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Frost line issues

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I am seeking advice regarding footings and the frost line.  I am aware that
footings need to be founded below the design frost line.  If a tank for
example is placed on a mound of compacted fill, is the frost line measured
from the new ground surface local to the tank, or from the existing ground.
I suspect from the new ground level, as the backfill insulates the existing
ground.  I saw a strange sketch, which shows tank foundations being carried
through the backfill and well into the existing ground, for a project being
considered in Mongolia.

Any comments regarding the frost line would be appreciated - here in Perth,
Western Australia, it rarely falls below 5° outside!

Dave Meney
Yenem Engineering Services
54 John Street
Gooseberry Hill WA 6076

Phone: 9257-2695
Fax: 9257-2264
Mobile: 0417-949-374
e-mail: yenem(--nospam--at)