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D6429-23 – Standard Test Method Technical Guide
📐 Overview and Scope of Surface Geophysical Methods
This guide covers the selection of surface geophysical methods as commonly applied to geologic, geotechnical, hydrologic, and environmental site investigations and subsequent site characterization, as well as forensic and archaeological applications. These geophysical methods are rarely the sole method used in the site investigation and are often used for pre-screening to guide how and where drilling, sampling or other targeted in situ testing are conducted. This guide does not describe the specific procedures for conducting geophysical surveys; individual guides have been developed for many surface geophysical methods.
⚙️ Key Applications and Competence Requirements
Surface geophysical methods yield direct and indirect measurements of the physical properties of soil and rock and pore fluids, as well as buried objects. The success of a geophysical survey is dependent upon many factors, including site geology and the competence of personnel. Qualified professionals—such as engineers, soil scientists, geophysicists, engineering geologists or geologists—who have appropriate experience and, if required by local regulations, applicable certification, licensure or registration, should be involved. Personnel without specialized training should be cautious and seek assistance from qualified professionals.
📊 Referenced Standards and Measurement Units
This standard references several ASTM guides, practices, and test methods for detailed information on specific geophysical methods. The table below lists key standards cited in this guide. Values are stated in SI units as standard, with values in parentheses provided for information only.
| 🟦 Standard | 📏 Description |
|---|---|
| D420 | Guide for Site Characterization for Engineering, Design, and Construction Purposes |
| D5730 | Guide for Geotechnical and Environmental Site Investigation |
| D5753 | Guide for Planning and Conducting Borehole Geophysical Logging |
| D5777 | Guide for Using the Seismic Refraction Method for Subsurface Investigation |
| D6430 | Guide for Ground Penetrating Radar |
| D6431 | Guide for Electromagnetic Induction |
This standard is not intended to represent or replace the standard of care by which the adequacy of a given professional service must be judged. Always use professional judgment and consider project-specific aspects.
It is recommended that users of this guide be familiar with the references cited and with relevant ASTM guides and practices to ensure successful application.
❓ Frequently Asked Questions
🔍 What does D6429-23 cover?
It provides guidance for selecting surface geophysical methods for geologic, geotechnical, hydrologic, environmental, forensic, and archaeological site investigations.
💡 Who is considered a qualified professional in this standard?
Qualified professionals include engineers, soil scientists, geophysicists, engineering geologists, or geologists with appropriate experience, certification, or licensure.
⚡ How are surface geophysical methods used in practice?
They are often used for pre-screening to guide drilling and sampling, and are rarely the sole method used in site investigation.
📌 What units are specified in the standard?
SI units are regarded as standard; values in parentheses are for information only.