Why Combining Data Collection Tools Matters
Feb 19, 2019 -
To develop a successful remediation strategy, there must be a high level of confidence in site characterization data, but due to variability in subsurface conditions at most sites, conventional site characterization approaches can be time-consuming or require effort disproportionate to the ultimate remediation problem. This is often because of the number of boreholes that must be advanced and the multiple tools required. However, multi-sensor tools are quickly becoming a popular choice—they reduce the cost and time spent on advancing multiple boreholes, and allow complete data sets to be generated from a single advancement.
I will be hosting a webinar next week, Getting the Most Information From a Single Borehole Advancement, in which I’ll discuss this further and answer questions from participants.
In this blog post, I’ll discuss the multi-sensor tools that are currently available, how they save time and money, and the ways they can help streamline your site characterization efforts.
What Multi-Sensor Tools Are Available?
Many multi-sensor technologies have been made commercially available by Geoprobe, including the Membrane Interface Probe (MIP), electrical conductivity probe (EC), Hydraulic Profiling Tool (HPT), Optical Image Profiler (OIP), and OIP-Green. Others, such as the Waterloo Advanced Profiling System (WaterlooAPS)—offered only by Cascade—and other available laser-induced fluorescence (LIF) technologies can be combined to produce high-resolution characterization data with a minimal number of boreholes, making quality characterization work possible even on small sites.
Tools like the WaterlooAPS/EC and WaterlooAPS/Ultra Violet Optical Screen Tool (UVOST) were originally created for specific situations, but we have successfully combined them as, together, they have broad potential for environmental assessment.
How Do Multi-Sensor Tools Save Time and Money?
The “stacking” or combination of sensors on a single drill string reduces the overall duration, and therefore cost of these field data collection efforts. In addition, it ensures the data from the stacked sensors are collecting vertical data from the exact same horizontal location. With most of these tools, a surrogate for contamination is logged, and the additional sensor is collecting data on the hydrogeologic environment that the contaminants are present in. These data in combination are critical for the design of an effective remediation strategy. Historically, remediation programs relied on large scale hydrogeologic measurements. More recently, we as an industry have come to realize that small scale heterogeneities control the remedies that are often constructed on sites.
How Do Multi-Sensor Tools Streamline Site Characterization?
The use of multi-sensor tools eliminates the need for having multiple drill rigs on site. This consequently reduces the need for scheduling and coordination between drilling crews, the work footprint, the number of people required on site, and the health and safety issues that arise when you increase the number of tools and crews.
There’s a reason multi-sensor tools are quickly gaining popularity.
If you have never worked with multi-sensor tools (or even if you have) and would like to learn more for an upcoming project, sign up for our webinar.
ABOUT THE AUTHOR
Michael Jordan no longer works at Cascade. He has more than 20 years of experience designing, managing, and executing subsurface investigations, and has utilized a variety of drilling technologies and data collection systems.