Princeton Council voted unanimously Monday night to approve a bond ordinance improving the sewer main along portions of Snowden Lane and Van Dyke Road. The measure appropriates $775,000 but requires residents to contribute $34,000 each over a period of years.

The issue had been previously brought before residents at a neighborhood meeting. One person spoke at the Monday meeting against the proposal, which he felt was asking too high a cost of homeowners. But others urged Council to approve the project, which they said was needed for sanitary and health reasons.

The governing body also voted in favor of an ordinance to charge $750 for land use application fees. The measure will help cover the cost of engineering reviews and inspections for single family and two-family dwellings. Princeton’s Planning Board previously reviewed the proposed ordinance and found it was consistent with the town’s master plan.

Kristin Appelget, Princeton University’s director of Community and Regional Affairs, reported on a project to replace the green roof on Firestone Library, a project that will take five to six months to finish. Work is scheduled to begin on or about June 2.

The roof is on a building that was added to the library in 1988. Replacing it will involve removing vegetation and soils, Ms. Appelget said. A sculpture by Louise Nevelson that is near the building will be temporarily removed during the project. Vehicles will take the soil to a site in West Windsor, and then bring it back to the building once the roof is repaired. The hauling will only take place during the beginning and end of the project. Sidewalks will remain open.

The replacement is part of an ongoing renovation of Firestone Library. Phase Two, if approved, will begin next summer and involve the green roof of a 1971 addition to the complex. “Firestone is the largest building on campus and an overall refurbishment has been going on for years,” said Ms. Appelget. “We want it to be more inviting and make it a welcoming area near Nassau Street.” Councilman Bernie Miller commented, “This might be a good time to remind people that what they can see of Firestone is really the tip of the iceberg.”

The town’s engineering director Bob Kiser reported on the playground that will be on the grounds of the Avalon Princeton rental complex under construction at the site of the old Princeton Hospital. The area is less than half an acre in size and will be located at Franklin and Witherspoon streets. It will have benches and play equipment, and be open to the public, not just residents of the development. The playground is expected to be finished prior to when AvalonBay starts welcoming renters in the middle of August, Mr. Kiser said.

The next Council meeting is June 13.