| Use: | These methods provide information useful for selection of drill hole placement and vertical placement of permanent monitoring wells. |
Description:
Cores are usually collected with a power-driven sampling device (split and solid barrel, rotating core, thin-wall open tube, and thin-wall piston) which are driven ahead by the cutting head of the drill bit. Various methods are available for extracting water samples from cores.
Analytes:
| 1. Non-Halogenated VOCs | 5. PAHs | 9. Inorganics |
| 2. Non-Halogenated SVOCs | 6. Pesticides/Herbicides | 10. Explosives |
| 3. Halogenated VOCs | 7. Metals | 11. TPHs |
| 4. Halogenated SVOCs | 8. Radionuclides |
Media:
| Soil: | Ground Water: | Surface Water: | Gas/Air: |
| Not Applicable | MINIMUM | Not Applicable | MODERATE |
Water extracted from cores can be contaminated by drilling fluids and might undergo degassing and volatilization at the ground surface or during extraction.
| Maximum Depth: | >100 feet. |
| Production Rate: | Sample is available after a short amount of time. |
| Investigation Derived Waste Volume: | Medium volume of waste. |
| Technology Status: | Commercially available technology with moderate field experience. |
| Certification/Verification: | Technology has not participated in CalEPA certification and/or CSCT verification program. |
| Relative Cost per Sample: | Least expensive. |
Limitations:
ASTM Standards:
| D 2113 | Practice for Diamond Core Drilling for Site Investigation. |
| D 5079 | Practice for Preserving and Transporting Rock Core Samples. |
| D 6169 | Guide for Selection of Soil and Rock Sampling Devices with Drill Rigs for Environmental Investigations. |
EPA Guidance:
| EPA 600/4-89/034 | Handbook of Suggested Practices for the Design and installation of Ground- Water Monitoring Wells. |
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