Contamination Delivery Work Plan
5. Environmental Site Management Practices 5.1 Overview This section details the procedures for the management of potentially contaminated soil and groundwater during land disturbance activities. It includes control measures for management and mitigation of potentially adverse human health effects associated with exposure to contaminated media, and the control of discharges to air, land, and water.
5.2 Surface Water and Sediment Control Erosion and sediment control shall be implemented by the Link Alliance as described in the Project Erosion and Sediment Control Plan (ESCP) (Appendix H of the CEMP). All surface water and sediment control and monitoring will be managed by the Link Alliance through the ESCP.
5.3 Soil Excavation and Disposal 5.3.1. General Investigations of soil contaminant concentrations completed in support of this project (AECOM, 2012 and Golder 2014) identified that significant soil contamination was unlikely to be encountered during land disturbance works. There is however, the potential to encounter gravel like fill materials for which soil contaminant concentrations (of metals and heavy end hydrocarbons) are above applicable standards defined by the NES CS and AUP Permitted Activity Criteria. At that stage, there is no requirement for a remedial action plan to be produced for works within the project area. It is however possible that unexpected soil contamination or hazardous materials could be discovered during the land disturbance works. If unexpected soil contamination is identified the management practices outlined in Section 7 should be implemented.
5.3.2. Oversight/Supervision The CLS will undertake regular inspection and/or supervise soil disturbance activities associated with the construction works.
5.3.3. General Disposal Requirements Most of the spoil material generated as part of the Aotea Station main works will likely be removed from the works area and disposed off-site. Any natural soil materials, including Tauranga Group sediments and East Coast Bays Formation materials, have been assessed as suitable for disposal as cleanfill. Any fill material required to be removed from the works area will be removed from the site (to off-site disposal) immediately, or temporarily stockpiled in covered and/or bunded areas onsite (depending on the requirement for additional testing, if requested by the disposal facility). A summary of preliminary soil classifications for the project is provided in the following sub-sections
5.3.2.1 Cleanfill Cleanfill is defined in the AUP (2019): “Means natural material such as clay, gravel, sand, soil and rock which has been excavated or quarried from areas that are not contaminated with manufactured chemicals or chemical residues as a result of industrial, commercial, mining or agricultural activities. Excludes: Page 17
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