There was ~ 2 feet of soil before the shale rock. Pilot holes were drilled for all Ground Screws.
This image features 2 Ground Screws connected with a 1″x8″ steel plate, tightened down against an existing concrete block.
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On this project, Ground Screws were installed into the underlying shale rock and connected with 1″ steel plates to prevent the existing concrete anchor from moving.
Location: Napanee, Ontario, Canada
Ground Conditions: Overburden soil ~2 feet deep, then solid shale rock.
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