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3. METHOD OF ADVANCING BOREHOLE




         •     Rotary wash boring

              •    Rotary wash boring involves drilling a borehole into the ground using a

                   rotating steel casing. The process uses drilling fluid (usually water) to

                   flush away soil and create the borehole.

              •    The drilling machine rotates the steel casing while the fluid washes away the

                   soil, allowing access to deeper layers of the ground.


              •    Cuttings are removed from the hole by the circulating water.

              •    As the process continues, additional casing pipe and drill rods are added to

                   develop the borehole further.
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