Summary of feedstock conversion project in which the California Integrated Waste Management Board aims to encourage existing manufacturers to convert a portion of their current raw material feedstock needs to recycled rubber. This effort is part of a broader strategy to strengthen scrap tire markets and achieve the Board's goal of a 90 percent scrap tire diversion rate by 2012. The report includes a summary of outreach efforts, description of feedstock conversions in rubber and plastic industries, an assessment of the opportunities and barriers to convert feedstock, and recommendations and conclusions.