| Use: | A variety of multiple port casings have been developed that allow collection of samples from different levels. |
Description:
The simplest multiple-port casings involve field-fabricated multilevel samplers in which individual sampling points are screen rubber stoppers placed at intervals along PVC pipe flexible tubing that runs to the surface from each sampling point. In cohesionless sands, the formation collapses around the casing as a hollow-stem auger or drill casing is withdrawn from the borehole. In other formations, grout or inflatable packers can be used to isolate sampling ports. A suction-lift pump is used to obtain samples where the water table is shallow or a gas-driven piston pump can be installed by each port for deeper installations.
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 |
Cross-contamination of sampling points might occur as a result of leaky seals.
| Maximum Depth: | Up to 100 feet. |
| Production Rate: | Sample is available after a short amount of time. |
| Investigation Derived Waste Volume: | Medium 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: | Least expensive. |
Limitations:
EPA Guidance:
| EPA 600/4-89/034 | Handbook of Suggested Practices for the Design and installation of Ground- Water Monitoring Wells. |
| Previous Page | Sample Access/Collection Matrix | Sample Analysis Matrix | Home | Areas of Interest | Next Page |