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D4687-14 – Standard Test Method Technical Guide
ASTM D4687-14 (Reapproved 2022), under the jurisdiction of ASTM Committee D34 on Waste Management and Subcommittee D34.01.01 on Planning for Sampling, provides a standardized approach for general planning of waste sampling. The standard emphasizes that analysis and testing of solid waste requires collection of adequately sized, representative samples. Wastes are often found in various locations and physical states, often as nonhomogeneous mixtures in stratified layers or poorly mixed conglomerations. For example, wastes in surface impoundments may have stratified sludges covered by ponded wastewater, requiring careful sampling of wastewater, sludge, and underlying soil.
📑 Scope and Significance
Section 1 outlines the scope of the standard, covering aspects common to waste sampling such as safety plans (Section 4), sampling plans (Section 5), quality assurance considerations (Section 6), general sampling considerations (Section 7), preservation and containerization (Section 8), cleaning equipment (Section 9), packaging, labeling, and shipping procedures (Section 10), and chain-of-custody procedure (Section 11). The standard does not provide comprehensive procedures for these aspects nor serve as a guide to any specific application; it is the user’s responsibility to ensure proper and adequate procedures. The significance and use, per Section 3, is to provide general information helpful for writing sampling plans, safety plans, labeling and shipping procedures, chain-of-custody procedures, general sampling procedures, general cleaning procedures, and general preservation procedures.
| 🟦 Sampling Aspect | 📏 Section Reference |
|---|---|
| Safety Plans | 4 |
| Sampling Plans | 5 |
| Quality Assurance Considerations | 6 |
| General Sampling Considerations | 7 |
| Preservation and Containerization | 8 |
| Cleaning Equipment | 9 |
| Packaging, Labeling, and Shipping Procedures | 10 |
| Chain-of-Custody Procedure | 11 |
⚙️ Key Planning Components
The standard references key documents including ASTM E122 for sample size calculation and EPA-SW-846 for testing methods. Values are stated in inch-pound units as standard, with SI units in parentheses for information only. Planning must incorporate safety, health, and environmental practices, as well as regulatory limitations, as highlighted in Sections 3 and 4. The collector may face sampling wastewater, sludge, and soil beneath sludges, requiring a carefully assessed, well-planned, and well-executed sampling routine.
| 📚 Referenced Document | 🎯 Purpose |
|---|---|
| ASTM E122 | Practice for Calculating Sample Size to Estimate Average |
| EPA-SW-846 | Test Methods for Evaluating Solid Waste |
📊 Quality Assurance and Safety
Quality assurance is critical to ensure representative sampling. The standard provides guidance on developing quality assurance considerations (Section 6) and safety plans (Section 4) to address appropriate practices. Safety concerns are briefly addressed in the standard, but it is the user’s responsibility to establish appropriate safety, health, and environmental practices and determine regulatory compliance. The standard includes precautionary statements in Sections 3.2, 3.3, and Section 4. Additionally, chain-of-custody procedures (Section 11) ensure sample integrity.
📌 Technical Note: The sampling routine must be tailored to fit the waste and situation, considering physical state and location, as per the standard’s introduction. Always determine the applicability of regulatory limitations prior to sampling.
⚠️ Important: Wastes are often nonhomogeneous; stratified layers require careful assessment to collect representative samples. For example, surface impoundments with sludges and wastewater need a well-executed sampling plan.
❓ Frequently Asked Questions
🔍 What is the primary purpose of ASTM D4687-14?
To provide general guidance for planning waste sampling, ensuring collection of adequately sized, representative samples through tailored routines that account for waste heterogeneity and varying physical states.
💡 What are the key aspects covered in the standard?
Safety plans, sampling plans, quality assurance considerations, general sampling considerations, preservation and containerization, cleaning equipment, packaging, labeling, shipping procedures, and chain-of-custody procedures.
⚡ Why is representative sampling emphasized?
Wastes are often nonhomogeneous mixtures in stratified layers or poorly mixed conglomerations, requiring careful planning to ensure samples represent the lot adequately for accurate analysis and testing.
📌 Which units are considered standard in this guide?
Inch-pound units are the standard; SI units are provided in parentheses for information only and are not considered standard.