The builder was back yesterday to plow away the foot of snow we got on Wednesday. He plowed the driveway we have, another around the house to the backyard, and much of the backyard. The dining room part of the 1980 addition was apparently built without a proper moisture barrier between the foundation and the sill plates, so it had to go. As so it went today, along with the entire dining room floor above it.
It is all just as well since a new foundation pier needed to be dug through the dining room anyway. Also, all the rotten rim joist and sill at the rear of the (former) family room was removed.