A list of projects on the state’s website for CT2030, which is Gov. Ned Lamont’s transportation plan for the next 10 years, says the Route 8 and Interstate 84 interchange reboot will cost $235 million to $260 million. Project overseers say added costs are typical of a rehabilitation project, as discoveries of additional needs are common after work begins. The scope of the rehabilitation has expanded since workers broke ground in June 2018. Still, when the project is finished, the network of ramps and bridges that comprise the Mixmaster will be configured the same way they are now — but with fresh asphalt and concrete, and a like-new appearance. The rehabilitation project is on schedule to be finished by September 2022, the DOT said.