Environmental Engineering Reference
In-Depth Information
FIGURE 2.51
Rotary drill rig advancing boring with the continuous hollow-stem flight Auger.
2. Drive “starter” casing or drill hollow-stem auger to 5 ft penetration (1 m pene-
tration in metric countries).
3.
Fragment and remove soil from casing to a depth of about 4 in. (10 cm) below the
casing to remove material at sampling depth, which will be disturbed by the force
of the plugged casing during driving. Completely disturbed “wash” samples (cut-
tings) may be collected at the casing head for approximate material classification.
