2. Mangatawa catchment consents for earthworks, storm water ...
2. Mangatawa catchment consents for earthworks, storm water ...
2. Mangatawa catchment consents for earthworks, storm water ...
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• Installation of Stage 2 decanting earth bund;<br />
• Stage 2 <strong>earthworks</strong>;<br />
• Progressively stabilise completed areas as soon as practicable.<br />
Storm<strong>water</strong> Wetland<br />
• Construction of perimeter controls such as silt fences;<br />
• Stage 1 <strong>earthworks</strong>;<br />
• Stage 2 <strong>earthworks</strong>;<br />
• Construction of dam weir;<br />
• Diversion of clean <strong>water</strong> entering wetland through the new Stage 2 channels;<br />
• Stage 3 <strong>earthworks</strong>;<br />
• Construction of outlet;<br />
• Progressively stabilise completed areas as soon as practicable;<br />
• Construction of perimeter controls such as silt fences and bund in Phase 2;<br />
• Phase 2 <strong>earthworks</strong>;<br />
• Open Phase 2 to Phase 1.<br />
5 Monitoring and Maintenance<br />
Erosion and sediment control measures will be installed, monitored and maintained throughout the<br />
works until the site is stabilised. The table below outlines inspection and maintenance requirements<br />
<strong>for</strong> erosion and sediment controls that are to be implemented in this ESCP.<br />
Control Type Inspection and Maintenance Requirements Frequency<br />
Silt fence • Check that silt fences are toed in correctly.<br />
• Check <strong>for</strong> tears and other damage.<br />
• Any areas of collapse, decomposition or ineffectiveness<br />
are to be replaced immediately.<br />
• Remove silt build ups when bulges develop or when<br />
deposition reaches 50% of the silt fence height.<br />
Diversion<br />
bunds and<br />
channels<br />
Sediment<br />
Retention<br />
Pond<br />
Decanting<br />
Earth Bund<br />
• Ensure they are in the correct place (clean <strong>water</strong><br />
diverting flows away from the work area and sedimentladen<br />
flows directed to sediment treatment devices).<br />
• Inspect <strong>for</strong> signs of scouring or collapse and repair<br />
immediately if required.<br />
• Remove any material that may have accumulated.<br />
• General inspection<br />
• Clean out sediment build up in <strong>for</strong>ebay<br />
• Check outlet <strong>for</strong> blockages<br />
• Check level spreader<br />
• Check discharge points <strong>for</strong> scour<br />
• Check that outlet is not blocked<br />
• Remove built up sediment from around base<br />
Daily<br />
Daily<br />
As required<br />
As required<br />
Daily<br />
Daily<br />
As required<br />
Weekly<br />
As required<br />
Weekly<br />
Weekly<br />
Weekly<br />
Daily<br />
As required<br />
Regularly and<br />
Beca // 1 April 2009 // Page 11<br />
3932036 // NZ1-1453076-10 0.10