| Use: | This method allows sampling for vertical distribution of ground water constituents. |
Description:
Nested wells/single borehole installations consist of a cluster of single riser/limited interval wells that are installed at different depths in a single borehole. A grout seal separates each screened interval. Installing in-situ samplers or individual gas-drive/suction-lift samplers at different levels in a single borehole can eliminate the use of well casings.
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 |
| Maximum Depth: | Up to 100 feet. Generally smaller diameters of individual wells in a nest compared to single riser installations means that smaller volumes of water must be removed for purging. |
| Production Rate: | Sample is available after an extended wait. |
| Investigation Derived Waste Volume: | Large 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: | Mid-range expense. Lower cost per sampling point than separate single riser wells. |
Limitations:
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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