220239 - 44 Williams Road, KIN KIN - SSE - TE222036 - 44 Williams Road, Kin Kin QLD 4571 (1) (1)

3     Primary Dwelling
3.1     Soil Investigation
A geotechnical investigation was undertaken by Geotechnical Soils on 28 October 2021. The soil profile
and design characteristics for the primary dwelling effluent disposal area are presented in Table 2.

Table 2: Soil Type
      depth                                BH4                       depth                       BH5
                           Silty clay (CL), low plasticity                          Silty clay (CL), low plasticity
       300                                                            250
                                Cat 4 – moderately                                       Cat 4 – moderately
                        Silty clay (CL), medium plasticity                       Silty clay (CL), medium plasticity
       750                                                            750
                                  Cat 5 – strongly                                         Cat 5 – strongly
                           Silty clay (CL), low plasticity                         Sandy clay (CL), low plasticity
      1150                                                           1650
                                Cat 4 – moderately                                       Cat 4 - moderately
                                  Clayey sand (SC)
      1500                                                           2250                       XWR
                                   Cat 3 - massive
                                                  Design Characteristics
 Texture                                          Clay Loam / Light Clay
 Category                                         5
 Indicative Permeability (Ksat)                   0.12 – 0.5 m/day
 Adopted Design Loading Rate (DLR)                10 mm/day


3.2     Wastewater System
Table 3 below presents the features of the AES system for the primary dwelling.

Table 3: Design Features
                                Feature                       Details
                                Septic tank capacity          3000 L (min)
                                Treatment plant               Advanced Enviro Septic (AES)
    Treatment System
                                Treatment plant approval      15/2019
                                Treatment level               Advanced secondary
                                Water supply                  Rain water
                                Volume Allowance              120 L/person/day
      Design Volume             Number of bedrooms            3
                                Design population             5
                                Total Design Volume (Q)       600 L/day
                                Category                      5
    Soil Characteristics
                                Design Loading Rate (DLR)     10 mm/day
                                                              Width = 2.33m
                                                              Length = Q / (DLR x Width)
                                Required disposal area               = 600 / (10 x 2.33)
      Disposal Area                                                  = 25.8m
                                                              Area   = 60 m2
                                Install as                    2 [email protected] x 2.33m each




Site and Soil Evaluation                                                           44 Williams Road, Kin Kin QLD 4571
Taylor Environmental (Australia) Pty Ltd                                                                  Page 4 of 19