Site Investigations
  • Site Management Plan
  • Resource Management (National Environmental Standard for the Assessing and Managing Contaminants in Soil to Protect Human Health) Regulations 2011
  • Supervision of remedial works
  • XRF screening of soil to confirm soils meet landfill acceptance criteria
  • Landfill gas management survey
  • Management of accidental discoveries, including management of asbestos wastes
  • Validation soil sampling and preparation of a Long-Term Site Management Plan

Client:  The Russley Village Limited
Date:  2017 – 2019

 

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