Solinst - Model 660 - Drive-Point Groundwater Profiler
The 660 Drive-Point Profiler allows collection of groundwater samples from multiple points, at discrete zones, in a single drive. This allows a detailed vertical profile with only one drive of the rig. The profiler tip is connected to a Peristaltic Pump which flushes the profiler tip with de-ionized water during driving to prevent cross contamination and is reversed to obtain a sample. It allows detailed plume delineation quickly and inexpensively. An expendable grout tip is available to allow easy decommissioning.
The Model 660 Profiler is designed to collect samples from multiple points in a single drive/drilling location, at discrete zones. It allows contaminant vs. depth profiling and detailed plume delineation. The profiler has a 1.75' (45 cm) dia. AW stainless steel tip with one row of screened inlet holes set circumferentially; holes lead to single stainless steel, LDPE, or Teflon sample line.
The Model 660 Profiler is designed to be a preliminary site assessment tool. It enables the collection of groundwater samples from multiple points in a single drive/drilling location, at discrete zones. Profiler transects allow:
- high resolution sampling
- contaminant vs. depth profiling
- detailed plume delineation
The Drive-Point Profiler was originally developed at the University of Waterloo and is described in various papers. A rig pushes, vibrates, or hammers the Profiler and attached AW rod to the desired depth.
The Profiler is 1.75' (45 mm) in diameter, stainless steel, with a row of screened inlet holes set circumferentially. The inlet holes lead to a single stainless steel fitting, where 4 mm LDPE or Teflon sample line leads to a Peristaltic Pump at surface.
To avoid downward drag and cross contamination, the Profiler system is flushed with deionized water using a Peristaltic Pump while it is being driven between sampling zones.
When the desired depth is reached, the pump flow is reversed. The resulting water flow to surface is monitored for clarity and conductivity. When all deionized water is removed from the system and purge parameters have stabilized, the sample is taken.
After sampling, the water flow is reversed and once again deionized water is used to flush the Profiler tip, to keep it from clogging. Tests have proven virtually no ‘drag down’ if correct procedures are followed.
Drive-Point Profilers are not suitable for all sites. Depth limitations vary with soil conditions and the drive technology used. Using a peristaltic pump to flush and sample is effective if the water level in the borehole is within 26 ft. (8 m) of surface.
There is no minimum separation between sample depths, which makes the Model 660 ideal for high resolution profiling.