Looks to me like a Manitoba maple. Those fuckers are relentless, will grow absolutely anywhere, and are impossible to kill.
We have a sapling that rises up every year out of the storm sewer. So tenacious. The root system on that bad boy must be super developed by no.
Make a salt water solution, lots of salt in water. Then use a brush to brush on the solution to every leaf. Keep doing that for several days and it should die off. We did that one summer and it came back the next summer, did the same steps and has not returned since.
