Think of it like a hole in the ground, bowl shaped, filled with wet/chunky cement. You need to get the cement out, but leave the earth as is, until the majority is out. Then figure out how to clean it all off the dirt. You don't want to disturb the earth any more than necessary, but you have to clean out all of the cement. Some may eventually need scraped, but get the main stuff out first, then reevaluate.