RFI 10.03.2020 - Appendix C - Memorandum cooroibah waterway crossing · MCU16/0099.01

Density of Non-cohesive Soil
                      Term          Symbol      SPT            Density        DCP (Blows /
                                                N          –   Index (%)      100mm)
                                                Value
                      Very          VL          <4             < 15           0 to 1
                      Loose
                      Loose         L           4 to 10        15 to 35       1 to 3
                      Medium        MD          10 to 30       35 to 65       3 to 8
                      Dense
                      Dense         D           30 to 50       65 to 85       8 to 15
                      Very          VD          > 50           > 85           >15
                      Dense


Note: Density only provided where in-situ testing is available.
Classification of Cemented Soils
Term            Symbol        Field Assessment
Weakly          WC
                              The soil may be easily disaggregated by hand in air or water.
Cemented
Moderately      MC
                              Effort is required to disaggregate the soil by hand in air or water.
Cemented




2.      Rock Description
Rocks are generally described in the borehole log using the following sequence of terms:
[Drilling Information]; [Rock Type, Colour, Structure]; [Rock Quality Designation]; [Defects]
[Weathering]; [Strength];

Rock Weathering Classification
Term                          Symbol         Definition
Residual Soil                 RS             Material is weathered to such an extent that it has soil properties. Mass
                                             structure and material texture and fabric of original rock are no longer
                                             visible, but the soil has not been significantly transported.
Extremely Weathered           XW             Material is weathered to such an extent that it has soil properties. Mass
                                             structure and material texture and fabric of original rock are still visible.
Highly           Distinctly   HW     DW      The whole of the rock material is discoloured, usually by iron staining
Weathered        Weathered                   or bleaching to the extent that the colour of the original rock is not
                                             recognizable. Rock strength is significantly changed by weathering.
                                             Some primary minerals have weathered to clay minerals. Porosity may
                                             be increased by leaching, or may be decreased due to deposition of
                                             weathering products in pores.
Moderately                    MW             The whole of the rock material is discoloured, usually by iron staining
Weathered                                    or bleaching to the extent that the colour of the original rock is not
                                             recognizable, but shows little or no change of strength from fresh rock.
Slightly Weathered            SW             Rock is partially discoloured with staining or bleaching along joints but
                                             shows little or no change of strength from fresh rock.
Fresh                         FR             Rock shows no sign of decomposition of individual minerals or colour
                                             changes.




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NOTES\EXPLANATORY NOTES AURECON 2018 V2 (002).DOC  26 February 2018  PAGE 3