Until 1984, Croton Landfill was the dumping site of much of Westchester County's garbage and solid waste. Capped in 1995 and equipped with a gas-conversion system, today, the 125-acre inactive Class II hazardous waste landfill converts the methane gas produced at the landfill into a electricity and compressed natural gas. With an estimated initial Landfill Gas flow of 1.4 million cubic feet per day and a methane content of about 50%, the landfill gas is a valuable energy source that Westchester officials decided to use to the County's benefit. Savin Engineers assisted the County in achieving this through design services and the installation of 110 gas extraction wells and a gas collection system. Savin Engineers provided design and construction management for this project, including an electrical power generation facility and a pilot-scale compressed natural gas (CNG) facility. The CNG pilot facility utilized innovative technology to purify the landfill gas to pipeline quality natural gas, which can then be sold to gas utilities or used as a fuel to operate CNG vehicles. The CNG pilot facility processed approximately 100,000 cubic feet per day and operated for two years. It is estimated that the electricity produced from the methane gas-to-electricity facility that will be used at the adjacent Croton Park facilities, and the revenue from the sale of the electricity and natural gas, will result in savings and net earnings estimated at 419 million during the 35-year life of the program.