Slope Stability Report

GEOLOGY: (Qpd/2) Quartz Sand
Location: Lot 22 on CP908656 (No.24) Comet Drive, Sunrise
Beach Qld 4567
1. Natural Surface Slope                                    8. Slope of Cut Face
                                                              Area                             Level   Factor
  Area                                  Level   Factor
                                                              x      Less than 30 Degrees       L       0.5
           Less than 5 degrees           L       0.1
                                                                     Between 30 and 45          VH       1
  x        Between 5 and 15              M       0.5
                                                                     Degrees
           Degrees
                                                                     Between 45 and 60          VH      1.5
           Between 15 and 30             M       0.8
                                                                     Degrees
           degrees
                                                                     Greater than 60            VH       3
           Between 30 and 45             H       1.2
                                                                     Degrees
           degrees
           More than 45 Degrees          M       0.8
                                                            9. Material in Cutting
                                                              Area                             Level   Factor
2. Slope Shape
  Area                                  Level   Factor               High Strength Rock          L      0.5
           Crest or ridge                L       0.7                 Medium Strength Rock        L       1
           Planar/ Convex                M       0.9                 Low Strength Rock          M       1.2
  x
           Rough/ Irregular              M       1.2                 Very Low Strength Rock     H       1.5
                                                                     and Soil
           Concave                       H       1.5
                                                              x      Soil                       VH       2

3. Site Geology
  Area                                  Level   Factor      10. Cut Slope Support
                                                              Area                             Level   Factor
           Volcanic Extrusive Rock       H       1.1
                                                                     Concrete Wall               L      0.5
  x        Sedimentary Rock              M        1
                                                                     Crib Wall                  M       0.9
           Low Grade Metamorphic         M        1
           Rock                                                      Gabion Wall                M        1
           High Grade Metamorphic        L       0.9                 Rock Wall                  H       1.5
           Rock                                                      Timber Wall                H        2
                                                              x
           Volcanic Intrusive Rock       M        1
                                                                     Unsupported                H        2
4. Soils
  Area                                  Level   Factor      11. Concentration of Surface Water
                                                              Area                             Level   Factor
           Rock at Surface               VL      0.1
                                                                     Ridge                      L       0.7
           Residual Soil < 1m deep       L       0.5
                                                                     Crest                      M       0.8
           Residual Soil 1 - 3m deep     M       0.9
                                                              x      Upper Slope                M       0.9
  x        Residual Soil > 3m deep       H       1.5
                                                                     Mid Slope                  H       1.2
           Colluvial Soil < 1m deep      H       1.5
                                                                     Lower Slope                H       1.5
           Colluvial Soil 1 - 3m deep    VH       2
           Colluvial Soil > 3m deep      VH       4
                                                            12. Wastewater Disposal
                                                              Area                             Level   Factor
5. Fill Height
  Area                                  Level   Factor        x      Fully Sewered              M        1
           None                          L       0.9                 Onsite Disposal -          M       1.2
                                                                     Surface
  x        Less than 1.0 m               M       1.1
                                                                     Onsite Disposal - Soak     H       1.5
           Between 1.0 m and 3.0 m       M       1.3                 Pit /Trench
           Between 3.0 m and 6.0 m       H       1.7
           Greater than 6.0 m            VH      2.5        13. Stormwater Disposal
                                                              Area                             Level   Factor
6. Evidence of Groundwater                                    x      All Stormwater Piped to     L      0.7
  Area                                  Level   Factor               Street Drainage
                                                                     Rainwater Tank with        M        1
  x        None Apparent                  L      0.7
                                                                     Overflows
           Minor Moistness               M       0.9                 Stormwater Discharge       H       1.5
           Generally Wet                 H       1.5                 on Site
           Subsurface Springs            VH       3
                                                            14. Evidence of Instability
                                                              Area                             Level   Factor
7. Cut Height
  Area                                  Level   Factor        x      No sign of instability     L       0.8
           None (Go to section 11)       L       0.9                 Soil Creep                 H       1.2
           Less than 1.0 m               M       1.1                 Minor Irregularity         VH       2
           Between 1.0 m and 3.0 m       M       1.3                 Major Irregularity         VH       5
  x
           Between 3.0 m and 6.0 m       H       1.7                 Active Instability         VH      10
           Greater than 6.0 m            VH      2.5