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  Services » Publications » Technical reports - by year » tr201330

REGEMP II 2013 interpretation of geochemical data

On this page: Abstract, table of contents

Report: TR 2013/30

Author: Golder Associates

Abstract

Waikato Regional Council operates a Regional Geothermal Geochemistry Monitoring Programme (REGEMP). The purpose of the REGEMP is to collate geochemical data from geothermal sites throughout the Waikato region so that trends and patterns in these data can be determined and assist in the sustainable management of these resources.

The programme is reviewed approximately every four to five years, and this 2013 report represents the third review.

The 2013 review follows a similar structure to the 2012 report. As such, this report contains:

  • analysis of geographic and temporal trends, and correlations between chemical species
  • an assessment of sampling results from the 2013 monitoring programme in the context of previous monitoring results
  • commentary on any unusual results
  • recommendations to enhance the programme.

The open-source software package R (version 3.0) was used to analyse and interpret the REGEMP data. Examples of scripts used to generate the statistical and graphical outputs presented in this report are provided in Appendix A.

REGEMP II 2013 interpretation of geochemical data (3mb)

Table of contents

1.0 Introduction 1
1.1 Background 1
1.2 Report scope 1
2.0 2013 data and contextual analysis 1
2.1 Data sources 1
2.2 Associations 2
2.2.1 Approach 2
2.2.2 PCA results 3
2.1 Cluster analysis 4
2.2 Implications for the REGEMP 7
2.3 Summary 8
3.0 Spatial trends 8
3.1 Approach 8
3.2 Results of spatial analysis 8
3.2.1 Approach 8
3.2.2 Temperature 8
3.2.3 pH 8
3.2.4 Chloride 9
3.2.5 Potassium 9
3.2.6 Sulfate 9
3.2.7 Silicon 9
3.2.8 Bicarbonate 9
3.2.9 Lithium 14
3.2.10 Arsenic 14
3.2.11 Iron 14
3.3 Conclusions and implications for the REGEMP 14
4.0 Temporal trends 16
4.1 Site selection 16
4.2 General trends 16
4.2.1 Temperature and pH 16
4.2.2 Chemistry 17
4.3 Summary and implications for the REGEMP 17
5.0 Conclusions and future monitoring 17
6.0 Limitations 22
7.0 References 22
  Appendix A: REGEMP II monitored systems 23
  Appendix B: R scripts 26
  Appendix C: REGEMP II data 31
  Appendix D: Report limitations 32
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