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Water tank center column support

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Is there a typical way to support a center post for a
ground level water tank?  Diameter = 40'+-, height =
32'.  The perimeter sits on a concrete ring wall
bearing on rock.

Is a concrete pad/pier/footing usually used under the
center column?  If so, is the bottom plate supported
directly on the concrete (with liner) or is the
concrete set lower and covered by the layer of sand

Geotechnical issues are not a concern, the soils can
take plenty of load without displacement.

Jim Wilson
Stroudsburg, PA

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