- Casey Moore
If you’re new to the environmental services field, there are probably tools you haven’t had a chance to use, and you’re not entirely sure what they do or when to utilize them. One such tool is likely the WaterlooAPS.
In this blog post, I’ll provide a basic explanation of the technology, how it works, and when you should consider it for your high resolution site characterization (HRSC) needs.
The Waterloo Advanced Profiling System™—or WaterlooAPS—is a specialized HRSC tool that measures hydrostratigraphic data while collecting multiple discrete groundwater samples in succession from a single advancement. It was designed to collect more data in less time (and with fewer associated costs) than traditional methods.
Because it collects groundwater samples via low-flow sampling and those specimens are analyzed by a laboratory, the data generated is considered representative and defensible characterization for most groundwater contaminants.
The WaterlooAPS is most often used in conjunction with a direct push technology (DPT) platform, but can be advanced using cone penetration testing (CPT) rigs. Regardless of method, the WaterlooAPS technology functions in the same way. As the tool advances, clean water is injected into the subsurface via stainless steel tubing and the tip of the probe. Simultaneously, the depth, pressure and flow rate are all being monitored and recorded in a continuous log of the relative permeability, which is used to determine preferred intervals for groundwater sample collection.
When the WaterlooAPS probe has reached the appropriate depth and is ready to collect samples, the flow through the tip is stopped, and groundwater is then purged back in via a peristaltic pump or gas drive evacuation method. The groundwater samples are collected from an in-line sampling jig that precedes the water quality meter flow-through cell, which ensures that if volatile organic compounds (VOCs) are collected, they are never exposed to ambient air or system components that would risk cross contamination.
There are many types of projects where the WaterlooAPS can provide valuable data, but a few of the most common scenarios include:
The WaterlooAPS is really the premier HRSC tool when measuring hydrostratigraphic data, but it also has the capacity to save time and money if you know which projects it’s most suited for.
If you’d like to learn more about it, download our technology overview.
If you think you’d like to use it on a project, request a quote.
Casey Moore is a Project Manager at Cascade, where he specializes in projects involving HRSC. He’s worked in the environmental services industry for 10+ years, and is the resident expert on the WaterlooAPS technology and best practices.