One burger joint in Pittsburgh has repeatedly kept raw hamburger meat, lettuce and coleslaw at temperatures that allow bacteria to flourish. A chain restaurant’s worst violations in the past three years were a missing floor tile and a dirty floor drain. Both restaurants have maintained their approved-to-operate green stickers from the Allegheny County Health Department, but one would’ve earned a ‘C’ and the other an ‘A’ if the county’s attempts to institute a restaurant grading system had passed