Another wonderful basement floor job. I lifted the carpet squares to find 9x9 asbestos and a drainage trench across the center of the floor. Scraping off the "leveler", and it turned out to b joint compound that was used to feather a crown of concrete. Chipping hammer time.
Edit: light chipping on the crown only, plus scraping out the mud.
Edit: light chipping on the crown only, plus scraping out the mud.