Soils report for footings and effluent northern cabin

                                                                            Geotechnical Soils
                                                                                    'Digging up all the Details'
                                                                                                ABN: 15 895 975 485


                                       Soil Investigation Summary
Client              Eco Cottages                                                        Date      2/11/2020
Site Address Lot 4, RP 852013, #53 Martins Road, Cooroy 4563                            Job No SER 2184

Purpose                  Proposed Secondary           Test Method: Vehicle Mounted Rig
                         Residence
Wind Category:           N3                           Attachments: Site Plan/ Subsoil Profiles/ Photographs
(Informative AS 4055)

Reference Documents:

                        - Architectural Plans by Sparks Architects, job no: 165, plan no:SD3.1/3.2

Site Details:
Description                The allotment is 15.5797ha in area and regionally located over an undulating
                           plateau area. Locally the proposed secondary residence is situated on the
                           crown of a 'saddled' spur-line. Adjoining the building area are horse yards and
                           stables. The review area is fenced to the north and east. Access to the review
                           area is by an existing gravel track. The allotment is located in Noosa Shire. No
                           visual evidence of slope instability. It is understood the proposed structure is to
                           be supported by pad footings with a suspended timber floor. On-site effluent
                           disposal required with tank water supply. Photographs attached.

Topography                 The allotment is upon an undulating elevated plateau with a series of
                           meandering and elongated spur-lines. Locally the review area represents the
                           crown and near flank of a 'saddled' spur-line. The crown has a minimal fall
                           and the eastern flank grades at 1: 9 (V:H) and 1:7. Waxing contours.

Vegetation                 Short sparse pasture grasses with a very large gum tree to the south of the
                           proposed building area. The fence line (eastern) boundary has numerous
                           large trees established.

Drainage                   The spur-line has divergent contours and is well drained. Runoff disperses
                           primarily to the west and east and minor fall to the north.

Geology                    Described as the Kin Kin Beds that is typically represented by phyllite, arenite
                           and argillite rock types.

Soil Profile               To establish soil profiles within the proposed residential and effluent application
                           areas, four boreholes (BH) were advanced by a small vehicle mounted drilling
                           rig. In addition, dynamic cone penetrometer testing (DCP) was carried out
                           adjacent BH 1/2. Test locations shown on PLATE 1 and subsoil profiles / test
                           values in APPENDIX A. Homogenous soil profiles with friable (CL) and localised
                           (CH) sandy/ silty CLAYS. No consistent rock within 2.0 metres of the surface,
                           however, the clays below 1.5 metres in BH 2 had some phyllite rock. The soil
                           profile was found to have stiff and very stiff/ hard clay consistency values.

Discussion               Residential founding should consider-:
/ Remarks
                            - topographic setting (saddle spur-line)
                            - friable light clays
                            - stiff/ very stiff clay consistencies
                            - adjacent large gum tree
                            - reference to AS 2870, Appendix H 'Guide to Design of Footings for Trees'
                            - on-site effluent disposal required

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