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3. METHOD OF ADVANCING BOREHOLE




         •     Auger boring

              •    Auger boring is commonly used for

                   shallow or large depths.

              •    An auger (a helical drill bit) is

                   rotated to excavate the soil.


              •    It is effective for softer soils and can

                   be used to collect soil samples.

              •    There are two types of augers: solid-

                   flight augers and hollow-stem augers.










                                                                                                                    (Source: Jeff Farrar)
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