Scg 27099(Sl) · MCU17/0512

INTRODUCTION

SCG Consulting Engineers have been commissioned to provide a Slope Stability Assessment for the above
allotment. The assessment considers the existing state of the allotment and any possible effects that the
proposed works will have on this site.

The proposed works are detailed by Teeland Architects in plans project 1504 revision SD03 and consists of
proposed two storey dwelling.


SITE DESCRIPTION

A desk top study of the site confirms the following:-

   -   The site is located in an area identified as ‘Low Landslip Hazard’ on the Noosa Council’s Landslip Hazard
       Map 1.3 (5 November 2010).

   -   Reference to the Australian Geological Map 1:100000 Gympie Special confirms the site is located within
       the Coastal Sand Dunes of the late Quarternary period, consisting of beach sand, beach ridges, calcareous
       and siliceous or cemented beach rock.

   -   Reference to Sunmap 1:25000 topographic maps confirm the site is located on the middle of the Sunshine
       Beach Primary Sand Dune formation.

   -   Level contours provided on the proposed building plans indicate an average fall across the site of 8%.

Field work has been undertaken which included explorative boreholes by SCG Consulting Engineers together
with a walkover of the site by SCG Consulting Engineers.

The borehole logs contained in SCG Consulting Engineers report, (No. 27099(S)) confirms the soil profile to
consist of the following –

                            :   LOOSE SILTY SANDS INCREASING IN DENSITY WITH DEPTH

Our walkover confirmed the following characteristics-

Site Slope                  :   A visual assessment of the surface grades within the allotment using a hand held
                                inclometer suggests grades in the order of 8% exist across the proposed
                                construction site.

Vegetations                 :   Vegetation consists of grasses and scattered trees.

Slope Shape/Location :          The surface profile across the allotments slope faces are generally LINEAR
                                PLANAR.

Drainage                    :   The surface drainage is good, sub-surface drainage is good.         There was no
                                indication of ground water seepage or rising water pressure.

Earthworks                  :   A number of excavated platforms exist on the site.

Adjacent Structures         :   Adjacent structures on the neighbouring properties appear to be a mix of slab on
                                ground and suspended timber framed floors.

Evidence of previous        :   None apparent.
Soil Movements


LANDSLIP MECHANISMS

Landslip is generally defined as the movement of a mass of rock or soil down a slope.

It is generally considered to occur when the strength of the soil or rock mass to support itself is exceeded causing
movement to occur within the mass.


 SCG Consulting Engineers                                   2                                   SCG Ref: 27099(SL)