The Auckland Council has made us aware of many good technical reports at
In particular they recommend the following are relevant to Meola Creek situation.
P378 – Aromatic Hydrocarbons in Auckland’s aquatic environment
TR2008/023 – Urban sources of copper, lead and zinc
TR2008/028 – Literature review of organic chemicals of emerging environmental concern in use in Auckland
TR2008/029 – The impact of urban stormwater in Auckland’s aquatic receiving environment contaminants
TR2009/111 – The impacts of stormwater in Auckland’s aquatic receiving environment – a review of information 2005-2008