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D6067 – Standard Test Method Technical Guide
🌍 Scope and Purpose for Environmental Site Characterization
The electronic cone penetrometer test is frequently used to determine subsurface stratigraphy for geotechnical and environmental purposes. However, ASTM D6067/D6067M-17 specifically addresses the unique facets of this test when applied to environmental site characterization. While the geotechnical method is covered in Test Method D5778, this practice focuses on the further considerations required for environmental projects. It is highly recommended to use the Piezocone (PCPT/CPTu) option to properly evaluate information on hydraulic conductivity and aquifer hydrostatic pressures.
The primary purpose of this practice is to discuss the specific aspects of the electronic cone penetrometer test that need to be considered when performing tests for environmental site characterization purposes. Cone penetrometer tests are often used to locate aquifer zones for the installation of wells (Practice D5092/D5092M). The cone test may be combined with direct push soil sampling for confirming soil types (Guide D6282/D6282M).
💡 Recommended Configuration: For comprehensive environmental assessments, Section 1.1 of D6067 strongly urges the use of the Piezocone (PCPT or CPTu) option to fully capture hydraulic conductivity and aquifer pressure data, a critical upgrade over standard geotechnical cone penetrometers.
⚙️ Complementary Test Methods and Site Procedures
Environmental characterization projects require specific procedural steps. The electronic cone penetrometer test often requires steam cleaning the push rods and grouting the hole. While numerous cleaning and grouting methods exist depending on project scope, local regulations, and corporate preferences, a detailed explanation of grouting procedures is discussed in Guide D6001.
To confirm permeability estimates, direct push hydraulic injection profiling (Practice D8037/D8037M) and direct push slug tests (D7242/D7242M) are complementary tests cited in the standard. Cone penetrometers can also be equipped with additional sensors for groundwater quality evaluations (Practice D6187).
| 📐 Standard Designation | ⚙️ Primary Role in Environmental Characterization |
|---|---|
| D5778 | Base Geotechnical Electronic Cone Penetrometer Test |
| D6001 | Guide for Grouting Monitoring Wells |
| D5092/D5092M | Design and Installation of Groundwater Monitoring Wells |
| D6282/D6282M | Direct Push Soil Sampling for Soil Type Confirmation |
| D8037/D8037M | Direct Push Hydraulic Injection Profiling |
| D7242/D7242M | Field Direct Push Slug Tests for Hydraulic Conductivity |
| D6187 | Additional Sensors for Groundwater Quality Evaluation |
📊 Units, Safety, and Site Applicability
The standard mandates strict adherence to distinct unit systems. The values stated in either SI units or inch-pound (in-lb) units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Units for conductivity are either m/s or cm/s depending on the sources cited. All observed and calculated values shall conform to the guidelines for significant digits and rounding established in Practice D6026.
| 📏 Parameter | 🎯 Specification / Requirement |
|---|---|
| Hydraulic Conductivity | Expressed in m/s or cm/s |
| Unit Systems | SI or Inch-Pound; each system used independently |
| Significant Digits | Must conform to Practice D6026 guidelines |
| Safety & Regulatory | User responsibility to establish appropriate safety practices |
An important scope limitation is clearly defined in the standard. This practice is applicable only at sites where chemical (organic and inorganic) wastes are a concern. It is not intended for use at radioactive or mixed (chemical and radioactive) waste sites due to the specialized monitoring requirements of drilling equipment. The standard also specifies that it cannot replace education or experience and should be used in conjunction with professional judgment.
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