1.The Controlled Bioreactor Landfill Program.Our controlled bioreactor landfilling approach consists of a sequence of (a) filling waste (b) covering with low permeability surface over conductive layer to allow high-efficiency gas capture followed by (c) enhancement of methane generation and capture until generation is completed.Planning for the Institute for Environmental Management (IEM) and Yolo Countys Controlled Bioreactor Landfill Program was begun by IEM in 1989.With field operations beginning in 1994, this has been the worlds longest running bioreactor landfill trial.It is among the best instrumented and documented trials.Major goals of our program and approach have included maximizing gross and net landfill gas energy from landfilled waste, and minimizing total life cycle atmospheric methane emissions per unit of landfilled waste.The goal has been to use approaches that would be feasible worldwide 2.Results.This approach is demonstrating greatly accelerated completion of LFG recovery to maximum yield when compared to "conventional" landfill practice.The findings include over fivefold acceleration of solids conversion to recovered gas.Performance is indicated by: (1) sensors;(2) methane recovery;(3) landfill cores;and (4) other indicators including rapid volume reduction.Capture of the much more rapidly generated landfill gas is estimated via surface scans and other indicators at well over 90%.3.Our Presentation.The team of IEM, Inc and Yolo County, California has developed a large body of unique experience from working on the controlled landfill since project initiation.Our presentation will cover principles, construction, and operational results since fullscale field operations began over 18 years ago.Our results will be presented along with current status of the technology in the US.This presentation wills overview operational and regulatory aspects important to any landfill considering controlled landfill approach.