The City Council at its meeting Thursday is set to consider final approval of a request by Mayor Kimberley L. Driscoll to bond $1.9 million for major improvements to Bertram Field, the high school football field complex. The council gave initial approval of the bond by a unanimous vote on May 9. A state grant awarded to the city would fund $400,000 of the project cost. The proposed improvements include replacing the existing grass field with synthetic turf in order to improve its durability and save on maintenance costs, according to Dominick Pangallo, the mayor’s chief administrative aide. The track surrounding the field would be resurfaced and extended to the regulation length of 400 meters. Other upgrades would include installing a new wireless scoreboard and a new flag pole. The project, if approved, is targeted to begin July 1 to allow for work to be completed by the end of September, minimizing interference with the fall sports season.