I will need the Project Erik - on the face of it I would agree that the West Number is right but the East number of 36k CY is 2x what you get from 1003890.6 x .5 / 27 so somehow this is being ~ double counted - I would have to see the data to understand why that is - if you can share the project with me I will get the team to take a look (good timing as there is a patch on the starting blocks currently and if it is a defect rather than a data issue we can hopefully get this addressed
My email is alan_sharp@trimble.com
What version are you running?
Alan