RFI - Attachment C - Slope Stability Assessment and Geotechnical report · MCU20/0026

                                     TABLE OF CONTENTS
1.0     INTRODUCTION .............................................................................................. 1
 1.1      General .................................................................................................................. 1
 1.2      Reason for this Report ......................................................................................... 1
 1.3      Scope of Report .................................................................................................... 1
 1.4      Controls and Procedures ..................................................................................... 1
 1.5      Proposed Development ........................................................................................ 2
 1.6      Provided Information ............................................................................................ 2
2.0     ASSESSMENT METHODOLOGY ................................................................... 3
 2.1      Method ................................................................................................................... 3
 2.2      Hazard & Risk Analysis ........................................................................................ 3
3.0     SITE ASSESSMENT AND DATA COLLECTION ............................................ 4
 3.1      Field Investigation ................................................................................................ 4
 3.2      Site Location ......................................................................................................... 4
 3.3      Regional Geology ................................................................................................. 5
 3.4      Published Stability Data ....................................................................................... 5
 3.5      Site Factors ........................................................................................................... 5
 3.6      Geotechnical Model .............................................................................................. 6
      3.6.1     Subsurface Profile ........................................................................................................... 6
      3.6.2     Groundwater and Seepage ............................................................................................. 7
      3.6.3     Laboratory Testing .......................................................................................................... 7
 3.7      Evidence of Possible Instability........................................................................... 7
4.0     RISK ASSESSMENT ....................................................................................... 8
 4.1      General .................................................................................................................. 8
 4.2      Identification of Potential Hazards on Site .......................................................... 8
 4.3      Likelihood Estimation ........................................................................................... 8
      4.3.1     Methods of Assessment .................................................................................................. 8
      4.3.2     Evaluation of Likelihood Rating for Existing Overall Site ................................................ 8
      4.3.3     Hazard A - Natural Shallow Landslide ............................................................................ 9
      4.3.4     Hazard B - Proposed Cuts .............................................................................................. 9
      4.3.5     Hazard C - Scour of Exposed Surfaces .......................................................................... 9
 4.4      Consequence Analysis ....................................................................................... 10
      4.4.1     General .......................................................................................................................... 10
      4.4.2     Site Factors ................................................................................................................... 10
      4.4.3     Consequence to Property ............................................................................................. 10
      4.4.4     Consequence to Persons .............................................................................................. 11
 4.5      Risk Determination and Evaluation - Property.................................................. 11
 4.6      Risk Determination and Evaluation - Persons .................................................. 12
 4.7      Risk Summary ..................................................................................................... 12
5.0     ENGINEERING STABILITY RECOMMENDATIONS..................................... 14
 5.1      General Recommendations with Respect to Construction .............................. 14
 5.2      Stormwater Drainage .......................................................................................... 14
 5.3      Site Specific Recommendations ........................................................................ 15
      5.3.1     General .......................................................................................................................... 15
      5.3.2     Scour ............................................................................................................................. 15
      5.3.3     Retaining Structures ...................................................................................................... 15
      5.3.4     Continued Maintenance ................................................................................................ 15
6.0     ENGINEERING ASSESSMENT ..................................................................... 16
 6.1      Civil Works .......................................................................................................... 16
      6.1.1     Trafficability and Site Preparation ................................................................................. 16
      6.1.2     Earthworks .................................................................................................................... 16
      6.1.3     Batters ........................................................................................................................... 17
 6.2      Building Foundations ......................................................................................... 17
      6.2.1     General .......................................................................................................................... 17
      6.2.2     Site Classification as per AS 2870-2011 ....................................................................... 17
      6.2.3     Further Comments Regarding Foundations .................................................................. 18
      6.2.4     High Level Footings ...................................................................................................... 18