ATCO Electric Ltd: Geotechnical Site Investigation

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ATCO Electric Ltd: Geotechnical Site Investigation

Overview

In October of 2012 under Stewart Weir (ZALIG Team) completed a geotechnical site investigation & report for a proposed expansion at the 707S St. Paul & 819S Whitby Substations on the behalf of ATCO Electric Ltd.

 

Project Goal

  • Determine the subsurface soil profiles and their geotechnical characteristics.
  • Groundwater and sloughing conditions. 
  • Field and laboratory investigation results for the design and construction of the proposed expansion.
  • Determine recommendations for frost heave protection and erosion control.
  • The investigation included drilling three boreholes to 15 m to 20 m below ground surface at 707S St. Paul and one borehole to 20 m at 819S Whitby Substation.
  • The substations were live energized stations that required the supervision of a qualified ATCO Electric Ltd. safety representative in order to monitor safe limits of approach.

Results

  • Onsite drilling of 4 boreholes was performed. 

Laboratory testing included:

  • Moisture Content ASTM D2216 (94 samples)

  • Sulphate Analysis ASTM 26/96 C1580 (8 samples)

  • Atterberg Limits ASTM D4318 (8 samples)

  • Unconfined Compressive Strength ASTM D2166 (5 samples)

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