Development Application Part 2 of 2 - Plans 7 Banksia Avenue Noosa Heads · OPW10/2120

                                                  2
                                                                                 Job No. DE10I061




2.0     METHODOLOGY

The DEQ Consulting Engineers site investigation report (Ref No 09.1029, dated 8t" March,
2010) was studied to gain an understanding of the subsurface conditions and general site
conditions. Two (2) boreholes were excavated by hand auger by representatives of our Morrison
Geotechnic Maroochydore office and logged in accordance with AS1726 to confirm the
subsurface conditions at the site. The boreholes were excavated using a 55mm diameter hand
auger to a depth of 2m below the ground surface. Dynamic Cone Penetration (DCP) tests were
conducted adjacent to each borehole.

Each borehole location was marked onsite using a hand held GPS and using UTM GDA
coordinates with a general accuracy of +3m to 5m.

M. Rubinic of our Maroochydore office also conducted a walkover survey to check for signs of
existing or potential instability. This involved mapping and measuring observed features of
significance to slope stability such as soil type, slope gradients and direction, erosion features,
surface and subsurface drainage, vegetation density and the presence of irregular surface
features such as slips, slumps, hummocks, back scarps, scree debris fans or any associated
features. Ground surface slopes were measured using a hand-held inclinometer.

The results of the walkover survey, the subsurface conditions encountered in the boreholes and
the surface slope angles were used to assess the post development risk level for this site.

Site photos are presented in Appendix A. A site plan showing the approximate positions of the
boreholes is given in Appendix B. The borehole logs are presented in Appendix C. A copy of the
site investigation report by DEQ Consulting Engineers Pty Ltd is attached as Appendix D. The
Guidelines for Hillside Construction are contained in Appendix E.


3.0     SITE DESCRIPTION

The site is positioned on a gentle hillside which has been cleared of most of the original
vegetation, with juvenile remnant shrub and grass vegetation covering the majority of the site.
Mature trees align the front and rear boundaries. The ground surface slopes downwards to the
west and rear boundary at angles ranging between 14 and 18°.

No major existing erosion, backscarp or historical landslip features were observed during the
walkover survey.

Residential buildings are positioned immediately to the north and south of the site.


4.0     SUBSURFACE CONDITIONS

Based on the observed soils retrieved from the hand auger boreholes, the site is underlain by
moist, silty sand and sand soils, which are generally very loose or loose to a depth of 0.3m to
0.5m, becoming medium dense below this depth and extending to a depth in excess of 2m.
These observed subsurface conditions generally agree with those described in the DEQ
Consulting Engineers report.

The Morrison Geotechnic borehole log sheets are provided in Appendix C. The DEQ Consulting
Engineers report, including their borehole record sheets, is presented in Appendix D.




Ref: 14858B DEQ Consulting Engineers Pty Ltd                         MORRISON GEO TECHNIC