In the Environmental Accidents and Remediation link in the Extra-financial statements supplement of the Annual Integrated Report 2017 reports on the policies and programs implemented to treat soil and groundwater contamination.
Interesting. Also reports a number of medium-severity incidents, and of those, a number with "operating permit exceedance"
I didn't change the value by the way, but did change the source, it had been citing a pdf version of the web page that didn't convert well.