Down at Deep River Landing the water runs wide and dark, and a storm crosses the river before it crosses the town, so the sky gives fair warning. Riverstone Landscaping LLC works those nights with plow and shovel — driveways, walkways, sand and salt on the slick pitch of a hillside drive — then meets the same houses again in May with mowers and trimmers. The reward hardly changes between the two: a drive opened to the pavement while the house is still asleep, a lawn edged so cleanly the walk looks wider than it is. Between the old rail line and the ridge there is barely a level lot in this town, which makes tidy work count for something. Cleanup rounds bookend the year, when the valley empties its leaves down every slope at once.