At the former Nunes Dairy, on the far edge of the Point Reyes National Seashore, the barn floors have been stripped down to bare concrete. One manure pond has been emptied to its earthen bottom; another holds a shallow, glassy pool that reflects the late November sky. The acrid smell that once hung over the place has dissipated.
William Nunes, who operated the dairy until this fall, said the final cleanup took weeks. “We…