Abstract

Overdesigned dewatering systems result in on-site waste, in terms of space, energy, operations and cost. This webinar presents a modern approach that leverages a High-Resolution Site Characterization (HRSC) tool that can be used to more accurately and abundantly collect site data for the purposes of designing and installing appropriate and effective dewatering systems.

Current industry methods for estimating hydraulic conductivity (K) and construction dewatering volumes include grain size analysis, single well response testing, and potentially pumping tests. These methods typically rely on a limited number of monitoring wells installed within discrete screen intervals to provide representative estimates of groundwater flow across potentially highly heterogenous geologies on a single Site. A typical construction site dewatering plan is based on data points from less than ten wells. Errors in data collection and data processing can result in inaccurate estimates of K and dewatering flow rates impacting project costs and timelines.

The Hydraulic Profiling Tool (HPT) is capable of enhancing hydrogeological investigations and improving the design and implementation of remedial/dewatering programs. The HPT is a direct-push tool that collects real-time soil permeability and electrical conductivity (EC) data on a high-resolution scale (e.g., every cm). Whereas a typical slug test over a 3 m screen yields a single interpreted K-value data point, a typical HPT probe over a 3 m interval yields 305 interpreted K-value data points. Real-time data collection via HPT allows for adaptive field programs where unexpected subsurface observations (e.g., highly conductive seam) can be investigated same-day, rather than requiring multiple rounds of drilling.

This presentation summarizes two sites where HPT characterization was utilized, in conjunction with traditional Hydrogeological Assessments, to enhance the hydrogeological characterization and help improve the remedial/dewatering design.

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