ASTM D7046-11 PDF

Full title and description

Standard Guide for Use of the Metal Detection Method for Subsurface Exploration — ASTM D7046-11. This guide provides an overview of metal-detection equipment, field procedures, interpretation methods, and limitations for locating and characterizing subsurface metallic objects (both ferrous and nonferrous) in site investigations and geophysical surveys.

Abstract

ASTM D7046-11 summarizes principles and practical guidance for metal-detection surveys, describing frequency-domain and time-domain detector types, typical equipment, survey procedures, data recording, and common interferences and limitations (for example, effects of soil mineralization and target depth/size). It is intended as a guide—not a prescriptive test method—and emphasizes integration with other site information and appropriate health/safety precautions.

General information

• Status: Withdrawn (withdrawal recorded in 2020).
• Publication date: 2011 (designation D7046-11; effective date May 1, 2011).
• Publisher: ASTM International.
• ICS / categories: 13.080.99 (Geophysical investigations / other soil/rock standards).
• Edition / version: D7046-11 (2011 edition).
• Number of pages: 8 pages (original published document).

Scope

This guide covers the electromagnetic metal-detection method for land-based subsurface exploration: detector principles (induction/eddy-current response), frequency-domain and time-domain instrument types, recommended field procedures, typical data outputs, survey planning considerations, common interferences (soil conductivity, magnetic susceptibility, cultural clutter), limitations in depth and resolution, and guidance on personnel qualifications and safety. It explicitly does not replace detailed training or project-specific procedures and recommends use in conjunction with other geophysical and site investigation data.

Key topics and requirements

• Overview of frequency-domain and time-domain metal detectors and their operating principles.
• Equipment components and configuration (transmit/receive coils, power supply, data logging options).
• Field survey procedures: calibration/ground balancing, gridding, systematic sweep patterns, and documentation.
• Interpretation guidance: how target size, depth, orientation, and corrosion affect response; expected resolution and depth limits.
• Sources of interference and limitations, including mineralized soils, cultural noise, and rapidly decreasing response with depth.
• Personnel and training recommendations, and safety/precautions for surveys at potentially hazardous sites.
• Recommendation to use this guide alongside other ASTM geophysical and site-characterization practices.

Typical use and users

Used by environmental and geotechnical consultants, site investigators, geophysicists, archaeologists, utility-locating contractors, remediation teams, and UXO/ordnance-response personnel for locating buried metal objects such as drums, tanks, utilities, landfill metal, and other metallic debris. The guide supports preliminary reconnaissance, delineation of metallic targets, and integration with other subsurface data.

Related standards

ASTM D7046-11 references and is commonly used with other ASTM standards and practices for site and geophysical work, including Practice D3740 (personnel qualifications), Guide D6285 (abandoned wells), Guide/Standards for selecting surface geophysical methods (D6429 series), and related geophysical and site-characterization standards. Users should consult current editions of those documents for complete project guidance.

Keywords

metal detection; metal detector; subsurface exploration; geophysics; frequency-domain; time-domain; soil conductivity; target detection; site investigation; ASTM D7046-11.

FAQ

Q: What is this standard?

A: ASTM D7046-11 is a guide that summarizes the metal-detection method for locating and characterizing buried metallic objects during subsurface investigations. It explains detector types, survey practices, interpretation issues, and limitations.

Q: What does it cover?

A: It covers electromagnetic metal detectors (frequency- and time-domain), recommended field procedures (calibration, gridding, sweep technique), data recording, typical interferences (soil mineralization, cultural noise), limitations on depth and resolution, and recommended precautions. It is descriptive guidance rather than a mandatory test procedure.

Q: Who typically uses it?

A: Environmental consultants, geophysicists, remediation and UXO teams, archaeologists, municipal and utility locating crews, and other professionals performing surface geophysical surveys or preliminary metallic-target detection.

Q: Is it current or superseded?

A: D7046-11 was published in 2011 and later withdrawn (withdrawal recorded in 2020). Users should consult ASTM for the current guidance; a more recent revision of D7046 (D7046-25) is available as the updated guide. Always check ASTM for the latest active designation before use.

Q: Is it part of a series?

A: It forms part of the suite of ASTM standards and guides for surface and subsurface site characterization under Committee D18 (Surface and Subsurface Characterization) and is intended to be used with complementary practices and guides (for example D3740, D6285, and guidance on selecting geophysical methods).

Q: What are the key keywords?

A: Metal detection, metal detector, frequency-domain, time-domain, subsurface investigation, geophysical survey, buried metallic objects, target depth/size, survey procedures.