Changes

Hand auger - general

No change in size, 02:41, 17 July 2012

→‎Suitable conditions

Augers can be used up to a depth of about 15-25 meters, depending on the geology.

 

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- The borehole does not stay open if a collapsing sand layer is encountered below a clay layer (through which the temporary casing could not penetrate).

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==Construction, operations and maintenance==

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Winona

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