A major PP compounder saved its pellet plastic floor sweeps until they had a full 40,000 lb. load. They stored the plastic pellet floor sweeps in gaylord boxes with liners. The polypropylene pellet material was contaminated with talc, sweeping compound, sand, rocks, fiberglass, grease, and tramp metal hardware pieces. The compounder contacted US Plastics Recovery regarding the disposition of this material. USPR asked for samples for testing.