Response to Information Request - Received on 19/04/2012 · OPW11/0335

                                                                                                                                 4) Rills on the building site: after stormwater events; and
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                                                                             .;t.,                                               5)Suspended solids in water entering and exiting the site: during
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                                                                                                                                 stormwater events.

7. Responsibilities                                                                                                              Building contractor.
8. Reporting and                                                                                                                 Exception reporting to the site manager and senior management.
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9. Contingency                                                                                                                   When water is flowing over unstable ground:

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                                                                                                                  ]1’>"1         1) Use sandbags to divert flow from upstream away from unstable ground
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                                                                                                                                 onto stable ground;
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                                                                              ,                                                  3) Cover the point of failure using erosion mats;
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                                                                                                                                 4)Collect water quality samples at inflow and outflow points (section 11);
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                                                                                            ,                                    5) Report situation to site manager;
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                                                                                                                                 6)Implement corrective actions.
10. Corrective actions                                                                                                           1) Building contractor to reinforce the need for managing off site movement
                                                                                                                                 of disturbed soil because of the high environmental values associated with
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                                                                                                                                 2) Ensure that erosion mats are intact and properly installed;
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                                                                                                                                 3) Ensure that re-seeding and irrigation is occurring. Install additional
                                                                                                                                 erosion   m~ts. grass cover, or turf if necessary.

EP-SECP-06: Stabilizing soil stockpiled for Stage 2 development

1. ObjectivesfTargets                                                                                                            To avoid
                                  mobilisiq,g soi stockpiled inJhe Stage 2 development.
2. Management Strategy 1) Minimise exposute of unstable soil in ~tockpiles and disturbed ground.                                                        ’r                   ",




3. Tasks/Actions       1) Install up-slope stormwater flow diversi~n (refer to EP-SECP-01);
                                                                                                                                 2) Install down-slope sediment control (refer to EP-SECP-04
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                                                                                                                                 3) Use an erosion mat as a temQorary measure to cover unconsolidated
                                                                                                                                 sediment when building the stockpile. Cover if rain is imminent. or when the
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                                                                                                                                 stockpile is left.overlJjght. Peg dO"1l the edges of the erosion blanket.
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                                                                                                                                 4) Reseed stockpiled soils using hydro-mulch or equivalent. Lightly irrigate
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                                                                                                                                 reseeded area daily for four weeks to establish the grass surface.
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                                                                                                                                 4) Lay turf in areas down-slope of the stockpile where concentrated flow is
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                                                                                                                                 expected (e.g. at the overflow of sediment fences).
4. Performance                                                                                                                   1) Stockpile covered with erosion mat (short term disturbance) or reseeded
Indicators                                                                                                                       grass (longer term after disturbance); and
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                                                                                                                                 2) Lack of surface erosion.
5. Monitoring                                                                                                                    1) Temporarily disturbed ground is covered with erosion mats;
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                                                                                                                                 2) Reseeding and irrigation of bare ground is occurring;
                                                                                                                                 3) 100% vegetation cover 4 weeks after establishment;
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                                                                                                                                 4) Rills are not present on the building site;
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                                                                                                                                 5) Suspended solids in water exiting the site are not excessively higher than
                                                                                                                                 water entering the site.

6. Frequency/Deadlines                                                                                                           1) Cover with erosion mats: daily;

                                                                                                                                 2) Cover with grass: weekly;
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                                                                                                                                 3) Reseeding and irrigation schedule is being maintained: daily;
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                                                                                                                                 4) Rills on the building site: after stormwater events; and