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  Council » Policies and Plans » Rules and regulation » Waikato Regional Plan » Waikato Regional Plan (online version) » 6.1 Regional and Local Air Management » 6.1.17 Implementation Methods - Metal Processing

6.1.17 Implementation Methods - Metal Processing Permitted Activity Rule – Metal Processing

The discharge of contaminants into air associated with any production or processing (including melting and secondary melting and sweating) of aluminium, ferrous metals, bronze, copper or brass where the aggregated melting capacity not exceeding one tonne per hour, is a permitted activity subject to the following condition:

  1. As specified in Section 6.1.8 conditions a) to e) of this Plan.

Advisory Notes:

  • If good practice is applied in conjunction with this Rule then adverse effects beyond the boundary from this scale of activity should not occur.
  • Metal processing operations may also include activities covered by rules under Sections 6.1.9 miscellaneous permitted activities, 6.1.10 abrasive blasting, 6.1.11 spray coating and 6.1.12 combustion processes. Also refer to the above rules, where relevant, to ensure that requirements of these rules are also met.
  • If any of these conditions are not complied with then the activity is a discretionary activity in accordance with Rule

Explanation and Principal Reasons for Adopting Method
Rule is restricted to the discharge of contaminants to air involving the processing of aluminium, ferrous metals, bronze, copper and brass. This includes the melting of these metals including secondary melting and the sweating of scrap metal. Secondary melting involves the melting of processed ore, whereas the sweating of scrap metal is a process involving the heating, usually of metal components, to extract valuable metals.

The production and processing of metals at a rate where the aggregated melting capacity is less than one tonne per hour are not likely to result in any adverse effects. Any activity that does not meet the thresholds or conditions in this permitted activity rule is a discretionary activity (refer Rule This is because of the potential significant adverse effects on human health from the discharge and the potential to release objectionable contaminants into the atmosphere including those of a hazardous nature.

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