1890 Effluent Disposal Review · MCU20/0022

      Main Residence:-

      Represented by boreholes 1-5. Minor filling identified with a raised platform at BH 1/2
      while BH 3 appears to represent a remnant fire pit. The BH 4/5 represent the
      undisturbed divergent flank. Silty/ clayey SAND topsoils transition to (CL/CH) sandy/
      silty CLAYS. No rock within 2.3 metres of the surface. The clays are (CH) at depths
      ranging 0.6/1.0 metres. Uncontrolled fill depths up to 0.7metres. The residual clays are
      of stiff consistencies.

      Detached Cottages:-

      Represented by boreholes 6/7. A silty / clayey / gravelly SAND upper soil profiles
      extended to 0.35/ 0.65 metres depth. Clays (CH) below and extend beyond 2.2 metres.
      The upper sandy profile was medium dense/ dense and with stiff clays. Additional
      boreholes 8 -10 revealed moderate fill depths and with some rock cobbles insitu. The
      land surface is irregular and suggests an extended time-line of filling. Filling of 0.4/ 1.0
      metres with the fill a (CL/CH) sandy CLAY. Dynamic cone penetrometer test values
      enhanced by gravel insitu the fill. The remnant silty topsoils have not been stripped prior
      to filling. The profile transitions to (CH) clays below 1.05 - 1.3 metres depth. The filling
      is uncontrolled. Moderate consistency subsoils.

2.7   Groundwater
      Not encountered but seasonally likely




3     Effluent Disposal Site Assessment
3.1   Site assessment procedures were in accordance with AS1547 – 2012 (D3.1.2)
      (modified procedure) were applied to the revealed soil profile.

3.2   We would conclude the review areas are represented by the soil categories:

                               4 – clay loam to 5 – light clay

      We propose a conservative design soil category of 5 – light clay

3.3   Due to the proximity of the Q100 flood contours, soil profile and structure, we propose
      two separate effluent systems. One system for the residence and separate system for
      the three detached cottages. The systems will produce ‘modified’ advanced secondary
      effluent quality and combine this with fixed surface irrigation for land application.



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