A refiner wanted to change their crude slate and the method of delivery of the crude. They wanted to implement the changes as soon as possible, and needed a way to quickly evaluate whether the changes would require an air permit. Unfortunately, the standard way to evaluate the impact to air emissions required the use of a proprietary model used by the refinery; the refinery had a very small number of in-house staff qualified to run the model. Because of the model’s proprietary nature they could not outsource its use. The lack of in-house modeling capability was a bottleneck in their efforts to quickly implement the changes to the crude slate and delivery. They needed a quick and non-proprietary alternative method to evaluate air emission permitting impacts.