Sampling Sequence:

A & B: Tool string is driven from ground surface to fill inner liner with soil.

C: Sample is retrieved with inner rod string.

D: New liner and additional lengths of inner rod and outer casing are added to tool string.

E: Tool string is again driven to fill liner with soil.

F: Second sample is retrieved with inner rod string.

This process is repeated until desired sampling depth is reached. When last sample has been retrieved, the outer casing is removed and bottom-up grouting is performed.