Essentially, as part of the environmental impact statement the proponent would prepare, they commit themselves to a series of measures. While the impact statement is being reviewed by expert departments, they may suggest additional measures, and those would be agreed to by the proponent. At the end of the process, there may be additional measures identified that are necessary to reduce impacts to non-significant levels, and those would be, again, communicated to the proponent. The expectation would be that the proponent would be implementing those measures.
On October 5th, 2011. See this statement in context.