24647 Seaview Tce Enviro Mgmt Plan

                                                                                                    EWSM- 1 EROSION AND SEDIMENT CONTROL (STORMWATER MANAGEMENT)
                                                                                                                                                          Version 1


Hierarchy of Control (HOC): 1. Eliminate 2. Substitute 3. Isolate 4. Engineer 5. Admin 6. PPE

Work platforms connected to the    Concentrated flow might cause          5      Roof water downpipes (temporary or permanent) should be                    Hutchinson Builders
stormwater system shall be         erosion                                        connected to the stormwater drainage system immediately after the          Foreman
maintained in good order and                                                      roof is laid.
cleaned frequently of
sediment/debris which may enter                                                                                                                              Workers
the system                         Inappropriate and ineffective          5      Sediment control devices must be de-silted and made fully                  Hutchinson Builders
                                   sediment control measures                      operational as soon as reasonable and practicable after a sediment-        Foreman
                                                                                  producing event, whether natural or artificial, if the device's sediment
                                                                                  retention capacity falls below 75% of its design retention capacity.
                                                                                                                                                             Workers


                                   Inappropriate and ineffective          5      Sediment fence is buried in 200mm deep. Along the lower side of the        Hutchinson Builders
                                   sediment fence                                 trench, appropriately secure the stakes into the ground spaced no          Foreman
                                                                                  greater than 3m if supported by a top support wire or weir mesh
                                                                                  backing, otherwise no greater than 2m
                                                                                                                                                             Workers
                                                                                 In areas where it is impractical to bury the lower edge of the sediment
                                                                                  fence, the lower 200 mm (min) portion of the fabric should be placed
                                                                                  on the ground up-slope of the fence and buried under a 100 mm (min)
                                                                                  layer of coarse aggregate (20-40 mm)
                                                                                 Sediment fences should be located down-slope of the disturbance,
                                                                                  and ideally along a line of constant land level to prevent the
                                                                                  concentration of stormwater run-off. Where this cannot be achieved
                                                                                  then sections of the sediment fence should have ‘returns’ directed up
                                                                                  slope for 1-2 metres to control the concentration of stormwater run-
                                                                                  off
                                                                                 Replace sediment fences if the fabric is ripped or otherwise damaged.
                                                                                  The maintenance of sediment fences includes the removal of
                                                                                  sediment deposited up-slope of the fence and, where necessary, re-
                                                                                  trenching the fabric and ensuring posts are firmly secured in the
                                                                                  ground                                                                     HSE Advisor
                                                                                 If excessive sediment build-up occurs, reapply crushed rock to the
                                                                                  entry/exit pad.
                                                                                 Daily check on sediment fence
Trenching                          Sediment-laden water ponding on       5       No more than 150m of a stormwater, sewer line or other service             Site Manager
                                   site                                           trench must to be open at any one time.
                                                                                 Where it is practical, trench needs to be backfilled when the
                                                                                  significant event is forecasted




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