No, that's impossible. The environmental assessment process is a planning document. There are a lot of other licensing and permitting activities that are ongoing after an environmental assessment is done. There is no lessening of standards, because you would be non-compliant with your licence and would have your licence revoked. So I don't see that.
I also don't subscribe to the theory that you can't have development and responsible environmental stewardship. They aren't mutually exclusive.