The Merrimack draws the northern edge of Andover, and the pines above Deer Jump hold their snow long after the open fields have gone bare. El Chamo Tree Removal Services works the winter along those river-end streets, plowing driveways, opening walks, shoveling steps and sanding the places where meltwater freezes back overnight. River wind packs a drift hard against a garage door, and that is exactly the part no plow can reach and a shovel has to. They take storms as they come, through the night when the night is when it falls. The measure of it is a family stepping outside at seven and finding nothing at all in their way.