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[Carruthers]

Originally Posted by xoxoxoBruce

An underground fuel tank won't stay underground if it's empty and there is ground water to float it up.

At sewage works in the UK the large circular tanks are never completely emptied to avoid the possibilty of them floating on ground water and being damaged. When being cleaned or serviced they have clean water pumped in as ballast.

None of you knows how long I've been waiting to share that fact.

[xoxoxoBruce]

Originally Posted by Carruthers

At sewage works in the UK the large circular tanks are never completely emptied to avoid the possibilty of them floating on ground water and being damaged. When being cleaned or serviced they have clean water pumped in as ballast.

None of you knows how long I've been waiting to share that fact.

When I worked at Westinghouse they closed down one of the power plants. There were two underground oil tanks of over 25,000 gallons (never did find how much over), and since the ground was about six or seven feet above the river it's a good bet the ground water level was that high. If they popped up they would have to be decontaminated and disposed of which is a very expensive process.
They had ready mix concrete trucks lined up for a half mile in both directions to fill both tanks.