74 12 Apart from exceptional circumstances, maintenance and desilting of the Main Collection Pond shall only occur during periods of projected fine weather. 13 No chemicals or additives shall be used in the Main Collection Pond or the discharge from the pond without the prior written approval of the Waikato Regional Council. Discharges and Monitoring 14 Subject to health and safety restrictions, the Consent Holder shall monitor the discharge from each Main Collection Pond overflow event not authorised under Condition 7. Monitoring shall comprise the parameters described in Table 1: Table 1 – Main Collection Pond Overflow Monitoring Parameters pH Conductivity Suspended solids Total ammonia Heavy metals (Iron, manganese, copper, nickel, zinc, silver, antimony, arsenic, selenium, cadmium, chromium (iv), lead and mercury. Table Note: The Main Collection Pond 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 the 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 the 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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