Most yards don't worry about a little bit of plastic's and you can throw some of that in with you lite iron loads. I wouldn't go crazy, but if you have 10% would be fine it all gets ground up and shipped out and rubber and plastic go to land fills for covering then they put sand over that, and the land fills pay for the covering they call ... Fluff....works good for holding the methane in the ground that they sell to the gas company's so there is money in everything we recycle