Mike, I think thats just for the L.A. city area.(Oaks are county wide) Were removing 6 sycamores in Pomona, so I've been researching a little. If I am wrong feel free to correct me.(and save me some grief)
It is a misdemeanor in L.A. (city)to remove, or change the grade, ect. of an Oak, or sycamore racemosa without the proper permit.
There is also rumor that they may soon add an amendment that will require you to replace the engine in your chipper/stumpgrinder every two years. Sort of like Japan.
The Santa Ana botanical gardens was already giving notice not to use their chuck and dive chipper any more or they would be cited. Their budget is already low. Now they lost the ability to do routine maintenance themselves.
When is it going to stop?