sentences:  Cleanup efforts are anticipated to be difficult as there are no roads and the river is too shallow for boats and barges.Former deputy head of Rosprirodnadzor Oleg Mitvol estimated the clean-up cost would be about 100 billion roubles (US$1.5 billion) and take five to 10 years.The Russian-owned Norilsk Nickel refinery in Harjavalta western Finland released 66,000 kg nickel in the local Kokemäenjoki (Kokemäki River) in July 2014.