PART Response to Information Request · OPW11/0335

1. Objectives/Targets       To reduce the transport capacity of stormwater exiting the site, and remove
                            sediment from stormwater entering the site.
                            To prevent pollutants from the building site entering Noosa National Park
2. Management Strategy      1) Slow the velocity of stormwater flowing across the building site;
                            2) Use sediment fences to pond stormwater at strategic points in the building site, so
                            that suspended sediment can settle;
                            3) Direct stormwater from sediment fences over grass filter strips onto which
                            suspended sediment can settle.
                            4) Install filter socks in the sediment fence against the wetland to passively filter
                            sediment from stormwater entering the terminal wetland, and
                            5) Sediment curtain in the terminal wetland to contain sediment that may have
                            passed the upstream control measures.
3. Tasks/Actions            1) Install geo-textile sediment fences on the lower slopes of the building site. Posts
                            should be minimum of 2 m spacing, the base should be buried at least 200 mm
                            below ground. the fences should be concave upslope to bund stormwater. while
                            allowing lateral overflow down-slope;
                            3) Stabilise ground that accommodates overflow from the sediment fences to avoid
                            rill development. Refer to EP-SECP-05;
                            4) Direct overflow into down-slope sediment fence. Filter socks will be used as a
                            final barrier to contain suspended sediment. Overflow through the filter socks wi
                            into the terminal wetland. Use water from the terminal wetland to irrigate group,
                            cover (refer to EP-SECP-05);
                            5) Install a sediment curtain in the terminal wetland to contain any fine sediment
                            overtopped stormwater. This sediment will settle out in the wetland hohind th('
                            sediment screen.
                            6) Install temporary downpipes from newly constructed roof,.
4. Performance Indicators   1) No rill development;
                            2) Low turbidity of sediment in overflow from the sediment fence into the terminal
                            wetland;
                            3) Containment of stormwater behind the sediment curtain in the terminal wetland;
                            and
                            4) Prompt connection of temporary downpipes on the building site.
5. Monitoring               1) Rills are absent from the building site;
                            2) Build up of sediment behind sediment fences should be no more than 1/3 of the
                            fence height;
                            3) Sediment fences should be structurally sound;
                            4) Suspended solids in overtopped stormwater entering the terminal wetland are not
                            excessively high when compared with suspended solids entering the construction
                            site.
6. Frequency/Deadlines      1) Inspection for rills: immediately after rainfall events,
                            2) Inspection of sediment fences for structural integrity and sediment accumulation:
                            weekly and immediately after a rainfall event;
                            3) Suspended solids of stormwater flowing into and out of the building site: during
                            stormwater events.
                            4) Inspection of temporary downpipe connection: after roof installation.
7. Responsibilities         Building contractor.
8. Reporting and Review     Exception reporting to the site manager and senior management.
9. Contingency              When significant loss of sediment down-slope is occurring:


                            1) Report situation to site manager immediately, and request support;
                            2) Divert flow upstream away from point of failure;
                            3) Bridge the point of failure using sandbags;
                            4) Collect water quality samples at inflow and outflow points (section 11);