178 12 Apart from exceptional circumstances, maintenance and desilting of Collection Ponds (S6 and S7) shall only occur during periods of projected fine weather. All silt for removal shall be disposed of to a tailings storage facility. 13 No chemicals or additives shall be used in Collection Ponds (S6 and S7) or the discharge from the ponds without the prior written approval of the Waikato Regional Council. Discharges and Monitoring 14 Except where Condition 7(e) applies the Consent Holder shall monitor the discharge from Collection Ponds (S6 and S7) during any overflow event. Monitoring shall comprise the parameters described in Table 1: Table 1 – Collection Ponds (S6 and S7) Overflow Monitoring Parameters pH Conductivity Suspended solids Cyanide (WAD) Total ammonia Heavy metals (Iron, manganese, copper, nickel, zinc, silver, antimony, arsenic, selenium, cadmium, chromium (iv), lead and mercury. Table Note: The Collection Ponds (S6 and S7) overflow monitoring programme for metals is for ‘acid-soluble’ concentrations determined on unfiltered samples. 15 Results of the monitoring undertaken in accordance with Condition 14 shall be forwarded to Waikato Regional Council quarterly. 16 All water quality sampling and analysis shall be undertaken using Standard Methods for the Examination of Water and Wastewater (19th Edition 1995, or updates), APHA, AWWA and WEF, unless otherwise agreed in writing by Waikato Regional Council. Analyses shall be undertaken at an appropriately certified laboratory. All other measuring, testing, recording and analytical methods as may be required from time to time pursuant to the requirements of this consent shall be to the satisfaction of the Waikato Regional Council.
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