Didn't have a jackhammer, so I was patient.....

 I've seen this bit of brass poking it's threaded self out of the crosswalk for over a year, couldn't get it to budge, then eventually the tab on the side of it became visible, all the trucks driving over it.

THen it was really hot, so not only could I see the tab but the white goop of the crosswalk was also malleable in the heat, so wiped out the knife, and pried this sucker out of the ground, all that brass, mines...and the money to get from all that brass.

look at that bit of copper wire too.

 And if that was success enough, I found an "old timer" knife to go along with it....