The 507-acre Lowry Landfill is located in Arapahoe County, two miles east of Aurora, Colorado. From the mid-1960s until 1980, the city and county of Denver operated the landfill, which accepted industrial and municipal solid waste. These wastes included industrial degreasers, paint, pesticides, hospital and veterinary waste, metal-plating waste, petroleum products, sewage sludge, tires, and household waste. Landfilling operations contaminated soil, groundwater, surface water and sediment with hazardous chemicals. Additionally, gases from buried wastes contaminated the air spaces in subsurface soil. Following cleanup, operation and maintenance activities are ongoing.