16-001014-02A (Ultimate SCMMP)

                                         Water Quality Control Pond Inspection & Maintenance Requirements

 Treatment Device / Property              Inspection                                           Inspection Frequency           Corrective Action1
 Surrounds
                                                                                             Quarterly during dry season      Repair or replace damage structure
 Damaged or removed structures            Check for damage that poses a risk to
                                                                                             and every two months
 (e.g. fences & traffic bollards)         public safety or structural integrity
                                                                                             during wet seasons
 Inlet & Outlet
                                          Check for evidence of erosion or
 Erosion                                                                                                                      Remove any blockages or debris within inlet pits or blockages
                                          subsidence/settlement near inlet structure
                                                                                             Quarterly during dry season
 Damaged or Removed Structures
                                          Check for damage to structure                      and every two months             Replace damage structure
 (e.g. pit lids or grates)
                                                                                             during wet seasons
                                          Check for blockages, litter accumulation,                                           Remove litter, debris and sediment accumulation
 Sediment, Litter or Debris
                                          sediment or debris.                                                                 Check capacity of upstream Gross Pollutant Trap for clean out.2
 Batter Slopes and Base Invert
                                                                                                                              Where erosion is only minor undertake filling, profiling, and (if
                                                                                                                              necessary) replanting using hand tools or light machinery. Where
 Erosion                                  Check for erosion along batter slopes
                                                                                                                              erosion is severe or reoccurring refer to WBD’s Rectifying Vegetated
                                                                                                                              Stormwater Assets (2012).
 Depressions, mounds or isolated          Check for surface depressions or mounds                                             If depressions or mounds are >100mm then undertake filling, re‐
                                                                                             Quarterly during dry season
 pools of water                           that could provide mosquito habitat                                                 profiling, and (if necessary) replanting.
                                                                                             and every two months
                                                                                                                              In areas where accessibility is safe & achievable remove litter
                                                                                             during wet seasons
 Litter                                   Check for litter                                                                    immediately. Where accessibility is restricted undertake litter
                                                                                                                              removal litter when there is more than 1 piece of litter per 4m2
 Unusual Odours, Colours or
                                          Check for unusual odours, colours and
 Substances                                                                                                                   Remove polluted material before it moves through the WQCP.
                                          substances
 (e.g. oil and grease)
                                                                                             Regular inspection as            Remove sediment in dry weather or after a dry season.
 Accumulated Sediment1                    Check for accumulated coarse sediment.             above. Clean out every 5         If major clean out is required follow procedures outlined in WBD’s
                                                                                             years                            Maintaining Vegetated Stormwater Assets (2012).

                                          Check that the water level is not more than        Quarterly during dry season      Check outlet for damage or WQCP for possible leakages. Repair
 Water levels                             0.3m below the normal operating level for          and every two months             where necessary. If there are no blockages refer to WBD’s Rectifying
                                          extended period                                    during wet seasons               Vegetated Stormwater Assets (2012).




                      * Significant Rain Event defined as a 24 hour period with rainfall greater than 100mm, or shorter period with an average rainfall intensity greater than 50mm/hour.
1. Maintenance Requirements are based on Water by Designs, Maintaining Vegetated Stormwater Assets (2012) and Rectifying Vegetated Stormwater Assets (2012). Refer to these documents for further details.
                                                2. Refer to latest version of HumeGard Maintenance Guide for details of inspection and maintenance procedures.