Part RFI - Effluent Disposal Report

     are indicative of the soil profile over the site any discrepancy between the profile detailed in the
     borelogs and that observed during construction shall be referred to Global Testing for
     immediate attention.

4.   INVESTIGATION DETAILS

     The investigation carried out at the site included machine augered boreholes up to 2000mm
     depth and a series of three permeability test pits located as shown on the attached site report.
     All testing carried out was in accordance with Australian Standard 1547 - 2012 “On-site
     domestic-wastewater management”.


5.   TEST RESULTS AND CONCLUSIONS (TABLE A1)
      Test No.  Soil           Slope Setback   Recommended                                  Beavers
                Permeability   (m/m) Distance Design Irrigation                             Gardner
                (based on test       (m)       Rate (mm/Day)                                Setback
                results)Ksat                   As per AS/NZS                                Distance
                                                 1547-2012
      PT 1           0.09
      PT 2                   0.08
      PT 3                   0.08
      Average                0.08            .0            10*               3                  1m

     *Minimum setback distance from a watercourse (when an Advanced Secondary ASTP is
      recommended) required by Noosa Council Policy.

     Determination of Soil Category (Table 5.1 of AS/NZS 1547:2012)
       Soil Category         Soil Texture         Structure          Indicative          Indicative
             BH5                                                    Permeability       Drainage class
                                                                    (ksat)(m/day)
              5               Light Clays          Moderately        0.06 to 0.12      Poorly Drained
         (00-300mm)                                Structured
              6              Medium to             Moderately           < 0.06           Very Poorly
        (300-2000mm)         Heavy Clays           Structured                             Drained

     The Design Irrigation Rate of 3mm/day was adopted from the above results in Table A1.

     Noosa Council’s policy suggests that the use of a primary treated effluent disposal system
     will be satisfactory provided;
        # Sufficient permeable surface soil overlying rock is present over the disposal area, not
          less than 1.2metres depth.
        # A suitable soil category material (as per AS1547-2012) is encountered.
        # A Minimum set-back distance of 50m is obtained.
        # Permeability rates are within the required parameters.
     Not all the above requirements have been met, therefore it is concluded that the use of a
     primary treated effluent disposal system is not acceptable.




                                        Report 20/0668 edr page2