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D5474-93 – Standard Test Method Technical Guide
ASTM D5474-93 (Reapproved 2012) provides a comprehensive framework for selecting data elements necessary for the documentation of groundwater sites. This guide is essential for hydrogeologists, environmental consultants, and regulatory professionals tasked with investigating the availability, protection, or restoration of groundwater resources. The standard emphasizes that the level of detail and type of data collected must be tailored to the specific objectives of the study, the complexity of the system, and available resources (Section 1.2).
🏞️ Scope and Core Concepts of Groundwater Site Documentation
According to the standard, a groundwater site is defined as any source, location, or sampling station capable of producing water or hydrologic data from a natural stratum below the surface of the earth. This broadly includes wells, springs, seeps, drains, tunnels, and other excavations such as boreholes or sinkholes that are hydraulically connected to the groundwater system (Note 1).
The guide focuses specifically on data elements gathered at the field-site location. These elements are critical for interpreting site hydrology and satisfying regulatory requirements. The systematic and consistent collection of this data is a central tenet of the standard, ensuring that investigations into groundwater availability and restoration are built on a reliable foundation (Section 1.1).
📌 Scope Limitation: While this guide covers field-site data, it explicitly excludes other analytical and Quality Assurance/Quality Control (QA/QC) considerations, which are addressed in separate ASTM standards (Section 1.2).
🗂️ Hierarchical Data Framework and Referenced Standards
The data elements recommended in D5474 are detailed across four primary ASTM standards. These documents create a tiered system for documenting groundwater sites, ranging from minimum identification to comprehensive physical and usage descriptors.
| 🟦 Standard | 📋 Focus Area | 🎯 Primary Function |
|---|---|---|
| D5254 | Minimum Set of Data Elements | Establish the minimum identification requirements for a groundwater site. |
| D5408 | Part One—Additional Identification Descriptors | Provide supplementary data elements for detailed site identification. |
| D5409 | Part Two—Physical Descriptors | Describe the physical construction and characteristics of the site. |
| D5410 | Part Three—Usage Descriptors | Document the historical and current usage of the groundwater site. |
Examples of specific investigations are provided within the guide to illustrate the logic of selecting individual and combinations of these data elements to meet specific study requirements (Section 1.1).
⚙️ Applying the Guide: Professional Judgment and Data Integrity
The standard serves as an organized collection of options rather than a mandatory checklist. Section 1.4 explicitly states that this document cannot replace education or experience and should be used in conjunction with professional judgment. It is not intended to represent or replace the standard of care by which the adequacy of a given professional service must be judged.
Practitioners must recognize that not all aspects of the guide are applicable in all circumstances. The unique aspects of each project must be carefully considered to ensure that the data collected is sufficient for interpreting the hydrology of the groundwater source without incurring unnecessary costs or delays from superfluous data collection.
⚠️ Standard of Care Disclaimer: The word “Standard” in the title of this document means only that the document has been approved through the ASTM consensus process. It does not imply a rigid protocol. Users must apply the guide with careful consideration of the project’s specific goals and geological complexity.
❓ Frequently Asked Questions
🔍 What defines a “groundwater site” under this standard?
Per Note 1, a groundwater site is any source, location, or sampling station capable of producing water or hydrologic data from a natural stratum below the earth’s surface. This includes wells, springs, seeps, drains, tunnels, and related excavations that are hydraulically connected to groundwater.
💡 Which ASTM standards detail the specific data elements referenced in this guide?
The guide references four key standards: D5254 (Minimum Set of Data Elements), D5408 (Part One—Additional Identification Descriptors), D5409 (Part Two—Physical Descriptors), and D5410 (Part Three—Usage Descriptors). These form the data backbone for the framework.
⚡ How does the standard advise selecting data for a specific investigation?
The standard states that the level of detail, precision, bias, and type of data must depend on the objective of the study, the expected complexity of the system, and the resources available for the investigation (Section 1.2). It provides logic for selecting individual and combinations of data elements.
📌 Does D5474 establish a legal standard of care?
No. Section 1.4 clearly states that this standard is not intended to represent or replace the standard of care for professional services. It is an organized collection of options that must be used alongside professional education, experience, and judgment.