Stormwater Treatment & Water Quality Management Plan_April2014

maintenance                                                                                          necessary) following first
                     Remove accumulated sediments at inlet
                                                                                                     year.
                     Remove impermeable layer (such as oily or clayey sediment)
                      if water ponds for more than a few hours
                     Remove weeds and dead plants
                     Replace plants where necessary (8-10 plants per m2 is
                      required). Ensure even spacing of plants.
                     Water plants as necessary
                     Check if a small clear flow is discharging from seepage pipe
                      to overflow pit after soaking rain. Repair blockages in pipes if
                      necessary
                     Treat plants for disease, pests etc.
                     Water plants as necessary
                     Reinstate areas that have eroded and holes in media
                     Ensure energy dissipation at entry and exit points is adequate
                      and repair if necessary
                     Ensure builder is aware that when working upstream they are
                      to block inlet to biopod with filter bags and ring edge with
                      sediment fence.
Every ten years      Remove the top 50mm of filter material                               Council   Every ten years (or as
                                                                                                     necessary)
                     If after the removal of the top 50mm of filter material the water
                      ponds for more than 2 hours after inflow stops. Test hydraulic
                      conductivity of filter media (Replace filter media if conductivity
                      is below the minimum of 50 mm/hr).
Inspections          Carry out three monthly inspections of the system and inspect        Council   Every six months –or as
                      the following:                                                                 necessary.
                         o   Sediment build up on surface
                         o   Impermeable layer (such as oily or clayey sediment)
                             build up