A $13 million project to build a long-planned sewer trunk line on Rohnert Park's east side is nearing its start date, ushering in, among other things, headaches for motorists.

The project is intended to spur housing and commercial development that needs the sewer capacity. That in turn, city officials hope, will provide the city an economic boost and generate development fees to pay for more infrastructure improvements.

In the meantime, motorists will be forced to adapt.

Between Oct. 28 and Nov. 11, signage and traffic diversions will go into place as work starts near Avram Avenue and Commerce Boulevard, said Patrick Barnes, deputy city engineer.

The exact traffic measures to be taken aren't decided. "That plan is being worked on," Barnes said.

The project is expected to last until late 2014. It is to extend from Avram and Commerce east to Alicia Drive to Seed Farm Drive. From there, the pipeline continues south under the rail tracks then east on Southwest Boulevard to Snyder Lane. It follows Snyder Lane south to East Cotati Avenue, where it ties into the existing sewer line.

The plan envisions maintaining two-way traffic and driveway access, but lane changes and reductions, as well as noise, will be noticeable impacts.

"Whenever we do a large utility project it is always best to find alternative routes if possible," Barnes said.

A project hotline has been opened at 540-9955.

The work is being paid for with a one-time payment to the city's public facilities fund from the Federated Indians of Graton Rancheria, owner of the casino set to open Nov. 5 on the city's west side.

You can reach Staff Writer Jeremy Hay at 521-5212 or jeremy.hay@pressdemocrat.com.