Foreword

Introduction

1Scope

2Terms and definitions

3Principle

3.1General

3.2Monitoring objectives

4Design

4.1Introduction

4.1.1General

4.1.2Initial design

4.1.3Detailed design

4.2Conceptual model

4.2.1General

4.2.2Rock strength

4.2.3Depth

4.2.4Hydrogeological considerations

4.3Drilling method and installation size

4.3.1General

4.3.2Influence of geology on drilling technique selection

4.3.3The influence of depth

4.3.4Borehole diameter

4.4Installation design

4.4.1Monitoring point installation

4.4.2Locating response zone

4.4.3Multi-level monitoring

4.5Construction material selection

4.5.1General

4.5.2Casing materials

4.5.3Filter packs

4.5.4Screen selection

4.5.5Sealing and backfilling the borehole

4.6Headworks

4.7Surface environment

5Construction phase

5.1General

5.2Record keeping

5.3Borehole drilling practice

5.3.1General

5.3.2Cleanliness

5.3.3Use of lubricants

5.3.4Waste collection and disposal

5.4Installation practice

5.4.1General

5.4.2Well screen and casing

5.4.3Filter pack

5.4.4Bentonite seal

5.4.5Grout

5.4.6Headworks

5.5Borehole development

6Post-construction activities

6.1Routine inspections and maintenance

6.2Rehabilitation

7Safety precautions

8Quality assurance and quality control

Annex ACommon drilling techniques used in GQMP installation (informative)

Annex BHeadwork completion design examples (informative)

Bibliography