| Use: | A variety of direct drive samplers are available for shallow ground water monitoring. |
Description:
| Well point sampler: | Includes a screen, casing, and hardened point which is driven into the soil. The well point is left in place to function as a monitoring well. |
| Multiple port well point sampler: | A driveable well point, with multiple sampling ports separated by a sand matrix and caulking, is driven into the soil and a suction device is used to collect samples from different ports. |
| DMLS: | Consists of a 4.4-centimeter OD screwed, flush-joint steel casing, with sampling tubes on the inside of the casing, which are attached by pressure fittings to screened sampling ports at 25- to 38-centimeter intervals. It is installed by augering to the top of the desired depth of placement and driving the sampler to the desired depth. Water is pumped into the sampling tubes to keep the ports from clogging while the casing is being driven. Once in place, the auger hole is backfilled and sealed at the surface. |
| Hydraulic probe sampler: | A 0.75- to 1-inch outer diameter hollow probe with detachable drive points is hydraulically driven 2 feet below the water table. Ground water samples are taken using tubing placed down the probe and a peristaltic pump. |
| Hydrocarbon thickness probe: | A hollow steel rod with a circuit in the tip to sense the top of the water table is driven into the soil. A replaceable insert coated with indicator chemicals is placed down the tube. A horizontal slot allows petroleum products on the surface of the water table to enter the tube and react with the insert. |
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 | MODERATE |
Forcing probes into soils affects the soil density immediately adjacent to the well which could affect some downhole monitoring instruments.
| Maximum Depth: | Up to 100 feet. |
| Production Rate: | Sample is available after a short amount of time. |
| Investigation Derived Waste Volume: | Small 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:
ASTM Standards:
| D 6001 | Guide for Direct Push Water Sampling for Geoenvironmental Investigations. |
| Previous Page | Sample Access/Collection Matrix | Sample Analysis Matrix | Home | Areas of Interest | Next Page |