| Use: | Most popular pump for collecting ground water samples dedicated to a single well. Should receive strong consideration when collecting trace inorganics and volatile organics. |
Description:
A flexible bladder within the device has check valves at each end. Gas from the ground surface is cycled between the bladder and sampler wall, forcing the sample to enter the bladder and be driven up the discharge line. The pumping rate of most bladder pumps can be controlled to allow for well purging at a high pumping rate or for the collection of VOCs at low flow rates.
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 |
Driving gas does not contact sample directly, thus aeration and stripping are minimized.
| Maximum Depth: | 100 feet plus. Minimum well diameter: 1.5 inches. Larger diameter (3.25 inches) is available. |
| Production Rate: | Sample is available quickly. 0 to 3 gallons per minute. Bladder pumps have a relatively high pumping rate when compared to other ground water sampling technologies. |
| Investigation Derived Waste Volume: | Medium 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: | Mid-range expense. |
Limitations:
ASTM Standards:
| D 4448 - 85a | Sampling Ground Water Monitoring Wells. |
| D 6232 | Standard Guide for Selection of Sampling Equipment for Waste and Contaminated Media Data Collection Activities. |
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