14169-001-Rev0 17 Webb Rd -Revised Draft · 132002.220527.1

                             17 WEBB ROAD, SUNSHINE BEACH
                             PROPOSED RESIDENCE

5.3        Laboratory Test Results
Particle size distribution (PSD) analysis was carried out on a disturbed sample recovered from 0.15 m to
0.6 m BGL in borehole BH1, indicating that the sand is fine to medium grained with a trace (3%) of silt. The
PSD indicates that the sand has a D10 value of about 0.16 mm, that being the grain size that 10% of the sand
particles are smaller than.

The PSD laboratory test certificate is attached in Appendix B.



6.0      SLOPE STABILITY ASSESSMENT
6.1      Existing Conditions
NSC natural hazard overlay mapping indicates that the site may be susceptible to landslide (pink shading, as
shown in Text Figure 9).




                                          T
                                       AF
                                                                   SITE
                               R


Text Figure 9: Extract from NSC landslide hazard overlay map
                       D



It should be noted that the NSC map is a broad-scale indication of the potential landslide susceptibility only
and is superseded by site specific investigation and analysis works. As detailed in Section 4, the site does
not exhibit any indicators of slope instability. No landslide scarps or areas of erosion were observed. The
existing and surrounding structures showed no signs of previous landslide activity. Medium dense grading
to dense and very dense sands were encountered in the boreholes at relatively shallow depth, and no
groundwater seepage was discovered.




26 February 2015
Report No. 14169-001-Rev0                              7