Appendix B - Geotechnical Investigation Report

 Log Column      Symbol       Definition

 Remarks          ‘V’ bit     Hardened steel ‘V’ shaped bit.
                 ‘TC’ bit     Twin pronged tungsten carbide bit.
                              Penetration of auger string in mm under static load of rig applied by drill head hydraulics
                  T60         without rotation of augers.
                Soil Origin   The geological origin of the soil can generally be described as:
                              RESIDUAL            – soil formed directly from insitu weathering of the underlying rock.
                                                    No visible structure or fabric of the parent rock.
                              EXTREMELY           – soil formed directly from insitu weathering of the underlying rock.
                              WEATHERED             Material is of soil strength but retains the structure and/or fabric of the
                                                    parent rock.
                              ALLUVIAL            – soil deposited by creeks and rivers.
                              ESTUARINE           – soil deposited in coastal estuaries, including sediments caused by
                                                    inflowing creeks and rivers, and tidal currents.
                              MARINE              – soil deposited in a marine environment.
                              AEOLIAN             – soil carried and deposited by wind.
                              COLLUVIAL           – soil and rock debris transported downslope by gravity, with or without
                                                    the assistance of flowing water. Colluvium is usually a thick deposit
                                                    formed from a landslide. The description ‘slopewash’ is used for thinner
                                                    surficial deposits.
                              LITTORAL            – beach deposited soil.




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