Direct Push Technology and Groundwater Profiling

The Johnson Company uses Direct Push Technology (DPT) to:

• identify and characterize subsurface contamination of unconsolidated deposits
• detail and profile groundwater
• obtain continuous soil cores, and
• install piezometers, mini-wells, and soil vapor points.

In addition to our specialized DPT rig, we have a portable scaffolding drive-platform for use in situations where access is limited, such as indoors or in forested settings, or in sensitive environments, such as wetlands or special habitat areas, where impacts from a drill rig would be detrimental.

Groundwater Profiling

The Johnson Company engineers and geologists use The Waterloo Profiler® to collect multiple discrete point samples of groundwater. This reliable tool quickly collects water samples from many points and depths, enabling the detection of discrete source zones and delineating the boundaries of a contaminant plume in three dimensions.  Results are more accurate and costs are lower than conventional monitoring wells and many other profiling methods.

Other unique and beneficial features of the Waterloo Profiler® include:

• Negligible cross contamination, even in extremely high concentration settings
• In-line flow cell minimizes volatile organic compound (VOC) loss by volatilization  
• One-trip profiling and grouting (no drill string removal between locations)
• Adaptable drive points for varying hydro-geologic and geologic conditions. 
• Hydraulic Conductivity Index (formation permeability) measured continuously
• Down-hole pump available when water table lower than suction limit of peristaltic pump, and
• Multiple profiling points can be advanced and sampled simultaneously to increase productivity.

Direct Push Soil Coring

We use either the EnviroCore® sampler or the Waterloo drive point piston coring tool to collect continuous soil cores up to five feet in length. No drill cuttings are produced, which minimizes potential hazardous waste.   Soil cores are collected in clear butyrate liners that are easily split with a knife for inspection or bulk sampling of the soils.  Discrete sub-samples can be collected through the core liner with a sub-coring tool minimizing exposure to the atmosphere.  These sub-samples, when preserved with methanol, provide a more accurate representation of VOC concentrations than conventional soil sampling techniques. 

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