A massive project to redo vintage water mains connected to the McTavish Reservoir on Dr. Penfield Ave. will result in significant traffic disruptions for the foreseeable future around parts of the downtown campus. The work, which begins Oct. 9 and which will last until at least August 2013, will see key conduits replaced as part of a $1.3-billion City of Montreal overhaul of the city’s leaky water network. Some of these big pipes are more than 120 years old. The Gazette reported on the project in some detail Tuesday, including the city’s plans for rerouting traffic on Dr. Penfield and on des Pins over the three phases of the work. If you can avoid driving in the area, between Peel and Park Ave., on Dr. Penfield and des Pins, your life will be easier for the next nine months.