Environmental Science

A DSI is effectively a PSI with the addition of sampling. In addition to the PSI scope of works:
• Collection of soil samples. Depending on the proposed activity or reason for the DSI and results of the desk study (PSI), the samples will be collected on a random, targeted or combined random and targeted basis from the areas of the site identified being potentially affected by identified HAIL activities
• Analysis of samples for identified contaminants of concern typically including heavy metals, asbestos, and at least one of a variety of potential organic compound contaminant groups such as organochlorine pesticides (OCPs) or polycyclic aromatic hydrocarbons (PAHs)
• Preparation of an investigation report that includes comparison of soil analytical data with relevant Soil Contaminant Standards (SCS) and comment on NESCS compliance and soil management requirements.

Notes:
• We own and operate a field X-Ray Fluorescence Analyser (XRF) that enables real time analysis of soil samples for heavy metals in the field. Use of this instrument enables:
o Collection of more data than typical site investigations, resulting in a higher degree of confidence in investigation conclusions
o Real time screening enables onsite preliminary advice regarding likely contamination management requirements.
o Quality control on XRF data is undertaken by laboratory analysis
• The NESCS is soil contamination and human health risk focused, and accordingly DSIs are typically focused on these contamination scenarios. However other contaminant phases may be present (for example groundwater, vapour/landfill gas, surface water) that may present a risk to human health and/or contamination may be present that presents a risk to the environment. We are able to assess and advise on alternative receptors and/or contaminant phases on a site specific basis as and if required.

Please Note:
This price is for a standard DSI on a site of up to 1,000m² in size within Christchurch City, Selwyn District or Waimakariri District. For larger sites, or sites which fall outside of these areas, please contact us and we will provide a site specific scope and price.

The cost is calculated assuming:
• Samples able to be easily collected using manual sampling techniques (hand auger)
• Collection of up to 12 samples from up to 6 locations
• Laboratory analysis of up to 6 samples for heavy metals and 6 samples for PAHs (or up to 4 composite samples for OCPs)
• Additional costs may be incurred if additional analysis or analysis for additional compounds (for example asbestos) is needed.

If there are any conditions that need additional work, that will incur possible additional costs, these will be discussed with you to decide on how you wish to proceed. Any additional works agreed to will be invoiced following the conclusion of work.

A PSI comprises of
• A desk top study including (but not limited to) a review of Regional Council Land Use Registers (e.g. ECan LLUR) and databases, the District Council property file, available historic aerial photographs and any other existing reports on the site
• A site walkover inspection to identify potential HAIL activities and/or visual indicators of potential soil contamination
• Preparation of a report detailing the investigation methodology and findings

Depending on the proposed activity (for example a subdivision) we will recommend progression to a Detailed Site Investigation prior to completion of the PSI if HAIL activities that may result in a risk to human health are identified.

Please Note:
This price is for a preliminary site investigation on a site of up to 1ha in size within Christchurch City, Selwyn District or Waimakariri District. For larger sites, or sites which fall outside of these areas, please contact us and we will provide a site specific scope and price.

If there are any conditions that need additional work, that will incur possible additional costs, these will be discussed with you to decide on how you wish to proceed. Any additional works agreed to will be invoiced following the conclusion of work.