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constitute the smallest quantities in the waste stream among the recyclable paper types but can bring the highest prices. However, without sophisticated MRFs, source separation is the only way to get significant quantities of uncontaminated high-grade paper out of the waste stream, and large office complexes and schools are the most effective places to establish high-grade paper collection programs. Newsprint is a significant contributor to the residential waste stream and can be collected in those communities with curbside recycling programs, drop-off centers or buy-back programs which accept newsprint. Markets fluctuate very widely for this type of material. The market for mixed paper is also soft. An educational program would be necessary to make the public aware of what is acceptable for recycling, if mixed paper is to be targeted for source separated recycling. There are many contaminants which can make the paper unacceptable, and few collectors accept mixed paper at the current low market prices. Plastic resins can be recycled many times over, however, recycling of plastics is relatively new and processors need to be encouraged to locate in the area. Labor and transportation costs are major deterrents to increased plastics recycling. It will take time for the recycling levels of plastics to achieve the levels of the alternative packaging materials, paper and metals. Currently PET, HDPE, and foam containers have California markets but only PET is being recycled in significant amounts due to the California redemption program. Glass containers can be recycled and there is a processing plant in San Joaquin County, but the material must have negligible contamination to be accepted and must be carefully color sorted to bring the best prices. Loads contaminated with ceramic materials, stones, dirt, Chapter 2 - Waste Generation 19