Environmental Report (onsite effluent disposal) · MCU13/0064

             On-Site Wastewater Land Application Area

             Effluent irrigation currently occurs via subsurface dripper lines within the existing
             raised garden beds, totalling 540m2.

             Based on the estimated hydraulic loading of 2,700L/day, the required effluent
             irrigation area can be determined using Design Irrigation Rate (DIR) calculation
             as set out in Table M1 of AS1547:2012.

             Table 2: Minimum Required Irrigation Area

                                                      Irrigation Area as Determined by Table M1
                        AS1547:2000 Soil Category
                                                      of AS 1547
                           Soil Category 2 – Sand                      540m2


             From Table M1 of AS1547:2012 assuming a hydraulic loading of 2,700 litres per
             day and a Category 2 soil (DIR of 5mm/day), a minimum application area of
             540m2 is required. It is noted that there is sufficient space available to
             accommodate a 100% reserve area.

             It appears that the estimated hydraulic loading from the proposed change will not
             require a change in size of the existing effluent disposal system.


             Suitability of Existing Wastewater Treatment System and Land Application Area

             Based on the calculated peak hydraulic loading of 2,700L/day (14EP) and the
             minimum required land application area of 540m2, no change to the existing
             infrastructure in relation to sizing is considered necessary. The existing
             Novaclear AWTS and subsurface land application area appear to be in sound
             operating condition to accommodate the proposal.

             Provided the on-site sewerage facility is maintained in accordance with the
             recommendations provided in the Site and Soil Evaluation Report (ref no. 2771-
             02) and operation and maintenance manual, there will be minimal risk of impact
             to the site and surrounding areas. The system must be operated and maintained in
             compliance with the manufacturer’s requirements to ensure this risk is
             appropriately managed.




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