144 10 The Consent Holder shall install an underdrainage system beneath the Northern Rock Stack to collect contaminated seepage from stockpiled PAF material, to minimise the release of seepage to ground. 11 The Consent Holder shall ensure that this underdrainage system is in place prior to the placement of PAF material in the Northern Rock Stack. 12 Until final capping is complete, the Consent Holder shall ensure that the pH of a slurry of one part solid (less than 4 mm size fraction) to two parts deionised water, of the surface of exposed PAF rock (after liming) remains greater than or equal to pH 5.5. Unless Waikato Regional Council agrees to an alternative sampling programme in writing, samples shall be collected on a grid pattern of not more than 50 m and, where practical, within 1 week of placement of the PAF rock and then at intervals not exceeding 4 weeks. This test is designed to help determine the potential for acid generation and sulphate release from waste rock. The procedure for collecting and analysing the samples shall be as described in the NRS Monitoring and Management Plan. 13 The Consent Holder shall, unless otherwise authorised in writing by Waikato Regional Council, collect all underdrainage flow from the Northern Rock Stack and divert it to the Water Treatment Plant for treatment or for use in the process plant. 14 The Consent Holder shall provide the Peer Review Panel with all records, plans, designs, etc, that they request, and shall afford the Panel full access to the site at all reasonable times. 15 The Consent Holder shall retain a person or persons with recognised documented experience in the design of rock storage facilities (the Designer). All aspects of the design of the Northern Rock Stack shall be undertaken under the supervision of the Designer, who shall prior to the placement of PAF rock in to the Northern Rock Stack, provide to Waikato Regional Council written confirmation that all aspects of the foundations, low permeability liner, underdrainage system, and surface water drainage system have been suitably investigated and properly and safely designed in accordance with currently accepted engineering practise, and designed to a standard adequate for the effective control of acid rock drainage. 16 The Consent Holder shall supply at least the following documentation to the Waikato Regional Council prior to commencement of the Northern Rock Stack construction works: a. Detailed Design Report b. Specification c. Drawings
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