| Use: | Designed specifically for ground water sampling. |
Description:
Gas-driven piston pumps consist of one or more plungers (pistons) moving inside a submerged cylinder or barrel. When gas pressure drives the piston up and down, one-way check valves direct water moved by the pistons to the surface. Flow rates easily controlled by varying driving gas pressure and a moderately high pumping rate at great depths allow for collection of large volumes of samples in a relatively short time. Piston pumps can provide a continuous sample over extended time periods.
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 | MINIMUM | Not Applicable |
No aeration of sample due to isolation from driving gas. Valve mechanism may cause series of pressure drops in sample leading to sample degassing and pH changes.
| Maximum Depth: | Up to 100 feet. Deep sampling locations require an air compressor or large compressed air tanks. Minimum well diameter: 1.5 inches. |
| Production Rate: | Sample is available after a short amount of time. 0 to 1.5 gallons per minute. Continuous sampling is possible. |
| 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: | Most expensive. |
Limitations:
ASTM Standards:
| D 4448 - 85a | Sampling Ground Water Monitoring Wells. |
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