After what just 2 years? I saw a post about it on Facebook, but the link wasn't in English so...
Here it is Kevin.....Tierp Arena i konkurs - Startsidan - UNT.se
Long story but I doubt there is another concrete track surface on the globe built like the one at Tierp Arena. Consider the extremes in temperatures over a year in the area. My father was a "non-race-fan" civil engineer but both the technology of getting the construction done and the concrete setup made his trade news big time. It's not like you can just pour'n forget up here.