20230025_RECOR_MCU Engineers Letter_20.12.24

Technology Information
     Applicant’s
     Verified                 Parameter
     Performance              Total suspended solids            45%
     Claims (ER)              Total phosphorus                  47%
                              Total nitrogen                    25%
                              Total petroleum                   Not claimed
                              hydrocarbons
                              Gross pollutants                  100 %

                             IEP’s comments: Nil.
                             IEP’s recommendations: All performance claims are considered compliant up to the
                             treatment flow rate for the applicable device. Verified flow rates are included in the table
                             below:

                              Size of Stormsack (Pit             TFR for MUSIC modelling – high
                              dimensions) (mm)                   flow bypass in litres per second
                              450 x 450                          10
                              600 x 600                          25
                              600 x 900                          32
                              900 x 900                          39
                              1200 x 900                         50
                              1200 x 1200                        65




     Test Stormwater         21 compliant stormwater events. Water chemistry was compliant with Table 1 in
     Runoff                  SQIDEP v1.3. Minimum number of aliquots collected, and samples were
                             representative.



     Test Catchment      -   The field testing for the ATLAN Stormsack (200) was carried out at Griffith University,
                             Carpark H, Parkland Campus, Griffith Way, Southport, QLD, 4215.
                         -   The catchment area draining to the device was reported to be 1,181 m2 directly connected
                             to the Stormsack. The catchment was reported to be 66% impervious with the remainder
                             including a eucalyptus forested area which drains to the Stormsack.




     Maintenance             The Stormsack should be cleaned/maintained when accumulated pollutants reach
     Performed during        the trigger level of 150mm depth in the bag, or 50% capacity by volume.
     monitoring
                             The monitored Stormsack was maintained twice during the SQIDEP monitoring
                             program due to construction loads received from earthworks undertaken in the
                             upstream catchment. Regular inspection of the Stormsack is recommended, as per
                             the manufacturer’s O&M manual.