| Use: | Single riser/limited interval wells are suitable for any type of formation and generally easier to install, pack, and seal than multilevel installations. |
Description:
A borehole is drilled to the desired depth in an aquifer, and a short to moderate length screen (usually 3 to 10 feet) is installed. This method of installation eliminates the potential for vertical cross-contamination between sampling points due to leaky seals (a limitation of nested wells/single borehole installations) and provides maximum flexibility regarding well diameter.
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. |
| Production Rate: | Sample is available quickly. |
| 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: | Mid-range expense. High cost per sampling point compared to multilevel installations, especially at increased depths. |
Limitations:
ASTM Standards:
| D 5092 | Practice for Design and Installation of Ground Water Monitoring Wells in Aquifers. |
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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