The C.3 and C.6 Development Review Checklist Captures a formal calculation of existing, new and replaced impervious surface at the project site. The completed form is required for all projects requiring a Planning or Building permit that result in over 1,000 square feet of inpervious surface and is required to be submitted at the time of permit application. If the project involves the development if more than one property at a time within properties owned by a common property owner one form shall be completed for all properties involved in development.