Anyone who lives near Indian Brook knows the two sounds of an Essex year: water moving under the ice in March, and mowers running up and down the neighborhoods by the last week of May. Bevins Property Maintenance keeps both ends of that calendar, plowing driveways and clearing walks all winter, then mowing, trimming and cleaning up yards once the ground firms. A driveway opened while the house is still dark is a small gift to whoever has to be at work by seven. A lawn with a true edge along the walkway is the same gift in July. Between the reservoir trailheads and the roads out toward Westford, that is the whole job: show up, do it right, leave the place looking better than the weather intended.