Nothing in this Title shall preclude the County from requiring the applicant to mitigate adverse environmental impacts of a specific development pursuant to the State Environmental Policy Act, Chapter 43.21C RCW, based on the environmental documents accompanying the underlying development approval process, and/or Chapter 58.17 RCW governing plats and subdivisions; provided, that, the exercise of this authority is consistent with the provisions of Chapter 43.21C RCW and Chapter 82.02 RCW.