| Use: | This technology has the potential to offer borehole access to subsurface areas beneath buildings, tanks, landfills, and impoundments where vertical drill rigs can not reach. |
Description:
Directional drilling involves use of equipment located at the ground surface designed to drill slanted or horizontal holes into the subsurface. Test applications have focused primarily on remedial activities, but the potential exists for use during characterization and monitoring activities. All directional drilling systems require: (1) a steerable drill stem, and (2) the capability to detect the location of the drill head or trajectory of the borehole. Directional drilling equipment ranges in size from scaled down rigs developed for the oil industry to relatively compact, simple equipment used to install utilities.
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: |
| MODERATE | MODERATE | Not Applicable | MAXIMUM |
Equipment that uses water or other fluids to advance the well bore might affect quality of samples.
| Maximum Depth: | Up to 100 feet. Utility rigs, although less expensive than petroleum rigs, have limited depth capabilities (around 20 feet compared to 300 feet) due to locating methods. New locators that send signals up the drill steel are expected to expand the depth capabilities of smaller rigs. |
| Production Rate: | Sample is available after a short amount of time. |
| Investigation Derived Waste Volume: | Large volume of waste. |
| Technology Status: | Commercially available and routinely used field technology. |
| Certification/Verification: | Technology has not participated in CalEPA certification and/or CSCT verification program. |
| Relative Cost per Sample: | Most expensive. |
Limitations:
EPA Guidance:
| EPA 625/R-94/003 | Alternative Methods for Fluid Delivery and Recovery. |
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