Development Application Part 2 - Environmental & Stormwater Management Plans · OPW11/0335

EP-SECP-06: Stabilizing soil stockpiled for Stage 2 development
1. Objectives/Targets        To avoid mobilising soil stockpiled in the Stage 2 development.
2. Management Strategy       1) Minimise exposure of unstable soil in stockpiles and disturbed ground.
3. Tasks/Actions             1) Install up-slope stormwater flow diversion (refer to EP-SECP-01);
                            2) Install down-slope sediment control (refer to EP-SECP-04
                            3) Use an erosion mat as a temporary measure to cover unconsolidated sediment
                            when bu iding the stockpile. Cover if rain is imminent, or when the stockpile is left
                            overnight. Peg down the edges of the erosion blanket.
                            4) Reseed stockpiled soils using hydro-mulch or equivalent. Lightly irrigate
                            reseeded area daily for four weeks to establish the grass surface.
                            4) Lay turf in areas down-slope of the stockpile where concentrated flow is expected
                            (e.g. at the overflow of sediment fences).
4. Performance Indicators   1) Stockpile covered with erosion mat (short term disturbance) or reseeded grass
                            (longer term after disturbance); and
                            2) Lack of surface erosion.
5. Monitoring               1) Temporarily disturbed ground is covered with erosion mats;
                            2) Reseeding and irrigation of bare ground is occurring;
                            3) 100% vegetation cover 4 weeks after establishment;
                            4) Rills are not present on the building site;
                            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;
                            3) Reseeding and irrigation schedule is being maintained: daily;
                            4) Rills on the building site. after stormwater events, and
                            5) Suspended solids in water entering and exiting the site: during stormwater
                            events
7. Responsibilities         Building contractor.
8. Reporting and Review     Exception reporting to the site manager and senior management.
9. Contingency              When water is flowing over unstable ground:


                            1) Use sandbags to divert flow from upstream away from unstable ground onto
                            stable ground;
                            3) Cover the point of failure using erosion mats;
                            4) Collect water quality samples at inflow and outflow points (section 11);
                            5) Report situation to site manager;
                            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 Noosa
                            National Park;
                            2) Ensure that erosion mats are intact and properly installed;
                            3) Ensure that re-seeding and irrigation is occurring. Install additional erosion mats.
                            grass cover, or turf if necessary.