Slope Stability Report

Dean & Vanessa McDonald                                                                      21505-001-Rev0
                                                                                             4 February 2022

2.0      DESCRIPTION OF EXISTING CONDITIONS
2.1    Geology
The 1:100,000 scale Gympie Special Geological Map (Sheet 9445 and Part 9545) indicates that the site is
underlain by early to middle Triassic age phyllite (Rk) of the Kin Kin beds. An inferred fault (dashed black
line) is indicated on the mapping approximately 100 m west of the subject site. An extract from the
geological map is shown in Text Figure 3 below.




                                                 Approximate site location




Text Figure 3: Extract from geological map
At the time of the assessment, the upslope shed cutting ranged up to about 4.5 m deep and typically
exposed topsoil to 0.1 m below ground level (BGL), then residual clays up to 1.0 m BGL overlying very low to
low strength phyllite tending towards medium strength with depth. Text Figure 4 below shows the upslope
cut batter at the time of the assessment.

        Residual clay soils




                                                              Very low to low strength
                                                              phyllite grading to
                                                              medium strength



Text Figure 4: Upslope building pad cut batter




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[OCR of page images]
Dean & Vanessa McDonald 21505-001-RevO
4 February 2022

 

2.0 DESCRIPTION OF EXISTING CONDITIONS

2.1 Geology

The 1:100,000 scale Gympie Special Geological Map (Sheet 9445 and Part 9545) indicates that the site is
underlain by early to middle Triassic age phyllite (Rk) of the Kin Kin beds. An inferred fault (dashed black
line) is indicated on the mapping approximately 100 m west of the subject site. An extract from the
geological map is shown in Text Figure 3 below.

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Text Figure 3: Extract from geological map

At the time of the assessment, the upslope shed cutting ranged up to about 4.5 m deep and typically
exposed topsoil to 0.1 m below ground level (BGL), then residual clays up to 1.0 m BGL overlying very low to
low strength phyllite tending towards medium strength with depth. Text Figure 4 below shows the upslope
cut batter at the time of the assessment.

 

Text Figure 4: Upslope building pad cut batter

 

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