In cases where the Part 1 scoping has identified EALIs as potentially important or significant, in Part 2 it will be necessary to identify and quantify the impacts. As a practical approach to identifying and quantifying EALIs (at least in orders of magnitude), it is necessary to consider the nature and scale of these impacts on a case by case basis. Such an approach was recommended by SACTRA for all but the largest options, for which a more comprehensive approach involving formal modelling might be more appropriate.