169 subsequent embankment stages, the Consent Holder shall supply written confirmation to the Waikato Regional Council and the Peer Review Panel stating that the embankment structure and associated works have been constructed in accordance with the design referred to in Condition 18. Thereafter, the facility shall be inspected by a registered engineer on an annual basis, and a written report on the inspection provided to the Peer Review Panel and copied to Waikato Regional Council within one month of completion of the inspection. Monitoring 22 At quarterly intervals until mine closure, the Consent Holder shall measure and record the volume of storage provided by the available freeboard behind the embankment structure. This information shall be made available to Waikato Regional Council on request. 23 Throughout the period of mining the Consent Holder shall establish and maintain an inventory of sources and estimated volumes of available inert material. This inventory is to be updated at six monthly intervals and balanced against estimated future demand for inert material. This inventory shall be available upon request by Waikato Regional Council and the Peer Review Panel. In the event a shortfall occurs or is identified in advance, the Consent Holder shall prepare and implement contingency measures to ensure that proper control of geochemically active materials is maintained. A summary of the inventory and details of any measures which have needed to be taken shall be reported annually to Waikato Regional Council. 24 At monthly intervals the Consent Holder shall collect a sample of tailings being discharged to the tailings pond and shall determine its acid neutralising capacity (ANC), maximum potential acidity (MPA), and net acid generation (NAG) capacity. The date the sample is collected and the ANC, MPA and NAG results shall be reported to the Waikato Regional Council annually. 25 The Consent Holder shall install groundwater quality monitoring bores to detect any seepage bypassing the underdrainage system, and to determine the representative groundwater quality for shallow and deeper groundwater around the perimeter of land owned by the Consent Holder. Advice Note: All groundwater monitoring in these bores shall be based on the soluble test method, defined as the concentration of dissolved metals measured in that fraction which passes through a 0.45 µm filter. 26 Prior to placing PAF material within TSF3, the Consent Holder shall provide the Waikato Regional Council with 12 months baseline monitoring data sufficient to characterise the groundwater regime in the TSF3 catchment.
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