The Alpharetta City Council has approved an $86,344 change order to add a left-turn lane on Rucker Road tied to the western leg of a proposed roundabout at Charlotte Drive.

The design modification to the Rucker Road Corridor plan puts the turn lane between Selbridge Way and North Hickory Trace, benefiting residents of the Old Station subdivision and providing a future left-turn lane off Rucker to a park to be developed at 850 and 860 Old Rucker Road, staff said in a report to the Council.

The roundabout was designed by AECOM as part of a previously awarded purchase order for the design of bridge replacements and roundabouts in the Rucker Corridor under the engineering consultant’s on-call transportation services contract.

The $86,344 will cover additional surveying, design plan modifications and state and federal permits. AECOM also will address concerns raised by the Georgia Environmental Protection Division about the project’s impact on an unnamed tributary of Foe Killer Creek parallel to Rucker. The total purchase order increases to $350,202 from $263,858, staff said.