CEMP - NZ Transport Agency

NZ Transport Agency
CSM2 & MSRFL
• setting vehicle speed limits;
• minimising and managing material spills.
All construction activities should follow the guidance set out in SEMP 001 Construction Air Quality
(Dust) is contained within Appendix A while chapter 18.5 of the AEE also contains a detailed list of
the proposed mitigation measures to be adopted for this Project.
CEMP Expectations for the appointed Principal Contractor
The guidance and expectations set out in SEMP 001 Air Quality Management Plan within Appendix A
of this CEMP of this CEMP should be reviewed and updated once a detailed construction programme
and build methodology has been agreed with the NZTA by the Principal Contractor and the
Construction Environmental Manager.
2.3.2 Erosion and Sediment Control (SEMP 002)
Potential Impacts
The scale of the Project means that a relatively large area of land will be disturbed. Erosion and
sediment control will need to be provided throughout the duration of the construction works and
maintenance period to ensure protection of the downstream receiving environment from the
adverse effects of sediment from the work area. As much of the receiving environment is
groundwater, the protection of the groundwater aquifer is also required.
Project-Specific Issues and Requirements
Key issues which will require addressing include:
• control of stormwater and isolating runoff from the stock-water network;
• separating clean from dirty water;
• protecting adjacent landowners from surface flows;
• minimise sediment leaving the site; and
• disposal to land.
One of the key mitigation measures is sediment retention ponds, where the number, sizing and
location of sediment retention ponds will be relative to the size of the land area subject to. Where
higher sediment loads are expected (typically in larger catchments and/or on steeper cut slopes)
the effectiveness of ponds will be increased through the addition of a chemical flocculation agent.
This causes sediment to bind together and hence fall out of suspension.
More detail regarding erosion and sediment control measures for the Project is set out in Appendix
B of the CEMP, which contains the Draft Erosion and Sediment Control Plan for key sectors of the
Project and section 19.5 of the AEE.
Draft 24 CEMP