The Pasila railway yard was expanded to Ilmala in the 1960s following the closing of the landfill site located there. Approximately 10 million cubic metres of mainly household waste had been taken to the site over 15 years. As was common in those days, industrial and hazardous waste was also taken to the landfill in addition to municipal waste. The railway yard was grounded without an insulating layer directly on top of the levelled-out landfill site. The procedure was in compliance with the then-current building regulations. Rain and drainage water were led to the nearby Kumpula creek, along which they flowed through the Vallila allotment garden area to the Vanhakaupunginlahti bay. Read more