Workers with Swank Enterprises pour a concrete lid Wednesday for the primary digester at Kalispell’s wastewater treatment plant. Half of the lid was poured last week, and remaining sections were finished Wednesday. The digester handles corrosive methane gas generated as part of the treatment plant’s solids reduction process and is getting an $863,000 overhaul. Financing costs and contingency reserves push the total estimated cost of the project up to about $1.2 million. Work on the primary digester should be finished by year’s end.