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

Maintain site entry point          Illegally discharge sediment to        5      Washing/flushing of sealed roadways must only occur where                Site Manager
                                   stormwater drainage                            sweeping has failed to remove sufficient sediment and there is a
                                                                                  compelling need to remove the remaining sediment (e.g. for safety
                                                                                  reasons). In such circumstances, all reasonable and practicable
                                                                                  sediment control measures must be used to prevent, or at least
                                                                                  minimise, the release of sediment into receiving waters. Only those
                                                                                  measures that will not cause safety and property flooding issues shall
                                                                                  be employed. Sediment removed from roadways must be disposed
                                                                                  of in a lawful manner that does not cause ongoing soil erosion or
                                                                                  environmental harm
Discharge water after the rain     Unauthorised sediment-laden water      5      Stop all pumping in the vicinity and notify your supervisor              Site Manager
event                              discharge resulting in impact to              Contain discharge where possible
                                   waterways and possible
                                   prosecution                                   Only discharge if water has been tested and passed the criteria or it
                                                                                  must be treated.
                                   Water quality does not meet            5      All water quality data, including dates of rainfall, dates of testing,   HSE Advisor
                                   discharge criteria                             testing results and dates of water release, must be kept in an on-site
                                                                                  register. The register is to be maintained up to date for the duration
                                                                                  of the approved works and be available on-site for inspection by
                                                                                  company environmental representative or regulator on request.
                                                                                - pH is within 6.5-8.5
                                                                                - Turbidity is <75NTU or TSS <50mg/L
                                                                                 Treat water with flocculating agents (e.g. Aluminium Sulfate, or
                                                                                  Gypsum. Note that Aluminium Sulfate will greatly decrease pH level
                                                                                  in the water. It must be used in the conjunction with Hydrated Lime to
                                                                                  balance out the pH)
Maintain sediment basin/tank (if   Erosion and sediment control           5      Clean out accumulated sediment when it reaches the marker                Site Manager
applicable)                        measures are not in good order and             board/post, and restore the original storage volume.
                                   not ready for the significant rain
                                   events
Rehabilitation                     Environmental harm caused by           5      Exposed soil surfaces need to be stabilised as soon as practicable to    Site Manager
                                   erosion and soil loss                          prevent, or at least minimise potential environmental harm. Once
                                                                                  stabilised, these areas need to be revegetated or otherwise
                                                                                  rehabilitated to ensure appropriate long-term erosion control.




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