In the northern tier we do not have access to the I states CSR ratings for our soils. We have a PI index that is typically supplied by Surety (at least that is where I have seen it). I do not believe that the PI we have access to is accurate, is there a way to cross reference the two or just get CSR rating for the soils in our area? When I refer to Northern tier I am referring to soils north of Fargo ND |