At three in the morning the city goes as quiet as it ever gets, and that is when the plow work begins. Hartford Plow Guys LLC runs snow removal in New York, moving through lots, driveways and building approaches while the streetlights still hold the falling flakes. Storms arrive off the water here and stack against the buildings in odd drifts — deep along one wall, scoured bare along the next. Plowing, shoveling and salting a path before the first commuters step outside is the whole point: dark wet pavement instead of white. By the time the sun comes up over the East River the ground is open, and nobody has to give it a second thought.