Reference Documents - MCU24 0141 & OPW24 0184 [As Published]

              4. Stormwater Quality Management
              4.1.       Water Quality Objectives
              The proposed stormwater management plan demonstrates the development will comply with NSC policies and
              the SPP (2017) stormwater quality requirements. The report will demonstrate how the relevant stormwater
              pollutant reduction identified in the objectives are to be met.
              Stormwater runoff generated from the site must achieve the required reduction objectives (seen in table 1);
              this is to be demonstrated utilising appropriate modelling software.
              Table 1 - Pollutant Reduction Targets for South East Queensland

                Pollutant                                   Reduction Objective (per annual load of pollutants)

                Total Suspended Solids (TSS)                80%
                Total Phosphorus (TP)                       60%
                Total Nitrogen (TN)                         45%
                Gross Pollutants (GP)                       90%
              The proposed industrial development is located upstream of the Noosa River, which is located approximately
              2.0km to the north of the site. The site ultimately discharges to the Noosa River. Table 2 outlines the specific
              performance criteria required within receiving waters for the Noosa River, as identified in the Environmental
              Values and Water Quality Objectives – Basin No. 140 (Part), including Kin Kin Creek, Teewah coastal creeks,
              Lakes Cooroibah, Cootharaba, Doonella and Weyba (Environmental Protection Water Policy, 2010). The
              proposed development identified on Plan WQ1401 of the Environmental Protection (Water) Policy (2009)
              Southeast Queensland Map Series as being Weyba fresh waters.
              Table 2 - Noosa River Environmental Values and Water Quality Objectives (as per WQO's for coastal
              freshwaters)

                Pollutant                                                       Water Quality Objectives

                Turbidity                                                       <10 NTU
                Suspended Solids (SS)                                           <6 mg/L
                Chlorophyll a                                                   <5 µg/L
                Total Nitrogen (TN)                                             <500 µg/L
                Oxidised Nitrogen                                               <60 µg/L
                Ammonia Nitrogen                                                <20 µg/L
                Inorganic Nitrogen                                              <420 µg/L
                Total Phosphorus                                                <50 µg/L
                Filterable Reactive Phosphorus                                  <20 µg/L
                Dissolved Oxygen (% saturation)                                 85 – 110 % saturation
                pH                                                              6.5 - 8.0




240127 – Stormwater Management Plan               6 of 10