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4 Petroleum Underground Storage Tanks

The reporting requirements outlined in Chapter 3 are not necessarily appropriate for reports prepared following the removal of petroleum underground storage tanks. Therefore this chapter gives a checklist to be completed following the removal of underground storage tanks. The checklist has been amended from an original developed by URS (NZ) Ltd, Wellington.

The purpose of the checklist is to ensure consistent and thorough reporting of the removal of underground storage tanks in New Zealand, and is for works and investigations generally in accordance with the following nationally accepted documents:

  • Guidelines for Assessing and Managing Petroleum Hydrocarbon Contaminated Sites in New Zealand (Revised 2011) (Ministry for the Environment, 1999)
  • Code of Practice for the Design, Installation, and Operation of Underground Petroleum Storage Systems (Department of Labour, 1992).

The checklist provides the minimum information required to be provided to regional councils or unitary authorities when underground storage tanks are removed or replaced for Tier 1 investigations. If hydrocarbon impact on groundwater is detected and/or where soil remaining on-site exceeds appropriate Tier 1 soil acceptance criteria, a Tier 2 investigation should be undertaken in accordance with the Ministry for the Environment's Guidelines for Assessing and Managing Petroleum Hydrocarbon Contaminated Sites in New Zealand(Revised 2011) (Ministry for the Environment, 1999) and should be reported in accordance with this guideline.

This checklist is also available electronically.

It is not appropriate for this checklist to be used in place of a full site investigation should there be, or have been, other activities or land uses on the site that could cause contamination. It is only intended to be used following the decommissioning of (an) underground storage tank(s) and associated systems (lines, bowsers, fill points, etc). Where there are other potential sources of contamination, a full investigation in accordance with Chapters 2 and 3 of these guidelines should be undertaken.