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3 ACCESS TOOLS

3.4 SAMPLING INSTALLATIONS for PORTABLE SAMPLERS

3.4.4 Nested Wells/Multiple Boreholes


Use: Sampling for vertical distribution of ground water constituents.

Description:

A series of single riser/limited interval wells is installed at different depths in separate, closely spaced, or clustered boreholes. Screened intervals can be placed to provide complete vertical coverage of the aquifer.

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. Well diameter limited by drilling method used.
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. More expensive than nested wells in a single borehole.

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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