A three-day storm on the Androscoggin above Deer Rips is a wall of white with no far shore in it at all. St. Laurent and Son Excavation, Inc. runs heavy iron through weather like that around Lewiston — plowing driveways and lots, pushing banks back, loading and hauling snow off site, sanding and salting the ice underneath. When the drifts get past what a pickup can argue with, the answer is a bucket and somewhere to put it. Dawn to dawn, the aim never changes: open ground, wide entries, and room held in reserve for the next one. When it finally quits, the place looks like nothing happened.