Appendix G - Geotechnical Report

Introduction

The purpose of this report is to evaluate and design a suitable on-site treatment system and disposal
area in accordance with AS 1547 – 2012, the Queensland Plumbing and Wastewater Code and the
Plumbing and Drainage Act. The report relates exclusively to the above site and the proposed and or
existing buildings shown on the plan only. All measurements and levels shown are as accurate as
possible with the information provided these are to be used for locating the onsite effluent disposal
system only.


Site Description

 Weather Conditions                                                      Fine
 Slope                                                                  5-15%
 Slope Stability                                                          N/a
 Vegetation                                                        Heavily Grassed
 Fill                                                                     Nil
 Flooding                                                                 Nil
 Watercourses                                                             Nil
 Site exposure                                                        Sun & wind
 Salinity                                                                 Nil
 Surface condition                                        Nil cracks, seepage or compaction
 Boulders & Rock outcrops                                                 Nil
 Will water from uphill traverse the area                                 No
 Water table                                                              Nil

Soil Category (AS1547-2012 Table M1)

 Borehole                        0-0.2m                0.2m-0.6m
 BH3-BH5                          Cat 4                   Cat 5
                              Clay Loams               Light Clays
                            Weakly Structured      Moderately Structured
                              0.12-0.5m/d              0.06-12m/d

Recommended Design Irrigation Rate

 Test Result                                                             0.10
 Recommended Design Irrigation Rate                                    3mm/day
 Adopted Rate                                                         3/mm/day

Calculations

 Bedrooms                                                              4
 Persons                                                               6
 DIR (mm/day)                                                          3
 Litres per person per day (Tank supply)                              120
 Calculations                                                   6x120=720 /3= 240
 Disposal Area Required                                   240m2 Covered surface pressure
                                                             compensating irrigation