They are perhaps the most distinctive features of the San Onofre Nuclear Generating Station — the pair of containment domes from Units 2 and 3, rising nearly 200 feet above the ground on the northern edge of San Diego County that every motorist sees on the drive along Interstate 5.

But in about six years, the twin domes will be gone — obliterated — provided the schedule holds true for dismantling the now-shuttered plant, known as SONGS