A bedroom had been added onto a 55-year old San Leandro house. As the home inspector walked across the floor – there was a discernible sag/slope in the center of the room.

A large steel ball bearing was placed at the baseboard and it rolled slowly towards the center of the room in a spiral pattern – very odd.

The inspector entered the crawlspace under the bedroom sweeping the flashlight in front of him. What greeted his eyes was a wood support post, a concrete pier and footing floating above a large hole.

It turns out the bedroom had unknowingly been built over an abandoned Redwood septic tank where the lid had collapsed.

Before concrete, plastics, metal… early septic tanks were made from Redwood boards.

Now you know the rest of the story.

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