North of the village the New Croton Reservoir sits behind its stone dam, and in November the water there goes the color of slate an hour before the sky does. That's the signal around Ossining: cleanup season closing, plow season loading. Belloso's Construction & Landscaping Corp works both ends of it — mowing, trimming and full property cleanups while the ground is soft, then plowing, shoveling and salting once it isn't. Nothing feels better on a raw morning than a drive cleared curb to garage with the walk salted beside it. The work runs through Ossining and out along the reservoir roads to the towns that share them.