Save the piece for later.
Cutting concrete slab for electrical conduit.
Use a chisel and hammer to remove the three scrap pieces.
In this video we are cutting concrete with a circular saw aka skil saw.
The blade that i am using is a bosch db741c 7 inch premium segmented diamond blade.
Step 7 backfill around the pipes.
Make a second cut inch away and parallel to the first.
Instead finish the cut with a utility knife.
The concrete will ruin your saw blade.
If you have installed any electrical conduit which does not require a pressure test tape the opening to the conduit closed with duct tape to prevent concrete from falling in.
Ridged nonmetallic pvc conduit is the right material for this job because it is watertight inexpensive and easy to work with.
Next cut out the exposed strip of plywood or osb that covers the slab but don t go all the way through.