A hard cold snap settles into the valley and simply stays, the kind of stretch where snow squeaks underfoot and nothing melts for days. Roto-Rooter Plumbing & Drain Service runs snow removal through those spells — plowing lots and drives, clearing walkways, and treating the ice that forms in the shade of a building and refuses to give it up. Night work is part of the arrangement, because storms pay no attention to business hours. The measure is whether a place is open and walkable when the first person shows up in the morning. That is worth getting out of a warm bed for.