Appendix A: ISCA Requirements

Table A identifies the ISCA Credit Requirements relevant to this Contamination DWP and where they are addressed in the documents.

Credit Requirements *

Whenua (Land)

Lan-3 Level 1 Site assessment follows the recommended approach in ‘CLMG No.5 Site Investigation and Analysis of Soils’. Relevant Section Other Relevant Information / Comments

Section 3 A site assessment has been completed in the vicinity of the Mt Eden Enabling Works area as part of the wider CRL project. Specific assessments have not been undertaken within the Mt Eden Enabling Works area, with the exception of the South Pacific Timber site (21 Ruru Street).

Lan-3 Level 1

Lan-3 Level 2 Remediation options are identified and selected using a sustainability hierarchy. Sections 5.3, 5.4, 5.6 and 7.

Sustainability appraisal of remediation options is undertaken against the sustainability indicators in Table 1 of ‘A Framework for Assessing the Sustainability of Soil and Groundwater Remediation’. Shallow contaminated fill (and underlying natural material) needs to be removed as part of the Mt Eden Enabling Works. The spoil within the Mt Eden Enabling Works area needs to be removed and disposed of offsite to enable this component of the CRL project to be realised. Due to the urban and constrained nature of the works area there is no location within the CRL project area for soils to be retained or returned to site. Disposal of soil from the Mt Eden Enabling Works shall be based on the soil classification hierarchy and approval process that is outlined in Sections 5.3 and 5.4 of this C DWP. If unexpected soil contamination is identified, the requirements of Section 7 of this C DWP are to be implemented and soil remediation and management options will be assessed using the ISCA sustainability hierarchy approach as applicable.

Receiving Wai (Water) Quality

DIS-1 Level 1 Measures to minimise adverse impacts to receiving wai environmental values during construction and operation have been identified and implemented. These measures demonstrate an awareness of the values of wai ora and its Mauri, and

Section 5.6 A Water Discharge Quality Monitoring Programme (WDQMP) has been developed which specifies the monitoring to be undertaken for the Mt Eden Enabling Works. The WDQMP is included within the FTMP and provides specific requirements on the discharges to the receiving environment (Motions Creek

Credit Requirements * Relevant Section

Whenua (Land)

opportunity for mana whenua feedback has been provided and where practicable incorporated into these measures. AND Monitoring of wai discharges and receiving wai is undertaken at appropriate intervals and at times of discharge during construction. Other Relevant Information / Comments

and ultimately the upper Waitemata Harbour).

ISCA Lan-3 sustainability hierarchy

The ISCA Lan-3 sustainability appraisal process includes the following sustainability hierarchy for remediation:

If practicable, on site treatment of the contamination so that it is destroyed or the associated risk is reduced to an acceptable level. Off-site treatment of excavated soil, so that the contamination is destroyed or the associated risk is reduced to an acceptable level, after which soil is returned to the site. Consolidation and isolation of the soil on site by containment with a properly designed barrier. Removal of contaminated material to an approved site or facility, followed, where necessary, by replacement with appropriate material. Where the assessment indicates remediation would have no net environmental benefit or would have a net adverse environmental effect, implementation of an appropriate management strategy.

If an option less favourable than the first option is selected, then justification for not selecting options higher on the hierarchy must be provided. In cases were no readily available or economically feasible method is available for remediation, it may be possible to adopt appropriate regulatory controls to develop other forms of remediation.