migrate data with globalize3

gistfile1.rb

#Suppose I have added the new translation columns and set in the CriterionMaterial to translate audit_result and auditor_name
#EG: in the migration:
add_column :criterion_material_translations, :audit_result, :text
add_column :criterion_material_translations, :auditor_name, :string
#now to migrate old columns to new columns...
CriterionMaterial.all.each do |k|
  Globalize.with_locale :"en-US" do
    k.audit_result = #what to put here?
  end
end

#problems: 
k.audit_result #this will not access the old column, it will access the new column in the criterion_material_translations table

#How to access the old column in order to migrate the data?