Site investigation - Geotechnical Investigation and Design Tables - page 3

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Construction costs ∼ 85% to 95% of total capital project costs.

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Design costs ∼ 5% to 10% of total capital costs.

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Geotechnical costs ∼ 0.1% to 4% of total capital costs.

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Each peaks at different phase as shown in Figure 1.1.

Figure 1.1 Steps in effective use of geotechnical input throughout all phases of the project.

1.3 Relevance of scale
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At each stage of the project, a different scale effect applies to the investigation.

Table 1.3 Relevance of scale.

Size study Typical scale Typical phase of project Relevance

Regional 1: 100,000 Regional studies GIS analysis/Hazard assessment

Medium 1: 25,000 Feasibility studies Land units/Hazard analysis

Large 1: 10,000 Planning /IAS Terrain/Risk assessment

Detailed 1: 2,000 Detailed design Detailed development.

Risk analysis

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GIS - Geographic Information Systems

1.4 Planning of site investigation
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The SI depends on the phase of the project.

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The testing intensity should reflect the map scale of the current phase of the study.