Page 54 - PENYIASATAN TAPAK

6. SAMPLING IN BOREHOLES

• Sampling procedures using thin-walled sampler:

• Drill a borehole to the desired depth for sampling.

• Remove the drill tools and lower the sampler to the bottom of the hole.

• Thin-walled samplers are pushed into the soil using continuous static

thrust.

• Note that this method is not suitable for soils containing gravel or

large particles or extremely hard soils.

• After sampling, handle the thin-walled tube with care to prevent

disturbance.

• Apply a layer of microcrystalline wax to the exposed end of the

sample tube