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

PROJECT NO. 23/8894                                                         24th JULY 2023


4.0    HYDRAULIC FLOWS AND RECOMMENDED DISPOSAL SYSTEMS
                                                                                 (Cont.):
       Calculations of wastewater loadings have resulted in a minimum area of 240m2 of
       Disposal Area required for the residence proposed. An indicative area has been
       shown on the Site Plan.
       Setback distances are calculated to prevent any viruses present within sewage
       effluent travelling through the soil, contaminating areas that may come in contact
       with human habitation and into streams.
       The “On-Site Sewerage Code” by the Department of Natural Resources recommends
       a minimum setback to any watercourse or dam for the location of Secondary Treated
       Wastewater Application Areas are to be a minimum of 30 metres.
       All surface water and seepage water up slope of the disposal area shall be diverted
       around the area. All disposal areas shall be setback a minimum 4.0 metres from
       boundaries on the downhill side, and 2.0 metres from all other boundaries. Buildings
       shall be a minimum of 15.0 metres from the wastewater application area.
       Grass cover and vegetation should be maintained around the area as well as good
       sunlight exposure to maximise evapotranspiration.


       To ensure optimum performance of disposal areas, adequate maintenance of systems
       is essential.   They should be installed by approved and licensed plumbers and
       maintained at regular scheduled intervals.


5.0    SUMMARY:               The Treatment System and Land Application Area is considered
       suitable for proposed domestic On-Site Effluent Disposal provided the setback
       guidelines set out in this report are followed.
       Should the client have any queries in relation to the information contained in this
       report, this office should be contacted.




       K.N. CROCKER                   (M.I.E. AUST. R.P.E.Q. NO. 638)




8894-193 SANKEYS RD-FEDERAL               Page 4 of 13                        24/07/2023