20230025_RECOR_MCU Engineers Letter_20.12.24

                                                                                       Verification Certificate – SQIDEP VC
                                                                                       Reference Number: SA-2019/009/VC

  Technology Information
   Applicant’s
   Verified              Total Suspended Solids (TSS) 86 %
   Performance           Total Phosphorus (TP)        65 %
   Claims                Total Nitrogen (TN)          50 %
                         Total Petroleum Hydrocarbons 0 %
                         Gross Pollutants             99 %
                         Others, please detail:

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   Maintenance
   performed                • The inlet chamber and StormSack was maintained once annually during monitoring;
   during                   • No maintenance was performed on the planted media;
   monitoring               • The SPELBasin® Technical Guideline recommends maintenance of the inlet chamber and
                                Stormsack quarterly;



   Verified                 • The submitted, calibrated MUSIC model provides a method of modelling the technology
   method to                    with 1 Generic node as per the image below;
   model in
   MUSIC



                            •
                               The input criteria for the node is;
                                    o Generic node
                              High Flow Bypass                                 0.01 m3/s
                              Gross Pollutants                Input = 150 mg/L         Output = 1.5 mg/L
                            Total Suspended Solids           Input = 1000 mg/L         Output = 140 mg/L
                              Total Phosphorus                 Input = 10 mg/L         Output = 3.5 mg/L
                               Total Nitrogen                  Input = 50 mg/L          Output = 25 mg/L



   Conditions            The limitations of the acceptance of these claims include;
                            • The results are for a road-based catchment. The results lie within acceptable inflow
                                limits for this type of catchment and based on the analysis are found to be acceptable.
                                This does not necessarily relate to other catchment types, though it noted that hard
                                stand catchments will behave similarly. Cleaner, roof catchments
                                may not achieve the same pollutant reduction targets;
                            • The results are for a hydraulic loading rate up to 250m/year. Should the hydraulic load
                                rate exceed this, the results and life expectancy of the media would be expected to
                                decline in line with excessive loading on the device;
                            • The results are reliant on the maintenance of the device being consistent with the
                                manufacturers guidelines and those that are contained in the report. Most importantly
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