I live in the city of Minnetonka, MN. The city has recently come up with a plan to redo the sewer and water main. In my front yard I have a silver maple which is approx. 9+ ft. thick (diameter) at 4 ft. up from the ground. Approx. 100 ft. tall. The sewer and water would be installed on the other side of the street, no need to remove the tree other than  proposed "curbs" which we have never had. I had some guys out from the U. some 30+ years ago when I bought the house. At that time they told me it was maybe the largest silver maple in the state. What can I do to stop the City of Minnetonka from cutting this wonderful tree down? Just to install a curb? Please, please HELP!! The neighbors have come over in tears with their support, the city board members are so arrogant.