This post is a joke right. A yard pays you for having not enough iron content in the material you are selling to them. They are already making a killing off you being a peddler and not an industrial customer. Further more if they are shipping it off to another shredder and not even shredding the material in house why would they care about how much plastic or foam is in the load it doesn't weight anything compared to the amount of steel in it. Put it in with the rest of the shredd and ship it off. Why do you think shredd is the lowest grade material you can sell to a yard besides turnings and borings.