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3 ACCESS TOOLS

3.4 SAMPLING INSTALLATIONS for PORTABLE SAMPLERS

3.4.1 Driven Wells


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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