Appendix D - On-site domestic wastewater evaluation report · MCU25/0022

PROJECT NO. 23/8894                                                              24th JULY 2023


1.0    INTRODUCTION: The Site Inspection and Field Testing to determine soil types
       and characteristics were carried out by Civil Quality Assurance Pty.Ltd.
       This report refers to their findings and results to determine a suitable method and size
       of domestic wastewater application area from a proposed 4-bedroom residential
       dwelling.


2.0    SITE: The allotment is situated off the western side of Sankeys Road, FEDERAL.
       It is a large heavily timbered allotment described as Lot.6 RP216727 with an area of
       6.041 hectares. Refer locality on front cover of this report. A wastewater application
       area was selected on the northern western side of the proposed building site.
       The area’s natural land surface falls to the south west at about 18%. The area is
       heavily treed bushland and well grassed.
       Testing was carried out over the proposed wastewater disposal area to determine soil
       types and characteristics of the existing soils for the purpose of on-site domestic
       wastewater disposal.    Soil Classifications and Descriptions were carried out in
       accordance with A.S. 1547:2012 “On-Site Domestic Wastewater Management” and
       the “On-Site Sewerage Code” published by The Department of Natural Resources.
       Test Locations are shown on the attached Site Plan.


3.0    SUB-SURFACE INVESTIGATIONS:                     Boreholes carried out revealed silty clay
       surface soils of medium to high plasticity overlaying shallow highly weathered
       shaley siltstone. Soils classified in accordance with Table 5.1 of A.S. 1547:2012
       were given a general Soil Category 5 (Massive Structure). Borelogs showing the soil
       profile are attached.
       Percolation Testing measures the soil’s water absorption capabilities. The testing
       was carried out in accordance with A.S. 1547:2012, Appendix G, using 100mm
       diameter test holes to a depth of 450mm. The tests were carried out in several
       positions on the site and the results are shown on the attached Desktop Analysis.




8894-193 SANKEYS RD-FEDERAL             Page 2 of 13                              24/07/2023