Phase four of Ketchum's municipal improvement system made good progress Monday chugging up Knob Hill. In fact, job foreman, Jonathan Lunceford reported Tuesday that 275 feet of trench was dug on Walnut Avenue from 6th Street, going north, taking the trench up to the peak of Knob Hill. Sub-contractor Burks Excavation needed to bring in a trencher owned by Lafferty Construction after hitting a seam of solid bedrock. The project's mission is to replace an old steel water main with a new eight-inch PVC main, burying the pipe six feet deep so that it does not freeze during wintertime. Lunceford, left, discusses the project's progress with Ketchum Utilities field supervisor, Dave Rambo, while Lafferty Constructions Sam Thomas drives the trencher.