Rule 7 Medium sized internal or external combustion engines, heating appliances and electrical generation plants
The discharge of contaminants into air in connection with any combustion process (other than discharges of contaminants to air from mobile transport sources, which are not controlled by this Plan) involving:
(1) the use of an internal or external combustion engine, heating appliance or electrical generation plant(s) with a combined generation capacity of more than 2 MW but not exceeding 5 MW (measured by the higher heating value of the input fuel);
is a Controlled Activity, provided it complies with the standards below.
The person(s) responsible for the activity shall ensure that:
(i)there is no discharge of particulates of a concentration greater than 250 mg/m (at STP), measured at the point of discharge; and
(ii) there is no smoke, dust, odour, gas or vapour from the discharge, which is noxious, dangerous, offensive or objectionable at or beyond the boundary of the property.
Note: The burning of materials explicitly excluded from Rule 19 is a discretionary activity. While an activity may appear to be controlled under Rule 7, it is a discretionary activity if it involves burning of one of the materials listed in Rule 19 e.g., the use of untreated waste oil as a combustion fuel.
The Wellington Regional Council shall exercise control over:
(a)the height and design of chimneys/discharge points (see Appendix 3);
(b)the taking and supplying of samples;
(c)the carrying out of measurements, samples, analyses, surveys, investigations or inspections, at the consent holder's expense;
(d)the provision of information to the Wellington Regional Council at specified times, at the consent holder's expense;
(e)compliance with monitoring, sampling and analysis conditions at the consent holder's expense; and
(f)the payment of administrative charges and financial contributions.
Explanation of Rules 6 and 7: Rules 6 and 7 relate to the discharge of contaminants to air from small and medium scale internal or external combustion engines, heating appliances and electrical generation plants. Both rules apply to industrial or trade premises and other premises such as apartment blocks, office buildings, hotels, electrical generation plants, and domestic premises. The rules do not cover the discharge of contaminants from mobile transport sources.
Both Rules 6 and 7 apply regardless of the fuel being used. Rule 6 permits discharges from facilities with a combined generation capacity of 2 MW or less (measured by the higher heating value of the input fuel), subject to compliance with the stated conditions. The discharge of contaminants from facilities with a generation capacity greater than 2 MW but less than 5 MW are covered by Rule 7 and are controlled activities, and again are subject to the stated conditions. Discharges of contaminants from facilities with a combined generation capacity equal to and greater than 5 MW are discretionary activities covered by Rule 23. Similarly, processes otherwise covered by Rules 6 and 7 which cannot meet the conditions, are discretionary activities and are also covered by Rule 23. The limits indicated in Rules 6 and 7 apply to the cumulative total heat released from a particular premises (based on the higher heating value of the input fuel).
Rule 7 deals with medium to large scale processes. These activities are controlled activities for which a resource consent must be obtained from the Council, because of the greater potential for adverse effects resulting from the discharges. Instead of explicit conditions relating to avoiding or minimising the adverse effects of downwash from the point of discharge, the Council has chosen to reserve its discretion about the height and design of the discharge point. The Council will establish the height and design of chimneys/discharge points based on guidelines for making such assessments, as detailed in Appendix 3. For larger discharges dispersion modelling work may be required to assess likely effects on surrounding areas.
The conditions require that discharges do not generally exceed an opacity of 20 percent, that there is no discharge of particulates of a concentration greater than 250 mg/m 3 (at STP) measured at the point of discharge, that there are no noxious, dangerous, offensive or objectionable discharges. Rule 6, relating to smaller scale processes includes two further sets of conditions (conditions iii and iv) which are aimed at ensuring against fugitive emissions and minimising the adverse effects from downwash. These conditions have the added benefit of enabling greater ease of monitoring.