We did one that was a leaking 500 gl underground tank. The engineer estimated it had been leaking for 3 to 5 yrs. Had to jack the house up and remove the basement concrete floor, remove 500 cu yds of soil underneath & around foundation, remove 2 60 ft oak trees that sat in contaminated soil outside the foundation and replace with like trees (owner demanded), repour new basement floor, reset house on foundation, relandscape. $1.5 million from ins co.
After thinking about it, I’m going to replace my tank next spring. It is about 32 yrs old, in a shed with poured concrete floor but even so probably near end of life.
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