The Helderbergs sit on the western horizon, and the wind that spills down off that escarpment finds every unswept corner of the city. Bubonia Holding Corporation plows and salts through those nights. Clear the drive, open the walk, break the ice sheet that forms when a thaw refreezes at two in the morning. It is unglamorous work, and it is the difference between an ordinary Tuesday and a bad one. Albany takes its share of snow each winter, and the route runs as long as the storm does.