Manhattan sits on black glacial soil, flat and deep, the kind that turns a lawn emerald in June and bone-dry by the third week of a July without rain. Chubasco Lawn Sprinklers keeps yards here on an even keel — regular mowing at a height the grass can stand, trimming and edging, clippings cleared away. Early morning is the hour for it, dew still holding along the blades and the air not yet gone heavy. Seasonal cleanups take care of both ends of the year, spring's debris and autumn's leaf fall. What the neighbors notice is a lawn that keeps its color and its lines straight through a Will County summer.