Hello. Thank you for choosing Just Answer! My name isXXXXX am here to help you with all your electrical needs. If the contractor used Type UF cable then it is NOT permitted to be embedded in concrete. NEC 340.12 Uses Not Permitted, (8) Embedded in poured concrete, or aggregate, except where embedded in plaster as non heating leads where permitted in 424.43.
So, I am going to assume he used this type of wire, until you tell me otherwise, since it is the most common. You can check this by looking at the outer jacket of the wire and there will be a stamping of the Type. He should have used conduit as a sleeve through the column.