Site Investigation...
Task / DescriptionSlow Ave Fast Units Pre Drilling, Rercussive or Rotary, soft deposits8.0 10.0 14.0 m/hr Pre Drilling, Wash Boring, grade V/IV rock2.5 3.2 3.9 m/hr Pre Drilling, Triple Tube Sampling, grade V/IV rock0.4 0.8 0.9 m/hr Pre Drilling, Rotary, grade III/II rock0.2 0.5 0.7 m/hr Pre Drilling, Triple Tube Sampling, grade III/II rock0.1 0.4 0.7 m/hr