Use: | Driven wells are used for small-diameter shallow water quality monitoring wells in unconsolidated material. Water samples can be collected at closely spaced intervals during drilling. This method is commonly used for water level observations. |
Description:
A screened well-point attached to metal casing (usually 1.5 to 3 inches in diameter) is driven by hand or by drive heads mounted on a hoisting device. A variety of driven devices available for collection of ground water samples are identified in Section 3.5.1
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 |
No drilling fluids are introduced to the formation. Steel casing might affect quality of samples, and there is no annular space for completion procedures. A good seal between casing and formation can only be expected if driving through loose, well sorted material that collapses around the well.
Maximum Depth: | Up to 100 feet. Generally 30 to 50 feet. |
Production Rate: | Sample is available quickly. |
Investigation Derived Waste Volume: | Small 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: | Least expensive. Relatively low cost of installation allows for multiple observation points. |
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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