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Home >> Council >> Policy and plans >> Rules and regulation >> Waikato Regional Plan >> Waikato Regional Plan (online version) >> 6.1 Regional and Local Air Management >> 6.1.10 Implementation Methods - Discharges of Contaminants from Abrasive Blasting

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6 Air Module

6.1 Regional and Local Air Management

6.1.10 Implementation Methods - Discharges of Contaminants from Abrasive Blasting

6.1.10.1 Permitted Activity Rule – Abrasive Blasting with an Enclosure

The discharge of contaminants into air and any subsequent discharge onto land from abrasive blasting within a purpose built enclosure is a permitted activity subject to the following conditions:

  1. The blasting enclosure shall be fully enclosed and air shall be mechanically ventilated to air pollution control equipment that is designed and maintained to achieve a particulate matter concentration of not exceeding 100 milligrams per cubic metre (at zero degrees Celsius, one atmosphere pressure, dry gas basis), at the point of discharge from the enclosure.
  2. The person responsible for the abrasive blasting activity, upon request from the Waikato Regional Council, shall provide in writing details of the design standard and the maintenance procedures to confirm that the air pollution control equipment achieves the standard required by condition a).
  3. The discharge shall not result in any objectionable effects of particulate matter beyond the boundary of the subject property*.
  4. Any used or unused abrasive media not in use shall be kept covered and protected from the wind.


Advisory Note:

  • If any of these conditions are not complied with then the activity is discretionary activity in accordance with Rule 6.1.9.2.

6.1.10.2 Permitted Activity Rule – Wet Abrasive Blasting and Water Blasting

The discharge of contaminants into air and any subsequent discharge onto land or into water from wet abrasive blasting and water blasting is a permitted activity subject to the following conditions:

  1. The sand or any other material used for abrasive blasting shall contain less than five percent free silica on a dry weight basis.
  2. The discharge shall not result in any objectionable effects of particulate matter beyond the boundary of the subject property
  3. Any abrasive media not in use shall be kept covered and protected from erosion.
  4. All contaminated material and other associated debris that is discharged to land from the blasting shall be collected and removed from the site after blasting has been completed. The contaminated material and other associated debris shall be disposed of to a facility that has authorisation to accept the contaminants in the debris.
  5. Effective measures shall be taken to prevent as far as is practicable, the discharge of any hazardous particulate, floatable or suspendable material to any water body.


Advisory Notes:

  • Refer also to policies in Section 5.2.3 and enforcement method in Section 5.2.4.3 in the discharges to land section and discharges to water Section 3.5.4.5.
  • If any of these condition are not complied with then the activity is a discretionary activity in accordance with Rule 6.1.9.2.

 

6.1.10.3 Permitted Activity Rule – Dry Abrasive Blasting Outside of an Enclosure in Isolated Locations

The discharge of contaminants into air and any subsequent discharge onto land or water from dry abrasive blasting of fixed structures outside of a purpose built enclosure; and where the structure or item to be blasted is 200 metres or more away from any building occupied by people on a regular basis, including houses, hostels, meeting places, schools and hospitals or places of work (other than places of work within the property where the blasting is occurring), is a permitted activity subject to the following conditions:

  1. The owner or occupier of any property within 200 metres of the blasting site shall be advised in writing of the proposed work, including information about the dates and location of any abrasive blasting, no more than two weeks and no less than 48 hours before commencement of the work.
  2. The sand or any other material used for abrasive blasting shall contain less than five percent free silica on a dry weight basis.
  3. The discharge shall not result in any objectionable effects of particulate matter beyond the boundary of the property on which the abrasive blasting occurs.
  4. Any abrasive media not in use shall be kept covered and protected from wind erosion.
  5. All contaminated material and other associated debris that is discharged to land from the abrasive blasting shall be collected and stored in a manner that it does not become wind blown after blasting has been completed each day. On completion of the project the contaminated material and other associated debris shall be disposed of to a facility that has authorisation to accept the contaminants in the debris.
  6. Effective measures shall be taken to prevent as far as is practicable, the discharge of any hazardous particulate, floatable or suspendable material to any water body.


Advisory Note:

  • If any of these conditions are not complied with then the activity is a controlled activity in accordance with Rule 6.1.10.4.

6.1.10.4 Controlled Activity Rule – Dry Abrasive Blasting of Fixed Structures

Except as provided for in Rule 6.1.10.3, the discharge of contaminants into air and any subsequent discharge onto land or water from dry abrasive blasting of fixed structures outside a purpose built enclosure is a controlled activity (requiring resource consent) subject to the following standards and terms:

  1. The owner or occupier of any property or dwelling within 200 metres of the blasting site shall be advised in writing of the proposed work, including information about the dates and location of any abrasive blasting, no more than two weeks and no less than 48 hours before the commencement of the work.
  2. The sand or any other material used for abrasive blasting shall contain less than five percent free silica on a dry weight basis.
  3. All contaminated material and other associated debris that is discharged to land from the abrasive blasting shall be collected and stored in a manner that it does not become wind blown after blasting has been completed each day. On completion of the project the contaminated material and other associated debris shall be disposed of to a facility that has authorisation to accept the contaminants in the debris.
  4. Effective measures shall be taken to prevent as far as is practicable, the discharge of any hazardous particulate, floatable or suspendable material to any water body.
  5. Any discharge to air arising from the activity shall comply with the conditions and standards and terms in Section 6.1.8 except where the matters addressed in Section 6.1.8 are already addressed by conditions on resource consents for the site.

Waikato Regional Council reserves control over the following matters:

  1. Notification of the location and duration of the proposed operation to this Council.
  2. The type of blasting media to be used.
  3. Measures to avoid, remedy or mitigate the adverse effects on neighbouring dwelling places or properties.
  4. Measures to avoid, remedy or mitigate the adverse effects on water quality (as identified in the Water Management Class Maps of this Plan).
  5. Measures to avoid, remedy or mitigate the contamination of soil to levels that present a significant risk to human health or the wider environment.
  6. Qualifications of the operator/contractor.


Notification:

Applications for resource consent for activities under this Rule will be considered without notification in accordance with s94(1)(b) of the RMA.


Advisory Notes:

  • “Significant risk” in terms of soil contamination is defined in Chapters 5.2 and 5.3 of this Plan.
  • Refer also to Section 3.5.4.4 for discharges to water.
  • Good practice techniques already exist for this type of activity, including the Guide to Lead Paint Management, released by Standards Australia1.
  • Ministry of Health or Occupational Safety and Health should be contacted in relation to testing for particular contaminants in paint prior to commencing blasting so that appropriate methods can be put in place to ensure containment and minimise human exposure to such contaminants.
  • Information requirements to enable the assessment of any application under this Rule are as set out in Section 8.1.5.1. In addition assessment shall also take into account the matters identified in the policies in Section 6.1.3 of this Chapter.
  • If any of these standards and terms are not complied with then the activity is a discretionary activity in accordance with Rule 6.1.9.2.

Explanation and Principal Reasons for Adopting Methods 6.1.10.1 to 6.1.10.4
These rules apply to the discharge of contaminants to air from both industrial or trade premises and non-industrial or trade premises.

Abrasive blasting can release contaminants to air, land and water particularly where carried out in the open with no emission control equipment. The potential adverse effects of the activity include objectionable effects of particulate matter and adverse effects on human health from exposure to fine particulate matter. Where the blasting is removing lead paints, soil and water may become contaminated as a consequence of the activity.

Rule 6.1.10.1 addresses abrasive blasting undertaken within a purpose built enclosure. For the purpose of this Rule, a purpose built enclosure refers to a facility that is specifically designed and maintained to control ventilation and filtration of particulate matter. Blasting under this Rule is restricted to dry blasting using sand or other materials onto a surface.

Wet abrasive blasting is provided for in Rule 6.1.10.2. This Rule enables water blasting and the projection of wet sand and other materials onto a surface. This Rule permits wet abrasive blasting outside of a purpose built enclosure and includes both mobile and stationary sources subject to compliance with the specified conditions.

Rule 6.1.10.3 addresses dry abrasive blasting that is undertaken in isolated areas outside of an enclosure. Compliance with the separation distance to sensitive receptors as identified and notification of any propery owners or occupiers within 200 metres will enable the activity to occur in a manner that adverse effects can be avoided. Rule 6.1.10.4 enables the activity to occur in more built up areas provided that the operator confirms through a non-notified consent process that he or she can adequately avoid, remedy or mitigate adverse effects.

Abrasive blasting which does not comply with these rules is a discretionary activity under the Rule 6.1.9.2. This is because of the potential for significant adverse environmental effects from particulate matter on neighbouring properties and on the wider environment.

Although not provided for explicitly in these rules, resource consents under the controlled activity rule for dry abrasive blasting can be issued on a region-wide basis. Fixed structures can be issued on a region-wide basis, e.g. all bridges owned by Transit but not permanent sites. Permanent sites pertain only to a particular site for which consent has been applied for. This allows those operating in the abrasive blasting area, subject to observance of conditions, to undertake such activities on a wide range of premises or locations without having to again apply for consent each time a singular activity occurs.

 

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Footnotes

  1. Standards Australia: A.S, 4361.1 – 1995. Guide to Lead Paint Management. Part I Industrial Applications.