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3. METHOD OF ADVANCING BOREHOLE



               • A borehole is a vertical hole advanced into the ground to determine the

                   depths, layers, zones, types, and thicknesses of the geomaterials (soil

                   and rock).


               • The quality of information obtained from various methods of advancing

                   the boreholes are varies with the character of the subsurface geologic
                   conditions.


               • The methods specified in the current specification:


                    •    Rotary boring
                    •    Rotary wash boring

                    •    Auger boring


               •     It may be necessary to use more than one method in advancing a

                    particular borehole.
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