Appendix B- Geotechnical Investigation

Project No. 1
            115-17158
April, 2015
Ref: 1-17158,, 2015-04-08, BR VE
                               ER 1                                                                       Page
                                                                                                          P    | 12
John Jamies son – GEOTECHNIC   CAL INVESTIGATION
                                               N - Proposed Resid
                                                                dence, 38 Park Cres
                                                                                  scent, Sunshine Bea
                                                                                                    ach




    6.3 Stability Risk
                  R    Assess
                            sment

Supplieed contour information
                    i            by the clie
                                           ent (Drawingg H15003N by Hass S    Survey, date
                                                                                         ed May,
2014) inndicates thaat the slope
                               e can be bro oken up into
                                                       o two sectio
                                                                  ons (ie. uppper south an
                                                                                         nd lower
north). The upper section of the slope (ttowards Pa    ark Crescen
                                                                 nt) is approxximately 255O to the
                    he lower se
horizontal, whilst th          ection of the
                                           e slope is ap          y 100.
                                                       pproximately

The existing uppeer section of the slope on the sitee is conside ered to be at equilibrium with
slope angles being
                 g less than the
                             t inferredd friction ang
                                                    gle of very loose sand (28 degrees).

The connstruction of
                   o the reside
                              ence set m ostly above  e ground, will
                                                                 w apply ann additional load on
the slop
       pe, that could be pote entially desstabilising. However, the aim off the proposed pile
foundattions discusssed above e, is to carrry all the building load
                                                                  ds into dennse sands, and not
apply lo
       oad to the lo
                   oose surface sand.

Any deevelopment of this sitee will have to be carriied out with h care to eensure this stability
                   ed. This will apply to b oth the tem
status iss maintaine                                  mporary works during coonstruction, as well
as the p
       permanent building wo orks, and the e long term site mainte
                                                                 enance.

It is reccommendedd that heavy
                             y constructioon materials
                                                     s such as concrete
                                                               c        bloocks or cons
                                                                                      struction
machinery should not be requ uired to travverse or be placed on the slope, aas these ma
                                                                                      ay apply
an unaccceptably la
                  arge surcharge load on nto the slope
                                                     e.

    6.4 Hazard Mittigation & Recommen
                             R      ndations

           6.4.1       Gen
                         neral

In ordeer to preserrve the stabble conditioon of this site,
                                                      s     it is co
                                                                   onsidered eessential th
                                                                                         hat good
hillside engineerinng construc ction practtice be em mployed during the cconstruction of the
propose ed residencce particula
                              arly where l ocated on sloping land. The notees and illus   strations
attacheed in Appenndix ‘D’ of this
                               t    report o
                                           outline som
                                                     me typical hillside
                                                                   h      consstruction gu
                                                                                         uidelines
includinng, earthworks, erosion
                              n control annd drainage e practices for
                                                                   f hillside aareas which
                                                                                         h should
be takeen into account as applicable.

In ord  der to ensure lon     ng-term sttability of the site   e upon ddevelopmen        nt, the
restrictions/precautions includ
                              ded in the fo
                                          ollowing sec
                                                     ctions shoulld also be taaken into ac
                                                                                         ccount.

           6.4.2       Rec
                         commenda
                                ations with Respect to
                                                     o Construc
                                                              ction

Continuued long terrm stability of the site is subject to developm
                                                                 ment of the site taking place in
accordaance with the guidelines of this rreport and relevant Au  ustralian Sttandards annd good
building
       g practices.

Based on the fie   eld observaations, publlished haza  ard mappinng and obsserved sub     bsurface
conditio
       ons, it is co
                   oncluded thaat provided the propos  sed constru
                                                                 uction is un dertaken us  sing our
recomm mendations,, it would not
                              n adverse   ely affect thhe slope sttability condditions at this
                                                                                          t    site.
This conclusion is qualified by
                              y the followiing provisions:-