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PowerProbe 1 1/4" Expendable Tip Soil Gas Sampler

The expendable tip soil gas sampler is small-diameter tooling consisting of direct push extensions with drive tips. The tooling is driven into the subsurface through the direct push of the PowerProbe™. When they are at the desired depth, the drive point is detached by pulling back on the tooling, exposing an inlet section with a screen. The purging and sampling may begin using an AMS vacuum station, vacuum pump or other sampling instrument.

PowerProbe Soil Gas Sampling and Monitoring with Direct Push

Soil gas samplers are used during soil gas surveys and/or active soil gas investigations to discover information about soil and groundwater contamination, primarily volatile organic contaminant (VOC) levels. The ability to detect elevated VOC levels in soil gasses allows investigators to pinpoint locations for future soil and groundwater sampling.

Features:

• Provide valuable data on the distribution and concentration of VOCs in soil and groundwater
• Rapidly collect the sample at specific depths
• Penetrate to sampling point quickly
• Easy to use and easily adapts to existing tooling
• Inexpensive survey tool for sample collection from shallow depth well to beyond 50 feet below ground surface
• Use in a wide variety of methods
• Use telescopically through AMS hollowstem augers and dual tube sampling systems

Monitoring Soil Gas
AMS PowerProbes can be used to install soil gas monitoring systems, including soil gas monitoring wells, around underground storage tanks or as part of an ongoing remediation efforts. Soil gas monitoring systems are used for long-term soil gas monitoring and repeated sampling of volatile contaminants in the vadose zone. They act as an active method for soil gas retrieval which can be used in all phases of a soil gas investigation. Soil gas monitoring wells are not recommended for obtaining screening-level analytical data for soil gas surveying.

Benefits include:

• Installation in a variety of subsurface lithologies to depths up to 100 feet bgs
• Long-term installation that allows repeated sampling of the same location
• Representative sample collection, useful for soil gas monitoring programs

Recommended Soil Gas Monitoring applications:

• Soil gas vapour monitoring wells
• Soil gas samplers offered by AMS can be established as long-term installation for monitoring soil gas vapour

Single Tube Procedure:

Designed to be pushed single tube without pre-boring and collect a point source soil gas sample. Separate the expendable tip from the direct push rods once you have reached the desired sampling depth, and then withdraw the rods a few inches to expose the soil. A vapour sample is collected using a vacuum pump and tubing that opens into the sample chamber. To sample deeper, the probe must be withdrawn and another expendable tip attached.

Recommendation: Use the 1 1/4" or 1 5/8" expendable tip for a single tube install.

Telescopic Procedure
While soil gas collection is easily done through an open borehole, the collection of soil gas using a cased, dual tube system or hollowstem auger will allow for the sampling inlet to be isolated at a specific depth and minimise the chance of cross contamination.

Recommendation: Use the 1 1/4" or the 1 5/8" expendable tip for a dual tube install.

• Drive down with dual tube system
• Pull out internal dual tube components
• Drop bentonite
• Hydrate with water
• Drop the single tube down
• Push through bentonite, generating a seal
• Purge the ambient air at a low flow
• Finish by extracting the sample using a low flow vacuum

Long-Term Implant Installation Procedure:

Implants for long-term soil gas monitoring can be installed either with the single tube or telescopic direct push procedures. Once the direct push tooling used to install the implant is pushed to the chosen depth, the implant is then placed through the tooling. The tooling is retracted and the implant is isolated at the chosen depth, and then completed similar to a procedure that would be used to install a groundwater monitoring well.