Contamination Delivery Work Plan
5.
Contamination management 5.1 Overview
This section details the procedures for the management of contaminated media (soil, groundwater and surface water) during the Mt Eden Enabling Works. It includes control measures for reducing human exposure to contaminated soils and water and minimise contaminated discharges to air, land and/or water. These measures must be established prior to commencing and maintained during earthworks associated with the Mt Eden Enabling Works. The Council (Team Leader Central Monitoring) is to be notified at least two working days prior to any of the earthworks.
5.2 Excavation of contaminated soil While the protocols below can be applied to all earthworks associated with the Mt Eden Enabling Works, contamination has only been identified within fill. The following is most relevant to disturbance within fill: • • •
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Erosion and sediment controls shall be implemented in accordance with the ESCP prepared for the Mt Eden Enabling Works before earthworks commence; Excavated spoil shall be placed directly into a truck for immediate off-site disposal, where practicable; Excavated spoil classified as contaminated fill (refer Section 5.3) retained on site as part of contingency storage shall be placed within erosion and sediment controls and covered when not being worked and weather conditions dictate so as to minimise dust and runoff (additional details for management of stockpiles detail in the Air Quality DWP (AQ DWP) prepared for the Mt Eden Enabling Works); Spillages of soil during placement in trucks shall be cleaned up as soon as practicable following the spillage. Spillages shall not be left unattended as contaminated soil could be trafficked by trucks and transported off-site; and The earthworks shall be observed by the CLS. If unexpected contamination is encountered during works, the works shall cease in the immediate vicinity and the procedures documented in Section 7 of this C DWP shall be followed.
5.2.1. Additional requirements for asbestos contaminated soils The management of asbestos in soils is regulated under the Health and Safety at Work (Asbestos) Regulations 2016 (Asbestos Regulations). In order to help achieve compliance with the Asbestos Regulations, WorkSafe New Zealand has prepared an Approved Code of Practice (ACoP): Management and Removal of Asbestos (September 2016). The ACoP refers readers to the NZ Asbestos in Soil Guidelines. The key requirements of the Asbestos Regulations and ACoP are that works involving asbestos contaminated soils must be undertaken with appropriate asbestos controls in place and that contaminated soil removed from site must be taken to an approved disposal site. Table 5-1 provides a summary of the controls indicated in the NZ Asbestos in Soil Guidelines for different concentrations of AF/FA and ACM. The results of the limited asbestos in soil investigations undertaken specifically within the South Pacific Timber site indicate the presence of trace asbestos in fill soils. Disturbance of surficial fill material on the South Pacific Timber site shall be undertaken, as a Page 18
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