REFERENCED DOCUMENT Assessment of Existing Wastewater Infrastructure - MCU13/0064

             Table 3: Minimum Required Irrigation Area

                                                      Irrigation Area as Determined by Table M1
                        AS1547:2000 Soil Category
                                                      of AS 1547
                           Soil Category 2 – Sand                      552m2


             From Table M1 of AS1547:2012 assuming a hydraulic loading of 2,760 litres per
             day and a Category 2 soil (DIR of 5mm/day), a minimum application area of
             552m2 is required.


             Suitability of Existing Wastewater Treatment System and Land Application Area

             Based on information supplied by the service agent (H2Gold) the existing
             Novaclear AWTS has the capacity to handle a peak hydraulic loading of
             2,700L/day. However, based on the relevant guidelines a peak hydraulic loading
             of 2,760L/day (14EP) was calculated. Therefore, through the modification of the
             Novaclear AWTS pump timing, the peak design capacity of the system is to be
             expanded to handling 2,760L/day (14EP).

             The accommodation facility is currently serviced by a land application area of
             540m2, based on a daily irrigation rate of 2,700L (peak load). However, based on
             the calculated hydraulic loading of 2,760L/day a minimum land application area
             of 552m2 is required. Therefore, it is proposed to limit the daily irrigation rate to
             2,700L through the modification of the irrigation pump system. The additional
             60L/day generated during peak occupancy will be retained within the 10,000L
             wet weather storage tank for irrigation during off peak times.

             The nature of the facility would normally result in fluctuating wastewater flows,
             as it is anticipated that it will not operate at 100% occupancy at all times. Given
             that the facility has sufficient capacity to treat, manage, irrigate and if necessary
             retain effluent at times when required, the impact can be appropriately
             accommodated.

             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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