By late October the oaks above Packanack Lake let go all at once, and the hillside lawns vanish under a week of leaves. Irrigation Systems of NJ works that turn of the year with cleanups, the last mowings, and edges cut back sharp before the ground hardens, then stays out for the plowing when the first storm crosses Passaic County. Snow up here slides; these driveways fall away toward the water and want salt as much as steel. Through the green months the routine is steady mowing and trimming, done on the same day each week. It is ordinary work, and doing it on time is most of what makes it good.