Biomethane from Dairy Waste: A Sourcebook for the Production and Use of Renewable Natural Gas in California. Prepared for Western United Dairymen–Michael Marsh, Chief Executive Officer. Research Manager: Ken Krich. Authors: Ken Krich, Don Augenstein, JP Batmale, John Benemann, Brad Rutledge, Dara Salour. Funded in part through USDA Rural Development, July 2005