Question $6($Mandatory$)$

$\frac{0}{2}$ points

Match the condition with the influence on the SPT $N-$value

$q,$ Hammer weight is too high $(>140$ LB$)q,$ Careless measure of drop height of hammer $q,$ Hammer strikes drill rod collar eccentrically $q,$ Use of bent drill rods

Increases SPT N$-$value

Decreases SPT N$-$value

Failure to maintain adequate column of water

$q,($fill the casing or hollow stems with water$)$ in borehole prior to driving sampler $q,$ Inadequate cleaning of hole