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  Council » Policies and Plans » Rules and regulation » Waikato Regional Plan » Waikato Regional Plan (online version) » 8.1 Assessment Criteria and Information Requirements » 8.1.5 Air

8.1.5 Air

8.1.5.1 Chapter 6.1 – Discretionary and Non Complying Activity Rules

  1. The extent to which the Regional Ambient Air Quality Guidelines are complied with.
  2. The extent to which the discharge will have an adverse effect on ambient air quality.
  3. The extent to which the discharge will have an actual or potential adverse effect on the existing air quality characteristics of an area.
  4. The extent to which the discharge will have an adverse effect on human health and the health of flora and fauna.
  5. The extent to which the discharge will have an adverse effect on amenity values, including any objectionable effects as a result of an odour or particulate discharge (refer also to Guidelines for Assessment in Chapter 6.4).
  6. The extent to which the frequency, intensity, duration, offensiveness and location of the discharge causes adverse effects.
  7. The extent to which the discharge will be reduced at source.
  8. The nature of the discharge and the extent to which it is hazardous (refer Hazardous Air Contaminants List in Chapter 6.7).
  9. The existing air discharge sources in the area (point and non-point).
  10. The influence of meteorology and topography on the discharge.
  11. The extent to which the method of discharge is the most efficient and effective means of carrying out an activity.
  12. The extent to which any alternative location or method(s) of discharging any contaminant, such as into a different medium, was considered.
  13. Whether the option minimises any adverse effects on the environment.
  14. The extent to which tangata whenua as Kaitiaki concerns have been recognised and provided for.
  15. The extent to which the activity will have the potential to affect significant heritage sites1 or areas of historic and cultural significance.
  16. The extent to which the discharge creates actual or potential effects on other receiving environments (i.e. land or water).
  17. The extent of any consultation undertaken (as per the reporting requirements in Schedule Four of the RMA).
  18. The extent to which the discharge creates actual or potential effects on the global atmosphere (within the scope of central government policy).
  19. The extent to which to which the discharge creates cumulative effect which may arise over time or in combination with other effects.
  20. Any effects of low probability but high potential impact.
  21. Whether management plans and contingency plans have been provided.
  22. The risk of abnormal emissions and the level of control employed.
  23. The extent to which relevant codes of practice or other guidelines are adhered to.
  24. The extent to which the discharge may affect aircraft safety.
  25. Any other relevant matters.

8.1.5.2 Chapter 6.2 – Discretionary Activity Rule – Discharge of Agrichemicals to Air

  1. The proximity of occupied dwelling houses, public land and other areas where people reside or congregate, in relation to the proposed activity.
  2. The sensitivity of neighbouring land uses and features.
  3. The effect of prevailing weather conditions, including wind speed and direction.
  4. The extent to which the agrichemical causes, or is linked to, chronic or acute human health effects, odour, annoyance, and adverse effects on amenity values.
  5. The extent to which the agrichemical causes adverse effects on non-target flora, fauna and ecosystems (particularly water).
  6. The type of agrichemical and carrying agent to be discharged.
  7. The proposed method of application, including the type of spray equipment to be used, the spray volume and droplet size, the direction of the spraying and the height of release above the ground.
  8. The nature of any training undertaken by the operator in respect of the use of agrichemicals.
  9. The extent to which the applicator can avoid spray drift.
  10. Records to be kept and notification of potentially affected parties to be undertaken.

8.1.5.3 Further Information – Modelling From Consent Applicants

Chapter 6.4 of the Plan gives an indication of when modeling is likely to be required for investigating objectionable effects as a result of odour and particulate mater. Modelling may also be necessary for investigating other contaminants and their effects. Applicants should consult Waikato Regional Council in the early stages of preparing a consent application to determine whether dispersion modelling is required for the assessment.

The applicant should model contaminant levels that result in predicted ground level concentrations that are likely to be of an order of magnitude that would be of concern. Waikato Regional Council considers that the use of dispersion modelling is particularly relevant for evaluating various upgrade scenarios, such as investigating the effects as a result of installing air pollution control equipment. Applicants should model the expected normal emissions as well as the likely worst case emissions. If the worst case assessment is well within accepted criteria then there should be no need for any further assessment.

In general, the information provided with an air dispersion model should include discussion on the use of the dispersion models together with the use of terrain information and meteorological data. The information presented will need to include summaries of all input data and assumptions used in the model, the justification for the choice of model and the modes in which it is run, a discussion of uncertainties and model output tables. The modelling then needs to be interpreted with reference to relevant ambient guidelines and other criteria.

Waikato Regional Council requires the following specific information to be submitted with a modelling assessment:

    1. A discussion of the model and the justification for the use of the particular model.
    2. How particular model settings were used and other model assumptions were made.
    3. The influence of terrain and other local effects such as sea breezes.
    4. A description of the contaminants in the discharge.
    5. The source emission data used in the model and other model input data such as stack and building dimensions.
    6. A description of the meteorological data used.
    7. Tables and graphical presentations of the predicted maximum ground level concentrations for each contaminant at regular and appropriate intervals from the discharge points.
    8. Model output tables.
    9. A comparison of the predicted maximum ground level concentrations with the appropriate guideline or other criteria.
  1. Model interpretation including a discussion and conclusions on the likely effects on the environment taking into account background levels of contaminants and other sources in the vicinity as appropriate and a discussion on model uncertainties.

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