Slope Stability AG-220616-RPT-G-01_[Rev A]

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, the
Plumbing and Drainage Act, The Environmental Protection Act & Local Authority requirements.
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                                                                  27-30%
 Slope Stability                                         To be address in slope stability report
 Vegetation                                                 Grassed, scattered large gums
 Fill                                                                     Nil
 Flooding                                                                 Nil
 Watercourses                                                 Gully downhill well away
 Site exposure                                                        Sun & wind
 Salinity                                                                 Nil
 Surface condition                                        Nil cracks, seepage or compaction
 Boulders & Rock outcrops                                                 Nil
 Will water from uphill traverse the area                   Yes, diversion drain to prevent
 Water table                                                              Nil

Soil Category (AS1547-2012 Table M1)

 Borehole                        0-0.3m                 0.3-0.9m
 BH3-BH5                          Cat 4                   Cat 5
                              Clay Loams               Light Clays
                            Weakly Structured      Moderately Structured
                              0.12-0.5m/d             0.06-0.12m/d

Recommended Design Irrigation Rate

 Test Result                                                             0.09
 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 Heavy Droplet Surface Irrigation