PBC - Predicted Background Soil Concentrations, New Zealand

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Creative Commons Attribution 3.0 New Zealand

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Updated
28 Jun 2016

This dataset was last updated on LRIS Portal on 28 Jun 2016.

The Predicted Background Concentration (PBC) shapefile contains spatial information on the effective median, and 95th quantile estimates of the background concentration (mg/kg) of arsenic, cadmium, chromium, copper, lead, nickel and zinc across New Zealand. These background concentrations were developed for a geological unit classification, Chemical4, originating from GNS Science's QMAP 1:250 000 Geological Map of New Zealand GIS dataset (Heron 2014). Chemical4 is based on the QMAP ROCK_GROUP classification but further subdivides some on an age basis ie older sedimentary rocks from their Miocene and younger rock and sediment equivalents (Maui and Pakihi supergroups, Mortimer et al. 2014). The number of samples in each Chemical4 subgroup for which predictions are made is also provided. Predictions for Chemical4 subgroups with few underlying samples (N<30) are considered less reliable and for N<10 unreliable. These data are intended to provide an initial assessment of background soil concentrations at locations that are being assessed for use as clean-fills or managed fill or for the assessment of contaminated land.

Source: These background soil concentration predictions were developed from geostatistical analysis of trace element data from regional councils, national soils database and GNS Science identifying associations with geological parameters adapted from the GNS Science QMAP geological map dataset. The premise being that underlying geology is generally regarded as a major contributor to the geochemical signals in soils and surficial material.

Full details of the development of these data is provided in 'Envirolink Report (C09X1402) 2015.pdf'. See 'PBC_FieldsDescription.xlsx' for a description of the fields in the attribute table.

References: Heron DW (custodian) 2014. Geological map of New Zealand 1:250,000. GNS Science geological map 1. Lower Hutt, New Zealand, GNS Science.

Mortimer N, Rattenbury MS, King PR, Bland KJ, Barrell DJA, Bache F, Begg JG, Campbell HJ, Cox SC, Crampton JS, Edbrooke SW, Forsyth PJ, Johnston MR, Jongens R, Lee J, Leonard GS, Raine JI, Skinner DNB, Timm C, Townsend DB, Tulloch AJ, Turnbull IM, Turnbull RE 2014. High-level stratigraphic scheme for New Zealand rocks. New Zealand Journal of Geology and Geophysics 57: 402–419.

Layer ID 48470
Data type Vector polygon
Feature count 39371
Services Vector Query API, Web Feature Service (WFS), Catalog Service (CS-W), data.govt.nz Atom Feed

Envirolink Report (C09X1402) 2015

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Creative Commons Attribution 3.0

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Added
18 Jul 2016

This item was first added to LRIS Portal on 18 Jul 2016

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Report entitled "Background soil concentrations of selected trace elements and organic contaminants in New Zealand" (Envirolink Tools Grant: C09X1402)

Document ID9530
File nameenvirolink-report-c09x1402-2015.pdf
TypePDF
Size3.75 MB

PBC FieldsDescription

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Creative Commons Attribution 3.0 New Zealand

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Added
19 Jun 2016

This item was first added to LRIS Portal on 19 Jun 2016

Predicted Background Concentration (PBC) field names and descriptions for the shapefile containing data on background concentrations (mg/kg) of arsenic, cadmium, chromium, copper, lead, nickel and zinc across New Zealand.

Document ID9517
File namepbc-fieldsdescription.xlsx
TypeXLSX
Size9.72 KB

PBC Maps

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23 Jun 2016

This item was first added to LRIS Portal on 23 Jun 2016

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Example colour maps of Predicted Background Concentration (PBC) shapefile containing data on background concentrations (mg/kg) of arsenic, cadmium, chromium, copper, lead, nickel and zinc across New Zealand.

Document ID9518
File namepbc-maps.pdf
TypePDF
Size1.46 MB