App B - Effluent Information

3.3 Soil Classification



                                                    Soil Classification - Adopted
        Borehole Nos                                                                                  1&2
        Soil Category Adopted                                                                           5
        Indicative Drainage                                                                       Poorly Drained
        Structure                                                                                    Strongly
        Texture                                                                                    Light Clay
        Indicative Permeability P (m/d) as Ksat*                                                    0.12 - 0.5
        Recommended DLR (AS/NZS 1547 / 2012)                                                           10




      4.0 Recommendations:
      4.1 Treatment Facility:
     The on-site treatment facility to service the new studio is to be an Advanced Enviro-Septic System (AES). This
     system has a Chief Executive Approval # 15/2019 for Advanced Secondary Effluent. The Person Equivalent (PE) for
     this system is to be no less than 3.

     A new min 3000L all waste septic tank is to be installed to service the detached dwelling.

     All wastewater from the detached dwelling is to be directed to the septic tank then to the AES bed.

     The Land Application Area is to be an Advanced Enviro-Septic Infiltration Bed of 36m2.

     All work is to be done by appropriately trained and licenced plumbers/installers.




      5.0 Design Calculation - Detached Dwelling
      The serviceable life of the Land Application Area will be compromised if the design flow is exceeded. Any
      proposed changes to the position of the Land Application Area, System Type or House Design will require a
      reassessment of this site. For our calculations we have assessed the design flow as follows:

                                                    Design Calculation
         DLR (mm/d) (secondary quality effluent)                                                      10
         Hydraulic load (lt/day/person) Tank Water / 2 bedrooms                                       120
         Design Flow Q (lt/day)   PE: 3                                                               360
         Design sizing calculation                                                           L = Q /(DLRxW)
                                                                                                  = (360 / 10)
         Disposal area A+B (square metres) AS/NZS1547:2012                                           36m2
         Nominated Configuration (metres) AES System Design Calculations                 = 9m x 4m (L xW) 36m2
         A new min 3000L septic tank is required.                                            AES System PE 3




                                                                                  C Copyright Lance Picton 2023 design & content. 3/11