The Haines Borough is taking a step toward addressing its dilapidated wastewater treatment plant, beginning with designs for more than $4 million in improvements.

The assembly approved a $113,000 design Tuesday, which will be completed by the Juneau-based firm Carson Dorn, Inc.

Improvements outlined in the design will include replacing control panels, lighting, pumps, building siding, polymer mixers, screens and other equipment. It also includes installation of two new blowers for a sludge aeration system…