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What is the Snap Sampler?

In 2018, QED Environmental Systems, Inc. acquired the Snap Sampler technology from ProHydro, Inc., the developer of the Snap Sampler passive groundwater sampling method.  The Snap Sampler is a patented (US Pat. 7,178,415) groundwater sampling device that employs a unique double-end-opening bottle with “Snap” sealing end caps. This dedicated, in-well equipment is deployed at the desired position in the screen interval with up to six Snap Samplers and six individual sampling bottles. The design allows for the collection of groundwater samples which are in dynamic equilibrium with the aquifer through a simple, no purge/passive technique.

To operate, Snap Samplers are loaded with Snap Sampler bottles and the "Snap" caps are set into an open position. Samplers are deployed downhole with an attachment/trigger line and left to equilibrate downhole for days, weeks, months—even possibly a year or more.  Depth is not known to be limited, with current maximum depths of collection in excess of 2000 feet/600 meters.  To collect samples, the Snap Sampler bottles seal under the water surface by simply pulling the mechanical trigger line or pressuring up the pneumatic trigger system. The trigger releases "Snap Caps" that seal the double-ended bottles. The end caps are specially designed to seal the water sample within the bottles with no headspace vapor. Once the closed vial is retrieved from the well, the bottles are prepared with standard septa screw caps and labeled for laboratory submittal.

Bottles are available in glass 40ml VOA vial size or HDPE 125ml and 350ml sizes. The 40ml VOA vial can be used directly in standard laboratory autosampler equipment. With Snap Sampler VOA vials, the groundwater sample is never exposed to the open air from the point of collection downhole to the gas chromatograph. The 125ml or 350ml Poly bottle also seals in situ. The plastic bottle can be used for larger volume collection and for metals or other analytes where a plastic bottle is preferred. For non-volatiles, this bottle can be opened at the well head to combine in a larger bottle, transfer to a glass bottle (e.g. for SVOCs), or just to remove the internal spring before acidifying a metal sample. Snap Samplers with 40ml and 125ml bottles fit in 2-inch or larger monitoring wells. Snap Samplers with 350ml bottles fit in 4-inch or larger monitoring wells.

Why choose the Snap Sampler?

What are the advantages?

1. No-Pump, No-Pour groundwater sampling is faster and generates no purge water waste.

2.  All critical actions take place submerged in the well, which limits the impacts of: heat, wind, rain, surface contamination, or off-gassing losses.
3. Improved sampling consistency since variations in site conditions from season-to-season or changes in personnel from event-to-event do not affect the sample collection process.
4. There is no heavy equipment to carry and no drums to move.

Simplicity, Utility.

1. Easier and faster than well purge methods.
2. Passive sampling without analyte limitations. Test MTBE, MEK, SVOCs, and metals.
3. Passive, no-purge sampling is gaining acceptance and is recognized as a major money saver!
4. Limited tools needed.

Better Samples.

1. Fewer sources of variability.
2. Improved sampling consistency.
3. Quicker determination of monitored natural attenuation or remedial effectiveness.

Cost Savings.

1. Reduce time to collect each sample to as little as 10 minutes.
2. Eliminate most major equipment needs--no pump, no pump controller, no generator, no flow-through cell, and no purge waste containers.
3. Deploy next quarter's samplers during the same mobilization.

To find out how much cost savings you could achieve, See our SNAP example Cost Calculator...


Snap Sampler SOP

The Snap SOP is modeled after USEPA's 2002 ground water sampling guidance for RCRA and Superfund project managers.

To learn even more details about using the Snap Sampler and how it easily fits into a typical monitoring program...


Download our Standard Operating Procedure:


Plus field guide appendices:


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