slope stability report · MCU22/0195

INTRODUCTION

SCG Consulting Engineers have been commissioned to provide a Slope Stability Assessment for the above
allotment. The assessment considers only 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 Chris Clout Design in plans Project Name: Clout Villa sheets C0.0, C1.0
thru C7.0 dated 9 November 2022.


SITE DESCRIPTION

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

    -   The site is located in an area identified as ‘Sand Dune Problem Area’ on the Noosa Shire Council’s
        Landslip Hazard Map.

    -   Reference to the Australian Geological Map 1:100000 Gympie Special confirms the site is located within
        the Quaternary Sandbed.

    -   Level contours provided on the proposed building plans indicate an average fall across the site of 15%.
        Maximum grades in the order of 60%(30º) occur at the southern boundary of the site.

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. (32303(S)) dated 13 December 2022
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 18-20% 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.

                                 Stormwater flows from upslope of the allotment will be intersected and
                                 captured by the road reserve.

Earthworks               :       There is no existing earthworks apparent.

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
Soil Movements       :           None apparent.


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.