Attachment 5 - Geotechnical Report · MCU18/0015

                                                 METHOD OF SOIL DESCRIPTION USED ON BOREHOLE AND TEST PIT
                                                 REPORTS
                              FILL                                                                      CLAY (CL,CI, or CH)

                              GRAVEL (GP or SW)                                                         ORGANIC SOILS (OL or OH or Pt)


                              SAND (SP or SW)                                                           COBBLES or BOULDERS

                              SILT (ML or MH)

Combinations of these basic symbols may be used to indicate mixed materials such as sandy clay.

CLASSIFICATION AND INFERRED STRATIGRAPHY
Soil and Rock is classified and described in Reports of Boreholes and Test Pits using the preferred method given in AS 1726 - 2017. The material proper-


                            PARTICLE SIZE                                                                              PLASTIC PROPERTIES

       Major
                       Sub Division                Particle Size
      Division

                Boulders                             >200 mm

                Cobbles                            63 - 200 mm

       Gravel               Coarse                  20 - 63 mm

       Gravel               Medium                 6.7 - 20 mm

       Gravel                 Fine                2.36 - 6.7 mm

        Sand                Coarse                0.6 - 2.36 mm

        Sand                Medium                0.21 - 0.6 mm

        Sand                  Fine               0.075 - 0.21 mm


                   Silt                         0.002 - 0.075 mm

                   Clay                             <0.002 mm

MOISTURE CONDITION FOR COARSE GRAINED SOIL                                     AS 1726 - 2017

Symbol                Term                                                     Description

D                     Dry                                                      Non-cohesive and free running

M                     Moist                                                    Soil feels cool, darkened in colour, tends to stick together

W                     Wet                                                      Soil feels cool, darkened in colour, soil sticks together, free water forms when handling

MOISTURE CONDITION FOR FINE GRAINED SOIL                                        AS1726 - 2017


Symbol                Term                                                      Description
W<PL                  Moist dry of liquid limit                                 Hard and friable or powdery
W = PL                Moist near plastic limit                                  Soils can be molded at a moisture condition approximately equal to the plastic limit
W >PL                 Moist, wet of plastic limit                               Soils usually weakened and free water forms on hands when handling
W = LL                Wet near plastic limit
W > LL                Wet, wet of liquid limit
CONSISTENCY TERMS FOR                               AS1726—2017                      RELATIVE DENSITY OF COARSE GRAINED SOILS                                   AS1726—2017
COHESIVE SOILS
                                                                                     Symbol                 Term                      Density Index %           SPT ‘N’ #
Symbol             Term                             Undrained Shear
                                                                                     VL                     Very Loose                Less than 15              0 to 4
                                                    Strength
                                                                                     L                      Loose                     15 to 35                  4 to 10
VS                 Very Soft                        0 to 12 kPa

S                  Soft                             12 to 25 kPa                     MD                     Medium Dense              35 to 65                  10 to 30

F                  Firm                             25 to 50 kPa                     D                      Dense                     65 to 85                  30 to 50

St                 Stiff                            50 to 100 kPa                    VD                     Very Dense                Above 85                  Above 50

VSt                Very Stiff                       100 to 200 kPa                   In the absence of test results, consistency and density may be assessed from correlations with
                                                                                     the observed behaviour of the material.
H                  Hard                             Above 200 kPa
     Explanation of Notes, Abbreviations & Terms Used on Borehole and Test Pit Reports                                                                               Date: 12/07/2018
     FRM-068
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